builtin-commit.c

   1 /*
   2  * Builtin "git commit"
   3  *
   4  * Copyright (c) 2007 Kristian Høgsberg <krh@redhat.com>
   5  * Based on git-commit.sh by Junio C Hamano and Linus Torvalds
   6  */
   7
   8 #include "cache.h"
   9 #include "cache-tree.h"
  10 #include "color.h"
  11 #include "dir.h"
  12 #include "builtin.h"
  13 #include "diff.h"
  14 #include "diffcore.h"
  15 #include "commit.h"
  16 #include "revision.h"
  17 #include "wt-status.h"
  18 #include "run-command.h"
  19 #include "refs.h"
  20 #include "log-tree.h"
  21 #include "strbuf.h"
  22 #include "utf8.h"
  23 #include "parse-options.h"
  24 #include "path-list.h"
  25 #include "unpack-trees.h"
  26
  27 static const char * const builtin_commit_usage[] = {
  28         "git-commit [options] [--] <filepattern>...",
  29         NULL
  30 };
  31
  32 static const char * const builtin_status_usage[] = {
  33         "git-status [options] [--] <filepattern>...",
  34         NULL
  35 };
  36
  37 static unsigned char head_sha1[20], merge_head_sha1[20];
  38 static char *use_message_buffer;
  39 static const char commit_editmsg[] = "COMMIT_EDITMSG";
  40 static struct lock_file index_lock; /* real index */
  41 static struct lock_file false_lock; /* used only for partial commits */
  42 static enum {
  43         COMMIT_AS_IS = 1,
  44         COMMIT_NORMAL,
  45         COMMIT_PARTIAL,
  46 } commit_style;
  47
  48 static char *logfile, *force_author, *template_file;
  49 static char *edit_message, *use_message;
  50 static char *author_name, *author_email, *author_date;
  51 static int all, edit_flag, also, interactive, only, amend, signoff;
  52 static int quiet, verbose, untracked_files, no_verify, allow_empty;
  53 /*
  54  * The default commit message cleanup mode will remove the lines
  55  * beginning with # (shell comments) and leading and trailing
  56  * whitespaces (empty lines or containing only whitespaces)
  57  * if editor is used, and only the whitespaces if the message
  58  * is specified explicitly.
  59  */
  60 static enum {
  61         CLEANUP_SPACE,
  62         CLEANUP_NONE,
  63         CLEANUP_ALL,
  64 } cleanup_mode;
  65 static char *cleanup_arg;
  66
  67 static int use_editor = 1, initial_commit, in_merge;
  68 const char *only_include_assumed;
  69 struct strbuf message;
  70
  71 static int opt_parse_m(const struct option *opt, const char *arg, int unset)
  72 {
  73         struct strbuf *buf = opt->value;
  74         if (unset)
  75                 strbuf_setlen(buf, 0);
  76         else {
  77                 strbuf_addstr(buf, arg);
  78                 strbuf_addch(buf, '\n');
  79                 strbuf_addch(buf, '\n');
  80         }
  81         return 0;
  82 }
  83
  84 static struct option builtin_commit_options[] = {
  85         OPT__QUIET(&quiet),
  86         OPT__VERBOSE(&verbose),
  87         OPT_GROUP("Commit message options"),
  88
  89         OPT_STRING('F', "file", &logfile, "FILE", "read log from file"),
  90         OPT_STRING(0, "author", &force_author, "AUTHOR", "override author for commit"),
  91         OPT_CALLBACK('m', "message", &message, "MESSAGE", "specify commit message", opt_parse_m),
  92         OPT_STRING('c', "reedit-message", &edit_message, "COMMIT", "reuse and edit message from specified commit "),
  93         OPT_STRING('C', "reuse-message", &use_message, "COMMIT", "reuse message from specified commit"),
  94         OPT_BOOLEAN('s', "signoff", &signoff, "add Signed-off-by:"),
  95         OPT_STRING('t', "template", &template_file, "FILE", "use specified template file"),
  96         OPT_BOOLEAN('e', "edit", &edit_flag, "force edit of commit"),
  97
  98         OPT_GROUP("Commit contents options"),
  99         OPT_BOOLEAN('a', "all", &all, "commit all changed files"),
 100         OPT_BOOLEAN('i', "include", &also, "add specified files to index for commit"),
 101         OPT_BOOLEAN(0, "interactive", &interactive, "interactively add files"),
 102         OPT_BOOLEAN('o', "only", &only, "commit only specified files"),
 103         OPT_BOOLEAN('n', "no-verify", &no_verify, "bypass pre-commit hook"),
 104         OPT_BOOLEAN(0, "amend", &amend, "amend previous commit"),
 105         OPT_BOOLEAN('u', "untracked-files", &untracked_files, "show all untracked files"),
 106         OPT_BOOLEAN(0, "allow-empty", &allow_empty, "ok to record an empty change"),
 107         OPT_STRING(0, "cleanup", &cleanup_arg, "default", "how to strip spaces and #comments from message"),
 108
 109         OPT_END()
 110 };
 111
 112 static void rollback_index_files(void)
 113 {
 114         switch (commit_style) {
 115         case COMMIT_AS_IS:
 116                 break; /* nothing to do */
 117         case COMMIT_NORMAL:
 118                 rollback_lock_file(&index_lock);
 119                 break;
 120         case COMMIT_PARTIAL:
 121                 rollback_lock_file(&index_lock);
 122                 rollback_lock_file(&false_lock);
 123                 break;
 124         }
 125 }
 126
 127 static int commit_index_files(void)
 128 {
 129         int err = 0;
 130
 131         switch (commit_style) {
 132         case COMMIT_AS_IS:
 133                 break; /* nothing to do */
 134         case COMMIT_NORMAL:
 135                 err = commit_lock_file(&index_lock);
 136                 break;
 137         case COMMIT_PARTIAL:
 138                 err = commit_lock_file(&index_lock);
 139                 rollback_lock_file(&false_lock);
 140                 break;
 141         }
 142
 143         return err;
 144 }
 145
 146 /*
 147  * Take a union of paths in the index and the named tree (typically, "HEAD"),
 148  * and return the paths that match the given pattern in list.
 149  */
 150 static int list_paths(struct path_list *list, const char *with_tree,
 151                       const char *prefix, const char **pattern)
 152 {
 153         int i;
 154         char *m;
 155
 156         for (i = 0; pattern[i]; i++)
 157                 ;
 158         m = xcalloc(1, i);
 159
 160         if (with_tree)
 161                 overlay_tree_on_cache(with_tree, prefix);
 162
 163         for (i = 0; i < active_nr; i++) {
 164                 struct cache_entry *ce = active_cache[i];
 165                 if (ce->ce_flags & CE_UPDATE)
 166                         continue;
 167                 if (!pathspec_match(pattern, m, ce->name, 0))
 168                         continue;
 169                 path_list_insert(ce->name, list);
 170         }
 171
 172         return report_path_error(m, pattern, prefix ? strlen(prefix) : 0);
 173 }
 174
 175 static void add_remove_files(struct path_list *list)
 176 {
 177         int i;
 178         for (i = 0; i < list->nr; i++) {
 179                 struct stat st;
 180                 struct path_list_item *p = &(list->items[i]);
 181
 182                 if (!lstat(p->path, &st)) {
 183                         if (add_to_cache(p->path, &st, 0))
 184                                 die("updating files failed");
 185                 } else
 186                         remove_file_from_cache(p->path);
 187         }
 188 }
 189
 190 static void create_base_index(void)
 191 {
 192         struct tree *tree;
 193         struct unpack_trees_options opts;
 194         struct tree_desc t;
 195
 196         if (initial_commit) {
 197                 discard_cache();
 198                 return;
 199         }
 200
 201         memset(&opts, 0, sizeof(opts));
 202         opts.head_idx = 1;
 203         opts.index_only = 1;
 204         opts.merge = 1;
 205         opts.src_index = &the_index;
 206         opts.dst_index = &the_index;
 207
 208         opts.fn = oneway_merge;
 209         tree = parse_tree_indirect(head_sha1);
 210         if (!tree)
 211                 die("failed to unpack HEAD tree object");
 212         parse_tree(tree);
 213         init_tree_desc(&t, tree->buffer, tree->size);
 214         if (unpack_trees(1, &t, &opts))
 215                 exit(128); /* We've already reported the error, finish dying */
 216 }
 217
 218 static char *prepare_index(int argc, const char **argv, const char *prefix)
 219 {
 220         int fd;
 221         struct path_list partial;
 222         const char **pathspec = NULL;
 223
 224         if (interactive) {
 225                 interactive_add(argc, argv, prefix);
 226                 if (read_cache() < 0)
 227                         die("index file corrupt");
 228                 commit_style = COMMIT_AS_IS;
 229                 return get_index_file();
 230         }
 231
 232         if (read_cache() < 0)
 233                 die("index file corrupt");
 234
 235         if (*argv)
 236                 pathspec = get_pathspec(prefix, argv);
 237
 238         /*
 239          * Non partial, non as-is commit.
 240          *
 241          * (1) get the real index;
 242          * (2) update the_index as necessary;
 243          * (3) write the_index out to the real index (still locked);
 244          * (4) return the name of the locked index file.
 245          *
 246          * The caller should run hooks on the locked real index, and
 247          * (A) if all goes well, commit the real index;
 248          * (B) on failure, rollback the real index.
 249          */
 250         if (all || (also && pathspec && *pathspec)) {
 251                 int fd = hold_locked_index(&index_lock, 1);
 252                 add_files_to_cache(also ? prefix : NULL, pathspec, 0);
 253                 refresh_cache(REFRESH_QUIET);
 254                 if (write_cache(fd, active_cache, active_nr) ||
 255                     close_lock_file(&index_lock))
 256                         die("unable to write new_index file");
 257                 commit_style = COMMIT_NORMAL;
 258                 return index_lock.filename;
 259         }
 260
 261         /*
 262          * As-is commit.
 263          *
 264          * (1) return the name of the real index file.
 265          *
 266          * The caller should run hooks on the real index, and run
 267          * hooks on the real index, and create commit from the_index.
 268          * We still need to refresh the index here.
 269          */
 270         if (!pathspec || !*pathspec) {
 271                 fd = hold_locked_index(&index_lock, 1);
 272                 refresh_cache(REFRESH_QUIET);
 273                 if (write_cache(fd, active_cache, active_nr) ||
 274                     commit_locked_index(&index_lock))
 275                         die("unable to write new_index file");
 276                 commit_style = COMMIT_AS_IS;
 277                 return get_index_file();
 278         }
 279
 280         /*
 281          * A partial commit.
 282          *
 283          * (0) find the set of affected paths;
 284          * (1) get lock on the real index file;
 285          * (2) update the_index with the given paths;
 286          * (3) write the_index out to the real index (still locked);
 287          * (4) get lock on the false index file;
 288          * (5) reset the_index from HEAD;
 289          * (6) update the_index the same way as (2);
 290          * (7) write the_index out to the false index file;
 291          * (8) return the name of the false index file (still locked);
 292          *
 293          * The caller should run hooks on the locked false index, and
 294          * create commit from it.  Then
 295          * (A) if all goes well, commit the real index;
 296          * (B) on failure, rollback the real index;
 297          * In either case, rollback the false index.
 298          */
 299         commit_style = COMMIT_PARTIAL;
 300
 301         if (file_exists(git_path("MERGE_HEAD")))
 302                 die("cannot do a partial commit during a merge.");
 303
 304         memset(&partial, 0, sizeof(partial));
 305         partial.strdup_paths = 1;
 306         if (list_paths(&partial, initial_commit ? NULL : "HEAD", prefix, pathspec))
 307                 exit(1);
 308
 309         discard_cache();
 310         if (read_cache() < 0)
 311                 die("cannot read the index");
 312
 313         fd = hold_locked_index(&index_lock, 1);
 314         add_remove_files(&partial);
 315         refresh_cache(REFRESH_QUIET);
 316         if (write_cache(fd, active_cache, active_nr) ||
 317             close_lock_file(&index_lock))
 318                 die("unable to write new_index file");
 319
 320         fd = hold_lock_file_for_update(&false_lock,
 321                                        git_path("next-index-%d", getpid()), 1);
 322
 323         create_base_index();
 324         add_remove_files(&partial);
 325         refresh_cache(REFRESH_QUIET);
 326
 327         if (write_cache(fd, active_cache, active_nr) ||
 328             close_lock_file(&false_lock))
 329                 die("unable to write temporary index file");
 330
 331         discard_cache();
 332         read_cache_from(false_lock.filename);
 333
 334         return false_lock.filename;
 335 }
 336
 337 static int run_status(FILE *fp, const char *index_file, const char *prefix, int nowarn)
 338 {
 339         struct wt_status s;
 340
 341         wt_status_prepare(&s);
 342         if (wt_status_relative_paths)
 343                 s.prefix = prefix;
 344
 345         if (amend) {
 346                 s.amend = 1;
 347                 s.reference = "HEAD^1";
 348         }
 349         s.verbose = verbose;
 350         s.untracked = untracked_files;
 351         s.index_file = index_file;
 352         s.fp = fp;
 353         s.nowarn = nowarn;
 354
 355         wt_status_print(&s);
 356
 357         return s.commitable;
 358 }
 359
 360 static int run_hook(const char *index_file, const char *name, ...)
 361 {
 362         struct child_process hook;
 363         const char *argv[10], *env[2];
 364         char index[PATH_MAX];
 365         va_list args;
 366         int i;
 367
 368         va_start(args, name);
 369         argv[0] = git_path("hooks/%s", name);
 370         i = 0;
 371         do {
 372                 if (++i >= ARRAY_SIZE(argv))
 373                         die ("run_hook(): too many arguments");
 374                 argv[i] = va_arg(args, const char *);
 375         } while (argv[i]);
 376         va_end(args);
 377
 378         snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file);
 379         env[0] = index;
 380         env[1] = NULL;
 381
 382         if (access(argv[0], X_OK) < 0)
 383                 return 0;
 384
 385         memset(&hook, 0, sizeof(hook));
 386         hook.argv = argv;
 387         hook.no_stdin = 1;
 388         hook.stdout_to_stderr = 1;
 389         hook.env = env;
 390
 391         return run_command(&hook);
 392 }
 393
 394 static int is_a_merge(const unsigned char *sha1)
 395 {
 396         struct commit *commit = lookup_commit(sha1);
 397         if (!commit || parse_commit(commit))
 398                 die("could not parse HEAD commit");
 399         return !!(commit->parents && commit->parents->next);
 400 }
 401
 402 static const char sign_off_header[] = "Signed-off-by: ";
 403
 404 static void determine_author_info(void)
 405 {
 406         char *name, *email, *date;
 407
 408         name = getenv("GIT_AUTHOR_NAME");
 409         email = getenv("GIT_AUTHOR_EMAIL");
 410         date = getenv("GIT_AUTHOR_DATE");
 411
 412         if (use_message) {
 413                 const char *a, *lb, *rb, *eol;
 414
 415                 a = strstr(use_message_buffer, "\nauthor ");
 416                 if (!a)
 417                         die("invalid commit: %s", use_message);
 418
 419                 lb = strstr(a + 8, " <");
 420                 rb = strstr(a + 8, "> ");
 421                 eol = strchr(a + 8, '\n');
 422                 if (!lb || !rb || !eol)
 423                         die("invalid commit: %s", use_message);
 424
 425                 name = xstrndup(a + 8, lb - (a + 8));
 426                 email = xstrndup(lb + 2, rb - (lb + 2));
 427                 date = xstrndup(rb + 2, eol - (rb + 2));
 428         }
 429
 430         if (force_author) {
 431                 const char *lb = strstr(force_author, " <");
 432                 const char *rb = strchr(force_author, '>');
 433
 434                 if (!lb || !rb)
 435                         die("malformed --author parameter");
 436                 name = xstrndup(force_author, lb - force_author);
 437                 email = xstrndup(lb + 2, rb - (lb + 2));
 438         }
 439
 440         author_name = name;
 441         author_email = email;
 442         author_date = date;
 443 }
 444
 445 static int prepare_to_commit(const char *index_file, const char *prefix)
 446 {
 447         struct stat statbuf;
 448         int commitable, saved_color_setting;
 449         struct strbuf sb;
 450         char *buffer;
 451         FILE *fp;
 452         const char *hook_arg1 = NULL;
 453         const char *hook_arg2 = NULL;
 454         int ident_shown = 0;
 455
 456         if (!no_verify && run_hook(index_file, "pre-commit", NULL))
 457                 return 0;
 458
 459         strbuf_init(&sb, 0);
 460         if (message.len) {
 461                 strbuf_addbuf(&sb, &message);
 462                 hook_arg1 = "message";
 463         } else if (logfile && !strcmp(logfile, "-")) {
 464                 if (isatty(0))
 465                         fprintf(stderr, "(reading log message from standard input)\n");
 466                 if (strbuf_read(&sb, 0, 0) < 0)
 467                         die("could not read log from standard input");
 468                 hook_arg1 = "message";
 469         } else if (logfile) {
 470                 if (strbuf_read_file(&sb, logfile, 0) < 0)
 471                         die("could not read log file '%s': %s",
 472                             logfile, strerror(errno));
 473                 hook_arg1 = "message";
 474         } else if (use_message) {
 475                 buffer = strstr(use_message_buffer, "\n\n");
 476                 if (!buffer || buffer[2] == '\0')
 477                         die("commit has empty message");
 478                 strbuf_add(&sb, buffer + 2, strlen(buffer + 2));
 479                 hook_arg1 = "commit";
 480                 hook_arg2 = use_message;
 481         } else if (!stat(git_path("MERGE_MSG"), &statbuf)) {
 482                 if (strbuf_read_file(&sb, git_path("MERGE_MSG"), 0) < 0)
 483                         die("could not read MERGE_MSG: %s", strerror(errno));
 484                 hook_arg1 = "merge";
 485         } else if (!stat(git_path("SQUASH_MSG"), &statbuf)) {
 486                 if (strbuf_read_file(&sb, git_path("SQUASH_MSG"), 0) < 0)
 487                         die("could not read SQUASH_MSG: %s", strerror(errno));
 488                 hook_arg1 = "squash";
 489         } else if (template_file && !stat(template_file, &statbuf)) {
 490                 if (strbuf_read_file(&sb, template_file, 0) < 0)
 491                         die("could not read %s: %s",
 492                             template_file, strerror(errno));
 493                 hook_arg1 = "template";
 494         }
 495
 496         /*
 497          * This final case does not modify the template message,
 498          * it just sets the argument to the prepare-commit-msg hook.
 499          */
 500         else if (in_merge)
 501                 hook_arg1 = "merge";
 502
 503         fp = fopen(git_path(commit_editmsg), "w");
 504         if (fp == NULL)
 505                 die("could not open %s", git_path(commit_editmsg));
 506
 507         if (cleanup_mode != CLEANUP_NONE)
 508                 stripspace(&sb, 0);
 509
 510         if (signoff) {
 511                 struct strbuf sob;
 512                 int i;
 513
 514                 strbuf_init(&sob, 0);
 515                 strbuf_addstr(&sob, sign_off_header);
 516                 strbuf_addstr(&sob, fmt_name(getenv("GIT_COMMITTER_NAME"),
 517                                              getenv("GIT_COMMITTER_EMAIL")));
 518                 strbuf_addch(&sob, '\n');
 519                 for (i = sb.len - 1; i > 0 && sb.buf[i - 1] != '\n'; i--)
 520                         ; /* do nothing */
 521                 if (prefixcmp(sb.buf + i, sob.buf)) {
 522                         if (prefixcmp(sb.buf + i, sign_off_header))
 523                                 strbuf_addch(&sb, '\n');
 524                         strbuf_addbuf(&sb, &sob);
 525                 }
 526                 strbuf_release(&sob);
 527         }
 528
 529         if (fwrite(sb.buf, 1, sb.len, fp) < sb.len)
 530                 die("could not write commit template: %s", strerror(errno));
 531
 532         strbuf_release(&sb);
 533
 534         determine_author_info();
 535
 536         /* This checks if committer ident is explicitly given */
 537         git_committer_info(0);
 538         if (use_editor) {
 539                 char *author_ident;
 540                 const char *committer_ident;
 541
 542                 if (in_merge)
 543                         fprintf(fp,
 544                                 "#\n"
 545                                 "# It looks like you may be committing a MERGE.\n"
 546                                 "# If this is not correct, please remove the file\n"
 547                                 "#      %s\n"
 548                                 "# and try again.\n"
 549                                 "#\n",
 550                                 git_path("MERGE_HEAD"));
 551
 552                 fprintf(fp,
 553                         "\n"
 554                         "# Please enter the commit message for your changes.\n"
 555                         "# (Comment lines starting with '#' will ");
 556                 if (cleanup_mode == CLEANUP_ALL)
 557                         fprintf(fp, "not be included)\n");
 558                 else /* CLEANUP_SPACE, that is. */
 559                         fprintf(fp, "be kept.\n"
 560                                 "# You can remove them yourself if you want to)\n");
 561                 if (only_include_assumed)
 562                         fprintf(fp, "# %s\n", only_include_assumed);
 563
 564                 author_ident = xstrdup(fmt_name(author_name, author_email));
 565                 committer_ident = fmt_name(getenv("GIT_COMMITTER_NAME"),
 566                                            getenv("GIT_COMMITTER_EMAIL"));
 567                 if (strcmp(author_ident, committer_ident))
 568                         fprintf(fp,
 569                                 "%s"
 570                                 "# Author:    %s\n",
 571                                 ident_shown++ ? "" : "#\n",
 572                                 author_ident);
 573                 free(author_ident);
 574
 575                 if (!user_ident_explicitly_given)
 576                         fprintf(fp,
 577                                 "%s"
 578                                 "# Committer: %s\n",
 579                                 ident_shown++ ? "" : "#\n",
 580                                 committer_ident);
 581
 582                 if (ident_shown)
 583                         fprintf(fp, "#\n");
 584
 585                 saved_color_setting = wt_status_use_color;
 586                 wt_status_use_color = 0;
 587                 commitable = run_status(fp, index_file, prefix, 1);
 588                 wt_status_use_color = saved_color_setting;
 589         } else {
 590                 struct rev_info rev;
 591                 unsigned char sha1[20];
 592                 const char *parent = "HEAD";
 593
 594                 if (!active_nr && read_cache() < 0)
 595                         die("Cannot read index");
 596
 597                 if (amend)
 598                         parent = "HEAD^1";
 599
 600                 if (get_sha1(parent, sha1))
 601                         commitable = !!active_nr;
 602                 else {
 603                         init_revisions(&rev, "");
 604                         rev.abbrev = 0;
 605                         setup_revisions(0, NULL, &rev, parent);
 606                         DIFF_OPT_SET(&rev.diffopt, QUIET);
 607                         DIFF_OPT_SET(&rev.diffopt, EXIT_WITH_STATUS);
 608                         run_diff_index(&rev, 1 /* cached */);
 609
 610                         commitable = !!DIFF_OPT_TST(&rev.diffopt, HAS_CHANGES);
 611                 }
 612         }
 613
 614         fclose(fp);
 615
 616         if (!commitable && !in_merge && !allow_empty &&
 617             !(amend && is_a_merge(head_sha1))) {
 618                 run_status(stdout, index_file, prefix, 0);
 619                 unlink(commit_editmsg);
 620                 return 0;
 621         }
 622
 623         /*
 624          * Re-read the index as pre-commit hook could have updated it,
 625          * and write it out as a tree.  We must do this before we invoke
 626          * the editor and after we invoke run_status above.
 627          */
 628         discard_cache();
 629         read_cache_from(index_file);
 630         if (!active_cache_tree)
 631                 active_cache_tree = cache_tree();
 632         if (cache_tree_update(active_cache_tree,
 633                               active_cache, active_nr, 0, 0) < 0) {
 634                 error("Error building trees");
 635                 return 0;
 636         }
 637
 638         if (run_hook(index_file, "prepare-commit-msg",
 639                      git_path(commit_editmsg), hook_arg1, hook_arg2, NULL))
 640                 return 0;
 641
 642         if (use_editor) {
 643                 char index[PATH_MAX];
 644                 const char *env[2] = { index, NULL };
 645                 snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file);
 646                 launch_editor(git_path(commit_editmsg), NULL, env);
 647         }
 648
 649         if (!no_verify &&
 650             run_hook(index_file, "commit-msg", git_path(commit_editmsg), NULL)) {
 651                 return 0;
 652         }
 653
 654         return 1;
 655 }
 656
 657 /*
 658  * Find out if the message starting at position 'start' in the strbuf
 659  * contains only whitespace and Signed-off-by lines.
 660  */
 661 static int message_is_empty(struct strbuf *sb, int start)
 662 {
 663         struct strbuf tmpl;
 664         const char *nl;
 665         int eol, i;
 666
 667         if (cleanup_mode == CLEANUP_NONE && sb->len)
 668                 return 0;
 669
 670         /* See if the template is just a prefix of the message. */
 671         strbuf_init(&tmpl, 0);
 672         if (template_file && strbuf_read_file(&tmpl, template_file, 0) > 0) {
 673                 stripspace(&tmpl, cleanup_mode == CLEANUP_ALL);
 674                 if (start + tmpl.len <= sb->len &&
 675                     memcmp(tmpl.buf, sb->buf + start, tmpl.len) == 0)
 676                         start += tmpl.len;
 677         }
 678         strbuf_release(&tmpl);
 679
 680         /* Check if the rest is just whitespace and Signed-of-by's. */
 681         for (i = start; i < sb->len; i++) {
 682                 nl = memchr(sb->buf + i, '\n', sb->len - i);
 683                 if (nl)
 684                         eol = nl - sb->buf;
 685                 else
 686                         eol = sb->len;
 687
 688                 if (strlen(sign_off_header) <= eol - i &&
 689                     !prefixcmp(sb->buf + i, sign_off_header)) {
 690                         i = eol;
 691                         continue;
 692                 }
 693                 while (i < eol)
 694                         if (!isspace(sb->buf[i++]))
 695                                 return 0;
 696         }
 697
 698         return 1;
 699 }
 700
 701 static int parse_and_validate_options(int argc, const char *argv[],
 702                                       const char * const usage[])
 703 {
 704         int f = 0;
 705
 706         argc = parse_options(argc, argv, builtin_commit_options, usage, 0);
 707
 708         if (logfile || message.len || use_message)
 709                 use_editor = 0;
 710         if (edit_flag)
 711                 use_editor = 1;
 712         if (!use_editor)
 713                 setenv("GIT_EDITOR", ":", 1);
 714
 715         if (get_sha1("HEAD", head_sha1))
 716                 initial_commit = 1;
 717
 718         if (!get_sha1("MERGE_HEAD", merge_head_sha1))
 719                 in_merge = 1;
 720
 721         /* Sanity check options */
 722         if (amend && initial_commit)
 723                 die("You have nothing to amend.");
 724         if (amend && in_merge)
 725                 die("You are in the middle of a merge -- cannot amend.");
 726
 727         if (use_message)
 728                 f++;
 729         if (edit_message)
 730                 f++;
 731         if (logfile)
 732                 f++;
 733         if (f > 1)
 734                 die("Only one of -c/-C/-F can be used.");
 735         if (message.len && f > 0)
 736                 die("Option -m cannot be combined with -c/-C/-F.");
 737         if (edit_message)
 738                 use_message = edit_message;
 739         if (amend && !use_message)
 740                 use_message = "HEAD";
 741         if (use_message) {
 742                 unsigned char sha1[20];
 743                 static char utf8[] = "UTF-8";
 744                 const char *out_enc;
 745                 char *enc, *end;
 746                 struct commit *commit;
 747
 748                 if (get_sha1(use_message, sha1))
 749                         die("could not lookup commit %s", use_message);
 750                 commit = lookup_commit_reference(sha1);
 751                 if (!commit || parse_commit(commit))
 752                         die("could not parse commit %s", use_message);
 753
 754                 enc = strstr(commit->buffer, "\nencoding");
 755                 if (enc) {
 756                         end = strchr(enc + 10, '\n');
 757                         enc = xstrndup(enc + 10, end - (enc + 10));
 758                 } else {
 759                         enc = utf8;
 760                 }
 761                 out_enc = git_commit_encoding ? git_commit_encoding : utf8;
 762
 763                 if (strcmp(out_enc, enc))
 764                         use_message_buffer =
 765                                 reencode_string(commit->buffer, out_enc, enc);
 766
 767                 /*
 768                  * If we failed to reencode the buffer, just copy it
 769                  * byte for byte so the user can try to fix it up.
 770                  * This also handles the case where input and output
 771                  * encodings are identical.
 772                  */
 773                 if (use_message_buffer == NULL)
 774                         use_message_buffer = xstrdup(commit->buffer);
 775                 if (enc != utf8)
 776                         free(enc);
 777         }
 778
 779         if (!!also + !!only + !!all + !!interactive > 1)
 780                 die("Only one of --include/--only/--all/--interactive can be used.");
 781         if (argc == 0 && (also || (only && !amend)))
 782                 die("No paths with --include/--only does not make sense.");
 783         if (argc == 0 && only && amend)
 784                 only_include_assumed = "Clever... amending the last one with dirty index.";
 785         if (argc > 0 && !also && !only)
 786                 only_include_assumed = "Explicit paths specified without -i nor -o; assuming --only paths...";
 787         if (!cleanup_arg || !strcmp(cleanup_arg, "default"))
 788                 cleanup_mode = use_editor ? CLEANUP_ALL : CLEANUP_SPACE;
 789         else if (!strcmp(cleanup_arg, "verbatim"))
 790                 cleanup_mode = CLEANUP_NONE;
 791         else if (!strcmp(cleanup_arg, "whitespace"))
 792                 cleanup_mode = CLEANUP_SPACE;
 793         else if (!strcmp(cleanup_arg, "strip"))
 794                 cleanup_mode = CLEANUP_ALL;
 795         else
 796                 die("Invalid cleanup mode %s", cleanup_arg);
 797
 798         if (all && argc > 0)
 799                 die("Paths with -a does not make sense.");
 800         else if (interactive && argc > 0)
 801                 die("Paths with --interactive does not make sense.");
 802
 803         return argc;
 804 }
 805
 806 int cmd_status(int argc, const char **argv, const char *prefix)
 807 {
 808         const char *index_file;
 809         int commitable;
 810
 811         git_config(git_status_config, NULL);
 812
 813         if (wt_status_use_color == -1)
 814                 wt_status_use_color = git_use_color_default;
 815
 816         argc = parse_and_validate_options(argc, argv, builtin_status_usage);
 817
 818         index_file = prepare_index(argc, argv, prefix);
 819
 820         commitable = run_status(stdout, index_file, prefix, 0);
 821
 822         rollback_index_files();
 823
 824         return commitable ? 0 : 1;
 825 }
 826
 827 static void print_summary(const char *prefix, const unsigned char *sha1)
 828 {
 829         struct rev_info rev;
 830         struct commit *commit;
 831
 832         commit = lookup_commit(sha1);
 833         if (!commit)
 834                 die("couldn't look up newly created commit");
 835         if (!commit || parse_commit(commit))
 836                 die("could not parse newly created commit");
 837
 838         init_revisions(&rev, prefix);
 839         setup_revisions(0, NULL, &rev, NULL);
 840
 841         rev.abbrev = 0;
 842         rev.diff = 1;
 843         rev.diffopt.output_format =
 844                 DIFF_FORMAT_SHORTSTAT | DIFF_FORMAT_SUMMARY;
 845
 846         rev.verbose_header = 1;
 847         rev.show_root_diff = 1;
 848         get_commit_format("format:%h: %s", &rev);
 849         rev.always_show_header = 0;
 850         rev.diffopt.detect_rename = 1;
 851         rev.diffopt.rename_limit = 100;
 852         rev.diffopt.break_opt = 0;
 853         diff_setup_done(&rev.diffopt);
 854
 855         printf("Created %scommit ", initial_commit ? "initial " : "");
 856
 857         if (!log_tree_commit(&rev, commit)) {
 858                 struct strbuf buf = STRBUF_INIT;
 859                 format_commit_message(commit, "%h: %s", &buf);
 860                 printf("%s\n", buf.buf);
 861                 strbuf_release(&buf);
 862         }
 863 }
 864
 865 int git_commit_config(const char *k, const char *v, void *cb)
 866 {
 867         if (!strcmp(k, "commit.template")) {
 868                 if (!v)
 869                         return config_error_nonbool(v);
 870                 template_file = xstrdup(v);
 871                 return 0;
 872         }
 873
 874         return git_status_config(k, v, cb);
 875 }
 876
 877 static const char commit_utf8_warn[] =
 878 "Warning: commit message does not conform to UTF-8.\n"
 879 "You may want to amend it after fixing the message, or set the config\n"
 880 "variable i18n.commitencoding to the encoding your project uses.\n";
 881
 882 static void add_parent(struct strbuf *sb, const unsigned char *sha1)
 883 {
 884         struct object *obj = parse_object(sha1);
 885         const char *parent = sha1_to_hex(sha1);
 886         const char *cp;
 887
 888         if (!obj)
 889                 die("Unable to find commit parent %s", parent);
 890         if (obj->type != OBJ_COMMIT)
 891                 die("Parent %s isn't a proper commit", parent);
 892
 893         for (cp = sb->buf; cp && (cp = strstr(cp, "\nparent ")); cp += 8) {
 894                 if (!memcmp(cp + 8, parent, 40) && cp[48] == '\n') {
 895                         error("duplicate parent %s ignored", parent);
 896                         return;
 897                 }
 898         }
 899         strbuf_addf(sb, "parent %s\n", parent);
 900 }
 901
 902 int cmd_commit(int argc, const char **argv, const char *prefix)
 903 {
 904         int header_len;
 905         struct strbuf sb;
 906         const char *index_file, *reflog_msg;
 907         char *nl, *p;
 908         unsigned char commit_sha1[20];
 909         struct ref_lock *ref_lock;
 910
 911         git_config(git_commit_config, NULL);
 912
 913         argc = parse_and_validate_options(argc, argv, builtin_commit_usage);
 914
 915         index_file = prepare_index(argc, argv, prefix);
 916
 917         /* Set up everything for writing the commit object.  This includes
 918            running hooks, writing the trees, and interacting with the user.  */
 919         if (!prepare_to_commit(index_file, prefix)) {
 920                 rollback_index_files();
 921                 return 1;
 922         }
 923
 924         /*
 925          * The commit object
 926          */
 927         strbuf_init(&sb, 0);
 928         strbuf_addf(&sb, "tree %s\n",
 929                     sha1_to_hex(active_cache_tree->sha1));
 930
 931         /* Determine parents */
 932         if (initial_commit) {
 933                 reflog_msg = "commit (initial)";
 934         } else if (amend) {
 935                 struct commit_list *c;
 936                 struct commit *commit;
 937
 938                 reflog_msg = "commit (amend)";
 939                 commit = lookup_commit(head_sha1);
 940                 if (!commit || parse_commit(commit))
 941                         die("could not parse HEAD commit");
 942
 943                 for (c = commit->parents; c; c = c->next)
 944                         add_parent(&sb, c->item->object.sha1);
 945         } else if (in_merge) {
 946                 struct strbuf m;
 947                 FILE *fp;
 948
 949                 reflog_msg = "commit (merge)";
 950                 add_parent(&sb, head_sha1);
 951                 strbuf_init(&m, 0);
 952                 fp = fopen(git_path("MERGE_HEAD"), "r");
 953                 if (fp == NULL)
 954                         die("could not open %s for reading: %s",
 955                             git_path("MERGE_HEAD"), strerror(errno));
 956                 while (strbuf_getline(&m, fp, '\n') != EOF) {
 957                         unsigned char sha1[20];
 958                         if (get_sha1_hex(m.buf, sha1) < 0)
 959                                 die("Corrupt MERGE_HEAD file (%s)", m.buf);
 960                         add_parent(&sb, sha1);
 961                 }
 962                 fclose(fp);
 963                 strbuf_release(&m);
 964         } else {
 965                 reflog_msg = "commit";
 966                 strbuf_addf(&sb, "parent %s\n", sha1_to_hex(head_sha1));
 967         }
 968
 969         strbuf_addf(&sb, "author %s\n",
 970                     fmt_ident(author_name, author_email, author_date, IDENT_ERROR_ON_NO_NAME));
 971         strbuf_addf(&sb, "committer %s\n", git_committer_info(IDENT_ERROR_ON_NO_NAME));
 972         if (!is_encoding_utf8(git_commit_encoding))
 973                 strbuf_addf(&sb, "encoding %s\n", git_commit_encoding);
 974         strbuf_addch(&sb, '\n');
 975
 976         /* Finally, get the commit message */
 977         header_len = sb.len;
 978         if (strbuf_read_file(&sb, git_path(commit_editmsg), 0) < 0) {
 979                 rollback_index_files();
 980                 die("could not read commit message");
 981         }
 982
 983         /* Truncate the message just before the diff, if any. */
 984         p = strstr(sb.buf, "\ndiff --git a/");
 985         if (p != NULL)
 986                 strbuf_setlen(&sb, p - sb.buf + 1);
 987
 988         if (cleanup_mode != CLEANUP_NONE)
 989                 stripspace(&sb, cleanup_mode == CLEANUP_ALL);
 990         if (sb.len < header_len || message_is_empty(&sb, header_len)) {
 991                 rollback_index_files();
 992                 die("no commit message?  aborting commit.");
 993         }
 994         strbuf_addch(&sb, '\0');
 995         if (is_encoding_utf8(git_commit_encoding) && !is_utf8(sb.buf))
 996                 fprintf(stderr, commit_utf8_warn);
 997
 998         if (write_sha1_file(sb.buf, sb.len - 1, commit_type, commit_sha1)) {
 999                 rollback_index_files();
1000                 die("failed to write commit object");
1001         }
1002
1003         ref_lock = lock_any_ref_for_update("HEAD",
1004                                            initial_commit ? NULL : head_sha1,
1005                                            0);
1006
1007         nl = strchr(sb.buf + header_len, '\n');
1008         if (nl)
1009                 strbuf_setlen(&sb, nl + 1 - sb.buf);
1010         else
1011                 strbuf_addch(&sb, '\n');
1012         strbuf_remove(&sb, 0, header_len);
1013         strbuf_insert(&sb, 0, reflog_msg, strlen(reflog_msg));
1014         strbuf_insert(&sb, strlen(reflog_msg), ": ", 2);
1015
1016         if (!ref_lock) {
1017                 rollback_index_files();
1018                 die("cannot lock HEAD ref");
1019         }
1020         if (write_ref_sha1(ref_lock, commit_sha1, sb.buf) < 0) {
1021                 rollback_index_files();
1022                 die("cannot update HEAD ref");
1023         }
1024
1025         unlink(git_path("MERGE_HEAD"));
1026         unlink(git_path("MERGE_MSG"));
1027         unlink(git_path("SQUASH_MSG"));
1028
1029         if (commit_index_files())
1030                 die ("Repository has been updated, but unable to write\n"
1031                      "new_index file. Check that disk is not full or quota is\n"
1032                      "not exceeded, and then \"git reset HEAD\" to recover.");
1033
1034         rerere();
1035         run_hook(get_index_file(), "post-commit", NULL);
1036         if (!quiet)
1037                 print_summary(prefix, commit_sha1);
1038
1039         return 0;
1040 }