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