Merge branch 'tr/notes-display'

* tr/notes-display:
  git-notes(1): add a section about the meaning of history
  notes: track whether notes_trees were changed at all
  notes: add shorthand --ref to override GIT_NOTES_REF
  commit --amend: copy notes to the new commit
  rebase: support automatic notes copying
  notes: implement helpers needed for note copying during rewrite
  notes: implement 'git notes copy --stdin'
  rebase -i: invoke post-rewrite hook
  rebase: invoke post-rewrite hook
  commit --amend: invoke post-rewrite hook
  Documentation: document post-rewrite hook
  Support showing notes from more than one notes tree
  test-lib: unset GIT_NOTES_REF to stop it from influencing tests

Conflicts:
	git-am.sh
	refs.c

diff --cc Documentation/config.txt
Simple merge

diff --cc Documentation/git-notes.txt
index bef2f3942e0540a4829a30f39c88d3414046d7d1,e2701cff1af034fbc1794f8e4b42458b67a47f92..4e5113b837230c8f050cf4bbe10e8de4b3271bd0
--- 1/Documentation/git-notes.txt
--- 2/Documentation/git-notes.txt
+++ b/Documentation/git-notes.txt
@@@ -52,9 -57,19 +57,19 @@@ add:
  copy::
        Copy the notes for the first object onto the second object.
        Abort if the second object already has notes, or if the first
 -      objects has none. (use -f to overwrite existing notes to the
 +      object has none (use -f to overwrite existing notes to the
        second object). This subcommand is equivalent to:
        `git notes add [-f] -C $(git notes list <from-object>) <to-object>`
+ +
+ In `\--stdin` mode, take lines in the format
+ +
+ ----------
+ <from-object> SP <to-object> [ SP <rest> ] LF
+ ----------
+ +
+ on standard input, and copy the notes from each <from-object> to its
+ corresponding <to-object>.  (The optional `<rest>` is ignored so that
+ the command can read the input given to the `post-rewrite` hook.)
  
  append::
        Append to the notes of an existing object (defaults to HEAD).

diff --cc builtin/commit.c
index f4c73442cfba9483a826dcfbf68f5466d43e8351,0000000000000000000000000000000000000000..8dd104ee0b247f5536d02d54a932acfcbaec603b
mode 100644,000000..100644
--- 1/builtin/commit.c
--- /dev/null
+++ b/builtin/commit.c
@@@ -1,1310 -1,0 +1,1355 @@@
 +/*
 + * Builtin "git commit"
 + *
 + * Copyright (c) 2007 Kristian Høgsberg <krh@redhat.com>
 + * Based on git-commit.sh by Junio C Hamano and Linus Torvalds
 + */
 +
 +#include "cache.h"
 +#include "cache-tree.h"
 +#include "color.h"
 +#include "dir.h"
 +#include "builtin.h"
 +#include "diff.h"
 +#include "diffcore.h"
 +#include "commit.h"
 +#include "revision.h"
 +#include "wt-status.h"
 +#include "run-command.h"
 +#include "refs.h"
 +#include "log-tree.h"
 +#include "strbuf.h"
 +#include "utf8.h"
 +#include "parse-options.h"
 +#include "string-list.h"
 +#include "rerere.h"
 +#include "unpack-trees.h"
 +#include "quote.h"
 +
 +static const char * const builtin_commit_usage[] = {
 +      "git commit [options] [--] <filepattern>...",
 +      NULL
 +};
 +
 +static const char * const builtin_status_usage[] = {
 +      "git status [options] [--] <filepattern>...",
 +      NULL
 +};
 +
 +static const char implicit_ident_advice[] =
 +"Your name and email address were configured automatically based\n"
 +"on your username and hostname. Please check that they are accurate.\n"
 +"You can suppress this message by setting them explicitly:\n"
 +"\n"
 +"    git config --global user.name \"Your Name\"\n"
 +"    git config --global user.email you@example.com\n"
 +"\n"
 +"If the identity used for this commit is wrong, you can fix it with:\n"
 +"\n"
 +"    git commit --amend --author='Your Name <you@example.com>'\n";
 +
 +static unsigned char head_sha1[20];
 +
 +static char *use_message_buffer;
 +static const char commit_editmsg[] = "COMMIT_EDITMSG";
 +static struct lock_file index_lock; /* real index */
 +static struct lock_file false_lock; /* used only for partial commits */
 +static enum {
 +      COMMIT_AS_IS = 1,
 +      COMMIT_NORMAL,
 +      COMMIT_PARTIAL,
 +} commit_style;
 +
 +static const char *logfile, *force_author;
 +static const char *template_file;
 +static char *edit_message, *use_message;
 +static char *author_name, *author_email, *author_date;
 +static int all, edit_flag, also, interactive, only, amend, signoff;
 +static int quiet, verbose, no_verify, allow_empty, dry_run, renew_authorship;
++static int no_post_rewrite;
 +static char *untracked_files_arg, *force_date;
 +/*
 + * The default commit message cleanup mode will remove the lines
 + * beginning with # (shell comments) and leading and trailing
 + * whitespaces (empty lines or containing only whitespaces)
 + * if editor is used, and only the whitespaces if the message
 + * is specified explicitly.
 + */
 +static enum {
 +      CLEANUP_SPACE,
 +      CLEANUP_NONE,
 +      CLEANUP_ALL,
 +} cleanup_mode;
 +static char *cleanup_arg;
 +
 +static int use_editor = 1, initial_commit, in_merge, include_status = 1;
 +static const char *only_include_assumed;
 +static struct strbuf message;
 +
 +static int null_termination;
 +static enum {
 +      STATUS_FORMAT_LONG,
 +      STATUS_FORMAT_SHORT,
 +      STATUS_FORMAT_PORCELAIN,
 +} status_format = STATUS_FORMAT_LONG;
 +
 +static int opt_parse_m(const struct option *opt, const char *arg, int unset)
 +{
 +      struct strbuf *buf = opt->value;
 +      if (unset)
 +              strbuf_setlen(buf, 0);
 +      else {
 +              strbuf_addstr(buf, arg);
 +              strbuf_addstr(buf, "\n\n");
 +      }
 +      return 0;
 +}
 +
 +static struct option builtin_commit_options[] = {
 +      OPT__QUIET(&quiet),
 +      OPT__VERBOSE(&verbose),
 +
 +      OPT_GROUP("Commit message options"),
 +      OPT_FILENAME('F', "file", &logfile, "read log from file"),
 +      OPT_STRING(0, "author", &force_author, "AUTHOR", "override author for commit"),
 +      OPT_STRING(0, "date", &force_date, "DATE", "override date for commit"),
 +      OPT_CALLBACK('m', "message", &message, "MESSAGE", "specify commit message", opt_parse_m),
 +      OPT_STRING('c', "reedit-message", &edit_message, "COMMIT", "reuse and edit message from specified commit"),
 +      OPT_STRING('C', "reuse-message", &use_message, "COMMIT", "reuse message from specified commit"),
 +      OPT_BOOLEAN(0, "reset-author", &renew_authorship, "the commit is authored by me now (used with -C-c/--amend)"),
 +      OPT_BOOLEAN('s', "signoff", &signoff, "add Signed-off-by:"),
 +      OPT_FILENAME('t', "template", &template_file, "use specified template file"),
 +      OPT_BOOLEAN('e', "edit", &edit_flag, "force edit of commit"),
 +      OPT_STRING(0, "cleanup", &cleanup_arg, "default", "how to strip spaces and #comments from message"),
 +      OPT_BOOLEAN(0, "status", &include_status, "include status in commit message template"),
 +      /* end commit message options */
 +
 +      OPT_GROUP("Commit contents options"),
 +      OPT_BOOLEAN('a', "all", &all, "commit all changed files"),
 +      OPT_BOOLEAN('i', "include", &also, "add specified files to index for commit"),
 +      OPT_BOOLEAN(0, "interactive", &interactive, "interactively add files"),
 +      OPT_BOOLEAN('o', "only", &only, "commit only specified files"),
 +      OPT_BOOLEAN('n', "no-verify", &no_verify, "bypass pre-commit hook"),
 +      OPT_BOOLEAN(0, "dry-run", &dry_run, "show what would be committed"),
 +      OPT_SET_INT(0, "short", &status_format, "show status concisely",
 +                  STATUS_FORMAT_SHORT),
 +      OPT_SET_INT(0, "porcelain", &status_format,
 +                  "show porcelain output format", STATUS_FORMAT_PORCELAIN),
 +      OPT_BOOLEAN('z', "null", &null_termination,
 +                  "terminate entries with NUL"),
 +      OPT_BOOLEAN(0, "amend", &amend, "amend previous commit"),
++      OPT_BOOLEAN(0, "no-post-rewrite", &no_post_rewrite, "bypass post-rewrite hook"),
 +      { OPTION_STRING, 'u', "untracked-files", &untracked_files_arg, "mode", "show untracked files, optional modes: all, normal, no. (Default: all)", PARSE_OPT_OPTARG, NULL, (intptr_t)"all" },
 +      OPT_BOOLEAN(0, "allow-empty", &allow_empty, "ok to record an empty change"),
 +      /* end commit contents options */
 +
 +      OPT_END()
 +};
 +
 +static void rollback_index_files(void)
 +{
 +      switch (commit_style) {
 +      case COMMIT_AS_IS:
 +              break; /* nothing to do */
 +      case COMMIT_NORMAL:
 +              rollback_lock_file(&index_lock);
 +              break;
 +      case COMMIT_PARTIAL:
 +              rollback_lock_file(&index_lock);
 +              rollback_lock_file(&false_lock);
 +              break;
 +      }
 +}
 +
 +static int commit_index_files(void)
 +{
 +      int err = 0;
 +
 +      switch (commit_style) {
 +      case COMMIT_AS_IS:
 +              break; /* nothing to do */
 +      case COMMIT_NORMAL:
 +              err = commit_lock_file(&index_lock);
 +              break;
 +      case COMMIT_PARTIAL:
 +              err = commit_lock_file(&index_lock);
 +              rollback_lock_file(&false_lock);
 +              break;
 +      }
 +
 +      return err;
 +}
 +
 +/*
 + * Take a union of paths in the index and the named tree (typically, "HEAD"),
 + * and return the paths that match the given pattern in list.
 + */
 +static int list_paths(struct string_list *list, const char *with_tree,
 +                    const char *prefix, const char **pattern)
 +{
 +      int i;
 +      char *m;
 +
 +      for (i = 0; pattern[i]; i++)
 +              ;
 +      m = xcalloc(1, i);
 +
 +      if (with_tree)
 +              overlay_tree_on_cache(with_tree, prefix);
 +
 +      for (i = 0; i < active_nr; i++) {
 +              struct cache_entry *ce = active_cache[i];
 +              struct string_list_item *item;
 +
 +              if (ce->ce_flags & CE_UPDATE)
 +                      continue;
 +              if (!match_pathspec(pattern, ce->name, ce_namelen(ce), 0, m))
 +                      continue;
 +              item = string_list_insert(ce->name, list);
 +              if (ce_skip_worktree(ce))
 +                      item->util = item; /* better a valid pointer than a fake one */
 +      }
 +
 +      return report_path_error(m, pattern, prefix ? strlen(prefix) : 0);
 +}
 +
 +static void add_remove_files(struct string_list *list)
 +{
 +      int i;
 +      for (i = 0; i < list->nr; i++) {
 +              struct stat st;
 +              struct string_list_item *p = &(list->items[i]);
 +
 +              /* p->util is skip-worktree */
 +              if (p->util)
 +                      continue;
 +
 +              if (!lstat(p->string, &st)) {
 +                      if (add_to_cache(p->string, &st, 0))
 +                              die("updating files failed");
 +              } else
 +                      remove_file_from_cache(p->string);
 +      }
 +}
 +
 +static void create_base_index(void)
 +{
 +      struct tree *tree;
 +      struct unpack_trees_options opts;
 +      struct tree_desc t;
 +
 +      if (initial_commit) {
 +              discard_cache();
 +              return;
 +      }
 +
 +      memset(&opts, 0, sizeof(opts));
 +      opts.head_idx = 1;
 +      opts.index_only = 1;
 +      opts.merge = 1;
 +      opts.src_index = &the_index;
 +      opts.dst_index = &the_index;
 +
 +      opts.fn = oneway_merge;
 +      tree = parse_tree_indirect(head_sha1);
 +      if (!tree)
 +              die("failed to unpack HEAD tree object");
 +      parse_tree(tree);
 +      init_tree_desc(&t, tree->buffer, tree->size);
 +      if (unpack_trees(1, &t, &opts))
 +              exit(128); /* We've already reported the error, finish dying */
 +}
 +
 +static void refresh_cache_or_die(int refresh_flags)
 +{
 +      /*
 +       * refresh_flags contains REFRESH_QUIET, so the only errors
 +       * are for unmerged entries.
 +       */
 +      if (refresh_cache(refresh_flags | REFRESH_IN_PORCELAIN))
 +              die_resolve_conflict("commit");
 +}
 +
 +static char *prepare_index(int argc, const char **argv, const char *prefix, int is_status)
 +{
 +      int fd;
 +      struct string_list partial;
 +      const char **pathspec = NULL;
 +      int refresh_flags = REFRESH_QUIET;
 +
 +      if (is_status)
 +              refresh_flags |= REFRESH_UNMERGED;
 +      if (interactive) {
 +              if (interactive_add(argc, argv, prefix) != 0)
 +                      die("interactive add failed");
 +              if (read_cache_preload(NULL) < 0)
 +                      die("index file corrupt");
 +              commit_style = COMMIT_AS_IS;
 +              return get_index_file();
 +      }
 +
 +      if (*argv)
 +              pathspec = get_pathspec(prefix, argv);
 +
 +      if (read_cache_preload(pathspec) < 0)
 +              die("index file corrupt");
 +
 +      /*
 +       * Non partial, non as-is commit.
 +       *
 +       * (1) get the real index;
 +       * (2) update the_index as necessary;
 +       * (3) write the_index out to the real index (still locked);
 +       * (4) return the name of the locked index file.
 +       *
 +       * The caller should run hooks on the locked real index, and
 +       * (A) if all goes well, commit the real index;
 +       * (B) on failure, rollback the real index.
 +       */
 +      if (all || (also && pathspec && *pathspec)) {
 +              int fd = hold_locked_index(&index_lock, 1);
 +              add_files_to_cache(also ? prefix : NULL, pathspec, 0);
 +              refresh_cache_or_die(refresh_flags);
 +              if (write_cache(fd, active_cache, active_nr) ||
 +                  close_lock_file(&index_lock))
 +                      die("unable to write new_index file");
 +              commit_style = COMMIT_NORMAL;
 +              return index_lock.filename;
 +      }
 +
 +      /*
 +       * As-is commit.
 +       *
 +       * (1) return the name of the real index file.
 +       *
 +       * The caller should run hooks on the real index, and run
 +       * hooks on the real index, and create commit from the_index.
 +       * We still need to refresh the index here.
 +       */
 +      if (!pathspec || !*pathspec) {
 +              fd = hold_locked_index(&index_lock, 1);
 +              refresh_cache_or_die(refresh_flags);
 +              if (write_cache(fd, active_cache, active_nr) ||
 +                  commit_locked_index(&index_lock))
 +                      die("unable to write new_index file");
 +              commit_style = COMMIT_AS_IS;
 +              return get_index_file();
 +      }
 +
 +      /*
 +       * A partial commit.
 +       *
 +       * (0) find the set of affected paths;
 +       * (1) get lock on the real index file;
 +       * (2) update the_index with the given paths;
 +       * (3) write the_index out to the real index (still locked);
 +       * (4) get lock on the false index file;
 +       * (5) reset the_index from HEAD;
 +       * (6) update the_index the same way as (2);
 +       * (7) write the_index out to the false index file;
 +       * (8) return the name of the false index file (still locked);
 +       *
 +       * The caller should run hooks on the locked false index, and
 +       * create commit from it.  Then
 +       * (A) if all goes well, commit the real index;
 +       * (B) on failure, rollback the real index;
 +       * In either case, rollback the false index.
 +       */
 +      commit_style = COMMIT_PARTIAL;
 +
 +      if (in_merge)
 +              die("cannot do a partial commit during a merge.");
 +
 +      memset(&partial, 0, sizeof(partial));
 +      partial.strdup_strings = 1;
 +      if (list_paths(&partial, initial_commit ? NULL : "HEAD", prefix, pathspec))
 +              exit(1);
 +
 +      discard_cache();
 +      if (read_cache() < 0)
 +              die("cannot read the index");
 +
 +      fd = hold_locked_index(&index_lock, 1);
 +      add_remove_files(&partial);
 +      refresh_cache(REFRESH_QUIET);
 +      if (write_cache(fd, active_cache, active_nr) ||
 +          close_lock_file(&index_lock))
 +              die("unable to write new_index file");
 +
 +      fd = hold_lock_file_for_update(&false_lock,
 +                                     git_path("next-index-%"PRIuMAX,
 +                                              (uintmax_t) getpid()),
 +                                     LOCK_DIE_ON_ERROR);
 +
 +      create_base_index();
 +      add_remove_files(&partial);
 +      refresh_cache(REFRESH_QUIET);
 +
 +      if (write_cache(fd, active_cache, active_nr) ||
 +          close_lock_file(&false_lock))
 +              die("unable to write temporary index file");
 +
 +      discard_cache();
 +      read_cache_from(false_lock.filename);
 +
 +      return false_lock.filename;
 +}
 +
 +static int run_status(FILE *fp, const char *index_file, const char *prefix, int nowarn,
 +                    struct wt_status *s)
 +{
 +      unsigned char sha1[20];
 +
 +      if (s->relative_paths)
 +              s->prefix = prefix;
 +
 +      if (amend) {
 +              s->amend = 1;
 +              s->reference = "HEAD^1";
 +      }
 +      s->verbose = verbose;
 +      s->index_file = index_file;
 +      s->fp = fp;
 +      s->nowarn = nowarn;
 +      s->is_initial = get_sha1(s->reference, sha1) ? 1 : 0;
 +
 +      wt_status_collect(s);
 +
 +      switch (status_format) {
 +      case STATUS_FORMAT_SHORT:
 +              wt_shortstatus_print(s, null_termination);
 +              break;
 +      case STATUS_FORMAT_PORCELAIN:
 +              wt_porcelain_print(s, null_termination);
 +              break;
 +      case STATUS_FORMAT_LONG:
 +              wt_status_print(s);
 +              break;
 +      }
 +
 +      return s->commitable;
 +}
 +
 +static int is_a_merge(const unsigned char *sha1)
 +{
 +      struct commit *commit = lookup_commit(sha1);
 +      if (!commit || parse_commit(commit))
 +              die("could not parse HEAD commit");
 +      return !!(commit->parents && commit->parents->next);
 +}
 +
 +static const char sign_off_header[] = "Signed-off-by: ";
 +
 +static void determine_author_info(void)
 +{
 +      char *name, *email, *date;
 +
 +      name = getenv("GIT_AUTHOR_NAME");
 +      email = getenv("GIT_AUTHOR_EMAIL");
 +      date = getenv("GIT_AUTHOR_DATE");
 +
 +      if (use_message && !renew_authorship) {
 +              const char *a, *lb, *rb, *eol;
 +
 +              a = strstr(use_message_buffer, "\nauthor ");
 +              if (!a)
 +                      die("invalid commit: %s", use_message);
 +
 +              lb = strstr(a + 8, " <");
 +              rb = strstr(a + 8, "> ");
 +              eol = strchr(a + 8, '\n');
 +              if (!lb || !rb || !eol)
 +                      die("invalid commit: %s", use_message);
 +
 +              name = xstrndup(a + 8, lb - (a + 8));
 +              email = xstrndup(lb + 2, rb - (lb + 2));
 +              date = xstrndup(rb + 2, eol - (rb + 2));
 +      }
 +
 +      if (force_author) {
 +              const char *lb = strstr(force_author, " <");
 +              const char *rb = strchr(force_author, '>');
 +
 +              if (!lb || !rb)
 +                      die("malformed --author parameter");
 +              name = xstrndup(force_author, lb - force_author);
 +              email = xstrndup(lb + 2, rb - (lb + 2));
 +      }
 +
 +      if (force_date)
 +              date = force_date;
 +
 +      author_name = name;
 +      author_email = email;
 +      author_date = date;
 +}
 +
 +static int ends_rfc2822_footer(struct strbuf *sb)
 +{
 +      int ch;
 +      int hit = 0;
 +      int i, j, k;
 +      int len = sb->len;
 +      int first = 1;
 +      const char *buf = sb->buf;
 +
 +      for (i = len - 1; i > 0; i--) {
 +              if (hit && buf[i] == '\n')
 +                      break;
 +              hit = (buf[i] == '\n');
 +      }
 +
 +      while (i < len - 1 && buf[i] == '\n')
 +              i++;
 +
 +      for (; i < len; i = k) {
 +              for (k = i; k < len && buf[k] != '\n'; k++)
 +                      ; /* do nothing */
 +              k++;
 +
 +              if ((buf[k] == ' ' || buf[k] == '\t') && !first)
 +                      continue;
 +
 +              first = 0;
 +
 +              for (j = 0; i + j < len; j++) {
 +                      ch = buf[i + j];
 +                      if (ch == ':')
 +                              break;
 +                      if (isalnum(ch) ||
 +                          (ch == '-'))
 +                              continue;
 +                      return 0;
 +              }
 +      }
 +      return 1;
 +}
 +
 +static int prepare_to_commit(const char *index_file, const char *prefix,
 +                           struct wt_status *s)
 +{
 +      struct stat statbuf;
 +      int commitable, saved_color_setting;
 +      struct strbuf sb = STRBUF_INIT;
 +      char *buffer;
 +      FILE *fp;
 +      const char *hook_arg1 = NULL;
 +      const char *hook_arg2 = NULL;
 +      int ident_shown = 0;
 +
 +      if (!no_verify && run_hook(index_file, "pre-commit", NULL))
 +              return 0;
 +
 +      if (message.len) {
 +              strbuf_addbuf(&sb, &message);
 +              hook_arg1 = "message";
 +      } else if (logfile && !strcmp(logfile, "-")) {
 +              if (isatty(0))
 +                      fprintf(stderr, "(reading log message from standard input)\n");
 +              if (strbuf_read(&sb, 0, 0) < 0)
 +                      die_errno("could not read log from standard input");
 +              hook_arg1 = "message";
 +      } else if (logfile) {
 +              if (strbuf_read_file(&sb, logfile, 0) < 0)
 +                      die_errno("could not read log file '%s'",
 +                                logfile);
 +              hook_arg1 = "message";
 +      } else if (use_message) {
 +              buffer = strstr(use_message_buffer, "\n\n");
 +              if (!buffer || buffer[2] == '\0')
 +                      die("commit has empty message");
 +              strbuf_add(&sb, buffer + 2, strlen(buffer + 2));
 +              hook_arg1 = "commit";
 +              hook_arg2 = use_message;
 +      } else if (!stat(git_path("MERGE_MSG"), &statbuf)) {
 +              if (strbuf_read_file(&sb, git_path("MERGE_MSG"), 0) < 0)
 +                      die_errno("could not read MERGE_MSG");
 +              hook_arg1 = "merge";
 +      } else if (!stat(git_path("SQUASH_MSG"), &statbuf)) {
 +              if (strbuf_read_file(&sb, git_path("SQUASH_MSG"), 0) < 0)
 +                      die_errno("could not read SQUASH_MSG");
 +              hook_arg1 = "squash";
 +      } else if (template_file && !stat(template_file, &statbuf)) {
 +              if (strbuf_read_file(&sb, template_file, 0) < 0)
 +                      die_errno("could not read '%s'", template_file);
 +              hook_arg1 = "template";
 +      }
 +
 +      /*
 +       * This final case does not modify the template message,
 +       * it just sets the argument to the prepare-commit-msg hook.
 +       */
 +      else if (in_merge)
 +              hook_arg1 = "merge";
 +
 +      fp = fopen(git_path(commit_editmsg), "w");
 +      if (fp == NULL)
 +              die_errno("could not open '%s'", git_path(commit_editmsg));
 +
 +      if (cleanup_mode != CLEANUP_NONE)
 +              stripspace(&sb, 0);
 +
 +      if (signoff) {
 +              struct strbuf sob = STRBUF_INIT;
 +              int i;
 +
 +              strbuf_addstr(&sob, sign_off_header);
 +              strbuf_addstr(&sob, fmt_name(getenv("GIT_COMMITTER_NAME"),
 +                                           getenv("GIT_COMMITTER_EMAIL")));
 +              strbuf_addch(&sob, '\n');
 +              for (i = sb.len - 1; i > 0 && sb.buf[i - 1] != '\n'; i--)
 +                      ; /* do nothing */
 +              if (prefixcmp(sb.buf + i, sob.buf)) {
 +                      if (!i || !ends_rfc2822_footer(&sb))
 +                              strbuf_addch(&sb, '\n');
 +                      strbuf_addbuf(&sb, &sob);
 +              }
 +              strbuf_release(&sob);
 +      }
 +
 +      if (fwrite(sb.buf, 1, sb.len, fp) < sb.len)
 +              die_errno("could not write commit template");
 +
 +      strbuf_release(&sb);
 +
 +      determine_author_info();
 +
 +      /* This checks if committer ident is explicitly given */
 +      git_committer_info(0);
 +      if (use_editor && include_status) {
 +              char *author_ident;
 +              const char *committer_ident;
 +
 +              if (in_merge)
 +                      fprintf(fp,
 +                              "#\n"
 +                              "# It looks like you may be committing a MERGE.\n"
 +                              "# If this is not correct, please remove the file\n"
 +                              "#      %s\n"
 +                              "# and try again.\n"
 +                              "#\n",
 +                              git_path("MERGE_HEAD"));
 +
 +              fprintf(fp,
 +                      "\n"
 +                      "# Please enter the commit message for your changes.");
 +              if (cleanup_mode == CLEANUP_ALL)
 +                      fprintf(fp,
 +                              " Lines starting\n"
 +                              "# with '#' will be ignored, and an empty"
 +                              " message aborts the commit.\n");
 +              else /* CLEANUP_SPACE, that is. */
 +                      fprintf(fp,
 +                              " Lines starting\n"
 +                              "# with '#' will be kept; you may remove them"
 +                              " yourself if you want to.\n"
 +                              "# An empty message aborts the commit.\n");
 +              if (only_include_assumed)
 +                      fprintf(fp, "# %s\n", only_include_assumed);
 +
 +              author_ident = xstrdup(fmt_name(author_name, author_email));
 +              committer_ident = fmt_name(getenv("GIT_COMMITTER_NAME"),
 +                                         getenv("GIT_COMMITTER_EMAIL"));
 +              if (strcmp(author_ident, committer_ident))
 +                      fprintf(fp,
 +                              "%s"
 +                              "# Author:    %s\n",
 +                              ident_shown++ ? "" : "#\n",
 +                              author_ident);
 +              free(author_ident);
 +
 +              if (!user_ident_sufficiently_given())
 +                      fprintf(fp,
 +                              "%s"
 +                              "# Committer: %s\n",
 +                              ident_shown++ ? "" : "#\n",
 +                              committer_ident);
 +
 +              if (ident_shown)
 +                      fprintf(fp, "#\n");
 +
 +              saved_color_setting = s->use_color;
 +              s->use_color = 0;
 +              commitable = run_status(fp, index_file, prefix, 1, s);
 +              s->use_color = saved_color_setting;
 +      } else {
 +              unsigned char sha1[20];
 +              const char *parent = "HEAD";
 +
 +              if (!active_nr && read_cache() < 0)
 +                      die("Cannot read index");
 +
 +              if (amend)
 +                      parent = "HEAD^1";
 +
 +              if (get_sha1(parent, sha1))
 +                      commitable = !!active_nr;
 +              else
 +                      commitable = index_differs_from(parent, 0);
 +      }
 +
 +      fclose(fp);
 +
 +      if (!commitable && !in_merge && !allow_empty &&
 +          !(amend && is_a_merge(head_sha1))) {
 +              run_status(stdout, index_file, prefix, 0, s);
 +              return 0;
 +      }
 +
 +      /*
 +       * Re-read the index as pre-commit hook could have updated it,
 +       * and write it out as a tree.  We must do this before we invoke
 +       * the editor and after we invoke run_status above.
 +       */
 +      discard_cache();
 +      read_cache_from(index_file);
 +      if (!active_cache_tree)
 +              active_cache_tree = cache_tree();
 +      if (cache_tree_update(active_cache_tree,
 +                            active_cache, active_nr, 0, 0) < 0) {
 +              error("Error building trees");
 +              return 0;
 +      }
 +
 +      if (run_hook(index_file, "prepare-commit-msg",
 +                   git_path(commit_editmsg), hook_arg1, hook_arg2, NULL))
 +              return 0;
 +
 +      if (use_editor) {
 +              char index[PATH_MAX];
 +              const char *env[2] = { index, NULL };
 +              snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file);
 +              if (launch_editor(git_path(commit_editmsg), NULL, env)) {
 +                      fprintf(stderr,
 +                      "Please supply the message using either -m or -F option.\n");
 +                      exit(1);
 +              }
 +      }
 +
 +      if (!no_verify &&
 +          run_hook(index_file, "commit-msg", git_path(commit_editmsg), NULL)) {
 +              return 0;
 +      }
 +
 +      return 1;
 +}
 +
 +/*
 + * Find out if the message in the strbuf contains only whitespace and
 + * Signed-off-by lines.
 + */
 +static int message_is_empty(struct strbuf *sb)
 +{
 +      struct strbuf tmpl = STRBUF_INIT;
 +      const char *nl;
 +      int eol, i, start = 0;
 +
 +      if (cleanup_mode == CLEANUP_NONE && sb->len)
 +              return 0;
 +
 +      /* See if the template is just a prefix of the message. */
 +      if (template_file && strbuf_read_file(&tmpl, template_file, 0) > 0) {
 +              stripspace(&tmpl, cleanup_mode == CLEANUP_ALL);
 +              if (start + tmpl.len <= sb->len &&
 +                  memcmp(tmpl.buf, sb->buf + start, tmpl.len) == 0)
 +                      start += tmpl.len;
 +      }
 +      strbuf_release(&tmpl);
 +
 +      /* Check if the rest is just whitespace and Signed-of-by's. */
 +      for (i = start; i < sb->len; i++) {
 +              nl = memchr(sb->buf + i, '\n', sb->len - i);
 +              if (nl)
 +                      eol = nl - sb->buf;
 +              else
 +                      eol = sb->len;
 +
 +              if (strlen(sign_off_header) <= eol - i &&
 +                  !prefixcmp(sb->buf + i, sign_off_header)) {
 +                      i = eol;
 +                      continue;
 +              }
 +              while (i < eol)
 +                      if (!isspace(sb->buf[i++]))
 +                              return 0;
 +      }
 +
 +      return 1;
 +}
 +
 +static const char *find_author_by_nickname(const char *name)
 +{
 +      struct rev_info revs;
 +      struct commit *commit;
 +      struct strbuf buf = STRBUF_INIT;
 +      const char *av[20];
 +      int ac = 0;
 +
 +      init_revisions(&revs, NULL);
 +      strbuf_addf(&buf, "--author=%s", name);
 +      av[++ac] = "--all";
 +      av[++ac] = "-i";
 +      av[++ac] = buf.buf;
 +      av[++ac] = NULL;
 +      setup_revisions(ac, av, &revs, NULL);
 +      prepare_revision_walk(&revs);
 +      commit = get_revision(&revs);
 +      if (commit) {
 +              struct pretty_print_context ctx = {0};
 +              ctx.date_mode = DATE_NORMAL;
 +              strbuf_release(&buf);
 +              format_commit_message(commit, "%an <%ae>", &buf, &ctx);
 +              return strbuf_detach(&buf, NULL);
 +      }
 +      die("No existing author found with '%s'", name);
 +}
 +
 +
 +static void handle_untracked_files_arg(struct wt_status *s)
 +{
 +      if (!untracked_files_arg)
 +              ; /* default already initialized */
 +      else if (!strcmp(untracked_files_arg, "no"))
 +              s->show_untracked_files = SHOW_NO_UNTRACKED_FILES;
 +      else if (!strcmp(untracked_files_arg, "normal"))
 +              s->show_untracked_files = SHOW_NORMAL_UNTRACKED_FILES;
 +      else if (!strcmp(untracked_files_arg, "all"))
 +              s->show_untracked_files = SHOW_ALL_UNTRACKED_FILES;
 +      else
 +              die("Invalid untracked files mode '%s'", untracked_files_arg);
 +}
 +
 +static int parse_and_validate_options(int argc, const char *argv[],
 +                                    const char * const usage[],
 +                                    const char *prefix,
 +                                    struct wt_status *s)
 +{
 +      int f = 0;
 +
 +      argc = parse_options(argc, argv, prefix, builtin_commit_options, usage,
 +                           0);
 +
 +      if (force_author && !strchr(force_author, '>'))
 +              force_author = find_author_by_nickname(force_author);
 +
 +      if (force_author && renew_authorship)
 +              die("Using both --reset-author and --author does not make sense");
 +
 +      if (logfile || message.len || use_message)
 +              use_editor = 0;
 +      if (edit_flag)
 +              use_editor = 1;
 +      if (!use_editor)
 +              setenv("GIT_EDITOR", ":", 1);
 +
 +      if (get_sha1("HEAD", head_sha1))
 +              initial_commit = 1;
 +
 +      /* Sanity check options */
 +      if (amend && initial_commit)
 +              die("You have nothing to amend.");
 +      if (amend && in_merge)
 +              die("You are in the middle of a merge -- cannot amend.");
 +
 +      if (use_message)
 +              f++;
 +      if (edit_message)
 +              f++;
 +      if (logfile)
 +              f++;
 +      if (f > 1)
 +              die("Only one of -c/-C/-F can be used.");
 +      if (message.len && f > 0)
 +              die("Option -m cannot be combined with -c/-C/-F.");
 +      if (edit_message)
 +              use_message = edit_message;
 +      if (amend && !use_message)
 +              use_message = "HEAD";
 +      if (!use_message && renew_authorship)
 +              die("--reset-author can be used only with -C, -c or --amend.");
 +      if (use_message) {
 +              unsigned char sha1[20];
 +              static char utf8[] = "UTF-8";
 +              const char *out_enc;
 +              char *enc, *end;
 +              struct commit *commit;
 +
 +              if (get_sha1(use_message, sha1))
 +                      die("could not lookup commit %s", use_message);
 +              commit = lookup_commit_reference(sha1);
 +              if (!commit || parse_commit(commit))
 +                      die("could not parse commit %s", use_message);
 +
 +              enc = strstr(commit->buffer, "\nencoding");
 +              if (enc) {
 +                      end = strchr(enc + 10, '\n');
 +                      enc = xstrndup(enc + 10, end - (enc + 10));
 +              } else {
 +                      enc = utf8;
 +              }
 +              out_enc = git_commit_encoding ? git_commit_encoding : utf8;
 +
 +              if (strcmp(out_enc, enc))
 +                      use_message_buffer =
 +                              reencode_string(commit->buffer, out_enc, enc);
 +
 +              /*
 +               * If we failed to reencode the buffer, just copy it
 +               * byte for byte so the user can try to fix it up.
 +               * This also handles the case where input and output
 +               * encodings are identical.
 +               */
 +              if (use_message_buffer == NULL)
 +                      use_message_buffer = xstrdup(commit->buffer);
 +              if (enc != utf8)
 +                      free(enc);
 +      }
 +
 +      if (!!also + !!only + !!all + !!interactive > 1)
 +              die("Only one of --include/--only/--all/--interactive can be used.");
 +      if (argc == 0 && (also || (only && !amend)))
 +              die("No paths with --include/--only does not make sense.");
 +      if (argc == 0 && only && amend)
 +              only_include_assumed = "Clever... amending the last one with dirty index.";
 +      if (argc > 0 && !also && !only)
 +              only_include_assumed = "Explicit paths specified without -i nor -o; assuming --only paths...";
 +      if (!cleanup_arg || !strcmp(cleanup_arg, "default"))
 +              cleanup_mode = use_editor ? CLEANUP_ALL : CLEANUP_SPACE;
 +      else if (!strcmp(cleanup_arg, "verbatim"))
 +              cleanup_mode = CLEANUP_NONE;
 +      else if (!strcmp(cleanup_arg, "whitespace"))
 +              cleanup_mode = CLEANUP_SPACE;
 +      else if (!strcmp(cleanup_arg, "strip"))
 +              cleanup_mode = CLEANUP_ALL;
 +      else
 +              die("Invalid cleanup mode %s", cleanup_arg);
 +
 +      handle_untracked_files_arg(s);
 +
 +      if (all && argc > 0)
 +              die("Paths with -a does not make sense.");
 +      else if (interactive && argc > 0)
 +              die("Paths with --interactive does not make sense.");
 +
 +      if (null_termination && status_format == STATUS_FORMAT_LONG)
 +              status_format = STATUS_FORMAT_PORCELAIN;
 +      if (status_format != STATUS_FORMAT_LONG)
 +              dry_run = 1;
 +
 +      return argc;
 +}
 +
 +static int dry_run_commit(int argc, const char **argv, const char *prefix,
 +                        struct wt_status *s)
 +{
 +      int commitable;
 +      const char *index_file;
 +
 +      index_file = prepare_index(argc, argv, prefix, 1);
 +      commitable = run_status(stdout, index_file, prefix, 0, s);
 +      rollback_index_files();
 +
 +      return commitable ? 0 : 1;
 +}
 +
 +static int parse_status_slot(const char *var, int offset)
 +{
 +      if (!strcasecmp(var+offset, "header"))
 +              return WT_STATUS_HEADER;
 +      if (!strcasecmp(var+offset, "updated")
 +              || !strcasecmp(var+offset, "added"))
 +              return WT_STATUS_UPDATED;
 +      if (!strcasecmp(var+offset, "changed"))
 +              return WT_STATUS_CHANGED;
 +      if (!strcasecmp(var+offset, "untracked"))
 +              return WT_STATUS_UNTRACKED;
 +      if (!strcasecmp(var+offset, "nobranch"))
 +              return WT_STATUS_NOBRANCH;
 +      if (!strcasecmp(var+offset, "unmerged"))
 +              return WT_STATUS_UNMERGED;
 +      return -1;
 +}
 +
 +static int git_status_config(const char *k, const char *v, void *cb)
 +{
 +      struct wt_status *s = cb;
 +
 +      if (!strcmp(k, "status.submodulesummary")) {
 +              int is_bool;
 +              s->submodule_summary = git_config_bool_or_int(k, v, &is_bool);
 +              if (is_bool && s->submodule_summary)
 +                      s->submodule_summary = -1;
 +              return 0;
 +      }
 +      if (!strcmp(k, "status.color") || !strcmp(k, "color.status")) {
 +              s->use_color = git_config_colorbool(k, v, -1);
 +              return 0;
 +      }
 +      if (!prefixcmp(k, "status.color.") || !prefixcmp(k, "color.status.")) {
 +              int slot = parse_status_slot(k, 13);
 +              if (slot < 0)
 +                      return 0;
 +              if (!v)
 +                      return config_error_nonbool(k);
 +              color_parse(v, k, s->color_palette[slot]);
 +              return 0;
 +      }
 +      if (!strcmp(k, "status.relativepaths")) {
 +              s->relative_paths = git_config_bool(k, v);
 +              return 0;
 +      }
 +      if (!strcmp(k, "status.showuntrackedfiles")) {
 +              if (!v)
 +                      return config_error_nonbool(k);
 +              else if (!strcmp(v, "no"))
 +                      s->show_untracked_files = SHOW_NO_UNTRACKED_FILES;
 +              else if (!strcmp(v, "normal"))
 +                      s->show_untracked_files = SHOW_NORMAL_UNTRACKED_FILES;
 +              else if (!strcmp(v, "all"))
 +                      s->show_untracked_files = SHOW_ALL_UNTRACKED_FILES;
 +              else
 +                      return error("Invalid untracked files mode '%s'", v);
 +              return 0;
 +      }
 +      return git_diff_ui_config(k, v, NULL);
 +}
 +
 +int cmd_status(int argc, const char **argv, const char *prefix)
 +{
 +      struct wt_status s;
 +      unsigned char sha1[20];
 +      static struct option builtin_status_options[] = {
 +              OPT__VERBOSE(&verbose),
 +              OPT_SET_INT('s', "short", &status_format,
 +                          "show status concisely", STATUS_FORMAT_SHORT),
 +              OPT_SET_INT(0, "porcelain", &status_format,
 +                          "show porcelain output format",
 +                          STATUS_FORMAT_PORCELAIN),
 +              OPT_BOOLEAN('z', "null", &null_termination,
 +                          "terminate entries with NUL"),
 +              { OPTION_STRING, 'u', "untracked-files", &untracked_files_arg,
 +                "mode",
 +                "show untracked files, optional modes: all, normal, no. (Default: all)",
 +                PARSE_OPT_OPTARG, NULL, (intptr_t)"all" },
 +              OPT_END(),
 +      };
 +
 +      if (null_termination && status_format == STATUS_FORMAT_LONG)
 +              status_format = STATUS_FORMAT_PORCELAIN;
 +
 +      wt_status_prepare(&s);
 +      git_config(git_status_config, &s);
 +      in_merge = file_exists(git_path("MERGE_HEAD"));
 +      argc = parse_options(argc, argv, prefix,
 +                           builtin_status_options,
 +                           builtin_status_usage, 0);
 +      handle_untracked_files_arg(&s);
 +
 +      if (*argv)
 +              s.pathspec = get_pathspec(prefix, argv);
 +
 +      read_cache_preload(s.pathspec);
 +      refresh_index(&the_index, REFRESH_QUIET|REFRESH_UNMERGED, s.pathspec, NULL, NULL);
 +      s.is_initial = get_sha1(s.reference, sha1) ? 1 : 0;
 +      s.in_merge = in_merge;
 +      wt_status_collect(&s);
 +
 +      if (s.relative_paths)
 +              s.prefix = prefix;
 +      if (s.use_color == -1)
 +              s.use_color = git_use_color_default;
 +      if (diff_use_color_default == -1)
 +              diff_use_color_default = git_use_color_default;
 +
 +      switch (status_format) {
 +      case STATUS_FORMAT_SHORT:
 +              wt_shortstatus_print(&s, null_termination);
 +              break;
 +      case STATUS_FORMAT_PORCELAIN:
 +              wt_porcelain_print(&s, null_termination);
 +              break;
 +      case STATUS_FORMAT_LONG:
 +              s.verbose = verbose;
 +              wt_status_print(&s);
 +              break;
 +      }
 +      return 0;
 +}
 +
 +static void print_summary(const char *prefix, const unsigned char *sha1)
 +{
 +      struct rev_info rev;
 +      struct commit *commit;
 +      struct strbuf format = STRBUF_INIT;
 +      unsigned char junk_sha1[20];
 +      const char *head = resolve_ref("HEAD", junk_sha1, 0, NULL);
 +      struct pretty_print_context pctx = {0};
 +      struct strbuf author_ident = STRBUF_INIT;
 +      struct strbuf committer_ident = STRBUF_INIT;
 +
 +      commit = lookup_commit(sha1);
 +      if (!commit)
 +              die("couldn't look up newly created commit");
 +      if (!commit || parse_commit(commit))
 +              die("could not parse newly created commit");
 +
 +      strbuf_addstr(&format, "format:%h] %s");
 +
 +      format_commit_message(commit, "%an <%ae>", &author_ident, &pctx);
 +      format_commit_message(commit, "%cn <%ce>", &committer_ident, &pctx);
 +      if (strbuf_cmp(&author_ident, &committer_ident)) {
 +              strbuf_addstr(&format, "\n Author: ");
 +              strbuf_addbuf_percentquote(&format, &author_ident);
 +      }
 +      if (!user_ident_sufficiently_given()) {
 +              strbuf_addstr(&format, "\n Committer: ");
 +              strbuf_addbuf_percentquote(&format, &committer_ident);
 +              if (advice_implicit_identity) {
 +                      strbuf_addch(&format, '\n');
 +                      strbuf_addstr(&format, implicit_ident_advice);
 +              }
 +      }
 +      strbuf_release(&author_ident);
 +      strbuf_release(&committer_ident);
 +
 +      init_revisions(&rev, prefix);
 +      setup_revisions(0, NULL, &rev, NULL);
 +
 +      rev.abbrev = 0;
 +      rev.diff = 1;
 +      rev.diffopt.output_format =
 +              DIFF_FORMAT_SHORTSTAT | DIFF_FORMAT_SUMMARY;
 +
 +      rev.verbose_header = 1;
 +      rev.show_root_diff = 1;
 +      get_commit_format(format.buf, &rev);
 +      rev.always_show_header = 0;
 +      rev.diffopt.detect_rename = 1;
 +      rev.diffopt.rename_limit = 100;
 +      rev.diffopt.break_opt = 0;
 +      diff_setup_done(&rev.diffopt);
 +
 +      printf("[%s%s ",
 +              !prefixcmp(head, "refs/heads/") ?
 +                      head + 11 :
 +                      !strcmp(head, "HEAD") ?
 +                              "detached HEAD" :
 +                              head,
 +              initial_commit ? " (root-commit)" : "");
 +
 +      if (!log_tree_commit(&rev, commit)) {
 +              struct pretty_print_context ctx = {0};
 +              struct strbuf buf = STRBUF_INIT;
 +              ctx.date_mode = DATE_NORMAL;
 +              format_commit_message(commit, format.buf + 7, &buf, &ctx);
 +              printf("%s\n", buf.buf);
 +              strbuf_release(&buf);
 +      }
 +      strbuf_release(&format);
 +}
 +
 +static int git_commit_config(const char *k, const char *v, void *cb)
 +{
 +      struct wt_status *s = cb;
 +
 +      if (!strcmp(k, "commit.template"))
 +              return git_config_pathname(&template_file, k, v);
 +      if (!strcmp(k, "commit.status")) {
 +              include_status = git_config_bool(k, v);
 +              return 0;
 +      }
 +
 +      return git_status_config(k, v, s);
 +}
 +
++static const char post_rewrite_hook[] = "hooks/post-rewrite";
++
++static int run_rewrite_hook(const unsigned char *oldsha1,
++                          const unsigned char *newsha1)
++{
++      /* oldsha1 SP newsha1 LF NUL */
++      static char buf[2*40 + 3];
++      struct child_process proc;
++      const char *argv[3];
++      int code;
++      size_t n;
++
++      if (access(git_path(post_rewrite_hook), X_OK) < 0)
++              return 0;
++
++      argv[0] = git_path(post_rewrite_hook);
++      argv[1] = "amend";
++      argv[2] = NULL;
++
++      memset(&proc, 0, sizeof(proc));
++      proc.argv = argv;
++      proc.in = -1;
++      proc.stdout_to_stderr = 1;
++
++      code = start_command(&proc);
++      if (code)
++              return code;
++      n = snprintf(buf, sizeof(buf), "%s %s\n",
++                   sha1_to_hex(oldsha1), sha1_to_hex(newsha1));
++      write_in_full(proc.in, buf, n);
++      close(proc.in);
++      return finish_command(&proc);
++}
++
 +int cmd_commit(int argc, const char **argv, const char *prefix)
 +{
 +      struct strbuf sb = STRBUF_INIT;
 +      const char *index_file, *reflog_msg;
 +      char *nl, *p;
 +      unsigned char commit_sha1[20];
 +      struct ref_lock *ref_lock;
 +      struct commit_list *parents = NULL, **pptr = &parents;
 +      struct stat statbuf;
 +      int allow_fast_forward = 1;
 +      struct wt_status s;
 +
 +      wt_status_prepare(&s);
 +      git_config(git_commit_config, &s);
 +      in_merge = file_exists(git_path("MERGE_HEAD"));
 +      s.in_merge = in_merge;
 +
 +      if (s.use_color == -1)
 +              s.use_color = git_use_color_default;
 +      argc = parse_and_validate_options(argc, argv, builtin_commit_usage,
 +                                        prefix, &s);
 +      if (dry_run) {
 +              if (diff_use_color_default == -1)
 +                      diff_use_color_default = git_use_color_default;
 +              return dry_run_commit(argc, argv, prefix, &s);
 +      }
 +      index_file = prepare_index(argc, argv, prefix, 0);
 +
 +      /* Set up everything for writing the commit object.  This includes
 +         running hooks, writing the trees, and interacting with the user.  */
 +      if (!prepare_to_commit(index_file, prefix, &s)) {
 +              rollback_index_files();
 +              return 1;
 +      }
 +
 +      /* Determine parents */
 +      if (initial_commit) {
 +              reflog_msg = "commit (initial)";
 +      } else if (amend) {
 +              struct commit_list *c;
 +              struct commit *commit;
 +
 +              reflog_msg = "commit (amend)";
 +              commit = lookup_commit(head_sha1);
 +              if (!commit || parse_commit(commit))
 +                      die("could not parse HEAD commit");
 +
 +              for (c = commit->parents; c; c = c->next)
 +                      pptr = &commit_list_insert(c->item, pptr)->next;
 +      } else if (in_merge) {
 +              struct strbuf m = STRBUF_INIT;
 +              FILE *fp;
 +
 +              reflog_msg = "commit (merge)";
 +              pptr = &commit_list_insert(lookup_commit(head_sha1), pptr)->next;
 +              fp = fopen(git_path("MERGE_HEAD"), "r");
 +              if (fp == NULL)
 +                      die_errno("could not open '%s' for reading",
 +                                git_path("MERGE_HEAD"));
 +              while (strbuf_getline(&m, fp, '\n') != EOF) {
 +                      unsigned char sha1[20];
 +                      if (get_sha1_hex(m.buf, sha1) < 0)
 +                              die("Corrupt MERGE_HEAD file (%s)", m.buf);
 +                      pptr = &commit_list_insert(lookup_commit(sha1), pptr)->next;
 +              }
 +              fclose(fp);
 +              strbuf_release(&m);
 +              if (!stat(git_path("MERGE_MODE"), &statbuf)) {
 +                      if (strbuf_read_file(&sb, git_path("MERGE_MODE"), 0) < 0)
 +                              die_errno("could not read MERGE_MODE");
 +                      if (!strcmp(sb.buf, "no-ff"))
 +                              allow_fast_forward = 0;
 +              }
 +              if (allow_fast_forward)
 +                      parents = reduce_heads(parents);
 +      } else {
 +              reflog_msg = "commit";
 +              pptr = &commit_list_insert(lookup_commit(head_sha1), pptr)->next;
 +      }
 +
 +      /* Finally, get the commit message */
 +      strbuf_reset(&sb);
 +      if (strbuf_read_file(&sb, git_path(commit_editmsg), 0) < 0) {
 +              int saved_errno = errno;
 +              rollback_index_files();
 +              die("could not read commit message: %s", strerror(saved_errno));
 +      }
 +
 +      /* Truncate the message just before the diff, if any. */
 +      if (verbose) {
 +              p = strstr(sb.buf, "\ndiff --git ");
 +              if (p != NULL)
 +                      strbuf_setlen(&sb, p - sb.buf + 1);
 +      }
 +
 +      if (cleanup_mode != CLEANUP_NONE)
 +              stripspace(&sb, cleanup_mode == CLEANUP_ALL);
 +      if (message_is_empty(&sb)) {
 +              rollback_index_files();
 +              fprintf(stderr, "Aborting commit due to empty commit message.\n");
 +              exit(1);
 +      }
 +
 +      if (commit_tree(sb.buf, active_cache_tree->sha1, parents, commit_sha1,
 +                      fmt_ident(author_name, author_email, author_date,
 +                              IDENT_ERROR_ON_NO_NAME))) {
 +              rollback_index_files();
 +              die("failed to write commit object");
 +      }
 +
 +      ref_lock = lock_any_ref_for_update("HEAD",
 +                                         initial_commit ? NULL : head_sha1,
 +                                         0);
 +
 +      nl = strchr(sb.buf, '\n');
 +      if (nl)
 +              strbuf_setlen(&sb, nl + 1 - sb.buf);
 +      else
 +              strbuf_addch(&sb, '\n');
 +      strbuf_insert(&sb, 0, reflog_msg, strlen(reflog_msg));
 +      strbuf_insert(&sb, strlen(reflog_msg), ": ", 2);
 +
 +      if (!ref_lock) {
 +              rollback_index_files();
 +              die("cannot lock HEAD ref");
 +      }
 +      if (write_ref_sha1(ref_lock, commit_sha1, sb.buf) < 0) {
 +              rollback_index_files();
 +              die("cannot update HEAD ref");
 +      }
 +
 +      unlink(git_path("MERGE_HEAD"));
 +      unlink(git_path("MERGE_MSG"));
 +      unlink(git_path("MERGE_MODE"));
 +      unlink(git_path("SQUASH_MSG"));
 +
 +      if (commit_index_files())
 +              die ("Repository has been updated, but unable to write\n"
 +                   "new_index file. Check that disk is not full or quota is\n"
 +                   "not exceeded, and then \"git reset HEAD\" to recover.");
 +
 +      rerere(0);
 +      run_hook(get_index_file(), "post-commit", NULL);
++      if (amend && !no_post_rewrite) {
++              struct notes_rewrite_cfg *cfg;
++              cfg = init_copy_notes_for_rewrite("amend");
++              if (cfg) {
++                      copy_note_for_rewrite(cfg, head_sha1, commit_sha1);
++                      finish_copy_notes_for_rewrite(cfg);
++              }
++              run_rewrite_hook(head_sha1, commit_sha1);
++      }
 +      if (!quiet)
 +              print_summary(prefix, commit_sha1);
 +
 +      return 0;
 +}

diff --cc builtin/log.c
index fade77200f14514950c727bae7af402d7174f11a,0000000000000000000000000000000000000000..a8dd8c989c5a135e14c6fc06ea3b23f4f0cd0bec
mode 100644,000000..100644
--- 1/builtin/log.c
--- /dev/null
+++ b/builtin/log.c
@@@ -1,1401 -1,0 +1,1406 @@@
 +/*
 + * Builtin "git log" and related commands (show, whatchanged)
 + *
 + * (C) Copyright 2006 Linus Torvalds
 + *             2006 Junio Hamano
 + */
 +#include "cache.h"
 +#include "color.h"
 +#include "commit.h"
 +#include "diff.h"
 +#include "revision.h"
 +#include "log-tree.h"
 +#include "builtin.h"
 +#include "tag.h"
 +#include "reflog-walk.h"
 +#include "patch-ids.h"
 +#include "run-command.h"
 +#include "shortlog.h"
 +#include "remote.h"
 +#include "string-list.h"
 +#include "parse-options.h"
 +
 +/* Set a default date-time format for git log ("log.date" config variable) */
 +static const char *default_date_mode = NULL;
 +
 +static int default_show_root = 1;
 +static const char *fmt_patch_subject_prefix = "PATCH";
 +static const char *fmt_pretty;
 +
 +static const char * const builtin_log_usage =
 +      "git log [<options>] [<since>..<until>] [[--] <path>...]\n"
 +      "   or: git show [options] <object>...";
 +
 +static void cmd_log_init(int argc, const char **argv, const char *prefix,
 +                       struct rev_info *rev, struct setup_revision_opt *opt)
 +{
 +      int i;
 +      int decoration_style = 0;
 +
 +      rev->abbrev = DEFAULT_ABBREV;
 +      rev->commit_format = CMIT_FMT_DEFAULT;
 +      if (fmt_pretty)
 +              get_commit_format(fmt_pretty, rev);
 +      rev->verbose_header = 1;
 +      DIFF_OPT_SET(&rev->diffopt, RECURSIVE);
 +      rev->show_root_diff = default_show_root;
 +      rev->subject_prefix = fmt_patch_subject_prefix;
 +      DIFF_OPT_SET(&rev->diffopt, ALLOW_TEXTCONV);
 +
 +      if (default_date_mode)
 +              rev->date_mode = parse_date_format(default_date_mode);
 +
 +      /*
 +       * Check for -h before setup_revisions(), or "git log -h" will
 +       * fail when run without a git directory.
 +       */
 +      if (argc == 2 && !strcmp(argv[1], "-h"))
 +              usage(builtin_log_usage);
 +      argc = setup_revisions(argc, argv, rev, opt);
 +
 +      if (!rev->show_notes_given && !rev->pretty_given)
 +              rev->show_notes = 1;
++      if (rev->show_notes)
++              init_display_notes(&rev->notes_opt);
 +
 +      if (rev->diffopt.pickaxe || rev->diffopt.filter)
 +              rev->always_show_header = 0;
 +      if (DIFF_OPT_TST(&rev->diffopt, FOLLOW_RENAMES)) {
 +              rev->always_show_header = 0;
 +              if (rev->diffopt.nr_paths != 1)
 +                      usage("git logs can only follow renames on one pathname at a time");
 +      }
 +      for (i = 1; i < argc; i++) {
 +              const char *arg = argv[i];
 +              if (!strcmp(arg, "--decorate")) {
 +                      decoration_style = DECORATE_SHORT_REFS;
 +              } else if (!prefixcmp(arg, "--decorate=")) {
 +                      const char *v = skip_prefix(arg, "--decorate=");
 +                      if (!strcmp(v, "full"))
 +                              decoration_style = DECORATE_FULL_REFS;
 +                      else if (!strcmp(v, "short"))
 +                              decoration_style = DECORATE_SHORT_REFS;
 +                      else
 +                              die("invalid --decorate option: %s", arg);
 +              } else if (!strcmp(arg, "--source")) {
 +                      rev->show_source = 1;
 +              } else if (!strcmp(arg, "-h")) {
 +                      usage(builtin_log_usage);
 +              } else
 +                      die("unrecognized argument: %s", arg);
 +      }
 +      if (decoration_style) {
 +              rev->show_decorations = 1;
 +              load_ref_decorations(decoration_style);
 +      }
 +}
 +
 +/*
 + * This gives a rough estimate for how many commits we
 + * will print out in the list.
 + */
 +static int estimate_commit_count(struct rev_info *rev, struct commit_list *list)
 +{
 +      int n = 0;
 +
 +      while (list) {
 +              struct commit *commit = list->item;
 +              unsigned int flags = commit->object.flags;
 +              list = list->next;
 +              if (!(flags & (TREESAME | UNINTERESTING)))
 +                      n++;
 +      }
 +      return n;
 +}
 +
 +static void show_early_header(struct rev_info *rev, const char *stage, int nr)
 +{
 +      if (rev->shown_one) {
 +              rev->shown_one = 0;
 +              if (rev->commit_format != CMIT_FMT_ONELINE)
 +                      putchar(rev->diffopt.line_termination);
 +      }
 +      printf("Final output: %d %s\n", nr, stage);
 +}
 +
 +static struct itimerval early_output_timer;
 +
 +static void log_show_early(struct rev_info *revs, struct commit_list *list)
 +{
 +      int i = revs->early_output;
 +      int show_header = 1;
 +
 +      sort_in_topological_order(&list, revs->lifo);
 +      while (list && i) {
 +              struct commit *commit = list->item;
 +              switch (simplify_commit(revs, commit)) {
 +              case commit_show:
 +                      if (show_header) {
 +                              int n = estimate_commit_count(revs, list);
 +                              show_early_header(revs, "incomplete", n);
 +                              show_header = 0;
 +                      }
 +                      log_tree_commit(revs, commit);
 +                      i--;
 +                      break;
 +              case commit_ignore:
 +                      break;
 +              case commit_error:
 +                      return;
 +              }
 +              list = list->next;
 +      }
 +
 +      /* Did we already get enough commits for the early output? */
 +      if (!i)
 +              return;
 +
 +      /*
 +       * ..if no, then repeat it twice a second until we
 +       * do.
 +       *
 +       * NOTE! We don't use "it_interval", because if the
 +       * reader isn't listening, we want our output to be
 +       * throttled by the writing, and not have the timer
 +       * trigger every second even if we're blocked on a
 +       * reader!
 +       */
 +      early_output_timer.it_value.tv_sec = 0;
 +      early_output_timer.it_value.tv_usec = 500000;
 +      setitimer(ITIMER_REAL, &early_output_timer, NULL);
 +}
 +
 +static void early_output(int signal)
 +{
 +      show_early_output = log_show_early;
 +}
 +
 +static void setup_early_output(struct rev_info *rev)
 +{
 +      struct sigaction sa;
 +
 +      /*
 +       * Set up the signal handler, minimally intrusively:
 +       * we only set a single volatile integer word (not
 +       * using sigatomic_t - trying to avoid unnecessary
 +       * system dependencies and headers), and using
 +       * SA_RESTART.
 +       */
 +      memset(&sa, 0, sizeof(sa));
 +      sa.sa_handler = early_output;
 +      sigemptyset(&sa.sa_mask);
 +      sa.sa_flags = SA_RESTART;
 +      sigaction(SIGALRM, &sa, NULL);
 +
 +      /*
 +       * If we can get the whole output in less than a
 +       * tenth of a second, don't even bother doing the
 +       * early-output thing..
 +       *
 +       * This is a one-time-only trigger.
 +       */
 +      early_output_timer.it_value.tv_sec = 0;
 +      early_output_timer.it_value.tv_usec = 100000;
 +      setitimer(ITIMER_REAL, &early_output_timer, NULL);
 +}
 +
 +static void finish_early_output(struct rev_info *rev)
 +{
 +      int n = estimate_commit_count(rev, rev->commits);
 +      signal(SIGALRM, SIG_IGN);
 +      show_early_header(rev, "done", n);
 +}
 +
 +static int cmd_log_walk(struct rev_info *rev)
 +{
 +      struct commit *commit;
 +
 +      if (rev->early_output)
 +              setup_early_output(rev);
 +
 +      if (prepare_revision_walk(rev))
 +              die("revision walk setup failed");
 +
 +      if (rev->early_output)
 +              finish_early_output(rev);
 +
 +      /*
 +       * For --check and --exit-code, the exit code is based on CHECK_FAILED
 +       * and HAS_CHANGES being accumulated in rev->diffopt, so be careful to
 +       * retain that state information if replacing rev->diffopt in this loop
 +       */
 +      while ((commit = get_revision(rev)) != NULL) {
 +              log_tree_commit(rev, commit);
 +              if (!rev->reflog_info) {
 +                      /* we allow cycles in reflog ancestry */
 +                      free(commit->buffer);
 +                      commit->buffer = NULL;
 +              }
 +              free_commit_list(commit->parents);
 +              commit->parents = NULL;
 +      }
 +      if (rev->diffopt.output_format & DIFF_FORMAT_CHECKDIFF &&
 +          DIFF_OPT_TST(&rev->diffopt, CHECK_FAILED)) {
 +              return 02;
 +      }
 +      return diff_result_code(&rev->diffopt, 0);
 +}
 +
 +static int git_log_config(const char *var, const char *value, void *cb)
 +{
 +      if (!strcmp(var, "format.pretty"))
 +              return git_config_string(&fmt_pretty, var, value);
 +      if (!strcmp(var, "format.subjectprefix"))
 +              return git_config_string(&fmt_patch_subject_prefix, var, value);
 +      if (!strcmp(var, "log.date"))
 +              return git_config_string(&default_date_mode, var, value);
 +      if (!strcmp(var, "log.showroot")) {
 +              default_show_root = git_config_bool(var, value);
 +              return 0;
 +      }
 +      return git_diff_ui_config(var, value, cb);
 +}
 +
 +int cmd_whatchanged(int argc, const char **argv, const char *prefix)
 +{
 +      struct rev_info rev;
 +      struct setup_revision_opt opt;
 +
 +      git_config(git_log_config, NULL);
 +
 +      if (diff_use_color_default == -1)
 +              diff_use_color_default = git_use_color_default;
 +
 +      init_revisions(&rev, prefix);
 +      rev.diff = 1;
 +      rev.simplify_history = 0;
 +      memset(&opt, 0, sizeof(opt));
 +      opt.def = "HEAD";
 +      cmd_log_init(argc, argv, prefix, &rev, &opt);
 +      if (!rev.diffopt.output_format)
 +              rev.diffopt.output_format = DIFF_FORMAT_RAW;
 +      return cmd_log_walk(&rev);
 +}
 +
 +static void show_tagger(char *buf, int len, struct rev_info *rev)
 +{
 +      struct strbuf out = STRBUF_INIT;
 +
 +      pp_user_info("Tagger", rev->commit_format, &out, buf, rev->date_mode,
 +              git_log_output_encoding ?
 +              git_log_output_encoding: git_commit_encoding);
 +      printf("%s", out.buf);
 +      strbuf_release(&out);
 +}
 +
 +static int show_object(const unsigned char *sha1, int show_tag_object,
 +      struct rev_info *rev)
 +{
 +      unsigned long size;
 +      enum object_type type;
 +      char *buf = read_sha1_file(sha1, &type, &size);
 +      int offset = 0;
 +
 +      if (!buf)
 +              return error("Could not read object %s", sha1_to_hex(sha1));
 +
 +      if (show_tag_object)
 +              while (offset < size && buf[offset] != '\n') {
 +                      int new_offset = offset + 1;
 +                      while (new_offset < size && buf[new_offset++] != '\n')
 +                              ; /* do nothing */
 +                      if (!prefixcmp(buf + offset, "tagger "))
 +                              show_tagger(buf + offset + 7,
 +                                          new_offset - offset - 7, rev);
 +                      offset = new_offset;
 +              }
 +
 +      if (offset < size)
 +              fwrite(buf + offset, size - offset, 1, stdout);
 +      free(buf);
 +      return 0;
 +}
 +
 +static int show_tree_object(const unsigned char *sha1,
 +              const char *base, int baselen,
 +              const char *pathname, unsigned mode, int stage, void *context)
 +{
 +      printf("%s%s\n", pathname, S_ISDIR(mode) ? "/" : "");
 +      return 0;
 +}
 +
 +static void show_rev_tweak_rev(struct rev_info *rev, struct setup_revision_opt *opt)
 +{
 +      if (rev->ignore_merges) {
 +              /* There was no "-m" on the command line */
 +              rev->ignore_merges = 0;
 +              if (!rev->first_parent_only && !rev->combine_merges) {
 +                      /* No "--first-parent", "-c", nor "--cc" */
 +                      rev->combine_merges = 1;
 +                      rev->dense_combined_merges = 1;
 +              }
 +      }
 +      if (!rev->diffopt.output_format)
 +              rev->diffopt.output_format = DIFF_FORMAT_PATCH;
 +}
 +
 +int cmd_show(int argc, const char **argv, const char *prefix)
 +{
 +      struct rev_info rev;
 +      struct object_array_entry *objects;
 +      struct setup_revision_opt opt;
 +      int i, count, ret = 0;
 +
 +      git_config(git_log_config, NULL);
 +
 +      if (diff_use_color_default == -1)
 +              diff_use_color_default = git_use_color_default;
 +
 +      init_revisions(&rev, prefix);
 +      rev.diff = 1;
 +      rev.always_show_header = 1;
 +      rev.no_walk = 1;
 +      memset(&opt, 0, sizeof(opt));
 +      opt.def = "HEAD";
 +      opt.tweak = show_rev_tweak_rev;
 +      cmd_log_init(argc, argv, prefix, &rev, &opt);
 +
 +      count = rev.pending.nr;
 +      objects = rev.pending.objects;
 +      for (i = 0; i < count && !ret; i++) {
 +              struct object *o = objects[i].item;
 +              const char *name = objects[i].name;
 +              switch (o->type) {
 +              case OBJ_BLOB:
 +                      ret = show_object(o->sha1, 0, NULL);
 +                      break;
 +              case OBJ_TAG: {
 +                      struct tag *t = (struct tag *)o;
 +
 +                      if (rev.shown_one)
 +                              putchar('\n');
 +                      printf("%stag %s%s\n",
 +                                      diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
 +                                      t->tag,
 +                                      diff_get_color_opt(&rev.diffopt, DIFF_RESET));
 +                      ret = show_object(o->sha1, 1, &rev);
 +                      rev.shown_one = 1;
 +                      if (ret)
 +                              break;
 +                      o = parse_object(t->tagged->sha1);
 +                      if (!o)
 +                              ret = error("Could not read object %s",
 +                                          sha1_to_hex(t->tagged->sha1));
 +                      objects[i].item = o;
 +                      i--;
 +                      break;
 +              }
 +              case OBJ_TREE:
 +                      if (rev.shown_one)
 +                              putchar('\n');
 +                      printf("%stree %s%s\n\n",
 +                                      diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
 +                                      name,
 +                                      diff_get_color_opt(&rev.diffopt, DIFF_RESET));
 +                      read_tree_recursive((struct tree *)o, "", 0, 0, NULL,
 +                                      show_tree_object, NULL);
 +                      rev.shown_one = 1;
 +                      break;
 +              case OBJ_COMMIT:
 +                      rev.pending.nr = rev.pending.alloc = 0;
 +                      rev.pending.objects = NULL;
 +                      add_object_array(o, name, &rev.pending);
 +                      ret = cmd_log_walk(&rev);
 +                      break;
 +              default:
 +                      ret = error("Unknown type: %d", o->type);
 +              }
 +      }
 +      free(objects);
 +      return ret;
 +}
 +
 +/*
 + * This is equivalent to "git log -g --abbrev-commit --pretty=oneline"
 + */
 +int cmd_log_reflog(int argc, const char **argv, const char *prefix)
 +{
 +      struct rev_info rev;
 +      struct setup_revision_opt opt;
 +
 +      git_config(git_log_config, NULL);
 +
 +      if (diff_use_color_default == -1)
 +              diff_use_color_default = git_use_color_default;
 +
 +      init_revisions(&rev, prefix);
 +      init_reflog_walk(&rev.reflog_info);
 +      rev.abbrev_commit = 1;
 +      rev.verbose_header = 1;
 +      memset(&opt, 0, sizeof(opt));
 +      opt.def = "HEAD";
 +      cmd_log_init(argc, argv, prefix, &rev, &opt);
 +
 +      /*
 +       * This means that we override whatever commit format the user gave
 +       * on the cmd line.  Sad, but cmd_log_init() currently doesn't
 +       * allow us to set a different default.
 +       */
 +      rev.commit_format = CMIT_FMT_ONELINE;
 +      rev.use_terminator = 1;
 +      rev.always_show_header = 1;
 +
 +      /*
 +       * We get called through "git reflog", so unlike the other log
 +       * routines, we need to set up our pager manually..
 +       */
 +      setup_pager();
 +
 +      return cmd_log_walk(&rev);
 +}
 +
 +int cmd_log(int argc, const char **argv, const char *prefix)
 +{
 +      struct rev_info rev;
 +      struct setup_revision_opt opt;
 +
 +      git_config(git_log_config, NULL);
 +
 +      if (diff_use_color_default == -1)
 +              diff_use_color_default = git_use_color_default;
 +
 +      init_revisions(&rev, prefix);
 +      rev.always_show_header = 1;
 +      memset(&opt, 0, sizeof(opt));
 +      opt.def = "HEAD";
 +      cmd_log_init(argc, argv, prefix, &rev, &opt);
 +      return cmd_log_walk(&rev);
 +}
 +
 +/* format-patch */
 +
 +static const char *fmt_patch_suffix = ".patch";
 +static int numbered = 0;
 +static int auto_number = 1;
 +
 +static char *default_attach = NULL;
 +
 +static struct string_list extra_hdr;
 +static struct string_list extra_to;
 +static struct string_list extra_cc;
 +
 +static void add_header(const char *value)
 +{
 +      struct string_list_item *item;
 +      int len = strlen(value);
 +      while (len && value[len - 1] == '\n')
 +              len--;
 +
 +      if (!strncasecmp(value, "to: ", 4)) {
 +              item = string_list_append(value + 4, &extra_to);
 +              len -= 4;
 +      } else if (!strncasecmp(value, "cc: ", 4)) {
 +              item = string_list_append(value + 4, &extra_cc);
 +              len -= 4;
 +      } else {
 +              item = string_list_append(value, &extra_hdr);
 +      }
 +
 +      item->string[len] = '\0';
 +}
 +
 +#define THREAD_SHALLOW 1
 +#define THREAD_DEEP 2
 +static int thread = 0;
 +static int do_signoff = 0;
 +
 +static int git_format_config(const char *var, const char *value, void *cb)
 +{
 +      if (!strcmp(var, "format.headers")) {
 +              if (!value)
 +                      die("format.headers without value");
 +              add_header(value);
 +              return 0;
 +      }
 +      if (!strcmp(var, "format.suffix"))
 +              return git_config_string(&fmt_patch_suffix, var, value);
 +      if (!strcmp(var, "format.to")) {
 +              if (!value)
 +                      return config_error_nonbool(var);
 +              string_list_append(value, &extra_to);
 +              return 0;
 +      }
 +      if (!strcmp(var, "format.cc")) {
 +              if (!value)
 +                      return config_error_nonbool(var);
 +              string_list_append(value, &extra_cc);
 +              return 0;
 +      }
 +      if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
 +              return 0;
 +      }
 +      if (!strcmp(var, "format.numbered")) {
 +              if (value && !strcasecmp(value, "auto")) {
 +                      auto_number = 1;
 +                      return 0;
 +              }
 +              numbered = git_config_bool(var, value);
 +              auto_number = auto_number && numbered;
 +              return 0;
 +      }
 +      if (!strcmp(var, "format.attach")) {
 +              if (value && *value)
 +                      default_attach = xstrdup(value);
 +              else
 +                      default_attach = xstrdup(git_version_string);
 +              return 0;
 +      }
 +      if (!strcmp(var, "format.thread")) {
 +              if (value && !strcasecmp(value, "deep")) {
 +                      thread = THREAD_DEEP;
 +                      return 0;
 +              }
 +              if (value && !strcasecmp(value, "shallow")) {
 +                      thread = THREAD_SHALLOW;
 +                      return 0;
 +              }
 +              thread = git_config_bool(var, value) && THREAD_SHALLOW;
 +              return 0;
 +      }
 +      if (!strcmp(var, "format.signoff")) {
 +              do_signoff = git_config_bool(var, value);
 +              return 0;
 +      }
 +
 +      return git_log_config(var, value, cb);
 +}
 +
 +static FILE *realstdout = NULL;
 +static const char *output_directory = NULL;
 +static int outdir_offset;
 +
 +static int reopen_stdout(struct commit *commit, struct rev_info *rev)
 +{
 +      struct strbuf filename = STRBUF_INIT;
 +      int suffix_len = strlen(fmt_patch_suffix) + 1;
 +
 +      if (output_directory) {
 +              strbuf_addstr(&filename, output_directory);
 +              if (filename.len >=
 +                  PATH_MAX - FORMAT_PATCH_NAME_MAX - suffix_len)
 +                      return error("name of output directory is too long");
 +              if (filename.buf[filename.len - 1] != '/')
 +                      strbuf_addch(&filename, '/');
 +      }
 +
 +      get_patch_filename(commit, rev->nr, fmt_patch_suffix, &filename);
 +
 +      if (!DIFF_OPT_TST(&rev->diffopt, QUICK))
 +              fprintf(realstdout, "%s\n", filename.buf + outdir_offset);
 +
 +      if (freopen(filename.buf, "w", stdout) == NULL)
 +              return error("Cannot open patch file %s", filename.buf);
 +
 +      strbuf_release(&filename);
 +      return 0;
 +}
 +
 +static void get_patch_ids(struct rev_info *rev, struct patch_ids *ids, const char *prefix)
 +{
 +      struct rev_info check_rev;
 +      struct commit *commit;
 +      struct object *o1, *o2;
 +      unsigned flags1, flags2;
 +
 +      if (rev->pending.nr != 2)
 +              die("Need exactly one range.");
 +
 +      o1 = rev->pending.objects[0].item;
 +      flags1 = o1->flags;
 +      o2 = rev->pending.objects[1].item;
 +      flags2 = o2->flags;
 +
 +      if ((flags1 & UNINTERESTING) == (flags2 & UNINTERESTING))
 +              die("Not a range.");
 +
 +      init_patch_ids(ids);
 +
 +      /* given a range a..b get all patch ids for b..a */
 +      init_revisions(&check_rev, prefix);
 +      o1->flags ^= UNINTERESTING;
 +      o2->flags ^= UNINTERESTING;
 +      add_pending_object(&check_rev, o1, "o1");
 +      add_pending_object(&check_rev, o2, "o2");
 +      if (prepare_revision_walk(&check_rev))
 +              die("revision walk setup failed");
 +
 +      while ((commit = get_revision(&check_rev)) != NULL) {
 +              /* ignore merges */
 +              if (commit->parents && commit->parents->next)
 +                      continue;
 +
 +              add_commit_patch_id(commit, ids);
 +      }
 +
 +      /* reset for next revision walk */
 +      clear_commit_marks((struct commit *)o1,
 +                      SEEN | UNINTERESTING | SHOWN | ADDED);
 +      clear_commit_marks((struct commit *)o2,
 +                      SEEN | UNINTERESTING | SHOWN | ADDED);
 +      o1->flags = flags1;
 +      o2->flags = flags2;
 +}
 +
 +static void gen_message_id(struct rev_info *info, char *base)
 +{
 +      const char *committer = git_committer_info(IDENT_WARN_ON_NO_NAME);
 +      const char *email_start = strrchr(committer, '<');
 +      const char *email_end = strrchr(committer, '>');
 +      struct strbuf buf = STRBUF_INIT;
 +      if (!email_start || !email_end || email_start > email_end - 1)
 +              die("Could not extract email from committer identity.");
 +      strbuf_addf(&buf, "%s.%lu.git.%.*s", base,
 +                  (unsigned long) time(NULL),
 +                  (int)(email_end - email_start - 1), email_start + 1);
 +      info->message_id = strbuf_detach(&buf, NULL);
 +}
 +
 +static void make_cover_letter(struct rev_info *rev, int use_stdout,
 +                            int numbered, int numbered_files,
 +                            struct commit *origin,
 +                            int nr, struct commit **list, struct commit *head)
 +{
 +      const char *committer;
 +      const char *subject_start = NULL;
 +      const char *body = "*** SUBJECT HERE ***\n\n*** BLURB HERE ***\n";
 +      const char *msg;
 +      const char *extra_headers = rev->extra_headers;
 +      struct shortlog log;
 +      struct strbuf sb = STRBUF_INIT;
 +      int i;
 +      const char *encoding = "UTF-8";
 +      struct diff_options opts;
 +      int need_8bit_cte = 0;
 +      struct commit *commit = NULL;
 +
 +      if (rev->commit_format != CMIT_FMT_EMAIL)
 +              die("Cover letter needs email format");
 +
 +      committer = git_committer_info(0);
 +
 +      if (!numbered_files) {
 +              /*
 +               * We fake a commit for the cover letter so we get the filename
 +               * desired.
 +               */
 +              commit = xcalloc(1, sizeof(*commit));
 +              commit->buffer = xmalloc(400);
 +              snprintf(commit->buffer, 400,
 +                      "tree 0000000000000000000000000000000000000000\n"
 +                      "parent %s\n"
 +                      "author %s\n"
 +                      "committer %s\n\n"
 +                      "cover letter\n",
 +                      sha1_to_hex(head->object.sha1), committer, committer);
 +      }
 +
 +      if (!use_stdout && reopen_stdout(commit, rev))
 +              return;
 +
 +      if (commit) {
 +
 +              free(commit->buffer);
 +              free(commit);
 +      }
 +
 +      log_write_email_headers(rev, head, &subject_start, &extra_headers,
 +                              &need_8bit_cte);
 +
 +      for (i = 0; !need_8bit_cte && i < nr; i++)
 +              if (has_non_ascii(list[i]->buffer))
 +                      need_8bit_cte = 1;
 +
 +      msg = body;
 +      pp_user_info(NULL, CMIT_FMT_EMAIL, &sb, committer, DATE_RFC2822,
 +                   encoding);
 +      pp_title_line(CMIT_FMT_EMAIL, &msg, &sb, subject_start, extra_headers,
 +                    encoding, need_8bit_cte);
 +      pp_remainder(CMIT_FMT_EMAIL, &msg, &sb, 0);
 +      printf("%s\n", sb.buf);
 +
 +      strbuf_release(&sb);
 +
 +      shortlog_init(&log);
 +      log.wrap_lines = 1;
 +      log.wrap = 72;
 +      log.in1 = 2;
 +      log.in2 = 4;
 +      for (i = 0; i < nr; i++)
 +              shortlog_add_commit(&log, list[i]);
 +
 +      shortlog_output(&log);
 +
 +      /*
 +       * We can only do diffstat with a unique reference point
 +       */
 +      if (!origin)
 +              return;
 +
 +      memcpy(&opts, &rev->diffopt, sizeof(opts));
 +      opts.output_format = DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
 +
 +      diff_setup_done(&opts);
 +
 +      diff_tree_sha1(origin->tree->object.sha1,
 +                     head->tree->object.sha1,
 +                     "", &opts);
 +      diffcore_std(&opts);
 +      diff_flush(&opts);
 +
 +      printf("\n");
 +}
 +
 +static const char *clean_message_id(const char *msg_id)
 +{
 +      char ch;
 +      const char *a, *z, *m;
 +
 +      m = msg_id;
 +      while ((ch = *m) && (isspace(ch) || (ch == '<')))
 +              m++;
 +      a = m;
 +      z = NULL;
 +      while ((ch = *m)) {
 +              if (!isspace(ch) && (ch != '>'))
 +                      z = m;
 +              m++;
 +      }
 +      if (!z)
 +              die("insane in-reply-to: %s", msg_id);
 +      if (++z == m)
 +              return a;
 +      return xmemdupz(a, z - a);
 +}
 +
 +static const char *set_outdir(const char *prefix, const char *output_directory)
 +{
 +      if (output_directory && is_absolute_path(output_directory))
 +              return output_directory;
 +
 +      if (!prefix || !*prefix) {
 +              if (output_directory)
 +                      return output_directory;
 +              /* The user did not explicitly ask for "./" */
 +              outdir_offset = 2;
 +              return "./";
 +      }
 +
 +      outdir_offset = strlen(prefix);
 +      if (!output_directory)
 +              return prefix;
 +
 +      return xstrdup(prefix_filename(prefix, outdir_offset,
 +                                     output_directory));
 +}
 +
 +static const char * const builtin_format_patch_usage[] = {
 +      "git format-patch [options] [<since> | <revision range>]",
 +      NULL
 +};
 +
 +static int keep_subject = 0;
 +
 +static int keep_callback(const struct option *opt, const char *arg, int unset)
 +{
 +      ((struct rev_info *)opt->value)->total = -1;
 +      keep_subject = 1;
 +      return 0;
 +}
 +
 +static int subject_prefix = 0;
 +
 +static int subject_prefix_callback(const struct option *opt, const char *arg,
 +                          int unset)
 +{
 +      subject_prefix = 1;
 +      ((struct rev_info *)opt->value)->subject_prefix = arg;
 +      return 0;
 +}
 +
 +static int numbered_cmdline_opt = 0;
 +
 +static int numbered_callback(const struct option *opt, const char *arg,
 +                           int unset)
 +{
 +      *(int *)opt->value = numbered_cmdline_opt = unset ? 0 : 1;
 +      if (unset)
 +              auto_number =  0;
 +      return 0;
 +}
 +
 +static int no_numbered_callback(const struct option *opt, const char *arg,
 +                              int unset)
 +{
 +      return numbered_callback(opt, arg, 1);
 +}
 +
 +static int output_directory_callback(const struct option *opt, const char *arg,
 +                            int unset)
 +{
 +      const char **dir = (const char **)opt->value;
 +      if (*dir)
 +              die("Two output directories?");
 +      *dir = arg;
 +      return 0;
 +}
 +
 +static int thread_callback(const struct option *opt, const char *arg, int unset)
 +{
 +      int *thread = (int *)opt->value;
 +      if (unset)
 +              *thread = 0;
 +      else if (!arg || !strcmp(arg, "shallow"))
 +              *thread = THREAD_SHALLOW;
 +      else if (!strcmp(arg, "deep"))
 +              *thread = THREAD_DEEP;
 +      else
 +              return 1;
 +      return 0;
 +}
 +
 +static int attach_callback(const struct option *opt, const char *arg, int unset)
 +{
 +      struct rev_info *rev = (struct rev_info *)opt->value;
 +      if (unset)
 +              rev->mime_boundary = NULL;
 +      else if (arg)
 +              rev->mime_boundary = arg;
 +      else
 +              rev->mime_boundary = git_version_string;
 +      rev->no_inline = unset ? 0 : 1;
 +      return 0;
 +}
 +
 +static int inline_callback(const struct option *opt, const char *arg, int unset)
 +{
 +      struct rev_info *rev = (struct rev_info *)opt->value;
 +      if (unset)
 +              rev->mime_boundary = NULL;
 +      else if (arg)
 +              rev->mime_boundary = arg;
 +      else
 +              rev->mime_boundary = git_version_string;
 +      rev->no_inline = 0;
 +      return 0;
 +}
 +
 +static int header_callback(const struct option *opt, const char *arg, int unset)
 +{
 +      if (unset) {
 +              string_list_clear(&extra_hdr, 0);
 +              string_list_clear(&extra_to, 0);
 +              string_list_clear(&extra_cc, 0);
 +      } else {
 +          add_header(arg);
 +      }
 +      return 0;
 +}
 +
 +static int to_callback(const struct option *opt, const char *arg, int unset)
 +{
 +      if (unset)
 +              string_list_clear(&extra_to, 0);
 +      else
 +              string_list_append(arg, &extra_to);
 +      return 0;
 +}
 +
 +static int cc_callback(const struct option *opt, const char *arg, int unset)
 +{
 +      if (unset)
 +              string_list_clear(&extra_cc, 0);
 +      else
 +              string_list_append(arg, &extra_cc);
 +      return 0;
 +}
 +
 +int cmd_format_patch(int argc, const char **argv, const char *prefix)
 +{
 +      struct commit *commit;
 +      struct commit **list = NULL;
 +      struct rev_info rev;
 +      struct setup_revision_opt s_r_opt;
 +      int nr = 0, total, i;
 +      int use_stdout = 0;
 +      int start_number = -1;
 +      int numbered_files = 0;         /* _just_ numbers */
 +      int ignore_if_in_upstream = 0;
 +      int cover_letter = 0;
 +      int boundary_count = 0;
 +      int no_binary_diff = 0;
 +      struct commit *origin = NULL, *head = NULL;
 +      const char *in_reply_to = NULL;
 +      struct patch_ids ids;
 +      char *add_signoff = NULL;
 +      struct strbuf buf = STRBUF_INIT;
 +      int use_patch_format = 0;
 +      const struct option builtin_format_patch_options[] = {
 +              { OPTION_CALLBACK, 'n', "numbered", &numbered, NULL,
 +                          "use [PATCH n/m] even with a single patch",
 +                          PARSE_OPT_NOARG, numbered_callback },
 +              { OPTION_CALLBACK, 'N', "no-numbered", &numbered, NULL,
 +                          "use [PATCH] even with multiple patches",
 +                          PARSE_OPT_NOARG, no_numbered_callback },
 +              OPT_BOOLEAN('s', "signoff", &do_signoff, "add Signed-off-by:"),
 +              OPT_BOOLEAN(0, "stdout", &use_stdout,
 +                          "print patches to standard out"),
 +              OPT_BOOLEAN(0, "cover-letter", &cover_letter,
 +                          "generate a cover letter"),
 +              OPT_BOOLEAN(0, "numbered-files", &numbered_files,
 +                          "use simple number sequence for output file names"),
 +              OPT_STRING(0, "suffix", &fmt_patch_suffix, "sfx",
 +                          "use <sfx> instead of '.patch'"),
 +              OPT_INTEGER(0, "start-number", &start_number,
 +                          "start numbering patches at <n> instead of 1"),
 +              { OPTION_CALLBACK, 0, "subject-prefix", &rev, "prefix",
 +                          "Use [<prefix>] instead of [PATCH]",
 +                          PARSE_OPT_NONEG, subject_prefix_callback },
 +              { OPTION_CALLBACK, 'o', "output-directory", &output_directory,
 +                          "dir", "store resulting files in <dir>",
 +                          PARSE_OPT_NONEG, output_directory_callback },
 +              { OPTION_CALLBACK, 'k', "keep-subject", &rev, NULL,
 +                          "don't strip/add [PATCH]",
 +                          PARSE_OPT_NOARG | PARSE_OPT_NONEG, keep_callback },
 +              OPT_BOOLEAN(0, "no-binary", &no_binary_diff,
 +                          "don't output binary diffs"),
 +              OPT_BOOLEAN(0, "ignore-if-in-upstream", &ignore_if_in_upstream,
 +                          "don't include a patch matching a commit upstream"),
 +              { OPTION_BOOLEAN, 'p', "no-stat", &use_patch_format, NULL,
 +                "show patch format instead of default (patch + stat)",
 +                PARSE_OPT_NONEG | PARSE_OPT_NOARG },
 +              OPT_GROUP("Messaging"),
 +              { OPTION_CALLBACK, 0, "add-header", NULL, "header",
 +                          "add email header", 0, header_callback },
 +              { OPTION_CALLBACK, 0, "to", NULL, "email", "add To: header",
 +                          0, to_callback },
 +              { OPTION_CALLBACK, 0, "cc", NULL, "email", "add Cc: header",
 +                          0, cc_callback },
 +              OPT_STRING(0, "in-reply-to", &in_reply_to, "message-id",
 +                          "make first mail a reply to <message-id>"),
 +              { OPTION_CALLBACK, 0, "attach", &rev, "boundary",
 +                          "attach the patch", PARSE_OPT_OPTARG,
 +                          attach_callback },
 +              { OPTION_CALLBACK, 0, "inline", &rev, "boundary",
 +                          "inline the patch",
 +                          PARSE_OPT_OPTARG | PARSE_OPT_NONEG,
 +                          inline_callback },
 +              { OPTION_CALLBACK, 0, "thread", &thread, "style",
 +                          "enable message threading, styles: shallow, deep",
 +                          PARSE_OPT_OPTARG, thread_callback },
 +              OPT_END()
 +      };
 +
 +      extra_hdr.strdup_strings = 1;
 +      extra_to.strdup_strings = 1;
 +      extra_cc.strdup_strings = 1;
 +      git_config(git_format_config, NULL);
 +      init_revisions(&rev, prefix);
 +      rev.commit_format = CMIT_FMT_EMAIL;
 +      rev.verbose_header = 1;
 +      rev.diff = 1;
 +      rev.combine_merges = 0;
 +      rev.ignore_merges = 1;
 +      DIFF_OPT_SET(&rev.diffopt, RECURSIVE);
 +      rev.subject_prefix = fmt_patch_subject_prefix;
 +      memset(&s_r_opt, 0, sizeof(s_r_opt));
 +      s_r_opt.def = "HEAD";
 +
 +      if (default_attach) {
 +              rev.mime_boundary = default_attach;
 +              rev.no_inline = 1;
 +      }
 +
 +      /*
 +       * Parse the arguments before setup_revisions(), or something
 +       * like "git format-patch -o a123 HEAD^.." may fail; a123 is
 +       * possibly a valid SHA1.
 +       */
 +      argc = parse_options(argc, argv, prefix, builtin_format_patch_options,
 +                           builtin_format_patch_usage,
 +                           PARSE_OPT_KEEP_ARGV0 | PARSE_OPT_KEEP_UNKNOWN |
 +                           PARSE_OPT_KEEP_DASHDASH);
 +
 +      if (do_signoff) {
 +              const char *committer;
 +              const char *endpos;
 +              committer = git_committer_info(IDENT_ERROR_ON_NO_NAME);
 +              endpos = strchr(committer, '>');
 +              if (!endpos)
 +                      die("bogus committer info %s", committer);
 +              add_signoff = xmemdupz(committer, endpos - committer + 1);
 +      }
 +
 +      for (i = 0; i < extra_hdr.nr; i++) {
 +              strbuf_addstr(&buf, extra_hdr.items[i].string);
 +              strbuf_addch(&buf, '\n');
 +      }
 +
 +      if (extra_to.nr)
 +              strbuf_addstr(&buf, "To: ");
 +      for (i = 0; i < extra_to.nr; i++) {
 +              if (i)
 +                      strbuf_addstr(&buf, "    ");
 +              strbuf_addstr(&buf, extra_to.items[i].string);
 +              if (i + 1 < extra_to.nr)
 +                      strbuf_addch(&buf, ',');
 +              strbuf_addch(&buf, '\n');
 +      }
 +
 +      if (extra_cc.nr)
 +              strbuf_addstr(&buf, "Cc: ");
 +      for (i = 0; i < extra_cc.nr; i++) {
 +              if (i)
 +                      strbuf_addstr(&buf, "    ");
 +              strbuf_addstr(&buf, extra_cc.items[i].string);
 +              if (i + 1 < extra_cc.nr)
 +                      strbuf_addch(&buf, ',');
 +              strbuf_addch(&buf, '\n');
 +      }
 +
 +      rev.extra_headers = strbuf_detach(&buf, NULL);
 +
 +      if (start_number < 0)
 +              start_number = 1;
 +
 +      /*
 +       * If numbered is set solely due to format.numbered in config,
 +       * and it would conflict with --keep-subject (-k) from the
 +       * command line, reset "numbered".
 +       */
 +      if (numbered && keep_subject && !numbered_cmdline_opt)
 +              numbered = 0;
 +
 +      if (numbered && keep_subject)
 +              die ("-n and -k are mutually exclusive.");
 +      if (keep_subject && subject_prefix)
 +              die ("--subject-prefix and -k are mutually exclusive.");
 +
 +      argc = setup_revisions(argc, argv, &rev, &s_r_opt);
 +      if (argc > 1)
 +              die ("unrecognized argument: %s", argv[1]);
 +
 +      if (rev.diffopt.output_format & DIFF_FORMAT_NAME)
 +              die("--name-only does not make sense");
 +      if (rev.diffopt.output_format & DIFF_FORMAT_NAME_STATUS)
 +              die("--name-status does not make sense");
 +      if (rev.diffopt.output_format & DIFF_FORMAT_CHECKDIFF)
 +              die("--check does not make sense");
 +
 +      if (!use_patch_format &&
 +              (!rev.diffopt.output_format ||
 +               rev.diffopt.output_format == DIFF_FORMAT_PATCH))
 +              rev.diffopt.output_format = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_SUMMARY;
 +
 +      /* Always generate a patch */
 +      rev.diffopt.output_format |= DIFF_FORMAT_PATCH;
 +
 +      if (!DIFF_OPT_TST(&rev.diffopt, TEXT) && !no_binary_diff)
 +              DIFF_OPT_SET(&rev.diffopt, BINARY);
 +
++      if (rev.show_notes)
++              init_display_notes(&rev.notes_opt);
++
 +      if (!use_stdout)
 +              output_directory = set_outdir(prefix, output_directory);
 +
 +      if (output_directory) {
 +              if (use_stdout)
 +                      die("standard output, or directory, which one?");
 +              if (mkdir(output_directory, 0777) < 0 && errno != EEXIST)
 +                      die_errno("Could not create directory '%s'",
 +                                output_directory);
 +      }
 +
 +      if (rev.pending.nr == 1) {
 +              if (rev.max_count < 0 && !rev.show_root_diff) {
 +                      /*
 +                       * This is traditional behaviour of "git format-patch
 +                       * origin" that prepares what the origin side still
 +                       * does not have.
 +                       */
 +                      rev.pending.objects[0].item->flags |= UNINTERESTING;
 +                      add_head_to_pending(&rev);
 +              }
 +              /*
 +               * Otherwise, it is "format-patch -22 HEAD", and/or
 +               * "format-patch --root HEAD".  The user wants
 +               * get_revision() to do the usual traversal.
 +               */
 +      }
 +
 +      /*
 +       * We cannot move this anywhere earlier because we do want to
 +       * know if --root was given explicitly from the command line.
 +       */
 +      rev.show_root_diff = 1;
 +
 +      if (cover_letter) {
 +              /* remember the range */
 +              int i;
 +              for (i = 0; i < rev.pending.nr; i++) {
 +                      struct object *o = rev.pending.objects[i].item;
 +                      if (!(o->flags & UNINTERESTING))
 +                              head = (struct commit *)o;
 +              }
 +              /* We can't generate a cover letter without any patches */
 +              if (!head)
 +                      return 0;
 +      }
 +
 +      if (ignore_if_in_upstream)
 +              get_patch_ids(&rev, &ids, prefix);
 +
 +      if (!use_stdout)
 +              realstdout = xfdopen(xdup(1), "w");
 +
 +      if (prepare_revision_walk(&rev))
 +              die("revision walk setup failed");
 +      rev.boundary = 1;
 +      while ((commit = get_revision(&rev)) != NULL) {
 +              if (commit->object.flags & BOUNDARY) {
 +                      boundary_count++;
 +                      origin = (boundary_count == 1) ? commit : NULL;
 +                      continue;
 +              }
 +
 +              /* ignore merges */
 +              if (commit->parents && commit->parents->next)
 +                      continue;
 +
 +              if (ignore_if_in_upstream &&
 +                              has_commit_patch_id(commit, &ids))
 +                      continue;
 +
 +              nr++;
 +              list = xrealloc(list, nr * sizeof(list[0]));
 +              list[nr - 1] = commit;
 +      }
 +      total = nr;
 +      if (!keep_subject && auto_number && total > 1)
 +              numbered = 1;
 +      if (numbered)
 +              rev.total = total + start_number - 1;
 +      if (in_reply_to || thread || cover_letter)
 +              rev.ref_message_ids = xcalloc(1, sizeof(struct string_list));
 +      if (in_reply_to) {
 +              const char *msgid = clean_message_id(in_reply_to);
 +              string_list_append(msgid, rev.ref_message_ids);
 +      }
 +      rev.numbered_files = numbered_files;
 +      rev.patch_suffix = fmt_patch_suffix;
 +      if (cover_letter) {
 +              if (thread)
 +                      gen_message_id(&rev, "cover");
 +              make_cover_letter(&rev, use_stdout, numbered, numbered_files,
 +                                origin, nr, list, head);
 +              total++;
 +              start_number--;
 +      }
 +      rev.add_signoff = add_signoff;
 +      while (0 <= --nr) {
 +              int shown;
 +              commit = list[nr];
 +              rev.nr = total - nr + (start_number - 1);
 +              /* Make the second and subsequent mails replies to the first */
 +              if (thread) {
 +                      /* Have we already had a message ID? */
 +                      if (rev.message_id) {
 +                              /*
 +                               * For deep threading: make every mail
 +                               * a reply to the previous one, no
 +                               * matter what other options are set.
 +                               *
 +                               * For shallow threading:
 +                               *
 +                               * Without --cover-letter and
 +                               * --in-reply-to, make every mail a
 +                               * reply to the one before.
 +                               *
 +                               * With --in-reply-to but no
 +                               * --cover-letter, make every mail a
 +                               * reply to the <reply-to>.
 +                               *
 +                               * With --cover-letter, make every
 +                               * mail but the cover letter a reply
 +                               * to the cover letter.  The cover
 +                               * letter is a reply to the
 +                               * --in-reply-to, if specified.
 +                               */
 +                              if (thread == THREAD_SHALLOW
 +                                  && rev.ref_message_ids->nr > 0
 +                                  && (!cover_letter || rev.nr > 1))
 +                                      free(rev.message_id);
 +                              else
 +                                      string_list_append(rev.message_id,
 +                                                         rev.ref_message_ids);
 +                      }
 +                      gen_message_id(&rev, sha1_to_hex(commit->object.sha1));
 +              }
 +
 +              if (!use_stdout && reopen_stdout(numbered_files ? NULL : commit,
 +                                               &rev))
 +                      die("Failed to create output files");
 +              shown = log_tree_commit(&rev, commit);
 +              free(commit->buffer);
 +              commit->buffer = NULL;
 +
 +              /* We put one extra blank line between formatted
 +               * patches and this flag is used by log-tree code
 +               * to see if it needs to emit a LF before showing
 +               * the log; when using one file per patch, we do
 +               * not want the extra blank line.
 +               */
 +              if (!use_stdout)
 +                      rev.shown_one = 0;
 +              if (shown) {
 +                      if (rev.mime_boundary)
 +                              printf("\n--%s%s--\n\n\n",
 +                                     mime_boundary_leader,
 +                                     rev.mime_boundary);
 +                      else
 +                              printf("-- \n%s\n\n", git_version_string);
 +              }
 +              if (!use_stdout)
 +                      fclose(stdout);
 +      }
 +      free(list);
 +      string_list_clear(&extra_to, 0);
 +      string_list_clear(&extra_cc, 0);
 +      string_list_clear(&extra_hdr, 0);
 +      if (ignore_if_in_upstream)
 +              free_patch_ids(&ids);
 +      return 0;
 +}
 +
 +static int add_pending_commit(const char *arg, struct rev_info *revs, int flags)
 +{
 +      unsigned char sha1[20];
 +      if (get_sha1(arg, sha1) == 0) {
 +              struct commit *commit = lookup_commit_reference(sha1);
 +              if (commit) {
 +                      commit->object.flags |= flags;
 +                      add_pending_object(revs, &commit->object, arg);
 +                      return 0;
 +              }
 +      }
 +      return -1;
 +}
 +
 +static const char cherry_usage[] =
 +"git cherry [-v] [<upstream> [<head> [<limit>]]]";
 +int cmd_cherry(int argc, const char **argv, const char *prefix)
 +{
 +      struct rev_info revs;
 +      struct patch_ids ids;
 +      struct commit *commit;
 +      struct commit_list *list = NULL;
 +      struct branch *current_branch;
 +      const char *upstream;
 +      const char *head = "HEAD";
 +      const char *limit = NULL;
 +      int verbose = 0;
 +
 +      if (argc > 1 && !strcmp(argv[1], "-v")) {
 +              verbose = 1;
 +              argc--;
 +              argv++;
 +      }
 +
 +      if (argc > 1 && !strcmp(argv[1], "-h"))
 +              usage(cherry_usage);
 +
 +      switch (argc) {
 +      case 4:
 +              limit = argv[3];
 +              /* FALLTHROUGH */
 +      case 3:
 +              head = argv[2];
 +              /* FALLTHROUGH */
 +      case 2:
 +              upstream = argv[1];
 +              break;
 +      default:
 +              current_branch = branch_get(NULL);
 +              if (!current_branch || !current_branch->merge
 +                                      || !current_branch->merge[0]
 +                                      || !current_branch->merge[0]->dst) {
 +                      fprintf(stderr, "Could not find a tracked"
 +                                      " remote branch, please"
 +                                      " specify <upstream> manually.\n");
 +                      usage(cherry_usage);
 +              }
 +
 +              upstream = current_branch->merge[0]->dst;
 +      }
 +
 +      init_revisions(&revs, prefix);
 +      revs.diff = 1;
 +      revs.combine_merges = 0;
 +      revs.ignore_merges = 1;
 +      DIFF_OPT_SET(&revs.diffopt, RECURSIVE);
 +
 +      if (add_pending_commit(head, &revs, 0))
 +              die("Unknown commit %s", head);
 +      if (add_pending_commit(upstream, &revs, UNINTERESTING))
 +              die("Unknown commit %s", upstream);
 +
 +      /* Don't say anything if head and upstream are the same. */
 +      if (revs.pending.nr == 2) {
 +              struct object_array_entry *o = revs.pending.objects;
 +              if (hashcmp(o[0].item->sha1, o[1].item->sha1) == 0)
 +                      return 0;
 +      }
 +
 +      get_patch_ids(&revs, &ids, prefix);
 +
 +      if (limit && add_pending_commit(limit, &revs, UNINTERESTING))
 +              die("Unknown commit %s", limit);
 +
 +      /* reverse the list of commits */
 +      if (prepare_revision_walk(&revs))
 +              die("revision walk setup failed");
 +      while ((commit = get_revision(&revs)) != NULL) {
 +              /* ignore merges */
 +              if (commit->parents && commit->parents->next)
 +                      continue;
 +
 +              commit_list_insert(commit, &list);
 +      }
 +
 +      while (list) {
 +              char sign = '+';
 +
 +              commit = list->item;
 +              if (has_commit_patch_id(commit, &ids))
 +                      sign = '-';
 +
 +              if (verbose) {
 +                      struct strbuf buf = STRBUF_INIT;
 +                      struct pretty_print_context ctx = {0};
 +                      pretty_print_commit(CMIT_FMT_ONELINE, commit,
 +                                          &buf, &ctx);
 +                      printf("%c %s %s\n", sign,
 +                             sha1_to_hex(commit->object.sha1), buf.buf);
 +                      strbuf_release(&buf);
 +              }
 +              else {
 +                      printf("%c %s\n", sign,
 +                             sha1_to_hex(commit->object.sha1));
 +              }
 +
 +              list = list->next;
 +      }
 +
 +      free_patch_ids(&ids);
 +      return 0;
 +}

diff --cc builtin/notes.c
index feb710ac4ada96339e42fe5838cf137e9ae4f12e,0000000000000000000000000000000000000000..4543d113113f90d7fb262b5fe54cbe5f6dfe29fd
mode 100644,000000..100644
--- 1/builtin/notes.c
--- /dev/null
+++ b/builtin/notes.c
@@@ -1,455 -1,0 +1,650 @@@
-           remove = 0, prune = 0, force = 0;
 +/*
 + * Builtin "git notes"
 + *
 + * Copyright (c) 2010 Johan Herland <johan@herland.net>
 + *
 + * Based on git-notes.sh by Johannes Schindelin,
 + * and builtin-tag.c by Kristian Høgsberg and Carlos Rica.
 + */
 +
 +#include "cache.h"
 +#include "builtin.h"
 +#include "notes.h"
 +#include "blob.h"
 +#include "commit.h"
 +#include "refs.h"
 +#include "exec_cmd.h"
 +#include "run-command.h"
 +#include "parse-options.h"
++#include "string-list.h"
 +
 +static const char * const git_notes_usage[] = {
 +      "git notes [list [<object>]]",
 +      "git notes add [-f] [-m <msg> | -F <file> | (-c | -C) <object>] [<object>]",
 +      "git notes copy [-f] <from-object> <to-object>",
 +      "git notes append [-m <msg> | -F <file> | (-c | -C) <object>] [<object>]",
 +      "git notes edit [<object>]",
 +      "git notes show [<object>]",
 +      "git notes remove [<object>]",
 +      "git notes prune",
 +      NULL
 +};
 +
 +static const char note_template[] =
 +      "\n"
 +      "#\n"
 +      "# Write/edit the notes for the following object:\n"
 +      "#\n";
 +
 +struct msg_arg {
 +      int given;
 +      int use_editor;
 +      struct strbuf buf;
 +};
 +
 +static int list_each_note(const unsigned char *object_sha1,
 +              const unsigned char *note_sha1, char *note_path,
 +              void *cb_data)
 +{
 +      printf("%s %s\n", sha1_to_hex(note_sha1), sha1_to_hex(object_sha1));
 +      return 0;
 +}
 +
 +static void write_note_data(int fd, const unsigned char *sha1)
 +{
 +      unsigned long size;
 +      enum object_type type;
 +      char *buf = read_sha1_file(sha1, &type, &size);
 +      if (buf) {
 +              if (size)
 +                      write_or_die(fd, buf, size);
 +              free(buf);
 +      }
 +}
 +
 +static void write_commented_object(int fd, const unsigned char *object)
 +{
 +      const char *show_args[5] =
 +              {"show", "--stat", "--no-notes", sha1_to_hex(object), NULL};
 +      struct child_process show;
 +      struct strbuf buf = STRBUF_INIT;
 +      FILE *show_out;
 +
 +      /* Invoke "git show --stat --no-notes $object" */
 +      memset(&show, 0, sizeof(show));
 +      show.argv = show_args;
 +      show.no_stdin = 1;
 +      show.out = -1;
 +      show.err = 0;
 +      show.git_cmd = 1;
 +      if (start_command(&show))
 +              die("unable to start 'show' for object '%s'",
 +                  sha1_to_hex(object));
 +
 +      /* Open the output as FILE* so strbuf_getline() can be used. */
 +      show_out = xfdopen(show.out, "r");
 +      if (show_out == NULL)
 +              die_errno("can't fdopen 'show' output fd");
 +
 +      /* Prepend "# " to each output line and write result to 'fd' */
 +      while (strbuf_getline(&buf, show_out, '\n') != EOF) {
 +              write_or_die(fd, "# ", 2);
 +              write_or_die(fd, buf.buf, buf.len);
 +              write_or_die(fd, "\n", 1);
 +      }
 +      strbuf_release(&buf);
 +      if (fclose(show_out))
 +              die_errno("failed to close pipe to 'show' for object '%s'",
 +                        sha1_to_hex(object));
 +      if (finish_command(&show))
 +              die("failed to finish 'show' for object '%s'",
 +                  sha1_to_hex(object));
 +}
 +
 +static void create_note(const unsigned char *object, struct msg_arg *msg,
 +                      int append_only, const unsigned char *prev,
 +                      unsigned char *result)
 +{
 +      char *path = NULL;
 +
 +      if (msg->use_editor || !msg->given) {
 +              int fd;
 +
 +              /* write the template message before editing: */
 +              path = git_pathdup("NOTES_EDITMSG");
 +              fd = open(path, O_CREAT | O_TRUNC | O_WRONLY, 0600);
 +              if (fd < 0)
 +                      die_errno("could not create file '%s'", path);
 +
 +              if (msg->given)
 +                      write_or_die(fd, msg->buf.buf, msg->buf.len);
 +              else if (prev && !append_only)
 +                      write_note_data(fd, prev);
 +              write_or_die(fd, note_template, strlen(note_template));
 +
 +              write_commented_object(fd, object);
 +
 +              close(fd);
 +              strbuf_reset(&(msg->buf));
 +
 +              if (launch_editor(path, &(msg->buf), NULL)) {
 +                      die("Please supply the note contents using either -m" \
 +                          " or -F option");
 +              }
 +              stripspace(&(msg->buf), 1);
 +      }
 +
 +      if (prev && append_only) {
 +              /* Append buf to previous note contents */
 +              unsigned long size;
 +              enum object_type type;
 +              char *prev_buf = read_sha1_file(prev, &type, &size);
 +
 +              strbuf_grow(&(msg->buf), size + 1);
 +              if (msg->buf.len && prev_buf && size)
 +                      strbuf_insert(&(msg->buf), 0, "\n", 1);
 +              if (prev_buf && size)
 +                      strbuf_insert(&(msg->buf), 0, prev_buf, size);
 +              free(prev_buf);
 +      }
 +
 +      if (!msg->buf.len) {
 +              fprintf(stderr, "Removing note for object %s\n",
 +                      sha1_to_hex(object));
 +              hashclr(result);
 +      } else {
 +              if (write_sha1_file(msg->buf.buf, msg->buf.len, blob_type, result)) {
 +                      error("unable to write note object");
 +                      if (path)
 +                              error("The note contents has been left in %s",
 +                                    path);
 +                      exit(128);
 +              }
 +      }
 +
 +      if (path) {
 +              unlink_or_warn(path);
 +              free(path);
 +      }
 +}
 +
 +static int parse_msg_arg(const struct option *opt, const char *arg, int unset)
 +{
 +      struct msg_arg *msg = opt->value;
 +
 +      strbuf_grow(&(msg->buf), strlen(arg) + 2);
 +      if (msg->buf.len)
 +              strbuf_addch(&(msg->buf), '\n');
 +      strbuf_addstr(&(msg->buf), arg);
 +      stripspace(&(msg->buf), 0);
 +
 +      msg->given = 1;
 +      return 0;
 +}
 +
 +static int parse_file_arg(const struct option *opt, const char *arg, int unset)
 +{
 +      struct msg_arg *msg = opt->value;
 +
 +      if (msg->buf.len)
 +              strbuf_addch(&(msg->buf), '\n');
 +      if (!strcmp(arg, "-")) {
 +              if (strbuf_read(&(msg->buf), 0, 1024) < 0)
 +                      die_errno("cannot read '%s'", arg);
 +      } else if (strbuf_read_file(&(msg->buf), arg, 1024) < 0)
 +              die_errno("could not open or read '%s'", arg);
 +      stripspace(&(msg->buf), 0);
 +
 +      msg->given = 1;
 +      return 0;
 +}
 +
 +static int parse_reuse_arg(const struct option *opt, const char *arg, int unset)
 +{
 +      struct msg_arg *msg = opt->value;
 +      char *buf;
 +      unsigned char object[20];
 +      enum object_type type;
 +      unsigned long len;
 +
 +      if (msg->buf.len)
 +              strbuf_addch(&(msg->buf), '\n');
 +
 +      if (get_sha1(arg, object))
 +              die("Failed to resolve '%s' as a valid ref.", arg);
 +      if (!(buf = read_sha1_file(object, &type, &len)) || !len) {
 +              free(buf);
 +              die("Failed to read object '%s'.", arg);;
 +      }
 +      strbuf_add(&(msg->buf), buf, len);
 +      free(buf);
 +
 +      msg->given = 1;
 +      return 0;
 +}
 +
 +static int parse_reedit_arg(const struct option *opt, const char *arg, int unset)
 +{
 +      struct msg_arg *msg = opt->value;
 +      msg->use_editor = 1;
 +      return parse_reuse_arg(opt, arg, unset);
 +}
 +
 +int commit_notes(struct notes_tree *t, const char *msg)
 +{
 +      struct commit_list *parent;
 +      unsigned char tree_sha1[20], prev_commit[20], new_commit[20];
 +      struct strbuf buf = STRBUF_INIT;
 +
 +      if (!t)
 +              t = &default_notes_tree;
 +      if (!t->initialized || !t->ref || !*t->ref)
 +              die("Cannot commit uninitialized/unreferenced notes tree");
++      if (!t->dirty)
++              return 0; /* don't have to commit an unchanged tree */
 +
 +      /* Prepare commit message and reflog message */
 +      strbuf_addstr(&buf, "notes: "); /* commit message starts at index 7 */
 +      strbuf_addstr(&buf, msg);
 +      if (buf.buf[buf.len - 1] != '\n')
 +              strbuf_addch(&buf, '\n'); /* Make sure msg ends with newline */
 +
 +      /* Convert notes tree to tree object */
 +      if (write_notes_tree(t, tree_sha1))
 +              die("Failed to write current notes tree to database");
 +
 +      /* Create new commit for the tree object */
 +      if (!read_ref(t->ref, prev_commit)) { /* retrieve parent commit */
 +              parent = xmalloc(sizeof(*parent));
 +              parent->item = lookup_commit(prev_commit);
 +              parent->next = NULL;
 +      } else {
 +              hashclr(prev_commit);
 +              parent = NULL;
 +      }
 +      if (commit_tree(buf.buf + 7, tree_sha1, parent, new_commit, NULL))
 +              die("Failed to commit notes tree to database");
 +
 +      /* Update notes ref with new commit */
 +      update_ref(buf.buf, t->ref, new_commit, prev_commit, 0, DIE_ON_ERR);
 +
 +      strbuf_release(&buf);
 +      return 0;
 +}
 +
++
++combine_notes_fn *parse_combine_notes_fn(const char *v)
++{
++      if (!strcasecmp(v, "overwrite"))
++              return combine_notes_overwrite;
++      else if (!strcasecmp(v, "ignore"))
++              return combine_notes_ignore;
++      else if (!strcasecmp(v, "concatenate"))
++              return combine_notes_concatenate;
++      else
++              return NULL;
++}
++
++static int notes_rewrite_config(const char *k, const char *v, void *cb)
++{
++      struct notes_rewrite_cfg *c = cb;
++      if (!prefixcmp(k, "notes.rewrite.") && !strcmp(k+14, c->cmd)) {
++              c->enabled = git_config_bool(k, v);
++              return 0;
++      } else if (!c->mode_from_env && !strcmp(k, "notes.rewritemode")) {
++              if (!v)
++                      config_error_nonbool(k);
++              c->combine = parse_combine_notes_fn(v);
++              if (!c->combine) {
++                      error("Bad notes.rewriteMode value: '%s'", v);
++                      return 1;
++              }
++              return 0;
++      } else if (!c->refs_from_env && !strcmp(k, "notes.rewriteref")) {
++              /* note that a refs/ prefix is implied in the
++               * underlying for_each_glob_ref */
++              if (!prefixcmp(v, "refs/notes/"))
++                      string_list_add_refs_by_glob(c->refs, v);
++              else
++                      warning("Refusing to rewrite notes in %s"
++                              " (outside of refs/notes/)", v);
++              return 0;
++      }
++
++      return 0;
++}
++
++
++struct notes_rewrite_cfg *init_copy_notes_for_rewrite(const char *cmd)
++{
++      struct notes_rewrite_cfg *c = xmalloc(sizeof(struct notes_rewrite_cfg));
++      const char *rewrite_mode_env = getenv(GIT_NOTES_REWRITE_MODE_ENVIRONMENT);
++      const char *rewrite_refs_env = getenv(GIT_NOTES_REWRITE_REF_ENVIRONMENT);
++      c->cmd = cmd;
++      c->enabled = 1;
++      c->combine = combine_notes_concatenate;
++      c->refs = xcalloc(1, sizeof(struct string_list));
++      c->refs->strdup_strings = 1;
++      c->refs_from_env = 0;
++      c->mode_from_env = 0;
++      if (rewrite_mode_env) {
++              c->mode_from_env = 1;
++              c->combine = parse_combine_notes_fn(rewrite_mode_env);
++              if (!c->combine)
++                      error("Bad " GIT_NOTES_REWRITE_MODE_ENVIRONMENT
++                            " value: '%s'", rewrite_mode_env);
++      }
++      if (rewrite_refs_env) {
++              c->refs_from_env = 1;
++              string_list_add_refs_from_colon_sep(c->refs, rewrite_refs_env);
++      }
++      git_config(notes_rewrite_config, c);
++      if (!c->enabled || !c->refs->nr) {
++              string_list_clear(c->refs, 0);
++              free(c->refs);
++              free(c);
++              return NULL;
++      }
++      c->trees = load_notes_trees(c->refs);
++      string_list_clear(c->refs, 0);
++      free(c->refs);
++      return c;
++}
++
++int copy_note_for_rewrite(struct notes_rewrite_cfg *c,
++                        const unsigned char *from_obj, const unsigned char *to_obj)
++{
++      int ret = 0;
++      int i;
++      for (i = 0; c->trees[i]; i++)
++              ret = copy_note(c->trees[i], from_obj, to_obj, 1, c->combine) || ret;
++      return ret;
++}
++
++void finish_copy_notes_for_rewrite(struct notes_rewrite_cfg *c)
++{
++      int i;
++      for (i = 0; c->trees[i]; i++) {
++              commit_notes(c->trees[i], "Notes added by 'git notes copy'");
++              free_notes(c->trees[i]);
++      }
++      free(c->trees);
++      free(c);
++}
++
++int notes_copy_from_stdin(int force, const char *rewrite_cmd)
++{
++      struct strbuf buf = STRBUF_INIT;
++      struct notes_rewrite_cfg *c = NULL;
++      struct notes_tree *t;
++      int ret = 0;
++
++      if (rewrite_cmd) {
++              c = init_copy_notes_for_rewrite(rewrite_cmd);
++              if (!c)
++                      return 0;
++      } else {
++              init_notes(NULL, NULL, NULL, 0);
++              t = &default_notes_tree;
++      }
++
++      while (strbuf_getline(&buf, stdin, '\n') != EOF) {
++              unsigned char from_obj[20], to_obj[20];
++              struct strbuf **split;
++              int err;
++
++              split = strbuf_split(&buf, ' ');
++              if (!split[0] || !split[1])
++                      die("Malformed input line: '%s'.", buf.buf);
++              strbuf_rtrim(split[0]);
++              strbuf_rtrim(split[1]);
++              if (get_sha1(split[0]->buf, from_obj))
++                      die("Failed to resolve '%s' as a valid ref.", split[0]->buf);
++              if (get_sha1(split[1]->buf, to_obj))
++                      die("Failed to resolve '%s' as a valid ref.", split[1]->buf);
++
++              if (rewrite_cmd)
++                      err = copy_note_for_rewrite(c, from_obj, to_obj);
++              else
++                      err = copy_note(t, from_obj, to_obj, force,
++                                      combine_notes_overwrite);
++
++              if (err) {
++                      error("Failed to copy notes from '%s' to '%s'",
++                            split[0]->buf, split[1]->buf);
++                      ret = 1;
++              }
++
++              strbuf_list_free(split);
++      }
++
++      if (!rewrite_cmd) {
++              commit_notes(t, "Notes added by 'git notes copy'");
++              free_notes(t);
++      } else {
++              finish_copy_notes_for_rewrite(c);
++      }
++      return ret;
++}
++
 +int cmd_notes(int argc, const char **argv, const char *prefix)
 +{
 +      struct notes_tree *t;
 +      unsigned char object[20], from_obj[20], new_note[20];
 +      const unsigned char *note;
 +      const char *object_ref;
 +      char logmsg[100];
 +
 +      int list = 0, add = 0, copy = 0, append = 0, edit = 0, show = 0,
++          remove = 0, prune = 0, force = 0, from_stdin = 0;
 +      int given_object = 0, i = 1, retval = 0;
 +      struct msg_arg msg = { 0, 0, STRBUF_INIT };
++      const char *rewrite_cmd = NULL;
++      const char *override_notes_ref = NULL;
 +      struct option options[] = {
 +              OPT_GROUP("Notes contents options"),
 +              { OPTION_CALLBACK, 'm', "message", &msg, "MSG",
 +                      "note contents as a string", PARSE_OPT_NONEG,
 +                      parse_msg_arg},
 +              { OPTION_CALLBACK, 'F', "file", &msg, "FILE",
 +                      "note contents in a file", PARSE_OPT_NONEG,
 +                      parse_file_arg},
 +              { OPTION_CALLBACK, 'c', "reedit-message", &msg, "OBJECT",
 +                      "reuse and edit specified note object", PARSE_OPT_NONEG,
 +                      parse_reedit_arg},
 +              { OPTION_CALLBACK, 'C', "reuse-message", &msg, "OBJECT",
 +                      "reuse specified note object", PARSE_OPT_NONEG,
 +                      parse_reuse_arg},
 +              OPT_GROUP("Other options"),
 +              OPT_BOOLEAN('f', "force", &force, "replace existing notes"),
++              OPT_BOOLEAN(0, "stdin", &from_stdin, "read objects from stdin"),
++              OPT_STRING(0, "ref", &override_notes_ref, "notes_ref",
++                         "use notes from <notes_ref>"),
++              OPT_STRING(0, "for-rewrite", &rewrite_cmd, "command",
++                         "load rewriting config for <command> (implies --stdin)"),
 +              OPT_END()
 +      };
 +
 +      git_config(git_default_config, NULL);
 +
 +      argc = parse_options(argc, argv, prefix, options, git_notes_usage, 0);
 +
++      if (override_notes_ref) {
++              struct strbuf sb = STRBUF_INIT;
++              if (!prefixcmp(override_notes_ref, "refs/notes/"))
++                      /* we're happy */;
++              else if (!prefixcmp(override_notes_ref, "notes/"))
++                      strbuf_addstr(&sb, "refs/");
++              else
++                      strbuf_addstr(&sb, "refs/notes/");
++              strbuf_addstr(&sb, override_notes_ref);
++              setenv("GIT_NOTES_REF", sb.buf, 1);
++              strbuf_release(&sb);
++      }
++
 +      if (argc && !strcmp(argv[0], "list"))
 +              list = 1;
 +      else if (argc && !strcmp(argv[0], "add"))
 +              add = 1;
 +      else if (argc && !strcmp(argv[0], "copy"))
 +              copy = 1;
 +      else if (argc && !strcmp(argv[0], "append"))
 +              append = 1;
 +      else if (argc && !strcmp(argv[0], "edit"))
 +              edit = 1;
 +      else if (argc && !strcmp(argv[0], "show"))
 +              show = 1;
 +      else if (argc && !strcmp(argv[0], "remove"))
 +              remove = 1;
 +      else if (argc && !strcmp(argv[0], "prune"))
 +              prune = 1;
 +      else if (!argc) {
 +              list = 1; /* Default to 'list' if no other subcommand given */
 +              i = 0;
 +      }
 +
 +      if (list + add + copy + append + edit + show + remove + prune != 1)
 +              usage_with_options(git_notes_usage, options);
 +
 +      if (msg.given && !(add || append || edit)) {
 +              error("cannot use -m/-F/-c/-C options with %s subcommand.",
 +                    argv[0]);
 +              usage_with_options(git_notes_usage, options);
 +      }
 +
 +      if (msg.given && edit) {
 +              fprintf(stderr, "The -m/-F/-c/-C options have been deprecated "
 +                      "for the 'edit' subcommand.\n"
 +                      "Please use 'git notes add -f -m/-F/-c/-C' instead.\n");
 +      }
 +
 +      if (force && !(add || copy)) {
 +              error("cannot use -f option with %s subcommand.", argv[0]);
 +              usage_with_options(git_notes_usage, options);
 +      }
 +
++      if (!copy && rewrite_cmd) {
++              error("cannot use --for-rewrite with %s subcommand.", argv[0]);
++              usage_with_options(git_notes_usage, options);
++      }
++      if (!copy && from_stdin) {
++              error("cannot use --stdin with %s subcommand.", argv[0]);
++              usage_with_options(git_notes_usage, options);
++      }
++
 +      if (copy) {
 +              const char *from_ref;
++              if (from_stdin || rewrite_cmd) {
++                      if (argc > 1) {
++                              error("too many parameters");
++                              usage_with_options(git_notes_usage, options);
++                      } else {
++                              return notes_copy_from_stdin(force, rewrite_cmd);
++                      }
++              }
 +              if (argc < 3) {
 +                      error("too few parameters");
 +                      usage_with_options(git_notes_usage, options);
 +              }
 +              from_ref = argv[i++];
 +              if (get_sha1(from_ref, from_obj))
 +                      die("Failed to resolve '%s' as a valid ref.", from_ref);
 +      }
 +
 +      given_object = argc > i;
 +      object_ref = given_object ? argv[i++] : "HEAD";
 +
 +      if (argc > i || (prune && given_object)) {
 +              error("too many parameters");
 +              usage_with_options(git_notes_usage, options);
 +      }
 +
 +      if (get_sha1(object_ref, object))
 +              die("Failed to resolve '%s' as a valid ref.", object_ref);
 +
 +      init_notes(NULL, NULL, NULL, 0);
 +      t = &default_notes_tree;
 +
 +      if (prefixcmp(t->ref, "refs/notes/"))
 +              die("Refusing to %s notes in %s (outside of refs/notes/)",
 +                  argv[0], t->ref);
 +
 +      note = get_note(t, object);
 +
 +      /* list command */
 +
 +      if (list) {
 +              if (given_object) {
 +                      if (note) {
 +                              puts(sha1_to_hex(note));
 +                              goto end;
 +                      }
 +              } else {
 +                      retval = for_each_note(t, 0, list_each_note, NULL);
 +                      goto end;
 +              }
 +      }
 +
 +      /* show command */
 +
 +      if ((list || show) && !note) {
 +              error("No note found for object %s.", sha1_to_hex(object));
 +              retval = 1;
 +              goto end;
 +      } else if (show) {
 +              const char *show_args[3] = {"show", sha1_to_hex(note), NULL};
 +              retval = execv_git_cmd(show_args);
 +              goto end;
 +      }
 +
 +      /* add/append/edit/remove/prune command */
 +
 +      if ((add || copy) && note) {
 +              if (!force) {
 +                      error("Cannot %s notes. Found existing notes for object"
 +                            " %s. Use '-f' to overwrite existing notes",
 +                            argv[0], sha1_to_hex(object));
 +                      retval = 1;
 +                      goto end;
 +              }
 +              fprintf(stderr, "Overwriting existing notes for object %s\n",
 +                      sha1_to_hex(object));
 +      }
 +
 +      if (remove) {
 +              msg.given = 1;
 +              msg.use_editor = 0;
 +              strbuf_reset(&(msg.buf));
 +      }
 +
 +      if (prune) {
 +              hashclr(new_note);
 +              prune_notes(t);
 +              goto commit;
 +      } else if (copy) {
 +              const unsigned char *from_note = get_note(t, from_obj);
 +              if (!from_note) {
 +                      error("Missing notes on source object %s. Cannot copy.",
 +                            sha1_to_hex(from_obj));
 +                      retval = 1;
 +                      goto end;
 +              }
 +              hashcpy(new_note, from_note);
 +      } else
 +              create_note(object, &msg, append, note, new_note);
 +
 +      if (is_null_sha1(new_note))
 +              remove_note(t, object);
 +      else
 +              add_note(t, object, new_note, combine_notes_overwrite);
 +
 +commit:
 +      snprintf(logmsg, sizeof(logmsg), "Notes %s by 'git notes %s'",
 +               is_null_sha1(new_note) ? "removed" : "added", argv[0]);
 +      commit_notes(t, logmsg);
 +
 +end:
 +      free_notes(t);
 +      strbuf_release(&(msg.buf));
 +      return retval;
 +}

diff --cc cache.h
index f62db0bd7e8f79f5d8a31e61c6164344bad10b65,a04f37f14be608bb9b8edb5580a4473e20a9d582..2928107bb135004e11f6a11a625067545680b62a
--- 1/cache.h
--- 2/cache.h
+++ b/cache.h
@@@ -387,16 -385,10 +387,19 @@@ static inline enum object_type object_t
  #define ATTRIBUTE_MACRO_PREFIX "[attr]"
  #define GIT_NOTES_REF_ENVIRONMENT "GIT_NOTES_REF"
  #define GIT_NOTES_DEFAULT_REF "refs/notes/commits"
+ #define GIT_NOTES_DISPLAY_REF_ENVIRONMENT "GIT_NOTES_DISPLAY_REF"
+ #define GIT_NOTES_REWRITE_REF_ENVIRONMENT "GIT_NOTES_REWRITE_REF"
+ #define GIT_NOTES_REWRITE_MODE_ENVIRONMENT "GIT_NOTES_REWRITE_MODE"
  
 +/*
 + * Repository-local GIT_* environment variables
 + * The array is NULL-terminated to simplify its usage in contexts such
 + * environment creation or simple walk of the list.
 + * The number of non-NULL entries is available as a macro.
 + */
 +#define LOCAL_REPO_ENV_SIZE 8
 +extern const char *const local_repo_env[LOCAL_REPO_ENV_SIZE + 1];
 +
  extern int is_bare_repository_cfg;
  extern int is_bare_repository(void);
  extern int is_inside_git_dir(void);

diff --cc git-am.sh
index 50a292a7da58aab3b5ce62347b02dee35395da2a,7644474bcabc191ef11ce6b885a62794ec730a9c..1056075545ad3e5e42626d167c91c1deada6186b
--- 1/git-am.sh
--- 2/git-am.sh
+++ b/git-am.sh
@@@ -791,5 -780,13 +797,12 @@@ d
        go_next
  done
  
 -git gc --auto
 -
+ if test -s "$dotest"/rewritten; then
+     git notes copy --for-rewrite=rebase < "$dotest"/rewritten
+     if test -x "$GIT_DIR"/hooks/post-rewrite; then
+       "$GIT_DIR"/hooks/post-rewrite rebase < "$dotest"/rewritten
+     fi
+ fi
+ 
  rm -fr "$dotest"
 +git gc --auto

diff --cc git-rebase--interactive.sh
Simple merge

diff --cc git-rebase.sh
Simple merge

diff --cc notes.c
index 07941b72352167fac9ce1b69f59cf377294a3c33,0261e7898a5ed6412f92a614818f75c53253b280..e425e198278bfb5c6a039dc88825568f1518e875
--- 1/notes.c
--- 2/notes.c
+++ b/notes.c
@@@ -891,9 -1028,10 +1028,10 @@@ void remove_note(struct notes_tree *t, 
        if (!t)
                t = &default_notes_tree;
        assert(t->initialized);
+       t->dirty = 1;
        hashcpy(l.key_sha1, object_sha1);
        hashclr(l.val_sha1);
 -      return note_tree_remove(t, t->root, 0, &l);
 +      note_tree_remove(t, t->root, 0, &l);
  }
  
  const unsigned char *get_note(struct notes_tree *t,

diff --cc refs.c
Simple merge

diff --cc revision.c
Simple merge

diff --cc revision.h
Simple merge

diff --cc t/t3301-notes.sh
Simple merge

diff --cc t/t3400-rebase.sh
Simple merge

diff --cc t/test-lib.sh
Simple merge