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