Code

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