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