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                         add_to_cache(p->path, &st, 0);
 183                 else
 184                         remove_file_from_cache(p->path);
 185         }
 186 }
 187
 188 static void create_base_index(void)
 189 {
 190         struct tree *tree;
 191         struct unpack_trees_options opts;
 192         struct tree_desc t;
 193
 194         if (initial_commit) {
 195                 discard_cache();
 196                 return;
 197         }
 198
 199         memset(&opts, 0, sizeof(opts));
 200         opts.head_idx = 1;
 201         opts.index_only = 1;
 202         opts.merge = 1;
 203         opts.src_index = &the_index;
 204         opts.dst_index = &the_index;
 205
 206         opts.fn = oneway_merge;
 207         tree = parse_tree_indirect(head_sha1);
 208         if (!tree)
 209                 die("failed to unpack HEAD tree object");
 210         parse_tree(tree);
 211         init_tree_desc(&t, tree->buffer, tree->size);
 212         if (unpack_trees(1, &t, &opts))
 213                 exit(128); /* We've already reported the error, finish dying */
 214 }
 215
 216 static char *prepare_index(int argc, const char **argv, const char *prefix)
 217 {
 218         int fd;
 219         struct path_list partial;
 220         const char **pathspec = NULL;
 221
 222         if (interactive) {
 223                 interactive_add(argc, argv, prefix);
 224                 commit_style = COMMIT_AS_IS;
 225                 return get_index_file();
 226         }
 227
 228         if (read_cache() < 0)
 229                 die("index file corrupt");
 230
 231         if (*argv)
 232                 pathspec = get_pathspec(prefix, argv);
 233
 234         /*
 235          * Non partial, non as-is commit.
 236          *
 237          * (1) get the real index;
 238          * (2) update the_index as necessary;
 239          * (3) write the_index out to the real index (still locked);
 240          * (4) return the name of the locked index file.
 241          *
 242          * The caller should run hooks on the locked real index, and
 243          * (A) if all goes well, commit the real index;
 244          * (B) on failure, rollback the real index.
 245          */
 246         if (all || (also && pathspec && *pathspec)) {
 247                 int fd = hold_locked_index(&index_lock, 1);
 248                 add_files_to_cache(0, also ? prefix : NULL, pathspec);
 249                 refresh_cache(REFRESH_QUIET);
 250                 if (write_cache(fd, active_cache, active_nr) ||
 251                     close_lock_file(&index_lock))
 252                         die("unable to write new_index file");
 253                 commit_style = COMMIT_NORMAL;
 254                 return index_lock.filename;
 255         }
 256
 257         /*
 258          * As-is commit.
 259          *
 260          * (1) return the name of the real index file.
 261          *
 262          * The caller should run hooks on the real index, and run
 263          * hooks on the real index, and create commit from the_index.
 264          * We still need to refresh the index here.
 265          */
 266         if (!pathspec || !*pathspec) {
 267                 fd = hold_locked_index(&index_lock, 1);
 268                 refresh_cache(REFRESH_QUIET);
 269                 if (write_cache(fd, active_cache, active_nr) ||
 270                     commit_locked_index(&index_lock))
 271                         die("unable to write new_index file");
 272                 commit_style = COMMIT_AS_IS;
 273                 return get_index_file();
 274         }
 275
 276         /*
 277          * A partial commit.
 278          *
 279          * (0) find the set of affected paths;
 280          * (1) get lock on the real index file;
 281          * (2) update the_index with the given paths;
 282          * (3) write the_index out to the real index (still locked);
 283          * (4) get lock on the false index file;
 284          * (5) reset the_index from HEAD;
 285          * (6) update the_index the same way as (2);
 286          * (7) write the_index out to the false index file;
 287          * (8) return the name of the false index file (still locked);
 288          *
 289          * The caller should run hooks on the locked false index, and
 290          * create commit from it.  Then
 291          * (A) if all goes well, commit the real index;
 292          * (B) on failure, rollback the real index;
 293          * In either case, rollback the false index.
 294          */
 295         commit_style = COMMIT_PARTIAL;
 296
 297         if (file_exists(git_path("MERGE_HEAD")))
 298                 die("cannot do a partial commit during a merge.");
 299
 300         memset(&partial, 0, sizeof(partial));
 301         partial.strdup_paths = 1;
 302         if (list_paths(&partial, initial_commit ? NULL : "HEAD", prefix, pathspec))
 303                 exit(1);
 304
 305         discard_cache();
 306         if (read_cache() < 0)
 307                 die("cannot read the index");
 308
 309         fd = hold_locked_index(&index_lock, 1);
 310         add_remove_files(&partial);
 311         refresh_cache(REFRESH_QUIET);
 312         if (write_cache(fd, active_cache, active_nr) ||
 313             close_lock_file(&index_lock))
 314                 die("unable to write new_index file");
 315
 316         fd = hold_lock_file_for_update(&false_lock,
 317                                        git_path("next-index-%d", getpid()), 1);
 318
 319         create_base_index();
 320         add_remove_files(&partial);
 321         refresh_cache(REFRESH_QUIET);
 322
 323         if (write_cache(fd, active_cache, active_nr) ||
 324             close_lock_file(&false_lock))
 325                 die("unable to write temporary index file");
 326
 327         discard_cache();
 328         read_cache_from(false_lock.filename);
 329
 330         return false_lock.filename;
 331 }
 332
 333 static int run_status(FILE *fp, const char *index_file, const char *prefix, int nowarn)
 334 {
 335         struct wt_status s;
 336
 337         wt_status_prepare(&s);
 338         if (wt_status_relative_paths)
 339                 s.prefix = prefix;
 340
 341         if (amend) {
 342                 s.amend = 1;
 343                 s.reference = "HEAD^1";
 344         }
 345         s.verbose = verbose;
 346         s.untracked = untracked_files;
 347         s.index_file = index_file;
 348         s.fp = fp;
 349         s.nowarn = nowarn;
 350
 351         wt_status_print(&s);
 352
 353         return s.commitable;
 354 }
 355
 356 static int run_hook(const char *index_file, const char *name, ...)
 357 {
 358         struct child_process hook;
 359         const char *argv[10], *env[2];
 360         char index[PATH_MAX];
 361         va_list args;
 362         int i;
 363
 364         va_start(args, name);
 365         argv[0] = git_path("hooks/%s", name);
 366         i = 0;
 367         do {
 368                 if (++i >= ARRAY_SIZE(argv))
 369                         die ("run_hook(): too many arguments");
 370                 argv[i] = va_arg(args, const char *);
 371         } while (argv[i]);
 372         va_end(args);
 373
 374         snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file);
 375         env[0] = index;
 376         env[1] = NULL;
 377
 378         if (access(argv[0], X_OK) < 0)
 379                 return 0;
 380
 381         memset(&hook, 0, sizeof(hook));
 382         hook.argv = argv;
 383         hook.no_stdin = 1;
 384         hook.stdout_to_stderr = 1;
 385         hook.env = env;
 386
 387         return run_command(&hook);
 388 }
 389
 390 static int is_a_merge(const unsigned char *sha1)
 391 {
 392         struct commit *commit = lookup_commit(sha1);
 393         if (!commit || parse_commit(commit))
 394                 die("could not parse HEAD commit");
 395         return !!(commit->parents && commit->parents->next);
 396 }
 397
 398 static const char sign_off_header[] = "Signed-off-by: ";
 399
 400 static int prepare_to_commit(const char *index_file, const char *prefix)
 401 {
 402         struct stat statbuf;
 403         int commitable, saved_color_setting;
 404         struct strbuf sb;
 405         char *buffer;
 406         FILE *fp;
 407         const char *hook_arg1 = NULL;
 408         const char *hook_arg2 = NULL;
 409
 410         if (!no_verify && run_hook(index_file, "pre-commit", NULL))
 411                 return 0;
 412
 413         strbuf_init(&sb, 0);
 414         if (message.len) {
 415                 strbuf_addbuf(&sb, &message);
 416                 hook_arg1 = "message";
 417         } else if (logfile && !strcmp(logfile, "-")) {
 418                 if (isatty(0))
 419                         fprintf(stderr, "(reading log message from standard input)\n");
 420                 if (strbuf_read(&sb, 0, 0) < 0)
 421                         die("could not read log from standard input");
 422                 hook_arg1 = "message";
 423         } else if (logfile) {
 424                 if (strbuf_read_file(&sb, logfile, 0) < 0)
 425                         die("could not read log file '%s': %s",
 426                             logfile, strerror(errno));
 427                 hook_arg1 = "message";
 428         } else if (use_message) {
 429                 buffer = strstr(use_message_buffer, "\n\n");
 430                 if (!buffer || buffer[2] == '\0')
 431                         die("commit has empty message");
 432                 strbuf_add(&sb, buffer + 2, strlen(buffer + 2));
 433                 hook_arg1 = "commit";
 434                 hook_arg2 = use_message;
 435         } else if (!stat(git_path("MERGE_MSG"), &statbuf)) {
 436                 if (strbuf_read_file(&sb, git_path("MERGE_MSG"), 0) < 0)
 437                         die("could not read MERGE_MSG: %s", strerror(errno));
 438                 hook_arg1 = "merge";
 439         } else if (!stat(git_path("SQUASH_MSG"), &statbuf)) {
 440                 if (strbuf_read_file(&sb, git_path("SQUASH_MSG"), 0) < 0)
 441                         die("could not read SQUASH_MSG: %s", strerror(errno));
 442                 hook_arg1 = "squash";
 443         } else if (template_file && !stat(template_file, &statbuf)) {
 444                 if (strbuf_read_file(&sb, template_file, 0) < 0)
 445                         die("could not read %s: %s",
 446                             template_file, strerror(errno));
 447                 hook_arg1 = "template";
 448         }
 449
 450         /*
 451          * This final case does not modify the template message,
 452          * it just sets the argument to the prepare-commit-msg hook.
 453          */
 454         else if (in_merge)
 455                 hook_arg1 = "merge";
 456
 457         fp = fopen(git_path(commit_editmsg), "w");
 458         if (fp == NULL)
 459                 die("could not open %s", git_path(commit_editmsg));
 460
 461         if (cleanup_mode != CLEANUP_NONE)
 462                 stripspace(&sb, 0);
 463
 464         if (signoff) {
 465                 struct strbuf sob;
 466                 int i;
 467
 468                 strbuf_init(&sob, 0);
 469                 strbuf_addstr(&sob, sign_off_header);
 470                 strbuf_addstr(&sob, fmt_name(getenv("GIT_COMMITTER_NAME"),
 471                                              getenv("GIT_COMMITTER_EMAIL")));
 472                 strbuf_addch(&sob, '\n');
 473                 for (i = sb.len - 1; i > 0 && sb.buf[i - 1] != '\n'; i--)
 474                         ; /* do nothing */
 475                 if (prefixcmp(sb.buf + i, sob.buf)) {
 476                         if (prefixcmp(sb.buf + i, sign_off_header))
 477                                 strbuf_addch(&sb, '\n');
 478                         strbuf_addbuf(&sb, &sob);
 479                 }
 480                 strbuf_release(&sob);
 481         }
 482
 483         if (fwrite(sb.buf, 1, sb.len, fp) < sb.len)
 484                 die("could not write commit template: %s", strerror(errno));
 485
 486         strbuf_release(&sb);
 487
 488         if (use_editor) {
 489                 if (in_merge)
 490                         fprintf(fp,
 491                                 "#\n"
 492                                 "# It looks like you may be committing a MERGE.\n"
 493                                 "# If this is not correct, please remove the file\n"
 494                                 "#      %s\n"
 495                                 "# and try again.\n"
 496                                 "#\n",
 497                                 git_path("MERGE_HEAD"));
 498
 499                 fprintf(fp,
 500                         "\n"
 501                         "# Please enter the commit message for your changes.\n"
 502                         "# (Comment lines starting with '#' will ");
 503                 if (cleanup_mode == CLEANUP_ALL)
 504                         fprintf(fp, "not be included)\n");
 505                 else /* CLEANUP_SPACE, that is. */
 506                         fprintf(fp, "be kept.\n"
 507                                 "# You can remove them yourself if you want to)\n");
 508                 if (only_include_assumed)
 509                         fprintf(fp, "# %s\n", only_include_assumed);
 510
 511                 saved_color_setting = wt_status_use_color;
 512                 wt_status_use_color = 0;
 513                 commitable = run_status(fp, index_file, prefix, 1);
 514                 wt_status_use_color = saved_color_setting;
 515         } else {
 516                 struct rev_info rev;
 517                 unsigned char sha1[20];
 518                 const char *parent = "HEAD";
 519
 520                 if (!active_nr && read_cache() < 0)
 521                         die("Cannot read index");
 522
 523                 if (amend)
 524                         parent = "HEAD^1";
 525
 526                 if (get_sha1(parent, sha1))
 527                         commitable = !!active_nr;
 528                 else {
 529                         init_revisions(&rev, "");
 530                         rev.abbrev = 0;
 531                         setup_revisions(0, NULL, &rev, parent);
 532                         DIFF_OPT_SET(&rev.diffopt, QUIET);
 533                         DIFF_OPT_SET(&rev.diffopt, EXIT_WITH_STATUS);
 534                         run_diff_index(&rev, 1 /* cached */);
 535
 536                         commitable = !!DIFF_OPT_TST(&rev.diffopt, HAS_CHANGES);
 537                 }
 538         }
 539
 540         fclose(fp);
 541
 542         if (!commitable && !in_merge && !allow_empty &&
 543             !(amend && is_a_merge(head_sha1))) {
 544                 run_status(stdout, index_file, prefix, 0);
 545                 unlink(commit_editmsg);
 546                 return 0;
 547         }
 548
 549         /*
 550          * Re-read the index as pre-commit hook could have updated it,
 551          * and write it out as a tree.  We must do this before we invoke
 552          * the editor and after we invoke run_status above.
 553          */
 554         discard_cache();
 555         read_cache_from(index_file);
 556         if (!active_cache_tree)
 557                 active_cache_tree = cache_tree();
 558         if (cache_tree_update(active_cache_tree,
 559                               active_cache, active_nr, 0, 0) < 0) {
 560                 error("Error building trees");
 561                 return 0;
 562         }
 563
 564         if (run_hook(index_file, "prepare-commit-msg",
 565                      git_path(commit_editmsg), hook_arg1, hook_arg2, NULL))
 566                 return 0;
 567
 568         if (use_editor) {
 569                 char index[PATH_MAX];
 570                 const char *env[2] = { index, NULL };
 571                 snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file);
 572                 launch_editor(git_path(commit_editmsg), NULL, env);
 573         }
 574
 575         if (!no_verify &&
 576             run_hook(index_file, "commit-msg", git_path(commit_editmsg), NULL)) {
 577                 return 0;
 578         }
 579
 580         return 1;
 581 }
 582
 583 /*
 584  * Find out if the message starting at position 'start' in the strbuf
 585  * contains only whitespace and Signed-off-by lines.
 586  */
 587 static int message_is_empty(struct strbuf *sb, int start)
 588 {
 589         struct strbuf tmpl;
 590         const char *nl;
 591         int eol, i;
 592
 593         if (cleanup_mode == CLEANUP_NONE && sb->len)
 594                 return 0;
 595
 596         /* See if the template is just a prefix of the message. */
 597         strbuf_init(&tmpl, 0);
 598         if (template_file && strbuf_read_file(&tmpl, template_file, 0) > 0) {
 599                 stripspace(&tmpl, cleanup_mode == CLEANUP_ALL);
 600                 if (start + tmpl.len <= sb->len &&
 601                     memcmp(tmpl.buf, sb->buf + start, tmpl.len) == 0)
 602                         start += tmpl.len;
 603         }
 604         strbuf_release(&tmpl);
 605
 606         /* Check if the rest is just whitespace and Signed-of-by's. */
 607         for (i = start; i < sb->len; i++) {
 608                 nl = memchr(sb->buf + i, '\n', sb->len - i);
 609                 if (nl)
 610                         eol = nl - sb->buf;
 611                 else
 612                         eol = sb->len;
 613
 614                 if (strlen(sign_off_header) <= eol - i &&
 615                     !prefixcmp(sb->buf + i, sign_off_header)) {
 616                         i = eol;
 617                         continue;
 618                 }
 619                 while (i < eol)
 620                         if (!isspace(sb->buf[i++]))
 621                                 return 0;
 622         }
 623
 624         return 1;
 625 }
 626
 627 static void determine_author_info(struct strbuf *sb)
 628 {
 629         char *name, *email, *date;
 630
 631         name = getenv("GIT_AUTHOR_NAME");
 632         email = getenv("GIT_AUTHOR_EMAIL");
 633         date = getenv("GIT_AUTHOR_DATE");
 634
 635         if (use_message) {
 636                 const char *a, *lb, *rb, *eol;
 637
 638                 a = strstr(use_message_buffer, "\nauthor ");
 639                 if (!a)
 640                         die("invalid commit: %s", use_message);
 641
 642                 lb = strstr(a + 8, " <");
 643                 rb = strstr(a + 8, "> ");
 644                 eol = strchr(a + 8, '\n');
 645                 if (!lb || !rb || !eol)
 646                         die("invalid commit: %s", use_message);
 647
 648                 name = xstrndup(a + 8, lb - (a + 8));
 649                 email = xstrndup(lb + 2, rb - (lb + 2));
 650                 date = xstrndup(rb + 2, eol - (rb + 2));
 651         }
 652
 653         if (force_author) {
 654                 const char *lb = strstr(force_author, " <");
 655                 const char *rb = strchr(force_author, '>');
 656
 657                 if (!lb || !rb)
 658                         die("malformed --author parameter");
 659                 name = xstrndup(force_author, lb - force_author);
 660                 email = xstrndup(lb + 2, rb - (lb + 2));
 661         }
 662
 663         strbuf_addf(sb, "author %s\n", fmt_ident(name, email, date, IDENT_ERROR_ON_NO_NAME));
 664 }
 665
 666 static int parse_and_validate_options(int argc, const char *argv[],
 667                                       const char * const usage[])
 668 {
 669         int f = 0;
 670
 671         argc = parse_options(argc, argv, builtin_commit_options, usage, 0);
 672
 673         if (logfile || message.len || use_message)
 674                 use_editor = 0;
 675         if (edit_flag)
 676                 use_editor = 1;
 677         if (!use_editor)
 678                 setenv("GIT_EDITOR", ":", 1);
 679
 680         if (get_sha1("HEAD", head_sha1))
 681                 initial_commit = 1;
 682
 683         if (!get_sha1("MERGE_HEAD", merge_head_sha1))
 684                 in_merge = 1;
 685
 686         /* Sanity check options */
 687         if (amend && initial_commit)
 688                 die("You have nothing to amend.");
 689         if (amend && in_merge)
 690                 die("You are in the middle of a merge -- cannot amend.");
 691
 692         if (use_message)
 693                 f++;
 694         if (edit_message)
 695                 f++;
 696         if (logfile)
 697                 f++;
 698         if (f > 1)
 699                 die("Only one of -c/-C/-F can be used.");
 700         if (message.len && f > 0)
 701                 die("Option -m cannot be combined with -c/-C/-F.");
 702         if (edit_message)
 703                 use_message = edit_message;
 704         if (amend && !use_message)
 705                 use_message = "HEAD";
 706         if (use_message) {
 707                 unsigned char sha1[20];
 708                 static char utf8[] = "UTF-8";
 709                 const char *out_enc;
 710                 char *enc, *end;
 711                 struct commit *commit;
 712
 713                 if (get_sha1(use_message, sha1))
 714                         die("could not lookup commit %s", use_message);
 715                 commit = lookup_commit_reference(sha1);
 716                 if (!commit || parse_commit(commit))
 717                         die("could not parse commit %s", use_message);
 718
 719                 enc = strstr(commit->buffer, "\nencoding");
 720                 if (enc) {
 721                         end = strchr(enc + 10, '\n');
 722                         enc = xstrndup(enc + 10, end - (enc + 10));
 723                 } else {
 724                         enc = utf8;
 725                 }
 726                 out_enc = git_commit_encoding ? git_commit_encoding : utf8;
 727
 728                 if (strcmp(out_enc, enc))
 729                         use_message_buffer =
 730                                 reencode_string(commit->buffer, out_enc, enc);
 731
 732                 /*
 733                  * If we failed to reencode the buffer, just copy it
 734                  * byte for byte so the user can try to fix it up.
 735                  * This also handles the case where input and output
 736                  * encodings are identical.
 737                  */
 738                 if (use_message_buffer == NULL)
 739                         use_message_buffer = xstrdup(commit->buffer);
 740                 if (enc != utf8)
 741                         free(enc);
 742         }
 743
 744         if (!!also + !!only + !!all + !!interactive > 1)
 745                 die("Only one of --include/--only/--all/--interactive can be used.");
 746         if (argc == 0 && (also || (only && !amend)))
 747                 die("No paths with --include/--only does not make sense.");
 748         if (argc == 0 && only && amend)
 749                 only_include_assumed = "Clever... amending the last one with dirty index.";
 750         if (argc > 0 && !also && !only)
 751                 only_include_assumed = "Explicit paths specified without -i nor -o; assuming --only paths...";
 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         get_commit_format("format:%h: %s", &rev);
 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 }