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 #include "unpack-trees.h"
  25
  26 static const char * const builtin_commit_usage[] = {
  27         "git-commit [options] [--] <filepattern>...",
  28         NULL
  29 };
  30
  31 static const char * const builtin_status_usage[] = {
  32         "git-status [options] [--] <filepattern>...",
  33         NULL
  34 };
  35
  36 static unsigned char head_sha1[20], merge_head_sha1[20];
  37 static char *use_message_buffer;
  38 static const char commit_editmsg[] = "COMMIT_EDITMSG";
  39 static struct lock_file index_lock; /* real index */
  40 static struct lock_file false_lock; /* used only for partial commits */
  41 static enum {
  42         COMMIT_AS_IS = 1,
  43         COMMIT_NORMAL,
  44         COMMIT_PARTIAL,
  45 } commit_style;
  46
  47 static char *logfile, *force_author, *template_file;
  48 static char *edit_message, *use_message;
  49 static int all, edit_flag, also, interactive, only, amend, signoff;
  50 static int quiet, verbose, untracked_files, no_verify, allow_empty;
  51 /*
  52  * The default commit message cleanup mode will remove the lines
  53  * beginning with # (shell comments) and leading and trailing
  54  * whitespaces (empty lines or containing only whitespaces)
  55  * if editor is used, and only the whitespaces if the message
  56  * is specified explicitly.
  57  */
  58 static enum {
  59         CLEANUP_SPACE,
  60         CLEANUP_NONE,
  61         CLEANUP_ALL,
  62 } cleanup_mode;
  63 static char *cleanup_arg;
  64
  65 static int use_editor = 1, initial_commit, in_merge;
  66 const char *only_include_assumed;
  67 struct strbuf message;
  68
  69 static int opt_parse_m(const struct option *opt, const char *arg, int unset)
  70 {
  71         struct strbuf *buf = opt->value;
  72         if (unset)
  73                 strbuf_setlen(buf, 0);
  74         else {
  75                 strbuf_addstr(buf, arg);
  76                 strbuf_addch(buf, '\n');
  77                 strbuf_addch(buf, '\n');
  78         }
  79         return 0;
  80 }
  81
  82 static struct option builtin_commit_options[] = {
  83         OPT__QUIET(&quiet),
  84         OPT__VERBOSE(&verbose),
  85         OPT_GROUP("Commit message options"),
  86
  87         OPT_STRING('F', "file", &logfile, "FILE", "read log from file"),
  88         OPT_STRING(0, "author", &force_author, "AUTHOR", "override author for commit"),
  89         OPT_CALLBACK('m', "message", &message, "MESSAGE", "specify commit message", opt_parse_m),
  90         OPT_STRING('c', "reedit-message", &edit_message, "COMMIT", "reuse and edit message from specified commit "),
  91         OPT_STRING('C', "reuse-message", &use_message, "COMMIT", "reuse message from specified commit"),
  92         OPT_BOOLEAN('s', "signoff", &signoff, "add Signed-off-by: header"),
  93         OPT_STRING('t', "template", &template_file, "FILE", "use specified template file"),
  94         OPT_BOOLEAN('e', "edit", &edit_flag, "force edit of commit"),
  95
  96         OPT_GROUP("Commit contents options"),
  97         OPT_BOOLEAN('a', "all", &all, "commit all changed files"),
  98         OPT_BOOLEAN('i', "include", &also, "add specified files to index for commit"),
  99         OPT_BOOLEAN(0, "interactive", &interactive, "interactively add files"),
 100         OPT_BOOLEAN('o', "only", &only, ""),
 101         OPT_BOOLEAN('n', "no-verify", &no_verify, "bypass pre-commit hook"),
 102         OPT_BOOLEAN(0, "amend", &amend, "amend previous commit"),
 103         OPT_BOOLEAN(0, "untracked-files", &untracked_files, "show all untracked files"),
 104         OPT_BOOLEAN(0, "allow-empty", &allow_empty, "ok to record an empty change"),
 105         OPT_STRING(0, "cleanup", &cleanup_arg, "default", "how to strip spaces and #comments from message"),
 106
 107         OPT_END()
 108 };
 109
 110 static void rollback_index_files(void)
 111 {
 112         switch (commit_style) {
 113         case COMMIT_AS_IS:
 114                 break; /* nothing to do */
 115         case COMMIT_NORMAL:
 116                 rollback_lock_file(&index_lock);
 117                 break;
 118         case COMMIT_PARTIAL:
 119                 rollback_lock_file(&index_lock);
 120                 rollback_lock_file(&false_lock);
 121                 break;
 122         }
 123 }
 124
 125 static int commit_index_files(void)
 126 {
 127         int err = 0;
 128
 129         switch (commit_style) {
 130         case COMMIT_AS_IS:
 131                 break; /* nothing to do */
 132         case COMMIT_NORMAL:
 133                 err = commit_lock_file(&index_lock);
 134                 break;
 135         case COMMIT_PARTIAL:
 136                 err = commit_lock_file(&index_lock);
 137                 rollback_lock_file(&false_lock);
 138                 break;
 139         }
 140
 141         return err;
 142 }
 143
 144 /*
 145  * Take a union of paths in the index and the named tree (typically, "HEAD"),
 146  * and return the paths that match the given pattern in list.
 147  */
 148 static int list_paths(struct path_list *list, const char *with_tree,
 149                       const char *prefix, const char **pattern)
 150 {
 151         int i;
 152         char *m;
 153
 154         for (i = 0; pattern[i]; i++)
 155                 ;
 156         m = xcalloc(1, i);
 157
 158         if (with_tree)
 159                 overlay_tree_on_cache(with_tree, prefix);
 160
 161         for (i = 0; i < active_nr; i++) {
 162                 struct cache_entry *ce = active_cache[i];
 163                 if (ce->ce_flags & htons(CE_UPDATE))
 164                         continue;
 165                 if (!pathspec_match(pattern, m, ce->name, 0))
 166                         continue;
 167                 path_list_insert(ce->name, list);
 168         }
 169
 170         return report_path_error(m, pattern, prefix ? strlen(prefix) : 0);
 171 }
 172
 173 static void add_remove_files(struct path_list *list)
 174 {
 175         int i;
 176         for (i = 0; i < list->nr; i++) {
 177                 struct path_list_item *p = &(list->items[i]);
 178                 if (file_exists(p->path))
 179                         add_file_to_cache(p->path, 0);
 180                 else
 181                         remove_file_from_cache(p->path);
 182         }
 183 }
 184
 185 static void create_base_index(void)
 186 {
 187         struct tree *tree;
 188         struct unpack_trees_options opts;
 189         struct tree_desc t;
 190
 191         if (initial_commit) {
 192                 discard_cache();
 193                 return;
 194         }
 195
 196         memset(&opts, 0, sizeof(opts));
 197         opts.head_idx = 1;
 198         opts.index_only = 1;
 199         opts.merge = 1;
 200
 201         opts.fn = oneway_merge;
 202         tree = parse_tree_indirect(head_sha1);
 203         if (!tree)
 204                 die("failed to unpack HEAD tree object");
 205         parse_tree(tree);
 206         init_tree_desc(&t, tree->buffer, tree->size);
 207         unpack_trees(1, &t, &opts);
 208 }
 209
 210 static char *prepare_index(int argc, const char **argv, const char *prefix)
 211 {
 212         int fd;
 213         struct path_list partial;
 214         const char **pathspec = NULL;
 215
 216         if (interactive) {
 217                 interactive_add(argc, argv, prefix);
 218                 commit_style = COMMIT_AS_IS;
 219                 return get_index_file();
 220         }
 221
 222         if (read_cache() < 0)
 223                 die("index file corrupt");
 224
 225         if (*argv)
 226                 pathspec = get_pathspec(prefix, argv);
 227
 228         /*
 229          * Non partial, non as-is commit.
 230          *
 231          * (1) get the real index;
 232          * (2) update the_index as necessary;
 233          * (3) write the_index out to the real index (still locked);
 234          * (4) return the name of the locked index file.
 235          *
 236          * The caller should run hooks on the locked real index, and
 237          * (A) if all goes well, commit the real index;
 238          * (B) on failure, rollback the real index.
 239          */
 240         if (all || (also && pathspec && *pathspec)) {
 241                 int fd = hold_locked_index(&index_lock, 1);
 242                 add_files_to_cache(0, also ? prefix : NULL, pathspec);
 243                 refresh_cache(REFRESH_QUIET);
 244                 if (write_cache(fd, active_cache, active_nr) ||
 245                     close_lock_file(&index_lock))
 246                         die("unable to write new_index file");
 247                 commit_style = COMMIT_NORMAL;
 248                 return index_lock.filename;
 249         }
 250
 251         /*
 252          * As-is commit.
 253          *
 254          * (1) return the name of the real index file.
 255          *
 256          * The caller should run hooks on the real index, and run
 257          * hooks on the real index, and create commit from the_index.
 258          * We still need to refresh the index here.
 259          */
 260         if (!pathspec || !*pathspec) {
 261                 fd = hold_locked_index(&index_lock, 1);
 262                 refresh_cache(REFRESH_QUIET);
 263                 if (write_cache(fd, active_cache, active_nr) ||
 264                     commit_locked_index(&index_lock))
 265                         die("unable to write new_index file");
 266                 commit_style = COMMIT_AS_IS;
 267                 return get_index_file();
 268         }
 269
 270         /*
 271          * A partial commit.
 272          *
 273          * (0) find the set of affected paths;
 274          * (1) get lock on the real index file;
 275          * (2) update the_index with the given paths;
 276          * (3) write the_index out to the real index (still locked);
 277          * (4) get lock on the false index file;
 278          * (5) reset the_index from HEAD;
 279          * (6) update the_index the same way as (2);
 280          * (7) write the_index out to the false index file;
 281          * (8) return the name of the false index file (still locked);
 282          *
 283          * The caller should run hooks on the locked false index, and
 284          * create commit from it.  Then
 285          * (A) if all goes well, commit the real index;
 286          * (B) on failure, rollback the real index;
 287          * In either case, rollback the false index.
 288          */
 289         commit_style = COMMIT_PARTIAL;
 290
 291         if (file_exists(git_path("MERGE_HEAD")))
 292                 die("cannot do a partial commit during a merge.");
 293
 294         memset(&partial, 0, sizeof(partial));
 295         partial.strdup_paths = 1;
 296         if (list_paths(&partial, initial_commit ? NULL : "HEAD", prefix, pathspec))
 297                 exit(1);
 298
 299         discard_cache();
 300         if (read_cache() < 0)
 301                 die("cannot read the index");
 302
 303         fd = hold_locked_index(&index_lock, 1);
 304         add_remove_files(&partial);
 305         refresh_cache(REFRESH_QUIET);
 306         if (write_cache(fd, active_cache, active_nr) ||
 307             close_lock_file(&index_lock))
 308                 die("unable to write new_index file");
 309
 310         fd = hold_lock_file_for_update(&false_lock,
 311                                        git_path("next-index-%d", getpid()), 1);
 312
 313         create_base_index();
 314         add_remove_files(&partial);
 315         refresh_cache(REFRESH_QUIET);
 316
 317         if (write_cache(fd, active_cache, active_nr) ||
 318             close_lock_file(&false_lock))
 319                 die("unable to write temporary index file");
 320         return false_lock.filename;
 321 }
 322
 323 static int run_status(FILE *fp, const char *index_file, const char *prefix, int nowarn)
 324 {
 325         struct wt_status s;
 326
 327         wt_status_prepare(&s);
 328         if (wt_status_relative_paths)
 329                 s.prefix = prefix;
 330
 331         if (amend) {
 332                 s.amend = 1;
 333                 s.reference = "HEAD^1";
 334         }
 335         s.verbose = verbose;
 336         s.untracked = untracked_files;
 337         s.index_file = index_file;
 338         s.fp = fp;
 339         s.nowarn = nowarn;
 340
 341         wt_status_print(&s);
 342
 343         return s.commitable;
 344 }
 345
 346 static const char sign_off_header[] = "Signed-off-by: ";
 347
 348 static int prepare_log_message(const char *index_file, const char *prefix)
 349 {
 350         struct stat statbuf;
 351         int commitable, saved_color_setting;
 352         struct strbuf sb;
 353         char *buffer;
 354         FILE *fp;
 355
 356         strbuf_init(&sb, 0);
 357         if (message.len) {
 358                 strbuf_addbuf(&sb, &message);
 359         } else if (logfile && !strcmp(logfile, "-")) {
 360                 if (isatty(0))
 361                         fprintf(stderr, "(reading log message from standard input)\n");
 362                 if (strbuf_read(&sb, 0, 0) < 0)
 363                         die("could not read log from standard input");
 364         } else if (logfile) {
 365                 if (strbuf_read_file(&sb, logfile, 0) < 0)
 366                         die("could not read log file '%s': %s",
 367                             logfile, strerror(errno));
 368         } else if (use_message) {
 369                 buffer = strstr(use_message_buffer, "\n\n");
 370                 if (!buffer || buffer[2] == '\0')
 371                         die("commit has empty message");
 372                 strbuf_add(&sb, buffer + 2, strlen(buffer + 2));
 373         } else if (!stat(git_path("MERGE_MSG"), &statbuf)) {
 374                 if (strbuf_read_file(&sb, git_path("MERGE_MSG"), 0) < 0)
 375                         die("could not read MERGE_MSG: %s", strerror(errno));
 376         } else if (!stat(git_path("SQUASH_MSG"), &statbuf)) {
 377                 if (strbuf_read_file(&sb, git_path("SQUASH_MSG"), 0) < 0)
 378                         die("could not read SQUASH_MSG: %s", strerror(errno));
 379         } else if (template_file && !stat(template_file, &statbuf)) {
 380                 if (strbuf_read_file(&sb, template_file, 0) < 0)
 381                         die("could not read %s: %s",
 382                             template_file, strerror(errno));
 383         }
 384
 385         fp = fopen(git_path(commit_editmsg), "w");
 386         if (fp == NULL)
 387                 die("could not open %s", git_path(commit_editmsg));
 388
 389         if (cleanup_mode != CLEANUP_NONE)
 390                 stripspace(&sb, 0);
 391
 392         if (signoff) {
 393                 struct strbuf sob;
 394                 int i;
 395
 396                 strbuf_init(&sob, 0);
 397                 strbuf_addstr(&sob, sign_off_header);
 398                 strbuf_addstr(&sob, fmt_name(getenv("GIT_COMMITTER_NAME"),
 399                                              getenv("GIT_COMMITTER_EMAIL")));
 400                 strbuf_addch(&sob, '\n');
 401                 for (i = sb.len - 1; i > 0 && sb.buf[i - 1] != '\n'; i--)
 402                         ; /* do nothing */
 403                 if (prefixcmp(sb.buf + i, sob.buf)) {
 404                         if (prefixcmp(sb.buf + i, sign_off_header))
 405                                 strbuf_addch(&sb, '\n');
 406                         strbuf_addbuf(&sb, &sob);
 407                 }
 408                 strbuf_release(&sob);
 409         }
 410
 411         if (fwrite(sb.buf, 1, sb.len, fp) < sb.len)
 412                 die("could not write commit template: %s", strerror(errno));
 413
 414         strbuf_release(&sb);
 415
 416         if (!use_editor) {
 417                 struct rev_info rev;
 418                 unsigned char sha1[20];
 419                 const char *parent = "HEAD";
 420
 421                 fclose(fp);
 422
 423                 if (!active_nr && read_cache() < 0)
 424                         die("Cannot read index");
 425
 426                 if (amend)
 427                         parent = "HEAD^1";
 428
 429                 if (get_sha1(parent, sha1))
 430                         return !!active_nr;
 431
 432                 init_revisions(&rev, "");
 433                 rev.abbrev = 0;
 434                 setup_revisions(0, NULL, &rev, parent);
 435                 DIFF_OPT_SET(&rev.diffopt, QUIET);
 436                 DIFF_OPT_SET(&rev.diffopt, EXIT_WITH_STATUS);
 437                 run_diff_index(&rev, 1 /* cached */);
 438
 439                 return !!DIFF_OPT_TST(&rev.diffopt, HAS_CHANGES);
 440         }
 441
 442         if (in_merge)
 443                 fprintf(fp,
 444                         "#\n"
 445                         "# It looks like you may be committing a MERGE.\n"
 446                         "# If this is not correct, please remove the file\n"
 447                         "#      %s\n"
 448                         "# and try again.\n"
 449                         "#\n",
 450                         git_path("MERGE_HEAD"));
 451
 452         fprintf(fp,
 453                 "\n"
 454                 "# Please enter the commit message for your changes.\n"
 455                 "# (Comment lines starting with '#' will ");
 456         if (cleanup_mode == CLEANUP_ALL)
 457                 fprintf(fp, "not be included)\n");
 458         else /* CLEANUP_SPACE, that is. */
 459                 fprintf(fp, "be kept.\n"
 460                         "# You can remove them yourself if you want to)\n");
 461         if (only_include_assumed)
 462                 fprintf(fp, "# %s\n", only_include_assumed);
 463
 464         saved_color_setting = wt_status_use_color;
 465         wt_status_use_color = 0;
 466         commitable = run_status(fp, index_file, prefix, 1);
 467         wt_status_use_color = saved_color_setting;
 468
 469         fclose(fp);
 470
 471         return commitable;
 472 }
 473
 474 /*
 475  * Find out if the message starting at position 'start' in the strbuf
 476  * contains only whitespace and Signed-off-by lines.
 477  */
 478 static int message_is_empty(struct strbuf *sb, int start)
 479 {
 480         struct strbuf tmpl;
 481         const char *nl;
 482         int eol, i;
 483
 484         if (cleanup_mode == CLEANUP_NONE && sb->len)
 485                 return 0;
 486
 487         /* See if the template is just a prefix of the message. */
 488         strbuf_init(&tmpl, 0);
 489         if (template_file && strbuf_read_file(&tmpl, template_file, 0) > 0) {
 490                 stripspace(&tmpl, cleanup_mode == CLEANUP_ALL);
 491                 if (start + tmpl.len <= sb->len &&
 492                     memcmp(tmpl.buf, sb->buf + start, tmpl.len) == 0)
 493                         start += tmpl.len;
 494         }
 495         strbuf_release(&tmpl);
 496
 497         /* Check if the rest is just whitespace and Signed-of-by's. */
 498         for (i = start; i < sb->len; i++) {
 499                 nl = memchr(sb->buf + i, '\n', sb->len - i);
 500                 if (nl)
 501                         eol = nl - sb->buf;
 502                 else
 503                         eol = sb->len;
 504
 505                 if (strlen(sign_off_header) <= eol - i &&
 506                     !prefixcmp(sb->buf + i, sign_off_header)) {
 507                         i = eol;
 508                         continue;
 509                 }
 510                 while (i < eol)
 511                         if (!isspace(sb->buf[i++]))
 512                                 return 0;
 513         }
 514
 515         return 1;
 516 }
 517
 518 static void determine_author_info(struct strbuf *sb)
 519 {
 520         char *name, *email, *date;
 521
 522         name = getenv("GIT_AUTHOR_NAME");
 523         email = getenv("GIT_AUTHOR_EMAIL");
 524         date = getenv("GIT_AUTHOR_DATE");
 525
 526         if (use_message) {
 527                 const char *a, *lb, *rb, *eol;
 528
 529                 a = strstr(use_message_buffer, "\nauthor ");
 530                 if (!a)
 531                         die("invalid commit: %s", use_message);
 532
 533                 lb = strstr(a + 8, " <");
 534                 rb = strstr(a + 8, "> ");
 535                 eol = strchr(a + 8, '\n');
 536                 if (!lb || !rb || !eol)
 537                         die("invalid commit: %s", use_message);
 538
 539                 name = xstrndup(a + 8, lb - (a + 8));
 540                 email = xstrndup(lb + 2, rb - (lb + 2));
 541                 date = xstrndup(rb + 2, eol - (rb + 2));
 542         }
 543
 544         if (force_author) {
 545                 const char *lb = strstr(force_author, " <");
 546                 const char *rb = strchr(force_author, '>');
 547
 548                 if (!lb || !rb)
 549                         die("malformed --author parameter");
 550                 name = xstrndup(force_author, lb - force_author);
 551                 email = xstrndup(lb + 2, rb - (lb + 2));
 552         }
 553
 554         strbuf_addf(sb, "author %s\n", fmt_ident(name, email, date, IDENT_ERROR_ON_NO_NAME));
 555 }
 556
 557 static int parse_and_validate_options(int argc, const char *argv[],
 558                                       const char * const usage[])
 559 {
 560         int f = 0;
 561
 562         argc = parse_options(argc, argv, builtin_commit_options, usage, 0);
 563
 564         if (logfile || message.len || use_message)
 565                 use_editor = 0;
 566         if (edit_flag)
 567                 use_editor = 1;
 568
 569         if (get_sha1("HEAD", head_sha1))
 570                 initial_commit = 1;
 571
 572         if (!get_sha1("MERGE_HEAD", merge_head_sha1))
 573                 in_merge = 1;
 574
 575         /* Sanity check options */
 576         if (amend && initial_commit)
 577                 die("You have nothing to amend.");
 578         if (amend && in_merge)
 579                 die("You are in the middle of a merge -- cannot amend.");
 580
 581         if (use_message)
 582                 f++;
 583         if (edit_message)
 584                 f++;
 585         if (logfile)
 586                 f++;
 587         if (f > 1)
 588                 die("Only one of -c/-C/-F can be used.");
 589         if (message.len && f > 0)
 590                 die("Option -m cannot be combined with -c/-C/-F.");
 591         if (edit_message)
 592                 use_message = edit_message;
 593         if (amend && !use_message)
 594                 use_message = "HEAD";
 595         if (use_message) {
 596                 unsigned char sha1[20];
 597                 static char utf8[] = "UTF-8";
 598                 const char *out_enc;
 599                 char *enc, *end;
 600                 struct commit *commit;
 601
 602                 if (get_sha1(use_message, sha1))
 603                         die("could not lookup commit %s", use_message);
 604                 commit = lookup_commit(sha1);
 605                 if (!commit || parse_commit(commit))
 606                         die("could not parse commit %s", use_message);
 607
 608                 enc = strstr(commit->buffer, "\nencoding");
 609                 if (enc) {
 610                         end = strchr(enc + 10, '\n');
 611                         enc = xstrndup(enc + 10, end - (enc + 10));
 612                 } else {
 613                         enc = utf8;
 614                 }
 615                 out_enc = git_commit_encoding ? git_commit_encoding : utf8;
 616
 617                 if (strcmp(out_enc, enc))
 618                         use_message_buffer =
 619                                 reencode_string(commit->buffer, out_enc, enc);
 620
 621                 /*
 622                  * If we failed to reencode the buffer, just copy it
 623                  * byte for byte so the user can try to fix it up.
 624                  * This also handles the case where input and output
 625                  * encodings are identical.
 626                  */
 627                 if (use_message_buffer == NULL)
 628                         use_message_buffer = xstrdup(commit->buffer);
 629                 if (enc != utf8)
 630                         free(enc);
 631         }
 632
 633         if (!!also + !!only + !!all + !!interactive > 1)
 634                 die("Only one of --include/--only/--all/--interactive can be used.");
 635         if (argc == 0 && (also || (only && !amend)))
 636                 die("No paths with --include/--only does not make sense.");
 637         if (argc == 0 && only && amend)
 638                 only_include_assumed = "Clever... amending the last one with dirty index.";
 639         if (argc > 0 && !also && !only) {
 640                 only_include_assumed = "Explicit paths specified without -i nor -o; assuming --only paths...";
 641                 also = 0;
 642         }
 643         if (!cleanup_arg || !strcmp(cleanup_arg, "default"))
 644                 cleanup_mode = use_editor ? CLEANUP_ALL : CLEANUP_SPACE;
 645         else if (!strcmp(cleanup_arg, "verbatim"))
 646                 cleanup_mode = CLEANUP_NONE;
 647         else if (!strcmp(cleanup_arg, "whitespace"))
 648                 cleanup_mode = CLEANUP_SPACE;
 649         else if (!strcmp(cleanup_arg, "strip"))
 650                 cleanup_mode = CLEANUP_ALL;
 651         else
 652                 die("Invalid cleanup mode %s", cleanup_arg);
 653
 654         if (all && argc > 0)
 655                 die("Paths with -a does not make sense.");
 656         else if (interactive && argc > 0)
 657                 die("Paths with --interactive does not make sense.");
 658
 659         return argc;
 660 }
 661
 662 int cmd_status(int argc, const char **argv, const char *prefix)
 663 {
 664         const char *index_file;
 665         int commitable;
 666
 667         git_config(git_status_config);
 668
 669         argc = parse_and_validate_options(argc, argv, builtin_status_usage);
 670
 671         index_file = prepare_index(argc, argv, prefix);
 672
 673         commitable = run_status(stdout, index_file, prefix, 0);
 674
 675         rollback_index_files();
 676
 677         return commitable ? 0 : 1;
 678 }
 679
 680 static int run_hook(const char *index_file, const char *name, const char *arg)
 681 {
 682         struct child_process hook;
 683         const char *argv[3], *env[2];
 684         char index[PATH_MAX];
 685
 686         argv[0] = git_path("hooks/%s", name);
 687         argv[1] = arg;
 688         argv[2] = NULL;
 689         snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file);
 690         env[0] = index;
 691         env[1] = NULL;
 692
 693         if (access(argv[0], X_OK) < 0)
 694                 return 0;
 695
 696         memset(&hook, 0, sizeof(hook));
 697         hook.argv = argv;
 698         hook.no_stdin = 1;
 699         hook.stdout_to_stderr = 1;
 700         hook.env = env;
 701
 702         return run_command(&hook);
 703 }
 704
 705 static void print_summary(const char *prefix, const unsigned char *sha1)
 706 {
 707         struct rev_info rev;
 708         struct commit *commit;
 709
 710         commit = lookup_commit(sha1);
 711         if (!commit)
 712                 die("couldn't look up newly created commit");
 713         if (!commit || parse_commit(commit))
 714                 die("could not parse newly created commit");
 715
 716         init_revisions(&rev, prefix);
 717         setup_revisions(0, NULL, &rev, NULL);
 718
 719         rev.abbrev = 0;
 720         rev.diff = 1;
 721         rev.diffopt.output_format =
 722                 DIFF_FORMAT_SHORTSTAT | DIFF_FORMAT_SUMMARY;
 723
 724         rev.verbose_header = 1;
 725         rev.show_root_diff = 1;
 726         rev.commit_format = get_commit_format("format:%h: %s");
 727         rev.always_show_header = 0;
 728         rev.diffopt.detect_rename = 1;
 729         rev.diffopt.rename_limit = 100;
 730         rev.diffopt.break_opt = 0;
 731         diff_setup_done(&rev.diffopt);
 732
 733         printf("Created %scommit ", initial_commit ? "initial " : "");
 734
 735         if (!log_tree_commit(&rev, commit)) {
 736                 struct strbuf buf = STRBUF_INIT;
 737                 format_commit_message(commit, "%h: %s", &buf);
 738                 printf("%s\n", buf.buf);
 739                 strbuf_release(&buf);
 740         }
 741 }
 742
 743 int git_commit_config(const char *k, const char *v)
 744 {
 745         if (!strcmp(k, "commit.template")) {
 746                 template_file = xstrdup(v);
 747                 return 0;
 748         }
 749
 750         return git_status_config(k, v);
 751 }
 752
 753 static int is_a_merge(const unsigned char *sha1)
 754 {
 755         struct commit *commit = lookup_commit(sha1);
 756         if (!commit || parse_commit(commit))
 757                 die("could not parse HEAD commit");
 758         return !!(commit->parents && commit->parents->next);
 759 }
 760
 761 static const char commit_utf8_warn[] =
 762 "Warning: commit message does not conform to UTF-8.\n"
 763 "You may want to amend it after fixing the message, or set the config\n"
 764 "variable i18n.commitencoding to the encoding your project uses.\n";
 765
 766 static void add_parent(struct strbuf *sb, const unsigned char *sha1)
 767 {
 768         struct object *obj = parse_object(sha1);
 769         const char *parent = sha1_to_hex(sha1);
 770         if (!obj)
 771                 die("Unable to find commit parent %s", parent);
 772         if (obj->type != OBJ_COMMIT)
 773                 die("Parent %s isn't a proper commit", parent);
 774         strbuf_addf(sb, "parent %s\n", parent);
 775 }
 776
 777 int cmd_commit(int argc, const char **argv, const char *prefix)
 778 {
 779         int header_len;
 780         struct strbuf sb;
 781         const char *index_file, *reflog_msg;
 782         char *nl, *p;
 783         unsigned char commit_sha1[20];
 784         struct ref_lock *ref_lock;
 785
 786         git_config(git_commit_config);
 787
 788         argc = parse_and_validate_options(argc, argv, builtin_commit_usage);
 789
 790         index_file = prepare_index(argc, argv, prefix);
 791
 792         if (!no_verify && run_hook(index_file, "pre-commit", NULL)) {
 793                 rollback_index_files();
 794                 return 1;
 795         }
 796
 797         if (!prepare_log_message(index_file, prefix) && !in_merge &&
 798             !allow_empty && !(amend && is_a_merge(head_sha1))) {
 799                 run_status(stdout, index_file, prefix, 0);
 800                 rollback_index_files();
 801                 unlink(commit_editmsg);
 802                 return 1;
 803         }
 804
 805         /*
 806          * Re-read the index as pre-commit hook could have updated it,
 807          * and write it out as a tree.
 808          */
 809         discard_cache();
 810         read_cache_from(index_file);
 811         if (!active_cache_tree)
 812                 active_cache_tree = cache_tree();
 813         if (cache_tree_update(active_cache_tree,
 814                               active_cache, active_nr, 0, 0) < 0) {
 815                 rollback_index_files();
 816                 die("Error building trees");
 817         }
 818
 819         /*
 820          * The commit object
 821          */
 822         strbuf_init(&sb, 0);
 823         strbuf_addf(&sb, "tree %s\n",
 824                     sha1_to_hex(active_cache_tree->sha1));
 825
 826         /* Determine parents */
 827         if (initial_commit) {
 828                 reflog_msg = "commit (initial)";
 829         } else if (amend) {
 830                 struct commit_list *c;
 831                 struct commit *commit;
 832
 833                 reflog_msg = "commit (amend)";
 834                 commit = lookup_commit(head_sha1);
 835                 if (!commit || parse_commit(commit))
 836                         die("could not parse HEAD commit");
 837
 838                 for (c = commit->parents; c; c = c->next)
 839                         add_parent(&sb, c->item->object.sha1);
 840         } else if (in_merge) {
 841                 struct strbuf m;
 842                 FILE *fp;
 843
 844                 reflog_msg = "commit (merge)";
 845                 add_parent(&sb, head_sha1);
 846                 strbuf_init(&m, 0);
 847                 fp = fopen(git_path("MERGE_HEAD"), "r");
 848                 if (fp == NULL)
 849                         die("could not open %s for reading: %s",
 850                             git_path("MERGE_HEAD"), strerror(errno));
 851                 while (strbuf_getline(&m, fp, '\n') != EOF) {
 852                         unsigned char sha1[20];
 853                         if (get_sha1_hex(m.buf, sha1) < 0)
 854                                 die("Corrupt MERGE_HEAD file (%s)", m.buf);
 855                         add_parent(&sb, sha1);
 856                 }
 857                 fclose(fp);
 858                 strbuf_release(&m);
 859         } else {
 860                 reflog_msg = "commit";
 861                 strbuf_addf(&sb, "parent %s\n", sha1_to_hex(head_sha1));
 862         }
 863
 864         determine_author_info(&sb);
 865         strbuf_addf(&sb, "committer %s\n", git_committer_info(IDENT_ERROR_ON_NO_NAME));
 866         if (!is_encoding_utf8(git_commit_encoding))
 867                 strbuf_addf(&sb, "encoding %s\n", git_commit_encoding);
 868         strbuf_addch(&sb, '\n');
 869
 870         /* Get the commit message and validate it */
 871         header_len = sb.len;
 872         if (use_editor) {
 873                 char index[PATH_MAX];
 874                 const char *env[2] = { index, NULL };
 875                 snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file);
 876                 launch_editor(git_path(commit_editmsg), NULL, env);
 877         }
 878         if (!no_verify &&
 879             run_hook(index_file, "commit-msg", git_path(commit_editmsg))) {
 880                 rollback_index_files();
 881                 exit(1);
 882         }
 883         if (strbuf_read_file(&sb, git_path(commit_editmsg), 0) < 0) {
 884                 rollback_index_files();
 885                 die("could not read commit message");
 886         }
 887
 888         /* Truncate the message just before the diff, if any. */
 889         p = strstr(sb.buf, "\ndiff --git a/");
 890         if (p != NULL)
 891                 strbuf_setlen(&sb, p - sb.buf + 1);
 892
 893         if (cleanup_mode != CLEANUP_NONE)
 894                 stripspace(&sb, cleanup_mode == CLEANUP_ALL);
 895         if (sb.len < header_len || message_is_empty(&sb, header_len)) {
 896                 rollback_index_files();
 897                 die("no commit message?  aborting commit.");
 898         }
 899         strbuf_addch(&sb, '\0');
 900         if (is_encoding_utf8(git_commit_encoding) && !is_utf8(sb.buf))
 901                 fprintf(stderr, commit_utf8_warn);
 902
 903         if (write_sha1_file(sb.buf, sb.len - 1, commit_type, commit_sha1)) {
 904                 rollback_index_files();
 905                 die("failed to write commit object");
 906         }
 907
 908         ref_lock = lock_any_ref_for_update("HEAD",
 909                                            initial_commit ? NULL : head_sha1,
 910                                            0);
 911
 912         nl = strchr(sb.buf + header_len, '\n');
 913         if (nl)
 914                 strbuf_setlen(&sb, nl + 1 - sb.buf);
 915         else
 916                 strbuf_addch(&sb, '\n');
 917         strbuf_remove(&sb, 0, header_len);
 918         strbuf_insert(&sb, 0, reflog_msg, strlen(reflog_msg));
 919         strbuf_insert(&sb, strlen(reflog_msg), ": ", 2);
 920
 921         if (!ref_lock) {
 922                 rollback_index_files();
 923                 die("cannot lock HEAD ref");
 924         }
 925         if (write_ref_sha1(ref_lock, commit_sha1, sb.buf) < 0) {
 926                 rollback_index_files();
 927                 die("cannot update HEAD ref");
 928         }
 929
 930         unlink(git_path("MERGE_HEAD"));
 931         unlink(git_path("MERGE_MSG"));
 932
 933         if (commit_index_files())
 934                 die ("Repository has been updated, but unable to write\n"
 935                      "new_index file. Check that disk is not full or quota is\n"
 936                      "not exceeded, and then \"git reset HEAD\" to recover.");
 937
 938         rerere();
 939         run_hook(get_index_file(), "post-commit", NULL);
 940         if (!quiet)
 941                 print_summary(prefix, commit_sha1);
 942
 943         return 0;
 944 }