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