builtin / commit.con commit Merge branch 'jk/argv-array' into maint (60f60b4)
   1/*
   2 * Builtin "git commit"
   3 *
   4 * Copyright (c) 2007 Kristian Høgsberg <krh@redhat.com>
   5 * Based on git-commit.sh by Junio C Hamano and Linus Torvalds
   6 */
   7
   8#include "cache.h"
   9#include "cache-tree.h"
  10#include "color.h"
  11#include "dir.h"
  12#include "builtin.h"
  13#include "diff.h"
  14#include "diffcore.h"
  15#include "commit.h"
  16#include "revision.h"
  17#include "wt-status.h"
  18#include "run-command.h"
  19#include "refs.h"
  20#include "log-tree.h"
  21#include "strbuf.h"
  22#include "utf8.h"
  23#include "parse-options.h"
  24#include "string-list.h"
  25#include "rerere.h"
  26#include "unpack-trees.h"
  27#include "quote.h"
  28#include "submodule.h"
  29
  30static const char * const builtin_commit_usage[] = {
  31        "git commit [options] [--] <filepattern>...",
  32        NULL
  33};
  34
  35static const char * const builtin_status_usage[] = {
  36        "git status [options] [--] <filepattern>...",
  37        NULL
  38};
  39
  40static const char implicit_ident_advice[] =
  41N_("Your name and email address were configured automatically based\n"
  42"on your username and hostname. Please check that they are accurate.\n"
  43"You can suppress this message by setting them explicitly:\n"
  44"\n"
  45"    git config --global user.name \"Your Name\"\n"
  46"    git config --global user.email you@example.com\n"
  47"\n"
  48"After doing this, you may fix the identity used for this commit with:\n"
  49"\n"
  50"    git commit --amend --reset-author\n");
  51
  52static const char empty_amend_advice[] =
  53N_("You asked to amend the most recent commit, but doing so would make\n"
  54"it empty. You can repeat your command with --allow-empty, or you can\n"
  55"remove the commit entirely with \"git reset HEAD^\".\n");
  56
  57static const char empty_cherry_pick_advice[] =
  58N_("The previous cherry-pick is now empty, possibly due to conflict resolution.\n"
  59"If you wish to commit it anyway, use:\n"
  60"\n"
  61"    git commit --allow-empty\n"
  62"\n"
  63"Otherwise, please use 'git reset'\n");
  64
  65static const char *use_message_buffer;
  66static const char commit_editmsg[] = "COMMIT_EDITMSG";
  67static struct lock_file index_lock; /* real index */
  68static struct lock_file false_lock; /* used only for partial commits */
  69static enum {
  70        COMMIT_AS_IS = 1,
  71        COMMIT_NORMAL,
  72        COMMIT_PARTIAL
  73} commit_style;
  74
  75static const char *logfile, *force_author;
  76static const char *template_file;
  77/*
  78 * The _message variables are commit names from which to take
  79 * the commit message and/or authorship.
  80 */
  81static const char *author_message, *author_message_buffer;
  82static char *edit_message, *use_message;
  83static char *fixup_message, *squash_message;
  84static int all, edit_flag, also, interactive, patch_interactive, only, amend, signoff;
  85static int quiet, verbose, no_verify, allow_empty, dry_run, renew_authorship;
  86static int no_post_rewrite, allow_empty_message;
  87static char *untracked_files_arg, *force_date, *ignore_submodule_arg;
  88/*
  89 * The default commit message cleanup mode will remove the lines
  90 * beginning with # (shell comments) and leading and trailing
  91 * whitespaces (empty lines or containing only whitespaces)
  92 * if editor is used, and only the whitespaces if the message
  93 * is specified explicitly.
  94 */
  95static enum {
  96        CLEANUP_SPACE,
  97        CLEANUP_NONE,
  98        CLEANUP_ALL
  99} cleanup_mode;
 100static char *cleanup_arg;
 101
 102static enum commit_whence whence;
 103static int use_editor = 1, include_status = 1;
 104static int show_ignored_in_status;
 105static const char *only_include_assumed;
 106static struct strbuf message;
 107
 108static int null_termination;
 109static enum {
 110        STATUS_FORMAT_LONG,
 111        STATUS_FORMAT_SHORT,
 112        STATUS_FORMAT_PORCELAIN
 113} status_format = STATUS_FORMAT_LONG;
 114static int status_show_branch;
 115
 116static int opt_parse_m(const struct option *opt, const char *arg, int unset)
 117{
 118        struct strbuf *buf = opt->value;
 119        if (unset)
 120                strbuf_setlen(buf, 0);
 121        else {
 122                strbuf_addstr(buf, arg);
 123                strbuf_addstr(buf, "\n\n");
 124        }
 125        return 0;
 126}
 127
 128static struct option builtin_commit_options[] = {
 129        OPT__QUIET(&quiet, "suppress summary after successful commit"),
 130        OPT__VERBOSE(&verbose, "show diff in commit message template"),
 131
 132        OPT_GROUP("Commit message options"),
 133        OPT_FILENAME('F', "file", &logfile, "read message from file"),
 134        OPT_STRING(0, "author", &force_author, "author", "override author for commit"),
 135        OPT_STRING(0, "date", &force_date, "date", "override date for commit"),
 136        OPT_CALLBACK('m', "message", &message, "message", "commit message", opt_parse_m),
 137        OPT_STRING('c', "reedit-message", &edit_message, "commit", "reuse and edit message from specified commit"),
 138        OPT_STRING('C', "reuse-message", &use_message, "commit", "reuse message from specified commit"),
 139        OPT_STRING(0, "fixup", &fixup_message, "commit", "use autosquash formatted message to fixup specified commit"),
 140        OPT_STRING(0, "squash", &squash_message, "commit", "use autosquash formatted message to squash specified commit"),
 141        OPT_BOOLEAN(0, "reset-author", &renew_authorship, "the commit is authored by me now (used with -C-c/--amend)"),
 142        OPT_BOOLEAN('s', "signoff", &signoff, "add Signed-off-by:"),
 143        OPT_FILENAME('t', "template", &template_file, "use specified template file"),
 144        OPT_BOOLEAN('e', "edit", &edit_flag, "force edit of commit"),
 145        OPT_STRING(0, "cleanup", &cleanup_arg, "default", "how to strip spaces and #comments from message"),
 146        OPT_BOOLEAN(0, "status", &include_status, "include status in commit message template"),
 147        /* end commit message options */
 148
 149        OPT_GROUP("Commit contents options"),
 150        OPT_BOOLEAN('a', "all", &all, "commit all changed files"),
 151        OPT_BOOLEAN('i', "include", &also, "add specified files to index for commit"),
 152        OPT_BOOLEAN(0, "interactive", &interactive, "interactively add files"),
 153        OPT_BOOLEAN('p', "patch", &patch_interactive, "interactively add changes"),
 154        OPT_BOOLEAN('o', "only", &only, "commit only specified files"),
 155        OPT_BOOLEAN('n', "no-verify", &no_verify, "bypass pre-commit hook"),
 156        OPT_BOOLEAN(0, "dry-run", &dry_run, "show what would be committed"),
 157        OPT_SET_INT(0, "short", &status_format, "show status concisely",
 158                    STATUS_FORMAT_SHORT),
 159        OPT_BOOLEAN(0, "branch", &status_show_branch, "show branch information"),
 160        OPT_SET_INT(0, "porcelain", &status_format,
 161                    "machine-readable output", STATUS_FORMAT_PORCELAIN),
 162        OPT_BOOLEAN('z', "null", &null_termination,
 163                    "terminate entries with NUL"),
 164        OPT_BOOLEAN(0, "amend", &amend, "amend previous commit"),
 165        OPT_BOOLEAN(0, "no-post-rewrite", &no_post_rewrite, "bypass post-rewrite hook"),
 166        { OPTION_STRING, 'u', "untracked-files", &untracked_files_arg, "mode", "show untracked files, optional modes: all, normal, no. (Default: all)", PARSE_OPT_OPTARG, NULL, (intptr_t)"all" },
 167        /* end commit contents options */
 168
 169        { OPTION_BOOLEAN, 0, "allow-empty", &allow_empty, NULL,
 170          "ok to record an empty change",
 171          PARSE_OPT_NOARG | PARSE_OPT_HIDDEN },
 172        { OPTION_BOOLEAN, 0, "allow-empty-message", &allow_empty_message, NULL,
 173          "ok to record a change with an empty message",
 174          PARSE_OPT_NOARG | PARSE_OPT_HIDDEN },
 175
 176        OPT_END()
 177};
 178
 179static void determine_whence(struct wt_status *s)
 180{
 181        if (file_exists(git_path("MERGE_HEAD")))
 182                whence = FROM_MERGE;
 183        else if (file_exists(git_path("CHERRY_PICK_HEAD")))
 184                whence = FROM_CHERRY_PICK;
 185        else
 186                whence = FROM_COMMIT;
 187        if (s)
 188                s->whence = whence;
 189}
 190
 191static const char *whence_s(void)
 192{
 193        char *s = "";
 194
 195        switch (whence) {
 196        case FROM_COMMIT:
 197                break;
 198        case FROM_MERGE:
 199                s = "merge";
 200                break;
 201        case FROM_CHERRY_PICK:
 202                s = "cherry-pick";
 203                break;
 204        }
 205
 206        return s;
 207}
 208
 209static void rollback_index_files(void)
 210{
 211        switch (commit_style) {
 212        case COMMIT_AS_IS:
 213                break; /* nothing to do */
 214        case COMMIT_NORMAL:
 215                rollback_lock_file(&index_lock);
 216                break;
 217        case COMMIT_PARTIAL:
 218                rollback_lock_file(&index_lock);
 219                rollback_lock_file(&false_lock);
 220                break;
 221        }
 222}
 223
 224static int commit_index_files(void)
 225{
 226        int err = 0;
 227
 228        switch (commit_style) {
 229        case COMMIT_AS_IS:
 230                break; /* nothing to do */
 231        case COMMIT_NORMAL:
 232                err = commit_lock_file(&index_lock);
 233                break;
 234        case COMMIT_PARTIAL:
 235                err = commit_lock_file(&index_lock);
 236                rollback_lock_file(&false_lock);
 237                break;
 238        }
 239
 240        return err;
 241}
 242
 243/*
 244 * Take a union of paths in the index and the named tree (typically, "HEAD"),
 245 * and return the paths that match the given pattern in list.
 246 */
 247static int list_paths(struct string_list *list, const char *with_tree,
 248                      const char *prefix, const char **pattern)
 249{
 250        int i;
 251        char *m;
 252
 253        for (i = 0; pattern[i]; i++)
 254                ;
 255        m = xcalloc(1, i);
 256
 257        if (with_tree) {
 258                const char *max_prefix = pathspec_prefix(prefix, pattern);
 259                overlay_tree_on_cache(with_tree, max_prefix);
 260        }
 261
 262        for (i = 0; i < active_nr; i++) {
 263                struct cache_entry *ce = active_cache[i];
 264                struct string_list_item *item;
 265
 266                if (ce->ce_flags & CE_UPDATE)
 267                        continue;
 268                if (!match_pathspec(pattern, ce->name, ce_namelen(ce), 0, m))
 269                        continue;
 270                item = string_list_insert(list, ce->name);
 271                if (ce_skip_worktree(ce))
 272                        item->util = item; /* better a valid pointer than a fake one */
 273        }
 274
 275        return report_path_error(m, pattern, prefix);
 276}
 277
 278static void add_remove_files(struct string_list *list)
 279{
 280        int i;
 281        for (i = 0; i < list->nr; i++) {
 282                struct stat st;
 283                struct string_list_item *p = &(list->items[i]);
 284
 285                /* p->util is skip-worktree */
 286                if (p->util)
 287                        continue;
 288
 289                if (!lstat(p->string, &st)) {
 290                        if (add_to_cache(p->string, &st, 0))
 291                                die(_("updating files failed"));
 292                } else
 293                        remove_file_from_cache(p->string);
 294        }
 295}
 296
 297static void create_base_index(const struct commit *current_head)
 298{
 299        struct tree *tree;
 300        struct unpack_trees_options opts;
 301        struct tree_desc t;
 302
 303        if (!current_head) {
 304                discard_cache();
 305                return;
 306        }
 307
 308        memset(&opts, 0, sizeof(opts));
 309        opts.head_idx = 1;
 310        opts.index_only = 1;
 311        opts.merge = 1;
 312        opts.src_index = &the_index;
 313        opts.dst_index = &the_index;
 314
 315        opts.fn = oneway_merge;
 316        tree = parse_tree_indirect(current_head->object.sha1);
 317        if (!tree)
 318                die(_("failed to unpack HEAD tree object"));
 319        parse_tree(tree);
 320        init_tree_desc(&t, tree->buffer, tree->size);
 321        if (unpack_trees(1, &t, &opts))
 322                exit(128); /* We've already reported the error, finish dying */
 323}
 324
 325static void refresh_cache_or_die(int refresh_flags)
 326{
 327        /*
 328         * refresh_flags contains REFRESH_QUIET, so the only errors
 329         * are for unmerged entries.
 330         */
 331        if (refresh_cache(refresh_flags | REFRESH_IN_PORCELAIN))
 332                die_resolve_conflict("commit");
 333}
 334
 335static char *prepare_index(int argc, const char **argv, const char *prefix,
 336                           const struct commit *current_head, int is_status)
 337{
 338        int fd;
 339        struct string_list partial;
 340        const char **pathspec = NULL;
 341        char *old_index_env = NULL;
 342        int refresh_flags = REFRESH_QUIET;
 343
 344        if (is_status)
 345                refresh_flags |= REFRESH_UNMERGED;
 346
 347        if (*argv)
 348                pathspec = get_pathspec(prefix, argv);
 349
 350        if (read_cache_preload(pathspec) < 0)
 351                die(_("index file corrupt"));
 352
 353        if (interactive) {
 354                fd = hold_locked_index(&index_lock, 1);
 355
 356                refresh_cache_or_die(refresh_flags);
 357
 358                if (write_cache(fd, active_cache, active_nr) ||
 359                    close_lock_file(&index_lock))
 360                        die(_("unable to create temporary index"));
 361
 362                old_index_env = getenv(INDEX_ENVIRONMENT);
 363                setenv(INDEX_ENVIRONMENT, index_lock.filename, 1);
 364
 365                if (interactive_add(argc, argv, prefix, patch_interactive) != 0)
 366                        die(_("interactive add failed"));
 367
 368                if (old_index_env && *old_index_env)
 369                        setenv(INDEX_ENVIRONMENT, old_index_env, 1);
 370                else
 371                        unsetenv(INDEX_ENVIRONMENT);
 372
 373                discard_cache();
 374                read_cache_from(index_lock.filename);
 375
 376                commit_style = COMMIT_NORMAL;
 377                return index_lock.filename;
 378        }
 379
 380        /*
 381         * Non partial, non as-is commit.
 382         *
 383         * (1) get the real index;
 384         * (2) update the_index as necessary;
 385         * (3) write the_index out to the real index (still locked);
 386         * (4) return the name of the locked index file.
 387         *
 388         * The caller should run hooks on the locked real index, and
 389         * (A) if all goes well, commit the real index;
 390         * (B) on failure, rollback the real index.
 391         */
 392        if (all || (also && pathspec && *pathspec)) {
 393                fd = hold_locked_index(&index_lock, 1);
 394                add_files_to_cache(also ? prefix : NULL, pathspec, 0);
 395                refresh_cache_or_die(refresh_flags);
 396                if (write_cache(fd, active_cache, active_nr) ||
 397                    close_lock_file(&index_lock))
 398                        die(_("unable to write new_index file"));
 399                commit_style = COMMIT_NORMAL;
 400                return index_lock.filename;
 401        }
 402
 403        /*
 404         * As-is commit.
 405         *
 406         * (1) return the name of the real index file.
 407         *
 408         * The caller should run hooks on the real index,
 409         * and create commit from the_index.
 410         * We still need to refresh the index here.
 411         */
 412        if (!pathspec || !*pathspec) {
 413                fd = hold_locked_index(&index_lock, 1);
 414                refresh_cache_or_die(refresh_flags);
 415                if (active_cache_changed) {
 416                        if (write_cache(fd, active_cache, active_nr) ||
 417                            commit_locked_index(&index_lock))
 418                                die(_("unable to write new_index file"));
 419                } else {
 420                        rollback_lock_file(&index_lock);
 421                }
 422                commit_style = COMMIT_AS_IS;
 423                return get_index_file();
 424        }
 425
 426        /*
 427         * A partial commit.
 428         *
 429         * (0) find the set of affected paths;
 430         * (1) get lock on the real index file;
 431         * (2) update the_index with the given paths;
 432         * (3) write the_index out to the real index (still locked);
 433         * (4) get lock on the false index file;
 434         * (5) reset the_index from HEAD;
 435         * (6) update the_index the same way as (2);
 436         * (7) write the_index out to the false index file;
 437         * (8) return the name of the false index file (still locked);
 438         *
 439         * The caller should run hooks on the locked false index, and
 440         * create commit from it.  Then
 441         * (A) if all goes well, commit the real index;
 442         * (B) on failure, rollback the real index;
 443         * In either case, rollback the false index.
 444         */
 445        commit_style = COMMIT_PARTIAL;
 446
 447        if (whence != FROM_COMMIT)
 448                die(_("cannot do a partial commit during a %s."), whence_s());
 449
 450        memset(&partial, 0, sizeof(partial));
 451        partial.strdup_strings = 1;
 452        if (list_paths(&partial, !current_head ? NULL : "HEAD", prefix, pathspec))
 453                exit(1);
 454
 455        discard_cache();
 456        if (read_cache() < 0)
 457                die(_("cannot read the index"));
 458
 459        fd = hold_locked_index(&index_lock, 1);
 460        add_remove_files(&partial);
 461        refresh_cache(REFRESH_QUIET);
 462        if (write_cache(fd, active_cache, active_nr) ||
 463            close_lock_file(&index_lock))
 464                die(_("unable to write new_index file"));
 465
 466        fd = hold_lock_file_for_update(&false_lock,
 467                                       git_path("next-index-%"PRIuMAX,
 468                                                (uintmax_t) getpid()),
 469                                       LOCK_DIE_ON_ERROR);
 470
 471        create_base_index(current_head);
 472        add_remove_files(&partial);
 473        refresh_cache(REFRESH_QUIET);
 474
 475        if (write_cache(fd, active_cache, active_nr) ||
 476            close_lock_file(&false_lock))
 477                die(_("unable to write temporary index file"));
 478
 479        discard_cache();
 480        read_cache_from(false_lock.filename);
 481
 482        return false_lock.filename;
 483}
 484
 485static int run_status(FILE *fp, const char *index_file, const char *prefix, int nowarn,
 486                      struct wt_status *s)
 487{
 488        unsigned char sha1[20];
 489
 490        if (s->relative_paths)
 491                s->prefix = prefix;
 492
 493        if (amend) {
 494                s->amend = 1;
 495                s->reference = "HEAD^1";
 496        }
 497        s->verbose = verbose;
 498        s->index_file = index_file;
 499        s->fp = fp;
 500        s->nowarn = nowarn;
 501        s->is_initial = get_sha1(s->reference, sha1) ? 1 : 0;
 502
 503        wt_status_collect(s);
 504
 505        switch (status_format) {
 506        case STATUS_FORMAT_SHORT:
 507                wt_shortstatus_print(s, null_termination, status_show_branch);
 508                break;
 509        case STATUS_FORMAT_PORCELAIN:
 510                wt_porcelain_print(s, null_termination);
 511                break;
 512        case STATUS_FORMAT_LONG:
 513                wt_status_print(s);
 514                break;
 515        }
 516
 517        return s->commitable;
 518}
 519
 520static int is_a_merge(const struct commit *current_head)
 521{
 522        return !!(current_head->parents && current_head->parents->next);
 523}
 524
 525static const char sign_off_header[] = "Signed-off-by: ";
 526
 527static void determine_author_info(struct strbuf *author_ident)
 528{
 529        char *name, *email, *date;
 530
 531        name = getenv("GIT_AUTHOR_NAME");
 532        email = getenv("GIT_AUTHOR_EMAIL");
 533        date = getenv("GIT_AUTHOR_DATE");
 534
 535        if (author_message) {
 536                const char *a, *lb, *rb, *eol;
 537
 538                a = strstr(author_message_buffer, "\nauthor ");
 539                if (!a)
 540                        die(_("invalid commit: %s"), author_message);
 541
 542                lb = strchrnul(a + strlen("\nauthor "), '<');
 543                rb = strchrnul(lb, '>');
 544                eol = strchrnul(rb, '\n');
 545                if (!*lb || !*rb || !*eol)
 546                        die(_("invalid commit: %s"), author_message);
 547
 548                if (lb == a + strlen("\nauthor "))
 549                        /* \nauthor <foo@example.com> */
 550                        name = xcalloc(1, 1);
 551                else
 552                        name = xmemdupz(a + strlen("\nauthor "),
 553                                        (lb - strlen(" ") -
 554                                         (a + strlen("\nauthor "))));
 555                email = xmemdupz(lb + strlen("<"), rb - (lb + strlen("<")));
 556                date = xmemdupz(rb + strlen("> "), eol - (rb + strlen("> ")));
 557        }
 558
 559        if (force_author) {
 560                const char *lb = strstr(force_author, " <");
 561                const char *rb = strchr(force_author, '>');
 562
 563                if (!lb || !rb)
 564                        die(_("malformed --author parameter"));
 565                name = xstrndup(force_author, lb - force_author);
 566                email = xstrndup(lb + 2, rb - (lb + 2));
 567        }
 568
 569        if (force_date)
 570                date = force_date;
 571        strbuf_addstr(author_ident, fmt_ident(name, email, date,
 572                                              IDENT_ERROR_ON_NO_NAME));
 573}
 574
 575static int ends_rfc2822_footer(struct strbuf *sb)
 576{
 577        int ch;
 578        int hit = 0;
 579        int i, j, k;
 580        int len = sb->len;
 581        int first = 1;
 582        const char *buf = sb->buf;
 583
 584        for (i = len - 1; i > 0; i--) {
 585                if (hit && buf[i] == '\n')
 586                        break;
 587                hit = (buf[i] == '\n');
 588        }
 589
 590        while (i < len - 1 && buf[i] == '\n')
 591                i++;
 592
 593        for (; i < len; i = k) {
 594                for (k = i; k < len && buf[k] != '\n'; k++)
 595                        ; /* do nothing */
 596                k++;
 597
 598                if ((buf[k] == ' ' || buf[k] == '\t') && !first)
 599                        continue;
 600
 601                first = 0;
 602
 603                for (j = 0; i + j < len; j++) {
 604                        ch = buf[i + j];
 605                        if (ch == ':')
 606                                break;
 607                        if (isalnum(ch) ||
 608                            (ch == '-'))
 609                                continue;
 610                        return 0;
 611                }
 612        }
 613        return 1;
 614}
 615
 616static char *cut_ident_timestamp_part(char *string)
 617{
 618        char *ket = strrchr(string, '>');
 619        if (!ket || ket[1] != ' ')
 620                die(_("Malformed ident string: '%s'"), string);
 621        *++ket = '\0';
 622        return ket;
 623}
 624
 625static int prepare_to_commit(const char *index_file, const char *prefix,
 626                             struct commit *current_head,
 627                             struct wt_status *s,
 628                             struct strbuf *author_ident)
 629{
 630        struct stat statbuf;
 631        struct strbuf committer_ident = STRBUF_INIT;
 632        int commitable, saved_color_setting;
 633        struct strbuf sb = STRBUF_INIT;
 634        char *buffer;
 635        const char *hook_arg1 = NULL;
 636        const char *hook_arg2 = NULL;
 637        int ident_shown = 0;
 638        int clean_message_contents = (cleanup_mode != CLEANUP_NONE);
 639
 640        if (!no_verify && run_hook(index_file, "pre-commit", NULL))
 641                return 0;
 642
 643        if (squash_message) {
 644                /*
 645                 * Insert the proper subject line before other commit
 646                 * message options add their content.
 647                 */
 648                if (use_message && !strcmp(use_message, squash_message))
 649                        strbuf_addstr(&sb, "squash! ");
 650                else {
 651                        struct pretty_print_context ctx = {0};
 652                        struct commit *c;
 653                        c = lookup_commit_reference_by_name(squash_message);
 654                        if (!c)
 655                                die(_("could not lookup commit %s"), squash_message);
 656                        ctx.output_encoding = get_commit_output_encoding();
 657                        format_commit_message(c, "squash! %s\n\n", &sb,
 658                                              &ctx);
 659                }
 660        }
 661
 662        if (message.len) {
 663                strbuf_addbuf(&sb, &message);
 664                hook_arg1 = "message";
 665        } else if (logfile && !strcmp(logfile, "-")) {
 666                if (isatty(0))
 667                        fprintf(stderr, _("(reading log message from standard input)\n"));
 668                if (strbuf_read(&sb, 0, 0) < 0)
 669                        die_errno(_("could not read log from standard input"));
 670                hook_arg1 = "message";
 671        } else if (logfile) {
 672                if (strbuf_read_file(&sb, logfile, 0) < 0)
 673                        die_errno(_("could not read log file '%s'"),
 674                                  logfile);
 675                hook_arg1 = "message";
 676        } else if (use_message) {
 677                buffer = strstr(use_message_buffer, "\n\n");
 678                if (!buffer || buffer[2] == '\0')
 679                        die(_("commit has empty message"));
 680                strbuf_add(&sb, buffer + 2, strlen(buffer + 2));
 681                hook_arg1 = "commit";
 682                hook_arg2 = use_message;
 683        } else if (fixup_message) {
 684                struct pretty_print_context ctx = {0};
 685                struct commit *commit;
 686                commit = lookup_commit_reference_by_name(fixup_message);
 687                if (!commit)
 688                        die(_("could not lookup commit %s"), fixup_message);
 689                ctx.output_encoding = get_commit_output_encoding();
 690                format_commit_message(commit, "fixup! %s\n\n",
 691                                      &sb, &ctx);
 692                hook_arg1 = "message";
 693        } else if (!stat(git_path("MERGE_MSG"), &statbuf)) {
 694                if (strbuf_read_file(&sb, git_path("MERGE_MSG"), 0) < 0)
 695                        die_errno(_("could not read MERGE_MSG"));
 696                hook_arg1 = "merge";
 697        } else if (!stat(git_path("SQUASH_MSG"), &statbuf)) {
 698                if (strbuf_read_file(&sb, git_path("SQUASH_MSG"), 0) < 0)
 699                        die_errno(_("could not read SQUASH_MSG"));
 700                hook_arg1 = "squash";
 701        } else if (template_file) {
 702                if (strbuf_read_file(&sb, template_file, 0) < 0)
 703                        die_errno(_("could not read '%s'"), template_file);
 704                hook_arg1 = "template";
 705                clean_message_contents = 0;
 706        }
 707
 708        /*
 709         * The remaining cases don't modify the template message, but
 710         * just set the argument(s) to the prepare-commit-msg hook.
 711         */
 712        else if (whence == FROM_MERGE)
 713                hook_arg1 = "merge";
 714        else if (whence == FROM_CHERRY_PICK) {
 715                hook_arg1 = "commit";
 716                hook_arg2 = "CHERRY_PICK_HEAD";
 717        }
 718
 719        if (squash_message) {
 720                /*
 721                 * If squash_commit was used for the commit subject,
 722                 * then we're possibly hijacking other commit log options.
 723                 * Reset the hook args to tell the real story.
 724                 */
 725                hook_arg1 = "message";
 726                hook_arg2 = "";
 727        }
 728
 729        s->fp = fopen(git_path(commit_editmsg), "w");
 730        if (s->fp == NULL)
 731                die_errno(_("could not open '%s'"), git_path(commit_editmsg));
 732
 733        if (clean_message_contents)
 734                stripspace(&sb, 0);
 735
 736        if (signoff) {
 737                struct strbuf sob = STRBUF_INIT;
 738                int i;
 739
 740                strbuf_addstr(&sob, sign_off_header);
 741                strbuf_addstr(&sob, fmt_name(getenv("GIT_COMMITTER_NAME"),
 742                                             getenv("GIT_COMMITTER_EMAIL")));
 743                strbuf_addch(&sob, '\n');
 744                for (i = sb.len - 1; i > 0 && sb.buf[i - 1] != '\n'; i--)
 745                        ; /* do nothing */
 746                if (prefixcmp(sb.buf + i, sob.buf)) {
 747                        if (!i || !ends_rfc2822_footer(&sb))
 748                                strbuf_addch(&sb, '\n');
 749                        strbuf_addbuf(&sb, &sob);
 750                }
 751                strbuf_release(&sob);
 752        }
 753
 754        if (fwrite(sb.buf, 1, sb.len, s->fp) < sb.len)
 755                die_errno(_("could not write commit template"));
 756
 757        strbuf_release(&sb);
 758
 759        /* This checks and barfs if author is badly specified */
 760        determine_author_info(author_ident);
 761
 762        /* This checks if committer ident is explicitly given */
 763        strbuf_addstr(&committer_ident, git_committer_info(0));
 764        if (use_editor && include_status) {
 765                char *ai_tmp, *ci_tmp;
 766                if (whence != FROM_COMMIT)
 767                        status_printf_ln(s, GIT_COLOR_NORMAL,
 768                                _("\n"
 769                                "It looks like you may be committing a %s.\n"
 770                                "If this is not correct, please remove the file\n"
 771                                "       %s\n"
 772                                "and try again.\n"
 773                                ""),
 774                                whence_s(),
 775                                git_path(whence == FROM_MERGE
 776                                         ? "MERGE_HEAD"
 777                                         : "CHERRY_PICK_HEAD"));
 778
 779                fprintf(s->fp, "\n");
 780                status_printf(s, GIT_COLOR_NORMAL,
 781                        _("Please enter the commit message for your changes."));
 782                if (cleanup_mode == CLEANUP_ALL)
 783                        status_printf_more(s, GIT_COLOR_NORMAL,
 784                                _(" Lines starting\n"
 785                                "with '#' will be ignored, and an empty"
 786                                " message aborts the commit.\n"));
 787                else /* CLEANUP_SPACE, that is. */
 788                        status_printf_more(s, GIT_COLOR_NORMAL,
 789                                _(" Lines starting\n"
 790                                "with '#' will be kept; you may remove them"
 791                                " yourself if you want to.\n"
 792                                "An empty message aborts the commit.\n"));
 793                if (only_include_assumed)
 794                        status_printf_ln(s, GIT_COLOR_NORMAL,
 795                                        "%s", only_include_assumed);
 796
 797                ai_tmp = cut_ident_timestamp_part(author_ident->buf);
 798                ci_tmp = cut_ident_timestamp_part(committer_ident.buf);
 799                if (strcmp(author_ident->buf, committer_ident.buf))
 800                        status_printf_ln(s, GIT_COLOR_NORMAL,
 801                                _("%s"
 802                                "Author:    %s"),
 803                                ident_shown++ ? "" : "\n",
 804                                author_ident->buf);
 805
 806                if (!user_ident_sufficiently_given())
 807                        status_printf_ln(s, GIT_COLOR_NORMAL,
 808                                _("%s"
 809                                "Committer: %s"),
 810                                ident_shown++ ? "" : "\n",
 811                                committer_ident.buf);
 812
 813                if (ident_shown)
 814                        status_printf_ln(s, GIT_COLOR_NORMAL, "");
 815
 816                saved_color_setting = s->use_color;
 817                s->use_color = 0;
 818                commitable = run_status(s->fp, index_file, prefix, 1, s);
 819                s->use_color = saved_color_setting;
 820
 821                *ai_tmp = ' ';
 822                *ci_tmp = ' ';
 823        } else {
 824                unsigned char sha1[20];
 825                const char *parent = "HEAD";
 826
 827                if (!active_nr && read_cache() < 0)
 828                        die(_("Cannot read index"));
 829
 830                if (amend)
 831                        parent = "HEAD^1";
 832
 833                if (get_sha1(parent, sha1))
 834                        commitable = !!active_nr;
 835                else
 836                        commitable = index_differs_from(parent, 0);
 837        }
 838        strbuf_release(&committer_ident);
 839
 840        fclose(s->fp);
 841
 842        /*
 843         * Reject an attempt to record a non-merge empty commit without
 844         * explicit --allow-empty. In the cherry-pick case, it may be
 845         * empty due to conflict resolution, which the user should okay.
 846         */
 847        if (!commitable && whence != FROM_MERGE && !allow_empty &&
 848            !(amend && is_a_merge(current_head))) {
 849                run_status(stdout, index_file, prefix, 0, s);
 850                if (amend)
 851                        fputs(_(empty_amend_advice), stderr);
 852                else if (whence == FROM_CHERRY_PICK)
 853                        fputs(_(empty_cherry_pick_advice), stderr);
 854                return 0;
 855        }
 856
 857        /*
 858         * Re-read the index as pre-commit hook could have updated it,
 859         * and write it out as a tree.  We must do this before we invoke
 860         * the editor and after we invoke run_status above.
 861         */
 862        discard_cache();
 863        read_cache_from(index_file);
 864        if (!active_cache_tree)
 865                active_cache_tree = cache_tree();
 866        if (cache_tree_update(active_cache_tree,
 867                              active_cache, active_nr, 0, 0) < 0) {
 868                error(_("Error building trees"));
 869                return 0;
 870        }
 871
 872        if (run_hook(index_file, "prepare-commit-msg",
 873                     git_path(commit_editmsg), hook_arg1, hook_arg2, NULL))
 874                return 0;
 875
 876        if (use_editor) {
 877                char index[PATH_MAX];
 878                const char *env[2] = { NULL };
 879                env[0] =  index;
 880                snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file);
 881                if (launch_editor(git_path(commit_editmsg), NULL, env)) {
 882                        fprintf(stderr,
 883                        _("Please supply the message using either -m or -F option.\n"));
 884                        exit(1);
 885                }
 886        }
 887
 888        if (!no_verify &&
 889            run_hook(index_file, "commit-msg", git_path(commit_editmsg), NULL)) {
 890                return 0;
 891        }
 892
 893        return 1;
 894}
 895
 896/*
 897 * Find out if the message in the strbuf contains only whitespace and
 898 * Signed-off-by lines.
 899 */
 900static int message_is_empty(struct strbuf *sb)
 901{
 902        struct strbuf tmpl = STRBUF_INIT;
 903        const char *nl;
 904        int eol, i, start = 0;
 905
 906        if (cleanup_mode == CLEANUP_NONE && sb->len)
 907                return 0;
 908
 909        /* See if the template is just a prefix of the message. */
 910        if (template_file && strbuf_read_file(&tmpl, template_file, 0) > 0) {
 911                stripspace(&tmpl, cleanup_mode == CLEANUP_ALL);
 912                if (start + tmpl.len <= sb->len &&
 913                    memcmp(tmpl.buf, sb->buf + start, tmpl.len) == 0)
 914                        start += tmpl.len;
 915        }
 916        strbuf_release(&tmpl);
 917
 918        /* Check if the rest is just whitespace and Signed-of-by's. */
 919        for (i = start; i < sb->len; i++) {
 920                nl = memchr(sb->buf + i, '\n', sb->len - i);
 921                if (nl)
 922                        eol = nl - sb->buf;
 923                else
 924                        eol = sb->len;
 925
 926                if (strlen(sign_off_header) <= eol - i &&
 927                    !prefixcmp(sb->buf + i, sign_off_header)) {
 928                        i = eol;
 929                        continue;
 930                }
 931                while (i < eol)
 932                        if (!isspace(sb->buf[i++]))
 933                                return 0;
 934        }
 935
 936        return 1;
 937}
 938
 939static const char *find_author_by_nickname(const char *name)
 940{
 941        struct rev_info revs;
 942        struct commit *commit;
 943        struct strbuf buf = STRBUF_INIT;
 944        const char *av[20];
 945        int ac = 0;
 946
 947        init_revisions(&revs, NULL);
 948        strbuf_addf(&buf, "--author=%s", name);
 949        av[++ac] = "--all";
 950        av[++ac] = "-i";
 951        av[++ac] = buf.buf;
 952        av[++ac] = NULL;
 953        setup_revisions(ac, av, &revs, NULL);
 954        prepare_revision_walk(&revs);
 955        commit = get_revision(&revs);
 956        if (commit) {
 957                struct pretty_print_context ctx = {0};
 958                ctx.date_mode = DATE_NORMAL;
 959                strbuf_release(&buf);
 960                format_commit_message(commit, "%an <%ae>", &buf, &ctx);
 961                return strbuf_detach(&buf, NULL);
 962        }
 963        die(_("No existing author found with '%s'"), name);
 964}
 965
 966
 967static void handle_untracked_files_arg(struct wt_status *s)
 968{
 969        if (!untracked_files_arg)
 970                ; /* default already initialized */
 971        else if (!strcmp(untracked_files_arg, "no"))
 972                s->show_untracked_files = SHOW_NO_UNTRACKED_FILES;
 973        else if (!strcmp(untracked_files_arg, "normal"))
 974                s->show_untracked_files = SHOW_NORMAL_UNTRACKED_FILES;
 975        else if (!strcmp(untracked_files_arg, "all"))
 976                s->show_untracked_files = SHOW_ALL_UNTRACKED_FILES;
 977        else
 978                die(_("Invalid untracked files mode '%s'"), untracked_files_arg);
 979}
 980
 981static const char *read_commit_message(const char *name)
 982{
 983        const char *out_enc, *out;
 984        struct commit *commit;
 985
 986        commit = lookup_commit_reference_by_name(name);
 987        if (!commit)
 988                die(_("could not lookup commit %s"), name);
 989        out_enc = get_commit_output_encoding();
 990        out = logmsg_reencode(commit, out_enc);
 991
 992        /*
 993         * If we failed to reencode the buffer, just copy it
 994         * byte for byte so the user can try to fix it up.
 995         * This also handles the case where input and output
 996         * encodings are identical.
 997         */
 998        if (out == NULL)
 999                out = xstrdup(commit->buffer);
1000        return out;
1001}
1002
1003static int parse_and_validate_options(int argc, const char *argv[],
1004                                      const char * const usage[],
1005                                      const char *prefix,
1006                                      struct commit *current_head,
1007                                      struct wt_status *s)
1008{
1009        int f = 0;
1010
1011        argc = parse_options(argc, argv, prefix, builtin_commit_options, usage,
1012                             0);
1013
1014        if (force_author && !strchr(force_author, '>'))
1015                force_author = find_author_by_nickname(force_author);
1016
1017        if (force_author && renew_authorship)
1018                die(_("Using both --reset-author and --author does not make sense"));
1019
1020        if (logfile || message.len || use_message || fixup_message)
1021                use_editor = 0;
1022        if (edit_flag)
1023                use_editor = 1;
1024        if (!use_editor)
1025                setenv("GIT_EDITOR", ":", 1);
1026
1027        /* Sanity check options */
1028        if (amend && !current_head)
1029                die(_("You have nothing to amend."));
1030        if (amend && whence != FROM_COMMIT)
1031                die(_("You are in the middle of a %s -- cannot amend."), whence_s());
1032        if (fixup_message && squash_message)
1033                die(_("Options --squash and --fixup cannot be used together"));
1034        if (use_message)
1035                f++;
1036        if (edit_message)
1037                f++;
1038        if (fixup_message)
1039                f++;
1040        if (logfile)
1041                f++;
1042        if (f > 1)
1043                die(_("Only one of -c/-C/-F/--fixup can be used."));
1044        if (message.len && f > 0)
1045                die((_("Option -m cannot be combined with -c/-C/-F/--fixup.")));
1046        if (edit_message)
1047                use_message = edit_message;
1048        if (amend && !use_message && !fixup_message)
1049                use_message = "HEAD";
1050        if (!use_message && whence != FROM_CHERRY_PICK && renew_authorship)
1051                die(_("--reset-author can be used only with -C, -c or --amend."));
1052        if (use_message) {
1053                use_message_buffer = read_commit_message(use_message);
1054                if (!renew_authorship) {
1055                        author_message = use_message;
1056                        author_message_buffer = use_message_buffer;
1057                }
1058        }
1059        if (whence == FROM_CHERRY_PICK && !renew_authorship) {
1060                author_message = "CHERRY_PICK_HEAD";
1061                author_message_buffer = read_commit_message(author_message);
1062        }
1063
1064        if (patch_interactive)
1065                interactive = 1;
1066
1067        if (!!also + !!only + !!all + !!interactive > 1)
1068                die(_("Only one of --include/--only/--all/--interactive/--patch can be used."));
1069        if (argc == 0 && (also || (only && !amend)))
1070                die(_("No paths with --include/--only does not make sense."));
1071        if (argc == 0 && only && amend)
1072                only_include_assumed = _("Clever... amending the last one with dirty index.");
1073        if (argc > 0 && !also && !only)
1074                only_include_assumed = _("Explicit paths specified without -i nor -o; assuming --only paths...");
1075        if (!cleanup_arg || !strcmp(cleanup_arg, "default"))
1076                cleanup_mode = use_editor ? CLEANUP_ALL : CLEANUP_SPACE;
1077        else if (!strcmp(cleanup_arg, "verbatim"))
1078                cleanup_mode = CLEANUP_NONE;
1079        else if (!strcmp(cleanup_arg, "whitespace"))
1080                cleanup_mode = CLEANUP_SPACE;
1081        else if (!strcmp(cleanup_arg, "strip"))
1082                cleanup_mode = CLEANUP_ALL;
1083        else
1084                die(_("Invalid cleanup mode %s"), cleanup_arg);
1085
1086        handle_untracked_files_arg(s);
1087
1088        if (all && argc > 0)
1089                die(_("Paths with -a does not make sense."));
1090
1091        if (null_termination && status_format == STATUS_FORMAT_LONG)
1092                status_format = STATUS_FORMAT_PORCELAIN;
1093        if (status_format != STATUS_FORMAT_LONG)
1094                dry_run = 1;
1095
1096        return argc;
1097}
1098
1099static int dry_run_commit(int argc, const char **argv, const char *prefix,
1100                          const struct commit *current_head, struct wt_status *s)
1101{
1102        int commitable;
1103        const char *index_file;
1104
1105        index_file = prepare_index(argc, argv, prefix, current_head, 1);
1106        commitable = run_status(stdout, index_file, prefix, 0, s);
1107        rollback_index_files();
1108
1109        return commitable ? 0 : 1;
1110}
1111
1112static int parse_status_slot(const char *var, int offset)
1113{
1114        if (!strcasecmp(var+offset, "header"))
1115                return WT_STATUS_HEADER;
1116        if (!strcasecmp(var+offset, "branch"))
1117                return WT_STATUS_ONBRANCH;
1118        if (!strcasecmp(var+offset, "updated")
1119                || !strcasecmp(var+offset, "added"))
1120                return WT_STATUS_UPDATED;
1121        if (!strcasecmp(var+offset, "changed"))
1122                return WT_STATUS_CHANGED;
1123        if (!strcasecmp(var+offset, "untracked"))
1124                return WT_STATUS_UNTRACKED;
1125        if (!strcasecmp(var+offset, "nobranch"))
1126                return WT_STATUS_NOBRANCH;
1127        if (!strcasecmp(var+offset, "unmerged"))
1128                return WT_STATUS_UNMERGED;
1129        return -1;
1130}
1131
1132static int git_status_config(const char *k, const char *v, void *cb)
1133{
1134        struct wt_status *s = cb;
1135
1136        if (!strcmp(k, "status.submodulesummary")) {
1137                int is_bool;
1138                s->submodule_summary = git_config_bool_or_int(k, v, &is_bool);
1139                if (is_bool && s->submodule_summary)
1140                        s->submodule_summary = -1;
1141                return 0;
1142        }
1143        if (!strcmp(k, "status.color") || !strcmp(k, "color.status")) {
1144                s->use_color = git_config_colorbool(k, v);
1145                return 0;
1146        }
1147        if (!prefixcmp(k, "status.color.") || !prefixcmp(k, "color.status.")) {
1148                int slot = parse_status_slot(k, 13);
1149                if (slot < 0)
1150                        return 0;
1151                if (!v)
1152                        return config_error_nonbool(k);
1153                color_parse(v, k, s->color_palette[slot]);
1154                return 0;
1155        }
1156        if (!strcmp(k, "status.relativepaths")) {
1157                s->relative_paths = git_config_bool(k, v);
1158                return 0;
1159        }
1160        if (!strcmp(k, "status.showuntrackedfiles")) {
1161                if (!v)
1162                        return config_error_nonbool(k);
1163                else if (!strcmp(v, "no"))
1164                        s->show_untracked_files = SHOW_NO_UNTRACKED_FILES;
1165                else if (!strcmp(v, "normal"))
1166                        s->show_untracked_files = SHOW_NORMAL_UNTRACKED_FILES;
1167                else if (!strcmp(v, "all"))
1168                        s->show_untracked_files = SHOW_ALL_UNTRACKED_FILES;
1169                else
1170                        return error(_("Invalid untracked files mode '%s'"), v);
1171                return 0;
1172        }
1173        return git_diff_ui_config(k, v, NULL);
1174}
1175
1176int cmd_status(int argc, const char **argv, const char *prefix)
1177{
1178        struct wt_status s;
1179        int fd;
1180        unsigned char sha1[20];
1181        static struct option builtin_status_options[] = {
1182                OPT__VERBOSE(&verbose, "be verbose"),
1183                OPT_SET_INT('s', "short", &status_format,
1184                            "show status concisely", STATUS_FORMAT_SHORT),
1185                OPT_BOOLEAN('b', "branch", &status_show_branch,
1186                            "show branch information"),
1187                OPT_SET_INT(0, "porcelain", &status_format,
1188                            "machine-readable output",
1189                            STATUS_FORMAT_PORCELAIN),
1190                OPT_BOOLEAN('z', "null", &null_termination,
1191                            "terminate entries with NUL"),
1192                { OPTION_STRING, 'u', "untracked-files", &untracked_files_arg,
1193                  "mode",
1194                  "show untracked files, optional modes: all, normal, no. (Default: all)",
1195                  PARSE_OPT_OPTARG, NULL, (intptr_t)"all" },
1196                OPT_BOOLEAN(0, "ignored", &show_ignored_in_status,
1197                            "show ignored files"),
1198                { OPTION_STRING, 0, "ignore-submodules", &ignore_submodule_arg, "when",
1199                  "ignore changes to submodules, optional when: all, dirty, untracked. (Default: all)",
1200                  PARSE_OPT_OPTARG, NULL, (intptr_t)"all" },
1201                OPT_END(),
1202        };
1203
1204        if (argc == 2 && !strcmp(argv[1], "-h"))
1205                usage_with_options(builtin_status_usage, builtin_status_options);
1206
1207        wt_status_prepare(&s);
1208        gitmodules_config();
1209        git_config(git_status_config, &s);
1210        determine_whence(&s);
1211        argc = parse_options(argc, argv, prefix,
1212                             builtin_status_options,
1213                             builtin_status_usage, 0);
1214
1215        if (null_termination && status_format == STATUS_FORMAT_LONG)
1216                status_format = STATUS_FORMAT_PORCELAIN;
1217
1218        handle_untracked_files_arg(&s);
1219        if (show_ignored_in_status)
1220                s.show_ignored_files = 1;
1221        if (*argv)
1222                s.pathspec = get_pathspec(prefix, argv);
1223
1224        read_cache_preload(s.pathspec);
1225        refresh_index(&the_index, REFRESH_QUIET|REFRESH_UNMERGED, s.pathspec, NULL, NULL);
1226
1227        fd = hold_locked_index(&index_lock, 0);
1228        if (0 <= fd)
1229                update_index_if_able(&the_index, &index_lock);
1230
1231        s.is_initial = get_sha1(s.reference, sha1) ? 1 : 0;
1232        s.ignore_submodule_arg = ignore_submodule_arg;
1233        wt_status_collect(&s);
1234
1235        if (s.relative_paths)
1236                s.prefix = prefix;
1237
1238        switch (status_format) {
1239        case STATUS_FORMAT_SHORT:
1240                wt_shortstatus_print(&s, null_termination, status_show_branch);
1241                break;
1242        case STATUS_FORMAT_PORCELAIN:
1243                wt_porcelain_print(&s, null_termination);
1244                break;
1245        case STATUS_FORMAT_LONG:
1246                s.verbose = verbose;
1247                s.ignore_submodule_arg = ignore_submodule_arg;
1248                wt_status_print(&s);
1249                break;
1250        }
1251        return 0;
1252}
1253
1254static void print_summary(const char *prefix, const unsigned char *sha1,
1255                          int initial_commit)
1256{
1257        struct rev_info rev;
1258        struct commit *commit;
1259        struct strbuf format = STRBUF_INIT;
1260        unsigned char junk_sha1[20];
1261        const char *head = resolve_ref("HEAD", junk_sha1, 0, NULL);
1262        struct pretty_print_context pctx = {0};
1263        struct strbuf author_ident = STRBUF_INIT;
1264        struct strbuf committer_ident = STRBUF_INIT;
1265
1266        commit = lookup_commit(sha1);
1267        if (!commit)
1268                die(_("couldn't look up newly created commit"));
1269        if (!commit || parse_commit(commit))
1270                die(_("could not parse newly created commit"));
1271
1272        strbuf_addstr(&format, "format:%h] %s");
1273
1274        format_commit_message(commit, "%an <%ae>", &author_ident, &pctx);
1275        format_commit_message(commit, "%cn <%ce>", &committer_ident, &pctx);
1276        if (strbuf_cmp(&author_ident, &committer_ident)) {
1277                strbuf_addstr(&format, "\n Author: ");
1278                strbuf_addbuf_percentquote(&format, &author_ident);
1279        }
1280        if (!user_ident_sufficiently_given()) {
1281                strbuf_addstr(&format, "\n Committer: ");
1282                strbuf_addbuf_percentquote(&format, &committer_ident);
1283                if (advice_implicit_identity) {
1284                        strbuf_addch(&format, '\n');
1285                        strbuf_addstr(&format, _(implicit_ident_advice));
1286                }
1287        }
1288        strbuf_release(&author_ident);
1289        strbuf_release(&committer_ident);
1290
1291        init_revisions(&rev, prefix);
1292        setup_revisions(0, NULL, &rev, NULL);
1293
1294        rev.diff = 1;
1295        rev.diffopt.output_format =
1296                DIFF_FORMAT_SHORTSTAT | DIFF_FORMAT_SUMMARY;
1297
1298        rev.verbose_header = 1;
1299        rev.show_root_diff = 1;
1300        get_commit_format(format.buf, &rev);
1301        rev.always_show_header = 0;
1302        rev.diffopt.detect_rename = 1;
1303        rev.diffopt.break_opt = 0;
1304        diff_setup_done(&rev.diffopt);
1305
1306        printf("[%s%s ",
1307                !prefixcmp(head, "refs/heads/") ?
1308                        head + 11 :
1309                        !strcmp(head, "HEAD") ?
1310                                _("detached HEAD") :
1311                                head,
1312                initial_commit ? _(" (root-commit)") : "");
1313
1314        if (!log_tree_commit(&rev, commit)) {
1315                rev.always_show_header = 1;
1316                rev.use_terminator = 1;
1317                log_tree_commit(&rev, commit);
1318        }
1319
1320        strbuf_release(&format);
1321}
1322
1323static int git_commit_config(const char *k, const char *v, void *cb)
1324{
1325        struct wt_status *s = cb;
1326
1327        if (!strcmp(k, "commit.template"))
1328                return git_config_pathname(&template_file, k, v);
1329        if (!strcmp(k, "commit.status")) {
1330                include_status = git_config_bool(k, v);
1331                return 0;
1332        }
1333
1334        return git_status_config(k, v, s);
1335}
1336
1337static const char post_rewrite_hook[] = "hooks/post-rewrite";
1338
1339static int run_rewrite_hook(const unsigned char *oldsha1,
1340                            const unsigned char *newsha1)
1341{
1342        /* oldsha1 SP newsha1 LF NUL */
1343        static char buf[2*40 + 3];
1344        struct child_process proc;
1345        const char *argv[3];
1346        int code;
1347        size_t n;
1348
1349        if (access(git_path(post_rewrite_hook), X_OK) < 0)
1350                return 0;
1351
1352        argv[0] = git_path(post_rewrite_hook);
1353        argv[1] = "amend";
1354        argv[2] = NULL;
1355
1356        memset(&proc, 0, sizeof(proc));
1357        proc.argv = argv;
1358        proc.in = -1;
1359        proc.stdout_to_stderr = 1;
1360
1361        code = start_command(&proc);
1362        if (code)
1363                return code;
1364        n = snprintf(buf, sizeof(buf), "%s %s\n",
1365                     sha1_to_hex(oldsha1), sha1_to_hex(newsha1));
1366        write_in_full(proc.in, buf, n);
1367        close(proc.in);
1368        return finish_command(&proc);
1369}
1370
1371int cmd_commit(int argc, const char **argv, const char *prefix)
1372{
1373        struct strbuf sb = STRBUF_INIT;
1374        struct strbuf author_ident = STRBUF_INIT;
1375        const char *index_file, *reflog_msg;
1376        char *nl, *p;
1377        unsigned char sha1[20];
1378        struct ref_lock *ref_lock;
1379        struct commit_list *parents = NULL, **pptr = &parents;
1380        struct stat statbuf;
1381        int allow_fast_forward = 1;
1382        struct wt_status s;
1383        struct commit *current_head = NULL;
1384
1385        if (argc == 2 && !strcmp(argv[1], "-h"))
1386                usage_with_options(builtin_commit_usage, builtin_commit_options);
1387
1388        wt_status_prepare(&s);
1389        git_config(git_commit_config, &s);
1390        determine_whence(&s);
1391
1392        if (get_sha1("HEAD", sha1))
1393                current_head = NULL;
1394        else {
1395                current_head = lookup_commit_or_die(sha1, "HEAD");
1396                if (!current_head || parse_commit(current_head))
1397                        die(_("could not parse HEAD commit"));
1398        }
1399        argc = parse_and_validate_options(argc, argv, builtin_commit_usage,
1400                                          prefix, current_head, &s);
1401        if (dry_run)
1402                return dry_run_commit(argc, argv, prefix, current_head, &s);
1403        index_file = prepare_index(argc, argv, prefix, current_head, 0);
1404
1405        /* Set up everything for writing the commit object.  This includes
1406           running hooks, writing the trees, and interacting with the user.  */
1407        if (!prepare_to_commit(index_file, prefix,
1408                               current_head, &s, &author_ident)) {
1409                rollback_index_files();
1410                return 1;
1411        }
1412
1413        /* Determine parents */
1414        reflog_msg = getenv("GIT_REFLOG_ACTION");
1415        if (!current_head) {
1416                if (!reflog_msg)
1417                        reflog_msg = "commit (initial)";
1418        } else if (amend) {
1419                struct commit_list *c;
1420
1421                if (!reflog_msg)
1422                        reflog_msg = "commit (amend)";
1423                for (c = current_head->parents; c; c = c->next)
1424                        pptr = &commit_list_insert(c->item, pptr)->next;
1425        } else if (whence == FROM_MERGE) {
1426                struct strbuf m = STRBUF_INIT;
1427                struct commit *commit;
1428                FILE *fp;
1429
1430                if (!reflog_msg)
1431                        reflog_msg = "commit (merge)";
1432                pptr = &commit_list_insert(current_head, pptr)->next;
1433                fp = fopen(git_path("MERGE_HEAD"), "r");
1434                if (fp == NULL)
1435                        die_errno(_("could not open '%s' for reading"),
1436                                  git_path("MERGE_HEAD"));
1437                while (strbuf_getline(&m, fp, '\n') != EOF) {
1438                        unsigned char sha1[20];
1439                        if (get_sha1_hex(m.buf, sha1) < 0)
1440                                die(_("Corrupt MERGE_HEAD file (%s)"), m.buf);
1441                        commit = lookup_commit_or_die(sha1, "MERGE_HEAD");
1442                        pptr = &commit_list_insert(commit, pptr)->next;
1443                }
1444                fclose(fp);
1445                strbuf_release(&m);
1446                if (!stat(git_path("MERGE_MODE"), &statbuf)) {
1447                        if (strbuf_read_file(&sb, git_path("MERGE_MODE"), 0) < 0)
1448                                die_errno(_("could not read MERGE_MODE"));
1449                        if (!strcmp(sb.buf, "no-ff"))
1450                                allow_fast_forward = 0;
1451                }
1452                if (allow_fast_forward)
1453                        parents = reduce_heads(parents);
1454        } else {
1455                if (!reflog_msg)
1456                        reflog_msg = (whence == FROM_CHERRY_PICK)
1457                                        ? "commit (cherry-pick)"
1458                                        : "commit";
1459                pptr = &commit_list_insert(current_head, pptr)->next;
1460        }
1461
1462        /* Finally, get the commit message */
1463        strbuf_reset(&sb);
1464        if (strbuf_read_file(&sb, git_path(commit_editmsg), 0) < 0) {
1465                int saved_errno = errno;
1466                rollback_index_files();
1467                die(_("could not read commit message: %s"), strerror(saved_errno));
1468        }
1469
1470        /* Truncate the message just before the diff, if any. */
1471        if (verbose) {
1472                p = strstr(sb.buf, "\ndiff --git ");
1473                if (p != NULL)
1474                        strbuf_setlen(&sb, p - sb.buf + 1);
1475        }
1476
1477        if (cleanup_mode != CLEANUP_NONE)
1478                stripspace(&sb, cleanup_mode == CLEANUP_ALL);
1479        if (message_is_empty(&sb) && !allow_empty_message) {
1480                rollback_index_files();
1481                fprintf(stderr, _("Aborting commit due to empty commit message.\n"));
1482                exit(1);
1483        }
1484
1485        if (commit_tree(sb.buf, active_cache_tree->sha1, parents, sha1,
1486                        author_ident.buf)) {
1487                rollback_index_files();
1488                die(_("failed to write commit object"));
1489        }
1490        strbuf_release(&author_ident);
1491
1492        ref_lock = lock_any_ref_for_update("HEAD",
1493                                           !current_head
1494                                           ? NULL
1495                                           : current_head->object.sha1,
1496                                           0);
1497
1498        nl = strchr(sb.buf, '\n');
1499        if (nl)
1500                strbuf_setlen(&sb, nl + 1 - sb.buf);
1501        else
1502                strbuf_addch(&sb, '\n');
1503        strbuf_insert(&sb, 0, reflog_msg, strlen(reflog_msg));
1504        strbuf_insert(&sb, strlen(reflog_msg), ": ", 2);
1505
1506        if (!ref_lock) {
1507                rollback_index_files();
1508                die(_("cannot lock HEAD ref"));
1509        }
1510        if (write_ref_sha1(ref_lock, sha1, sb.buf) < 0) {
1511                rollback_index_files();
1512                die(_("cannot update HEAD ref"));
1513        }
1514
1515        unlink(git_path("CHERRY_PICK_HEAD"));
1516        unlink(git_path("MERGE_HEAD"));
1517        unlink(git_path("MERGE_MSG"));
1518        unlink(git_path("MERGE_MODE"));
1519        unlink(git_path("SQUASH_MSG"));
1520
1521        if (commit_index_files())
1522                die (_("Repository has been updated, but unable to write\n"
1523                     "new_index file. Check that disk is not full or quota is\n"
1524                     "not exceeded, and then \"git reset HEAD\" to recover."));
1525
1526        rerere(0);
1527        run_hook(get_index_file(), "post-commit", NULL);
1528        if (amend && !no_post_rewrite) {
1529                struct notes_rewrite_cfg *cfg;
1530                cfg = init_copy_notes_for_rewrite("amend");
1531                if (cfg) {
1532                        /* we are amending, so current_head is not NULL */
1533                        copy_note_for_rewrite(cfg, current_head->object.sha1, sha1);
1534                        finish_copy_notes_for_rewrite(cfg);
1535                }
1536                run_rewrite_hook(current_head->object.sha1, sha1);
1537        }
1538        if (!quiet)
1539                print_summary(prefix, sha1, !current_head);
1540
1541        return 0;
1542}