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