From: Junio C Hamano <gitster@pobox.com>
Date: Sun, 18 Dec 2011 08:27:59 +0000 (-0800)
Subject: Update jk/maint-strbuf-missing-init to builtin/ rename
X-Git-Tag: v1.7.8.2~5^2
X-Git-Url: https://git.tokkee.org/?a=commitdiff_plain;h=03f94ae9f909952ed5a78917ab319a312889354b;p=git.git

Update jk/maint-strbuf-missing-init to builtin/ rename
---

03f94ae9f909952ed5a78917ab319a312889354b
diff --cc builtin/commit.c
index 000000000,55676fd87..564042de3
mode 000000,100644..100644
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@@ -1,0 -1,1310 +1,1310 @@@
+ /*
+  * 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 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 struct strbuf message = STRBUF_INIT;
+ 
+ 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"),
+ 	{ 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();
+ 	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);
+ }
+ 
+ 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 (!quiet)
+ 		print_summary(prefix, commit_sha1);
+ 
+ 	return 0;
+ }
diff --cc builtin/merge.c
index 000000000,3aaec7bed..c6e3e7fda
mode 000000,100644..100644
--- a/builtin/merge.c
+++ b/builtin/merge.c
@@@ -1,0 -1,1292 +1,1292 @@@
+ /*
+  * Builtin "git merge"
+  *
+  * Copyright (c) 2008 Miklos Vajna <vmiklos@frugalware.org>
+  *
+  * Based on git-merge.sh by Junio C Hamano.
+  */
+ 
+ #include "cache.h"
+ #include "parse-options.h"
+ #include "builtin.h"
+ #include "run-command.h"
+ #include "diff.h"
+ #include "refs.h"
+ #include "commit.h"
+ #include "diffcore.h"
+ #include "revision.h"
+ #include "unpack-trees.h"
+ #include "cache-tree.h"
+ #include "dir.h"
+ #include "utf8.h"
+ #include "log-tree.h"
+ #include "color.h"
+ #include "rerere.h"
+ #include "help.h"
+ #include "merge-recursive.h"
+ #include "resolve-undo.h"
+ 
+ #define DEFAULT_TWOHEAD (1<<0)
+ #define DEFAULT_OCTOPUS (1<<1)
+ #define NO_FAST_FORWARD (1<<2)
+ #define NO_TRIVIAL      (1<<3)
+ 
+ struct strategy {
+ 	const char *name;
+ 	unsigned attr;
+ };
+ 
+ static const char * const builtin_merge_usage[] = {
+ 	"git merge [options] <remote>...",
+ 	"git merge [options] <msg> HEAD <remote>",
+ 	NULL
+ };
+ 
+ static int show_diffstat = 1, option_log, squash;
+ static int option_commit = 1, allow_fast_forward = 1;
+ static int fast_forward_only;
+ static int allow_trivial = 1, have_message;
 -static struct strbuf merge_msg;
++static struct strbuf merge_msg = STRBUF_INIT;
+ static struct commit_list *remoteheads;
+ static unsigned char head[20], stash[20];
+ static struct strategy **use_strategies;
+ static size_t use_strategies_nr, use_strategies_alloc;
+ static const char **xopts;
+ static size_t xopts_nr, xopts_alloc;
+ static const char *branch;
+ static int verbosity;
+ static int allow_rerere_auto;
+ 
+ static struct strategy all_strategy[] = {
+ 	{ "recursive",  DEFAULT_TWOHEAD | NO_TRIVIAL },
+ 	{ "octopus",    DEFAULT_OCTOPUS },
+ 	{ "resolve",    0 },
+ 	{ "ours",       NO_FAST_FORWARD | NO_TRIVIAL },
+ 	{ "subtree",    NO_FAST_FORWARD | NO_TRIVIAL },
+ };
+ 
+ static const char *pull_twohead, *pull_octopus;
+ 
+ static int option_parse_message(const struct option *opt,
+ 				const char *arg, int unset)
+ {
+ 	struct strbuf *buf = opt->value;
+ 
+ 	if (unset)
+ 		strbuf_setlen(buf, 0);
+ 	else if (arg) {
+ 		strbuf_addf(buf, "%s%s", buf->len ? "\n\n" : "", arg);
+ 		have_message = 1;
+ 	} else
+ 		return error("switch `m' requires a value");
+ 	return 0;
+ }
+ 
+ static struct strategy *get_strategy(const char *name)
+ {
+ 	int i;
+ 	struct strategy *ret;
+ 	static struct cmdnames main_cmds, other_cmds;
+ 	static int loaded;
+ 
+ 	if (!name)
+ 		return NULL;
+ 
+ 	for (i = 0; i < ARRAY_SIZE(all_strategy); i++)
+ 		if (!strcmp(name, all_strategy[i].name))
+ 			return &all_strategy[i];
+ 
+ 	if (!loaded) {
+ 		struct cmdnames not_strategies;
+ 		loaded = 1;
+ 
+ 		memset(&not_strategies, 0, sizeof(struct cmdnames));
+ 		load_command_list("git-merge-", &main_cmds, &other_cmds);
+ 		for (i = 0; i < main_cmds.cnt; i++) {
+ 			int j, found = 0;
+ 			struct cmdname *ent = main_cmds.names[i];
+ 			for (j = 0; j < ARRAY_SIZE(all_strategy); j++)
+ 				if (!strncmp(ent->name, all_strategy[j].name, ent->len)
+ 						&& !all_strategy[j].name[ent->len])
+ 					found = 1;
+ 			if (!found)
+ 				add_cmdname(&not_strategies, ent->name, ent->len);
+ 		}
+ 		exclude_cmds(&main_cmds, &not_strategies);
+ 	}
+ 	if (!is_in_cmdlist(&main_cmds, name) && !is_in_cmdlist(&other_cmds, name)) {
+ 		fprintf(stderr, "Could not find merge strategy '%s'.\n", name);
+ 		fprintf(stderr, "Available strategies are:");
+ 		for (i = 0; i < main_cmds.cnt; i++)
+ 			fprintf(stderr, " %s", main_cmds.names[i]->name);
+ 		fprintf(stderr, ".\n");
+ 		if (other_cmds.cnt) {
+ 			fprintf(stderr, "Available custom strategies are:");
+ 			for (i = 0; i < other_cmds.cnt; i++)
+ 				fprintf(stderr, " %s", other_cmds.names[i]->name);
+ 			fprintf(stderr, ".\n");
+ 		}
+ 		exit(1);
+ 	}
+ 
+ 	ret = xcalloc(1, sizeof(struct strategy));
+ 	ret->name = xstrdup(name);
+ 	return ret;
+ }
+ 
+ static void append_strategy(struct strategy *s)
+ {
+ 	ALLOC_GROW(use_strategies, use_strategies_nr + 1, use_strategies_alloc);
+ 	use_strategies[use_strategies_nr++] = s;
+ }
+ 
+ static int option_parse_strategy(const struct option *opt,
+ 				 const char *name, int unset)
+ {
+ 	if (unset)
+ 		return 0;
+ 
+ 	append_strategy(get_strategy(name));
+ 	return 0;
+ }
+ 
+ static int option_parse_x(const struct option *opt,
+ 			  const char *arg, int unset)
+ {
+ 	if (unset)
+ 		return 0;
+ 
+ 	ALLOC_GROW(xopts, xopts_nr + 1, xopts_alloc);
+ 	xopts[xopts_nr++] = xstrdup(arg);
+ 	return 0;
+ }
+ 
+ static int option_parse_n(const struct option *opt,
+ 			  const char *arg, int unset)
+ {
+ 	show_diffstat = unset;
+ 	return 0;
+ }
+ 
+ static struct option builtin_merge_options[] = {
+ 	{ OPTION_CALLBACK, 'n', NULL, NULL, NULL,
+ 		"do not show a diffstat at the end of the merge",
+ 		PARSE_OPT_NOARG, option_parse_n },
+ 	OPT_BOOLEAN(0, "stat", &show_diffstat,
+ 		"show a diffstat at the end of the merge"),
+ 	OPT_BOOLEAN(0, "summary", &show_diffstat, "(synonym to --stat)"),
+ 	OPT_BOOLEAN(0, "log", &option_log,
+ 		"add list of one-line log to merge commit message"),
+ 	OPT_BOOLEAN(0, "squash", &squash,
+ 		"create a single commit instead of doing a merge"),
+ 	OPT_BOOLEAN(0, "commit", &option_commit,
+ 		"perform a commit if the merge succeeds (default)"),
+ 	OPT_BOOLEAN(0, "ff", &allow_fast_forward,
+ 		"allow fast-forward (default)"),
+ 	OPT_BOOLEAN(0, "ff-only", &fast_forward_only,
+ 		"abort if fast-forward is not possible"),
+ 	OPT_RERERE_AUTOUPDATE(&allow_rerere_auto),
+ 	OPT_CALLBACK('s', "strategy", &use_strategies, "strategy",
+ 		"merge strategy to use", option_parse_strategy),
+ 	OPT_CALLBACK('X', "strategy-option", &xopts, "option=value",
+ 		"option for selected merge strategy", option_parse_x),
+ 	OPT_CALLBACK('m', "message", &merge_msg, "message",
+ 		"message to be used for the merge commit (if any)",
+ 		option_parse_message),
+ 	OPT__VERBOSITY(&verbosity),
+ 	OPT_END()
+ };
+ 
+ /* Cleans up metadata that is uninteresting after a succeeded merge. */
+ static void drop_save(void)
+ {
+ 	unlink(git_path("MERGE_HEAD"));
+ 	unlink(git_path("MERGE_MSG"));
+ 	unlink(git_path("MERGE_MODE"));
+ }
+ 
+ static void save_state(void)
+ {
+ 	int len;
+ 	struct child_process cp;
+ 	struct strbuf buffer = STRBUF_INIT;
+ 	const char *argv[] = {"stash", "create", NULL};
+ 
+ 	memset(&cp, 0, sizeof(cp));
+ 	cp.argv = argv;
+ 	cp.out = -1;
+ 	cp.git_cmd = 1;
+ 
+ 	if (start_command(&cp))
+ 		die("could not run stash.");
+ 	len = strbuf_read(&buffer, cp.out, 1024);
+ 	close(cp.out);
+ 
+ 	if (finish_command(&cp) || len < 0)
+ 		die("stash failed");
+ 	else if (!len)
+ 		return;
+ 	strbuf_setlen(&buffer, buffer.len-1);
+ 	if (get_sha1(buffer.buf, stash))
+ 		die("not a valid object: %s", buffer.buf);
+ }
+ 
+ static void reset_hard(unsigned const char *sha1, int verbose)
+ {
+ 	int i = 0;
+ 	const char *args[6];
+ 
+ 	args[i++] = "read-tree";
+ 	if (verbose)
+ 		args[i++] = "-v";
+ 	args[i++] = "--reset";
+ 	args[i++] = "-u";
+ 	args[i++] = sha1_to_hex(sha1);
+ 	args[i] = NULL;
+ 
+ 	if (run_command_v_opt(args, RUN_GIT_CMD))
+ 		die("read-tree failed");
+ }
+ 
+ static void restore_state(void)
+ {
+ 	struct strbuf sb = STRBUF_INIT;
+ 	const char *args[] = { "stash", "apply", NULL, NULL };
+ 
+ 	if (is_null_sha1(stash))
+ 		return;
+ 
+ 	reset_hard(head, 1);
+ 
+ 	args[2] = sha1_to_hex(stash);
+ 
+ 	/*
+ 	 * It is OK to ignore error here, for example when there was
+ 	 * nothing to restore.
+ 	 */
+ 	run_command_v_opt(args, RUN_GIT_CMD);
+ 
+ 	strbuf_release(&sb);
+ 	refresh_cache(REFRESH_QUIET);
+ }
+ 
+ /* This is called when no merge was necessary. */
+ static void finish_up_to_date(const char *msg)
+ {
+ 	if (verbosity >= 0)
+ 		printf("%s%s\n", squash ? " (nothing to squash)" : "", msg);
+ 	drop_save();
+ }
+ 
+ static void squash_message(void)
+ {
+ 	struct rev_info rev;
+ 	struct commit *commit;
+ 	struct strbuf out = STRBUF_INIT;
+ 	struct commit_list *j;
+ 	int fd;
+ 	struct pretty_print_context ctx = {0};
+ 
+ 	printf("Squash commit -- not updating HEAD\n");
+ 	fd = open(git_path("SQUASH_MSG"), O_WRONLY | O_CREAT, 0666);
+ 	if (fd < 0)
+ 		die_errno("Could not write to '%s'", git_path("SQUASH_MSG"));
+ 
+ 	init_revisions(&rev, NULL);
+ 	rev.ignore_merges = 1;
+ 	rev.commit_format = CMIT_FMT_MEDIUM;
+ 
+ 	commit = lookup_commit(head);
+ 	commit->object.flags |= UNINTERESTING;
+ 	add_pending_object(&rev, &commit->object, NULL);
+ 
+ 	for (j = remoteheads; j; j = j->next)
+ 		add_pending_object(&rev, &j->item->object, NULL);
+ 
+ 	setup_revisions(0, NULL, &rev, NULL);
+ 	if (prepare_revision_walk(&rev))
+ 		die("revision walk setup failed");
+ 
+ 	ctx.abbrev = rev.abbrev;
+ 	ctx.date_mode = rev.date_mode;
+ 
+ 	strbuf_addstr(&out, "Squashed commit of the following:\n");
+ 	while ((commit = get_revision(&rev)) != NULL) {
+ 		strbuf_addch(&out, '\n');
+ 		strbuf_addf(&out, "commit %s\n",
+ 			sha1_to_hex(commit->object.sha1));
+ 		pretty_print_commit(rev.commit_format, commit, &out, &ctx);
+ 	}
+ 	if (write(fd, out.buf, out.len) < 0)
+ 		die_errno("Writing SQUASH_MSG");
+ 	if (close(fd))
+ 		die_errno("Finishing SQUASH_MSG");
+ 	strbuf_release(&out);
+ }
+ 
+ static void finish(const unsigned char *new_head, const char *msg)
+ {
+ 	struct strbuf reflog_message = STRBUF_INIT;
+ 
+ 	if (!msg)
+ 		strbuf_addstr(&reflog_message, getenv("GIT_REFLOG_ACTION"));
+ 	else {
+ 		if (verbosity >= 0)
+ 			printf("%s\n", msg);
+ 		strbuf_addf(&reflog_message, "%s: %s",
+ 			getenv("GIT_REFLOG_ACTION"), msg);
+ 	}
+ 	if (squash) {
+ 		squash_message();
+ 	} else {
+ 		if (verbosity >= 0 && !merge_msg.len)
+ 			printf("No merge message -- not updating HEAD\n");
+ 		else {
+ 			const char *argv_gc_auto[] = { "gc", "--auto", NULL };
+ 			update_ref(reflog_message.buf, "HEAD",
+ 				new_head, head, 0,
+ 				DIE_ON_ERR);
+ 			/*
+ 			 * We ignore errors in 'gc --auto', since the
+ 			 * user should see them.
+ 			 */
+ 			run_command_v_opt(argv_gc_auto, RUN_GIT_CMD);
+ 		}
+ 	}
+ 	if (new_head && show_diffstat) {
+ 		struct diff_options opts;
+ 		diff_setup(&opts);
+ 		opts.output_format |=
+ 			DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
+ 		opts.detect_rename = DIFF_DETECT_RENAME;
+ 		if (diff_use_color_default > 0)
+ 			DIFF_OPT_SET(&opts, COLOR_DIFF);
+ 		if (diff_setup_done(&opts) < 0)
+ 			die("diff_setup_done failed");
+ 		diff_tree_sha1(head, new_head, "", &opts);
+ 		diffcore_std(&opts);
+ 		diff_flush(&opts);
+ 	}
+ 
+ 	/* Run a post-merge hook */
+ 	run_hook(NULL, "post-merge", squash ? "1" : "0", NULL);
+ 
+ 	strbuf_release(&reflog_message);
+ }
+ 
+ /* Get the name for the merge commit's message. */
+ static void merge_name(const char *remote, struct strbuf *msg)
+ {
+ 	struct object *remote_head;
+ 	unsigned char branch_head[20], buf_sha[20];
+ 	struct strbuf buf = STRBUF_INIT;
+ 	struct strbuf bname = STRBUF_INIT;
+ 	const char *ptr;
+ 	char *found_ref;
+ 	int len, early;
+ 
+ 	strbuf_branchname(&bname, remote);
+ 	remote = bname.buf;
+ 
+ 	memset(branch_head, 0, sizeof(branch_head));
+ 	remote_head = peel_to_type(remote, 0, NULL, OBJ_COMMIT);
+ 	if (!remote_head)
+ 		die("'%s' does not point to a commit", remote);
+ 
+ 	if (dwim_ref(remote, strlen(remote), branch_head, &found_ref) > 0) {
+ 		if (!prefixcmp(found_ref, "refs/heads/")) {
+ 			strbuf_addf(msg, "%s\t\tbranch '%s' of .\n",
+ 				    sha1_to_hex(branch_head), remote);
+ 			goto cleanup;
+ 		}
+ 		if (!prefixcmp(found_ref, "refs/remotes/")) {
+ 			strbuf_addf(msg, "%s\t\tremote branch '%s' of .\n",
+ 				    sha1_to_hex(branch_head), remote);
+ 			goto cleanup;
+ 		}
+ 	}
+ 
+ 	/* See if remote matches <name>^^^.. or <name>~<number> */
+ 	for (len = 0, ptr = remote + strlen(remote);
+ 	     remote < ptr && ptr[-1] == '^';
+ 	     ptr--)
+ 		len++;
+ 	if (len)
+ 		early = 1;
+ 	else {
+ 		early = 0;
+ 		ptr = strrchr(remote, '~');
+ 		if (ptr) {
+ 			int seen_nonzero = 0;
+ 
+ 			len++; /* count ~ */
+ 			while (*++ptr && isdigit(*ptr)) {
+ 				seen_nonzero |= (*ptr != '0');
+ 				len++;
+ 			}
+ 			if (*ptr)
+ 				len = 0; /* not ...~<number> */
+ 			else if (seen_nonzero)
+ 				early = 1;
+ 			else if (len == 1)
+ 				early = 1; /* "name~" is "name~1"! */
+ 		}
+ 	}
+ 	if (len) {
+ 		struct strbuf truname = STRBUF_INIT;
+ 		strbuf_addstr(&truname, "refs/heads/");
+ 		strbuf_addstr(&truname, remote);
+ 		strbuf_setlen(&truname, truname.len - len);
+ 		if (resolve_ref(truname.buf, buf_sha, 0, NULL)) {
+ 			strbuf_addf(msg,
+ 				    "%s\t\tbranch '%s'%s of .\n",
+ 				    sha1_to_hex(remote_head->sha1),
+ 				    truname.buf + 11,
+ 				    (early ? " (early part)" : ""));
+ 			strbuf_release(&truname);
+ 			goto cleanup;
+ 		}
+ 	}
+ 
+ 	if (!strcmp(remote, "FETCH_HEAD") &&
+ 			!access(git_path("FETCH_HEAD"), R_OK)) {
+ 		FILE *fp;
+ 		struct strbuf line = STRBUF_INIT;
+ 		char *ptr;
+ 
+ 		fp = fopen(git_path("FETCH_HEAD"), "r");
+ 		if (!fp)
+ 			die_errno("could not open '%s' for reading",
+ 				  git_path("FETCH_HEAD"));
+ 		strbuf_getline(&line, fp, '\n');
+ 		fclose(fp);
+ 		ptr = strstr(line.buf, "\tnot-for-merge\t");
+ 		if (ptr)
+ 			strbuf_remove(&line, ptr-line.buf+1, 13);
+ 		strbuf_addbuf(msg, &line);
+ 		strbuf_release(&line);
+ 		goto cleanup;
+ 	}
+ 	strbuf_addf(msg, "%s\t\tcommit '%s'\n",
+ 		sha1_to_hex(remote_head->sha1), remote);
+ cleanup:
+ 	strbuf_release(&buf);
+ 	strbuf_release(&bname);
+ }
+ 
+ static int git_merge_config(const char *k, const char *v, void *cb)
+ {
+ 	if (branch && !prefixcmp(k, "branch.") &&
+ 		!prefixcmp(k + 7, branch) &&
+ 		!strcmp(k + 7 + strlen(branch), ".mergeoptions")) {
+ 		const char **argv;
+ 		int argc;
+ 		char *buf;
+ 
+ 		buf = xstrdup(v);
+ 		argc = split_cmdline(buf, &argv);
+ 		if (argc < 0)
+ 			die("Bad branch.%s.mergeoptions string", branch);
+ 		argv = xrealloc(argv, sizeof(*argv) * (argc + 2));
+ 		memmove(argv + 1, argv, sizeof(*argv) * (argc + 1));
+ 		argc++;
+ 		parse_options(argc, argv, NULL, builtin_merge_options,
+ 			      builtin_merge_usage, 0);
+ 		free(buf);
+ 	}
+ 
+ 	if (!strcmp(k, "merge.diffstat") || !strcmp(k, "merge.stat"))
+ 		show_diffstat = git_config_bool(k, v);
+ 	else if (!strcmp(k, "pull.twohead"))
+ 		return git_config_string(&pull_twohead, k, v);
+ 	else if (!strcmp(k, "pull.octopus"))
+ 		return git_config_string(&pull_octopus, k, v);
+ 	else if (!strcmp(k, "merge.log") || !strcmp(k, "merge.summary"))
+ 		option_log = git_config_bool(k, v);
+ 	return git_diff_ui_config(k, v, cb);
+ }
+ 
+ static int read_tree_trivial(unsigned char *common, unsigned char *head,
+ 			     unsigned char *one)
+ {
+ 	int i, nr_trees = 0;
+ 	struct tree *trees[MAX_UNPACK_TREES];
+ 	struct tree_desc t[MAX_UNPACK_TREES];
+ 	struct unpack_trees_options opts;
+ 
+ 	memset(&opts, 0, sizeof(opts));
+ 	opts.head_idx = 2;
+ 	opts.src_index = &the_index;
+ 	opts.dst_index = &the_index;
+ 	opts.update = 1;
+ 	opts.verbose_update = 1;
+ 	opts.trivial_merges_only = 1;
+ 	opts.merge = 1;
+ 	trees[nr_trees] = parse_tree_indirect(common);
+ 	if (!trees[nr_trees++])
+ 		return -1;
+ 	trees[nr_trees] = parse_tree_indirect(head);
+ 	if (!trees[nr_trees++])
+ 		return -1;
+ 	trees[nr_trees] = parse_tree_indirect(one);
+ 	if (!trees[nr_trees++])
+ 		return -1;
+ 	opts.fn = threeway_merge;
+ 	cache_tree_free(&active_cache_tree);
+ 	for (i = 0; i < nr_trees; i++) {
+ 		parse_tree(trees[i]);
+ 		init_tree_desc(t+i, trees[i]->buffer, trees[i]->size);
+ 	}
+ 	if (unpack_trees(nr_trees, t, &opts))
+ 		return -1;
+ 	return 0;
+ }
+ 
+ static void write_tree_trivial(unsigned char *sha1)
+ {
+ 	if (write_cache_as_tree(sha1, 0, NULL))
+ 		die("git write-tree failed to write a tree");
+ }
+ 
+ static int try_merge_strategy(const char *strategy, struct commit_list *common,
+ 			      const char *head_arg)
+ {
+ 	const char **args;
+ 	int i = 0, x = 0, ret;
+ 	struct commit_list *j;
+ 	struct strbuf buf = STRBUF_INIT;
+ 	int index_fd;
+ 	struct lock_file *lock = xcalloc(1, sizeof(struct lock_file));
+ 
+ 	index_fd = hold_locked_index(lock, 1);
+ 	refresh_cache(REFRESH_QUIET);
+ 	if (active_cache_changed &&
+ 			(write_cache(index_fd, active_cache, active_nr) ||
+ 			 commit_locked_index(lock)))
+ 		return error("Unable to write index.");
+ 	rollback_lock_file(lock);
+ 
+ 	if (!strcmp(strategy, "recursive") || !strcmp(strategy, "subtree")) {
+ 		int clean;
+ 		struct commit *result;
+ 		struct lock_file *lock = xcalloc(1, sizeof(struct lock_file));
+ 		int index_fd;
+ 		struct commit_list *reversed = NULL;
+ 		struct merge_options o;
+ 
+ 		if (remoteheads->next) {
+ 			error("Not handling anything other than two heads merge.");
+ 			return 2;
+ 		}
+ 
+ 		init_merge_options(&o);
+ 		if (!strcmp(strategy, "subtree"))
+ 			o.subtree_shift = "";
+ 
+ 		for (x = 0; x < xopts_nr; x++) {
+ 			if (!strcmp(xopts[x], "ours"))
+ 				o.recursive_variant = MERGE_RECURSIVE_OURS;
+ 			else if (!strcmp(xopts[x], "theirs"))
+ 				o.recursive_variant = MERGE_RECURSIVE_THEIRS;
+ 			else if (!strcmp(xopts[x], "subtree"))
+ 				o.subtree_shift = "";
+ 			else if (!prefixcmp(xopts[x], "subtree="))
+ 				o.subtree_shift = xopts[x]+8;
+ 			else
+ 				die("Unknown option for merge-recursive: -X%s", xopts[x]);
+ 		}
+ 
+ 		o.branch1 = head_arg;
+ 		o.branch2 = remoteheads->item->util;
+ 
+ 		for (j = common; j; j = j->next)
+ 			commit_list_insert(j->item, &reversed);
+ 
+ 		index_fd = hold_locked_index(lock, 1);
+ 		clean = merge_recursive(&o, lookup_commit(head),
+ 				remoteheads->item, reversed, &result);
+ 		if (active_cache_changed &&
+ 				(write_cache(index_fd, active_cache, active_nr) ||
+ 				 commit_locked_index(lock)))
+ 			die ("unable to write %s", get_index_file());
+ 		rollback_lock_file(lock);
+ 		return clean ? 0 : 1;
+ 	} else {
+ 		args = xmalloc((4 + xopts_nr + commit_list_count(common) +
+ 					commit_list_count(remoteheads)) * sizeof(char *));
+ 		strbuf_addf(&buf, "merge-%s", strategy);
+ 		args[i++] = buf.buf;
+ 		for (x = 0; x < xopts_nr; x++) {
+ 			char *s = xmalloc(strlen(xopts[x])+2+1);
+ 			strcpy(s, "--");
+ 			strcpy(s+2, xopts[x]);
+ 			args[i++] = s;
+ 		}
+ 		for (j = common; j; j = j->next)
+ 			args[i++] = xstrdup(sha1_to_hex(j->item->object.sha1));
+ 		args[i++] = "--";
+ 		args[i++] = head_arg;
+ 		for (j = remoteheads; j; j = j->next)
+ 			args[i++] = xstrdup(sha1_to_hex(j->item->object.sha1));
+ 		args[i] = NULL;
+ 		ret = run_command_v_opt(args, RUN_GIT_CMD);
+ 		strbuf_release(&buf);
+ 		i = 1;
+ 		for (x = 0; x < xopts_nr; x++)
+ 			free((void *)args[i++]);
+ 		for (j = common; j; j = j->next)
+ 			free((void *)args[i++]);
+ 		i += 2;
+ 		for (j = remoteheads; j; j = j->next)
+ 			free((void *)args[i++]);
+ 		free(args);
+ 		discard_cache();
+ 		if (read_cache() < 0)
+ 			die("failed to read the cache");
+ 		resolve_undo_clear();
+ 		return ret;
+ 	}
+ }
+ 
+ static void count_diff_files(struct diff_queue_struct *q,
+ 			     struct diff_options *opt, void *data)
+ {
+ 	int *count = data;
+ 
+ 	(*count) += q->nr;
+ }
+ 
+ static int count_unmerged_entries(void)
+ {
+ 	int i, ret = 0;
+ 
+ 	for (i = 0; i < active_nr; i++)
+ 		if (ce_stage(active_cache[i]))
+ 			ret++;
+ 
+ 	return ret;
+ }
+ 
+ static int checkout_fast_forward(unsigned char *head, unsigned char *remote)
+ {
+ 	struct tree *trees[MAX_UNPACK_TREES];
+ 	struct unpack_trees_options opts;
+ 	struct tree_desc t[MAX_UNPACK_TREES];
+ 	int i, fd, nr_trees = 0;
+ 	struct dir_struct dir;
+ 	struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
+ 
+ 	refresh_cache(REFRESH_QUIET);
+ 
+ 	fd = hold_locked_index(lock_file, 1);
+ 
+ 	memset(&trees, 0, sizeof(trees));
+ 	memset(&opts, 0, sizeof(opts));
+ 	memset(&t, 0, sizeof(t));
+ 	memset(&dir, 0, sizeof(dir));
+ 	dir.flags |= DIR_SHOW_IGNORED;
+ 	dir.exclude_per_dir = ".gitignore";
+ 	opts.dir = &dir;
+ 
+ 	opts.head_idx = 1;
+ 	opts.src_index = &the_index;
+ 	opts.dst_index = &the_index;
+ 	opts.update = 1;
+ 	opts.verbose_update = 1;
+ 	opts.merge = 1;
+ 	opts.fn = twoway_merge;
+ 	opts.msgs = get_porcelain_error_msgs();
+ 
+ 	trees[nr_trees] = parse_tree_indirect(head);
+ 	if (!trees[nr_trees++])
+ 		return -1;
+ 	trees[nr_trees] = parse_tree_indirect(remote);
+ 	if (!trees[nr_trees++])
+ 		return -1;
+ 	for (i = 0; i < nr_trees; i++) {
+ 		parse_tree(trees[i]);
+ 		init_tree_desc(t+i, trees[i]->buffer, trees[i]->size);
+ 	}
+ 	if (unpack_trees(nr_trees, t, &opts))
+ 		return -1;
+ 	if (write_cache(fd, active_cache, active_nr) ||
+ 		commit_locked_index(lock_file))
+ 		die("unable to write new index file");
+ 	return 0;
+ }
+ 
+ static void split_merge_strategies(const char *string, struct strategy **list,
+ 				   int *nr, int *alloc)
+ {
+ 	char *p, *q, *buf;
+ 
+ 	if (!string)
+ 		return;
+ 
+ 	buf = xstrdup(string);
+ 	q = buf;
+ 	for (;;) {
+ 		p = strchr(q, ' ');
+ 		if (!p) {
+ 			ALLOC_GROW(*list, *nr + 1, *alloc);
+ 			(*list)[(*nr)++].name = xstrdup(q);
+ 			free(buf);
+ 			return;
+ 		} else {
+ 			*p = '\0';
+ 			ALLOC_GROW(*list, *nr + 1, *alloc);
+ 			(*list)[(*nr)++].name = xstrdup(q);
+ 			q = ++p;
+ 		}
+ 	}
+ }
+ 
+ static void add_strategies(const char *string, unsigned attr)
+ {
+ 	struct strategy *list = NULL;
+ 	int list_alloc = 0, list_nr = 0, i;
+ 
+ 	memset(&list, 0, sizeof(list));
+ 	split_merge_strategies(string, &list, &list_nr, &list_alloc);
+ 	if (list) {
+ 		for (i = 0; i < list_nr; i++)
+ 			append_strategy(get_strategy(list[i].name));
+ 		return;
+ 	}
+ 	for (i = 0; i < ARRAY_SIZE(all_strategy); i++)
+ 		if (all_strategy[i].attr & attr)
+ 			append_strategy(&all_strategy[i]);
+ 
+ }
+ 
+ static int merge_trivial(void)
+ {
+ 	unsigned char result_tree[20], result_commit[20];
+ 	struct commit_list *parent = xmalloc(sizeof(*parent));
+ 
+ 	write_tree_trivial(result_tree);
+ 	printf("Wonderful.\n");
+ 	parent->item = lookup_commit(head);
+ 	parent->next = xmalloc(sizeof(*parent->next));
+ 	parent->next->item = remoteheads->item;
+ 	parent->next->next = NULL;
+ 	commit_tree(merge_msg.buf, result_tree, parent, result_commit, NULL);
+ 	finish(result_commit, "In-index merge");
+ 	drop_save();
+ 	return 0;
+ }
+ 
+ static int finish_automerge(struct commit_list *common,
+ 			    unsigned char *result_tree,
+ 			    const char *wt_strategy)
+ {
+ 	struct commit_list *parents = NULL, *j;
+ 	struct strbuf buf = STRBUF_INIT;
+ 	unsigned char result_commit[20];
+ 
+ 	free_commit_list(common);
+ 	if (allow_fast_forward) {
+ 		parents = remoteheads;
+ 		commit_list_insert(lookup_commit(head), &parents);
+ 		parents = reduce_heads(parents);
+ 	} else {
+ 		struct commit_list **pptr = &parents;
+ 
+ 		pptr = &commit_list_insert(lookup_commit(head),
+ 				pptr)->next;
+ 		for (j = remoteheads; j; j = j->next)
+ 			pptr = &commit_list_insert(j->item, pptr)->next;
+ 	}
+ 	free_commit_list(remoteheads);
+ 	strbuf_addch(&merge_msg, '\n');
+ 	commit_tree(merge_msg.buf, result_tree, parents, result_commit, NULL);
+ 	strbuf_addf(&buf, "Merge made by %s.", wt_strategy);
+ 	finish(result_commit, buf.buf);
+ 	strbuf_release(&buf);
+ 	drop_save();
+ 	return 0;
+ }
+ 
+ static int suggest_conflicts(void)
+ {
+ 	FILE *fp;
+ 	int pos;
+ 
+ 	fp = fopen(git_path("MERGE_MSG"), "a");
+ 	if (!fp)
+ 		die_errno("Could not open '%s' for writing",
+ 			  git_path("MERGE_MSG"));
+ 	fprintf(fp, "\nConflicts:\n");
+ 	for (pos = 0; pos < active_nr; pos++) {
+ 		struct cache_entry *ce = active_cache[pos];
+ 
+ 		if (ce_stage(ce)) {
+ 			fprintf(fp, "\t%s\n", ce->name);
+ 			while (pos + 1 < active_nr &&
+ 					!strcmp(ce->name,
+ 						active_cache[pos + 1]->name))
+ 				pos++;
+ 		}
+ 	}
+ 	fclose(fp);
+ 	rerere(allow_rerere_auto);
+ 	printf("Automatic merge failed; "
+ 			"fix conflicts and then commit the result.\n");
+ 	return 1;
+ }
+ 
+ static struct commit *is_old_style_invocation(int argc, const char **argv)
+ {
+ 	struct commit *second_token = NULL;
+ 	if (argc > 2) {
+ 		unsigned char second_sha1[20];
+ 
+ 		if (get_sha1(argv[1], second_sha1))
+ 			return NULL;
+ 		second_token = lookup_commit_reference_gently(second_sha1, 0);
+ 		if (!second_token)
+ 			die("'%s' is not a commit", argv[1]);
+ 		if (hashcmp(second_token->object.sha1, head))
+ 			return NULL;
+ 	}
+ 	return second_token;
+ }
+ 
+ static int evaluate_result(void)
+ {
+ 	int cnt = 0;
+ 	struct rev_info rev;
+ 
+ 	/* Check how many files differ. */
+ 	init_revisions(&rev, "");
+ 	setup_revisions(0, NULL, &rev, NULL);
+ 	rev.diffopt.output_format |=
+ 		DIFF_FORMAT_CALLBACK;
+ 	rev.diffopt.format_callback = count_diff_files;
+ 	rev.diffopt.format_callback_data = &cnt;
+ 	run_diff_files(&rev, 0);
+ 
+ 	/*
+ 	 * Check how many unmerged entries are
+ 	 * there.
+ 	 */
+ 	cnt += count_unmerged_entries();
+ 
+ 	return cnt;
+ }
+ 
+ int cmd_merge(int argc, const char **argv, const char *prefix)
+ {
+ 	unsigned char result_tree[20];
+ 	struct strbuf buf = STRBUF_INIT;
+ 	const char *head_arg;
+ 	int flag, head_invalid = 0, i;
+ 	int best_cnt = -1, merge_was_ok = 0, automerge_was_ok = 0;
+ 	struct commit_list *common = NULL;
+ 	const char *best_strategy = NULL, *wt_strategy = NULL;
+ 	struct commit_list **remotes = &remoteheads;
+ 
+ 	if (read_cache_unmerged()) {
+ 		die_resolve_conflict("merge");
+ 	}
+ 	if (file_exists(git_path("MERGE_HEAD"))) {
+ 		/*
+ 		 * There is no unmerged entry, don't advise 'git
+ 		 * add/rm <file>', just 'git commit'.
+ 		 */
+ 		if (advice_resolve_conflict)
+ 			die("You have not concluded your merge (MERGE_HEAD exists).\n"
+ 			    "Please, commit your changes before you can merge.");
+ 		else
+ 			die("You have not concluded your merge (MERGE_HEAD exists).");
+ 	}
+ 
+ 	resolve_undo_clear();
+ 	/*
+ 	 * Check if we are _not_ on a detached HEAD, i.e. if there is a
+ 	 * current branch.
+ 	 */
+ 	branch = resolve_ref("HEAD", head, 0, &flag);
+ 	if (branch && !prefixcmp(branch, "refs/heads/"))
+ 		branch += 11;
+ 	if (is_null_sha1(head))
+ 		head_invalid = 1;
+ 
+ 	git_config(git_merge_config, NULL);
+ 
+ 	/* for color.ui */
+ 	if (diff_use_color_default == -1)
+ 		diff_use_color_default = git_use_color_default;
+ 
+ 	argc = parse_options(argc, argv, prefix, builtin_merge_options,
+ 			builtin_merge_usage, 0);
+ 	if (verbosity < 0)
+ 		show_diffstat = 0;
+ 
+ 	if (squash) {
+ 		if (!allow_fast_forward)
+ 			die("You cannot combine --squash with --no-ff.");
+ 		option_commit = 0;
+ 	}
+ 
+ 	if (!allow_fast_forward && fast_forward_only)
+ 		die("You cannot combine --no-ff with --ff-only.");
+ 
+ 	if (!argc)
+ 		usage_with_options(builtin_merge_usage,
+ 			builtin_merge_options);
+ 
+ 	/*
+ 	 * This could be traditional "merge <msg> HEAD <commit>..."  and
+ 	 * the way we can tell it is to see if the second token is HEAD,
+ 	 * but some people might have misused the interface and used a
+ 	 * committish that is the same as HEAD there instead.
+ 	 * Traditional format never would have "-m" so it is an
+ 	 * additional safety measure to check for it.
+ 	 */
+ 
+ 	if (!have_message && is_old_style_invocation(argc, argv)) {
+ 		strbuf_addstr(&merge_msg, argv[0]);
+ 		head_arg = argv[1];
+ 		argv += 2;
+ 		argc -= 2;
+ 	} else if (head_invalid) {
+ 		struct object *remote_head;
+ 		/*
+ 		 * If the merged head is a valid one there is no reason
+ 		 * to forbid "git merge" into a branch yet to be born.
+ 		 * We do the same for "git pull".
+ 		 */
+ 		if (argc != 1)
+ 			die("Can merge only exactly one commit into "
+ 				"empty head");
+ 		if (squash)
+ 			die("Squash commit into empty head not supported yet");
+ 		if (!allow_fast_forward)
+ 			die("Non-fast-forward commit does not make sense into "
+ 			    "an empty head");
+ 		remote_head = peel_to_type(argv[0], 0, NULL, OBJ_COMMIT);
+ 		if (!remote_head)
+ 			die("%s - not something we can merge", argv[0]);
+ 		update_ref("initial pull", "HEAD", remote_head->sha1, NULL, 0,
+ 				DIE_ON_ERR);
+ 		reset_hard(remote_head->sha1, 0);
+ 		return 0;
+ 	} else {
+ 		struct strbuf msg = STRBUF_INIT;
+ 
+ 		/* We are invoked directly as the first-class UI. */
+ 		head_arg = "HEAD";
+ 
+ 		/*
+ 		 * All the rest are the commits being merged;
+ 		 * prepare the standard merge summary message to
+ 		 * be appended to the given message.  If remote
+ 		 * is invalid we will die later in the common
+ 		 * codepath so we discard the error in this
+ 		 * loop.
+ 		 */
+ 		if (!have_message) {
+ 			for (i = 0; i < argc; i++)
+ 				merge_name(argv[i], &msg);
+ 			fmt_merge_msg(option_log, &msg, &merge_msg);
+ 			if (merge_msg.len)
+ 				strbuf_setlen(&merge_msg, merge_msg.len-1);
+ 		}
+ 	}
+ 
+ 	if (head_invalid || !argc)
+ 		usage_with_options(builtin_merge_usage,
+ 			builtin_merge_options);
+ 
+ 	strbuf_addstr(&buf, "merge");
+ 	for (i = 0; i < argc; i++)
+ 		strbuf_addf(&buf, " %s", argv[i]);
+ 	setenv("GIT_REFLOG_ACTION", buf.buf, 0);
+ 	strbuf_reset(&buf);
+ 
+ 	for (i = 0; i < argc; i++) {
+ 		struct object *o;
+ 		struct commit *commit;
+ 
+ 		o = peel_to_type(argv[i], 0, NULL, OBJ_COMMIT);
+ 		if (!o)
+ 			die("%s - not something we can merge", argv[i]);
+ 		commit = lookup_commit(o->sha1);
+ 		commit->util = (void *)argv[i];
+ 		remotes = &commit_list_insert(commit, remotes)->next;
+ 
+ 		strbuf_addf(&buf, "GITHEAD_%s", sha1_to_hex(o->sha1));
+ 		setenv(buf.buf, argv[i], 1);
+ 		strbuf_reset(&buf);
+ 	}
+ 
+ 	if (!use_strategies) {
+ 		if (!remoteheads->next)
+ 			add_strategies(pull_twohead, DEFAULT_TWOHEAD);
+ 		else
+ 			add_strategies(pull_octopus, DEFAULT_OCTOPUS);
+ 	}
+ 
+ 	for (i = 0; i < use_strategies_nr; i++) {
+ 		if (use_strategies[i]->attr & NO_FAST_FORWARD)
+ 			allow_fast_forward = 0;
+ 		if (use_strategies[i]->attr & NO_TRIVIAL)
+ 			allow_trivial = 0;
+ 	}
+ 
+ 	if (!remoteheads->next)
+ 		common = get_merge_bases(lookup_commit(head),
+ 				remoteheads->item, 1);
+ 	else {
+ 		struct commit_list *list = remoteheads;
+ 		commit_list_insert(lookup_commit(head), &list);
+ 		common = get_octopus_merge_bases(list);
+ 		free(list);
+ 	}
+ 
+ 	update_ref("updating ORIG_HEAD", "ORIG_HEAD", head, NULL, 0,
+ 		DIE_ON_ERR);
+ 
+ 	if (!common)
+ 		; /* No common ancestors found. We need a real merge. */
+ 	else if (!remoteheads->next && !common->next &&
+ 			common->item == remoteheads->item) {
+ 		/*
+ 		 * If head can reach all the merge then we are up to date.
+ 		 * but first the most common case of merging one remote.
+ 		 */
+ 		finish_up_to_date("Already up-to-date.");
+ 		return 0;
+ 	} else if (allow_fast_forward && !remoteheads->next &&
+ 			!common->next &&
+ 			!hashcmp(common->item->object.sha1, head)) {
+ 		/* Again the most common case of merging one remote. */
+ 		struct strbuf msg = STRBUF_INIT;
+ 		struct object *o;
+ 		char hex[41];
+ 
+ 		strcpy(hex, find_unique_abbrev(head, DEFAULT_ABBREV));
+ 
+ 		if (verbosity >= 0)
+ 			printf("Updating %s..%s\n",
+ 				hex,
+ 				find_unique_abbrev(remoteheads->item->object.sha1,
+ 				DEFAULT_ABBREV));
+ 		strbuf_addstr(&msg, "Fast-forward");
+ 		if (have_message)
+ 			strbuf_addstr(&msg,
+ 				" (no commit created; -m option ignored)");
+ 		o = peel_to_type(sha1_to_hex(remoteheads->item->object.sha1),
+ 			0, NULL, OBJ_COMMIT);
+ 		if (!o)
+ 			return 1;
+ 
+ 		if (checkout_fast_forward(head, remoteheads->item->object.sha1))
+ 			return 1;
+ 
+ 		finish(o->sha1, msg.buf);
+ 		drop_save();
+ 		return 0;
+ 	} else if (!remoteheads->next && common->next)
+ 		;
+ 		/*
+ 		 * We are not doing octopus and not fast-forward.  Need
+ 		 * a real merge.
+ 		 */
+ 	else if (!remoteheads->next && !common->next && option_commit) {
+ 		/*
+ 		 * We are not doing octopus, not fast-forward, and have
+ 		 * only one common.
+ 		 */
+ 		refresh_cache(REFRESH_QUIET);
+ 		if (allow_trivial && !fast_forward_only) {
+ 			/* See if it is really trivial. */
+ 			git_committer_info(IDENT_ERROR_ON_NO_NAME);
+ 			printf("Trying really trivial in-index merge...\n");
+ 			if (!read_tree_trivial(common->item->object.sha1,
+ 					head, remoteheads->item->object.sha1))
+ 				return merge_trivial();
+ 			printf("Nope.\n");
+ 		}
+ 	} else {
+ 		/*
+ 		 * An octopus.  If we can reach all the remote we are up
+ 		 * to date.
+ 		 */
+ 		int up_to_date = 1;
+ 		struct commit_list *j;
+ 
+ 		for (j = remoteheads; j; j = j->next) {
+ 			struct commit_list *common_one;
+ 
+ 			/*
+ 			 * Here we *have* to calculate the individual
+ 			 * merge_bases again, otherwise "git merge HEAD^
+ 			 * HEAD^^" would be missed.
+ 			 */
+ 			common_one = get_merge_bases(lookup_commit(head),
+ 				j->item, 1);
+ 			if (hashcmp(common_one->item->object.sha1,
+ 				j->item->object.sha1)) {
+ 				up_to_date = 0;
+ 				break;
+ 			}
+ 		}
+ 		if (up_to_date) {
+ 			finish_up_to_date("Already up-to-date. Yeeah!");
+ 			return 0;
+ 		}
+ 	}
+ 
+ 	if (fast_forward_only)
+ 		die("Not possible to fast-forward, aborting.");
+ 
+ 	/* We are going to make a new commit. */
+ 	git_committer_info(IDENT_ERROR_ON_NO_NAME);
+ 
+ 	/*
+ 	 * At this point, we need a real merge.  No matter what strategy
+ 	 * we use, it would operate on the index, possibly affecting the
+ 	 * working tree, and when resolved cleanly, have the desired
+ 	 * tree in the index -- this means that the index must be in
+ 	 * sync with the head commit.  The strategies are responsible
+ 	 * to ensure this.
+ 	 */
+ 	if (use_strategies_nr != 1) {
+ 		/*
+ 		 * Stash away the local changes so that we can try more
+ 		 * than one.
+ 		 */
+ 		save_state();
+ 	} else {
+ 		memcpy(stash, null_sha1, 20);
+ 	}
+ 
+ 	for (i = 0; i < use_strategies_nr; i++) {
+ 		int ret;
+ 		if (i) {
+ 			printf("Rewinding the tree to pristine...\n");
+ 			restore_state();
+ 		}
+ 		if (use_strategies_nr != 1)
+ 			printf("Trying merge strategy %s...\n",
+ 				use_strategies[i]->name);
+ 		/*
+ 		 * Remember which strategy left the state in the working
+ 		 * tree.
+ 		 */
+ 		wt_strategy = use_strategies[i]->name;
+ 
+ 		ret = try_merge_strategy(use_strategies[i]->name,
+ 			common, head_arg);
+ 		if (!option_commit && !ret) {
+ 			merge_was_ok = 1;
+ 			/*
+ 			 * This is necessary here just to avoid writing
+ 			 * the tree, but later we will *not* exit with
+ 			 * status code 1 because merge_was_ok is set.
+ 			 */
+ 			ret = 1;
+ 		}
+ 
+ 		if (ret) {
+ 			/*
+ 			 * The backend exits with 1 when conflicts are
+ 			 * left to be resolved, with 2 when it does not
+ 			 * handle the given merge at all.
+ 			 */
+ 			if (ret == 1) {
+ 				int cnt = evaluate_result();
+ 
+ 				if (best_cnt <= 0 || cnt <= best_cnt) {
+ 					best_strategy = use_strategies[i]->name;
+ 					best_cnt = cnt;
+ 				}
+ 			}
+ 			if (merge_was_ok)
+ 				break;
+ 			else
+ 				continue;
+ 		}
+ 
+ 		/* Automerge succeeded. */
+ 		write_tree_trivial(result_tree);
+ 		automerge_was_ok = 1;
+ 		break;
+ 	}
+ 
+ 	/*
+ 	 * If we have a resulting tree, that means the strategy module
+ 	 * auto resolved the merge cleanly.
+ 	 */
+ 	if (automerge_was_ok)
+ 		return finish_automerge(common, result_tree, wt_strategy);
+ 
+ 	/*
+ 	 * Pick the result from the best strategy and have the user fix
+ 	 * it up.
+ 	 */
+ 	if (!best_strategy) {
+ 		restore_state();
+ 		if (use_strategies_nr > 1)
+ 			fprintf(stderr,
+ 				"No merge strategy handled the merge.\n");
+ 		else
+ 			fprintf(stderr, "Merge with strategy %s failed.\n",
+ 				use_strategies[0]->name);
+ 		return 2;
+ 	} else if (best_strategy == wt_strategy)
+ 		; /* We already have its result in the working tree. */
+ 	else {
+ 		printf("Rewinding the tree to pristine...\n");
+ 		restore_state();
+ 		printf("Using the %s to prepare resolving by hand.\n",
+ 			best_strategy);
+ 		try_merge_strategy(best_strategy, common, head_arg);
+ 	}
+ 
+ 	if (squash)
+ 		finish(NULL, NULL);
+ 	else {
+ 		int fd;
+ 		struct commit_list *j;
+ 
+ 		for (j = remoteheads; j; j = j->next)
+ 			strbuf_addf(&buf, "%s\n",
+ 				sha1_to_hex(j->item->object.sha1));
+ 		fd = open(git_path("MERGE_HEAD"), O_WRONLY | O_CREAT, 0666);
+ 		if (fd < 0)
+ 			die_errno("Could not open '%s' for writing",
+ 				  git_path("MERGE_HEAD"));
+ 		if (write_in_full(fd, buf.buf, buf.len) != buf.len)
+ 			die_errno("Could not write to '%s'", git_path("MERGE_HEAD"));
+ 		close(fd);
+ 		strbuf_addch(&merge_msg, '\n');
+ 		fd = open(git_path("MERGE_MSG"), O_WRONLY | O_CREAT, 0666);
+ 		if (fd < 0)
+ 			die_errno("Could not open '%s' for writing",
+ 				  git_path("MERGE_MSG"));
+ 		if (write_in_full(fd, merge_msg.buf, merge_msg.len) !=
+ 			merge_msg.len)
+ 			die_errno("Could not write to '%s'", git_path("MERGE_MSG"));
+ 		close(fd);
+ 		fd = open(git_path("MERGE_MODE"), O_WRONLY | O_CREAT | O_TRUNC, 0666);
+ 		if (fd < 0)
+ 			die_errno("Could not open '%s' for writing",
+ 				  git_path("MERGE_MODE"));
+ 		strbuf_reset(&buf);
+ 		if (!allow_fast_forward)
+ 			strbuf_addf(&buf, "no-ff");
+ 		if (write_in_full(fd, buf.buf, buf.len) != buf.len)
+ 			die_errno("Could not write to '%s'", git_path("MERGE_MODE"));
+ 		close(fd);
+ 	}
+ 
+ 	if (merge_was_ok) {
+ 		fprintf(stderr, "Automatic merge went well; "
+ 			"stopped before committing as requested\n");
+ 		return 0;
+ 	} else
+ 		return suggest_conflicts();
+ }