builtin / commit.con commit Merge branch 'jc/fix-add-u-unmerged' (f7d59e2)
   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 unsigned char head_sha1[20];
  66
  67static const char *use_message_buffer;
  68static const char commit_editmsg[] = "COMMIT_EDITMSG";
  69static struct lock_file index_lock; /* real index */
  70static struct lock_file false_lock; /* used only for partial commits */
  71static enum {
  72        COMMIT_AS_IS = 1,
  73        COMMIT_NORMAL,
  74        COMMIT_PARTIAL
  75} commit_style;
  76
  77static const char *logfile, *force_author;
  78static const char *template_file;
  79/*
  80 * The _message variables are commit names from which to take
  81 * the commit message and/or authorship.
  82 */
  83static const char *author_message, *author_message_buffer;
  84static char *edit_message, *use_message;
  85static char *fixup_message, *squash_message;
  86static int all, edit_flag, also, interactive, only, amend, signoff;
  87static int quiet, verbose, no_verify, allow_empty, dry_run, renew_authorship;
  88static int no_post_rewrite, allow_empty_message;
  89static char *untracked_files_arg, *force_date, *ignore_submodule_arg;
  90/*
  91 * The default commit message cleanup mode will remove the lines
  92 * beginning with # (shell comments) and leading and trailing
  93 * whitespaces (empty lines or containing only whitespaces)
  94 * if editor is used, and only the whitespaces if the message
  95 * is specified explicitly.
  96 */
  97static enum {
  98        CLEANUP_SPACE,
  99        CLEANUP_NONE,
 100        CLEANUP_ALL
 101} cleanup_mode;
 102static char *cleanup_arg;
 103
 104static enum commit_whence whence;
 105static int use_editor = 1, initial_commit, include_status = 1;
 106static int show_ignored_in_status;
 107static const char *only_include_assumed;
 108static struct strbuf message;
 109
 110static int null_termination;
 111static enum {
 112        STATUS_FORMAT_LONG,
 113        STATUS_FORMAT_SHORT,
 114        STATUS_FORMAT_PORCELAIN
 115} status_format = STATUS_FORMAT_LONG;
 116static int status_show_branch;
 117
 118static int opt_parse_m(const struct option *opt, const char *arg, int unset)
 119{
 120        struct strbuf *buf = opt->value;
 121        if (unset)
 122                strbuf_setlen(buf, 0);
 123        else {
 124                strbuf_addstr(buf, arg);
 125                strbuf_addstr(buf, "\n\n");
 126        }
 127        return 0;
 128}
 129
 130static struct option builtin_commit_options[] = {
 131        OPT__QUIET(&quiet, "suppress summary after successful commit"),
 132        OPT__VERBOSE(&verbose, "show diff in commit message template"),
 133
 134        OPT_GROUP("Commit message options"),
 135        OPT_FILENAME('F', "file", &logfile, "read message from file"),
 136        OPT_STRING(0, "author", &force_author, "author", "override author for commit"),
 137        OPT_STRING(0, "date", &force_date, "date", "override date for commit"),
 138        OPT_CALLBACK('m', "message", &message, "message", "commit message", opt_parse_m),
 139        OPT_STRING('c', "reedit-message", &edit_message, "commit", "reuse and edit message from specified commit"),
 140        OPT_STRING('C', "reuse-message", &use_message, "commit", "reuse message from specified commit"),
 141        OPT_STRING(0, "fixup", &fixup_message, "commit", "use autosquash formatted message to fixup specified commit"),
 142        OPT_STRING(0, "squash", &squash_message, "commit", "use autosquash formatted message to squash specified commit"),
 143        OPT_BOOLEAN(0, "reset-author", &renew_authorship, "the commit is authored by me now (used with -C-c/--amend)"),
 144        OPT_BOOLEAN('s', "signoff", &signoff, "add Signed-off-by:"),
 145        OPT_FILENAME('t', "template", &template_file, "use specified template file"),
 146        OPT_BOOLEAN('e', "edit", &edit_flag, "force edit of commit"),
 147        OPT_STRING(0, "cleanup", &cleanup_arg, "default", "how to strip spaces and #comments from message"),
 148        OPT_BOOLEAN(0, "status", &include_status, "include status in commit message template"),
 149        /* end commit message options */
 150
 151        OPT_GROUP("Commit contents options"),
 152        OPT_BOOLEAN('a', "all", &all, "commit all changed files"),
 153        OPT_BOOLEAN('i', "include", &also, "add specified files to index for commit"),
 154        OPT_BOOLEAN(0, "interactive", &interactive, "interactively add files"),
 155        OPT_BOOLEAN('o', "only", &only, "commit only specified files"),
 156        OPT_BOOLEAN('n', "no-verify", &no_verify, "bypass pre-commit hook"),
 157        OPT_BOOLEAN(0, "dry-run", &dry_run, "show what would be committed"),
 158        OPT_SET_INT(0, "short", &status_format, "show status concisely",
 159                    STATUS_FORMAT_SHORT),
 160        OPT_BOOLEAN(0, "branch", &status_show_branch, "show branch information"),
 161        OPT_SET_INT(0, "porcelain", &status_format,
 162                    "machine-readable output", STATUS_FORMAT_PORCELAIN),
 163        OPT_BOOLEAN('z', "null", &null_termination,
 164                    "terminate entries with NUL"),
 165        OPT_BOOLEAN(0, "amend", &amend, "amend previous commit"),
 166        OPT_BOOLEAN(0, "no-post-rewrite", &no_post_rewrite, "bypass post-rewrite hook"),
 167        { 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" },
 168        /* end commit contents options */
 169
 170        { OPTION_BOOLEAN, 0, "allow-empty", &allow_empty, NULL,
 171          "ok to record an empty change",
 172          PARSE_OPT_NOARG | PARSE_OPT_HIDDEN },
 173        { OPTION_BOOLEAN, 0, "allow-empty-message", &allow_empty_message, NULL,
 174          "ok to record a change with an empty message",
 175          PARSE_OPT_NOARG | PARSE_OPT_HIDDEN },
 176
 177        OPT_END()
 178};
 179
 180static void determine_whence(struct wt_status *s)
 181{
 182        if (file_exists(git_path("MERGE_HEAD")))
 183                whence = FROM_MERGE;
 184        else if (file_exists(git_path("CHERRY_PICK_HEAD")))
 185                whence = FROM_CHERRY_PICK;
 186        else
 187                whence = FROM_COMMIT;
 188        if (s)
 189                s->whence = whence;
 190}
 191
 192static const char *whence_s(void)
 193{
 194        char *s = "";
 195
 196        switch (whence) {
 197        case FROM_COMMIT:
 198                break;
 199        case FROM_MERGE:
 200                s = "merge";
 201                break;
 202        case FROM_CHERRY_PICK:
 203                s = "cherry-pick";
 204                break;
 205        }
 206
 207        return s;
 208}
 209
 210static void rollback_index_files(void)
 211{
 212        switch (commit_style) {
 213        case COMMIT_AS_IS:
 214                break; /* nothing to do */
 215        case COMMIT_NORMAL:
 216                rollback_lock_file(&index_lock);
 217                break;
 218        case COMMIT_PARTIAL:
 219                rollback_lock_file(&index_lock);
 220                rollback_lock_file(&false_lock);
 221                break;
 222        }
 223}
 224
 225static int commit_index_files(void)
 226{
 227        int err = 0;
 228
 229        switch (commit_style) {
 230        case COMMIT_AS_IS:
 231                break; /* nothing to do */
 232        case COMMIT_NORMAL:
 233                err = commit_lock_file(&index_lock);
 234                break;
 235        case COMMIT_PARTIAL:
 236                err = commit_lock_file(&index_lock);
 237                rollback_lock_file(&false_lock);
 238                break;
 239        }
 240
 241        return err;
 242}
 243
 244/*
 245 * Take a union of paths in the index and the named tree (typically, "HEAD"),
 246 * and return the paths that match the given pattern in list.
 247 */
 248static int list_paths(struct string_list *list, const char *with_tree,
 249                      const char *prefix, const char **pattern)
 250{
 251        int i;
 252        char *m;
 253
 254        for (i = 0; pattern[i]; i++)
 255                ;
 256        m = xcalloc(1, i);
 257
 258        if (with_tree)
 259                overlay_tree_on_cache(with_tree, prefix);
 260
 261        for (i = 0; i < active_nr; i++) {
 262                struct cache_entry *ce = active_cache[i];
 263                struct string_list_item *item;
 264
 265                if (ce->ce_flags & CE_UPDATE)
 266                        continue;
 267                if (!match_pathspec(pattern, ce->name, ce_namelen(ce), 0, m))
 268                        continue;
 269                item = string_list_insert(list, ce->name);
 270                if (ce_skip_worktree(ce))
 271                        item->util = item; /* better a valid pointer than a fake one */
 272        }
 273
 274        return report_path_error(m, pattern, prefix ? strlen(prefix) : 0);
 275}
 276
 277static void add_remove_files(struct string_list *list)
 278{
 279        int i;
 280        for (i = 0; i < list->nr; i++) {
 281                struct stat st;
 282                struct string_list_item *p = &(list->items[i]);
 283
 284                /* p->util is skip-worktree */
 285                if (p->util)
 286                        continue;
 287
 288                if (!lstat(p->string, &st)) {
 289                        if (add_to_cache(p->string, &st, 0))
 290                                die(_("updating files failed"));
 291                } else
 292                        remove_file_from_cache(p->string);
 293        }
 294}
 295
 296static void create_base_index(void)
 297{
 298        struct tree *tree;
 299        struct unpack_trees_options opts;
 300        struct tree_desc t;
 301
 302        if (initial_commit) {
 303                discard_cache();
 304                return;
 305        }
 306
 307        memset(&opts, 0, sizeof(opts));
 308        opts.head_idx = 1;
 309        opts.index_only = 1;
 310        opts.merge = 1;
 311        opts.src_index = &the_index;
 312        opts.dst_index = &the_index;
 313
 314        opts.fn = oneway_merge;
 315        tree = parse_tree_indirect(head_sha1);
 316        if (!tree)
 317                die(_("failed to unpack HEAD tree object"));
 318        parse_tree(tree);
 319        init_tree_desc(&t, tree->buffer, tree->size);
 320        if (unpack_trees(1, &t, &opts))
 321                exit(128); /* We've already reported the error, finish dying */
 322}
 323
 324static void refresh_cache_or_die(int refresh_flags)
 325{
 326        /*
 327         * refresh_flags contains REFRESH_QUIET, so the only errors
 328         * are for unmerged entries.
 329         */
 330        if (refresh_cache(refresh_flags | REFRESH_IN_PORCELAIN))
 331                die_resolve_conflict("commit");
 332}
 333
 334static char *prepare_index(int argc, const char **argv, const char *prefix, int is_status)
 335{
 336        int fd;
 337        struct string_list partial;
 338        const char **pathspec = NULL;
 339        int refresh_flags = REFRESH_QUIET;
 340
 341        if (is_status)
 342                refresh_flags |= REFRESH_UNMERGED;
 343        if (interactive) {
 344                if (interactive_add(argc, argv, prefix) != 0)
 345                        die(_("interactive add failed"));
 346                if (read_cache_preload(NULL) < 0)
 347                        die(_("index file corrupt"));
 348                commit_style = COMMIT_AS_IS;
 349                return get_index_file();
 350        }
 351
 352        if (*argv)
 353                pathspec = get_pathspec(prefix, argv);
 354
 355        if (read_cache_preload(pathspec) < 0)
 356                die(_("index file corrupt"));
 357
 358        /*
 359         * Non partial, non as-is commit.
 360         *
 361         * (1) get the real index;
 362         * (2) update the_index as necessary;
 363         * (3) write the_index out to the real index (still locked);
 364         * (4) return the name of the locked index file.
 365         *
 366         * The caller should run hooks on the locked real index, and
 367         * (A) if all goes well, commit the real index;
 368         * (B) on failure, rollback the real index.
 369         */
 370        if (all || (also && pathspec && *pathspec)) {
 371                fd = hold_locked_index(&index_lock, 1);
 372                add_files_to_cache(also ? prefix : NULL, pathspec, 0);
 373                refresh_cache_or_die(refresh_flags);
 374                if (write_cache(fd, active_cache, active_nr) ||
 375                    close_lock_file(&index_lock))
 376                        die(_("unable to write new_index file"));
 377                commit_style = COMMIT_NORMAL;
 378                return index_lock.filename;
 379        }
 380
 381        /*
 382         * As-is commit.
 383         *
 384         * (1) return the name of the real index file.
 385         *
 386         * The caller should run hooks on the real index,
 387         * and create commit from the_index.
 388         * We still need to refresh the index here.
 389         */
 390        if (!pathspec || !*pathspec) {
 391                fd = hold_locked_index(&index_lock, 1);
 392                refresh_cache_or_die(refresh_flags);
 393                if (active_cache_changed) {
 394                        if (write_cache(fd, active_cache, active_nr) ||
 395                            commit_locked_index(&index_lock))
 396                                die(_("unable to write new_index file"));
 397                } else {
 398                        rollback_lock_file(&index_lock);
 399                }
 400                commit_style = COMMIT_AS_IS;
 401                return get_index_file();
 402        }
 403
 404        /*
 405         * A partial commit.
 406         *
 407         * (0) find the set of affected paths;
 408         * (1) get lock on the real index file;
 409         * (2) update the_index with the given paths;
 410         * (3) write the_index out to the real index (still locked);
 411         * (4) get lock on the false index file;
 412         * (5) reset the_index from HEAD;
 413         * (6) update the_index the same way as (2);
 414         * (7) write the_index out to the false index file;
 415         * (8) return the name of the false index file (still locked);
 416         *
 417         * The caller should run hooks on the locked false index, and
 418         * create commit from it.  Then
 419         * (A) if all goes well, commit the real index;
 420         * (B) on failure, rollback the real index;
 421         * In either case, rollback the false index.
 422         */
 423        commit_style = COMMIT_PARTIAL;
 424
 425        if (whence != FROM_COMMIT)
 426                die(_("cannot do a partial commit during a %s."), whence_s());
 427
 428        memset(&partial, 0, sizeof(partial));
 429        partial.strdup_strings = 1;
 430        if (list_paths(&partial, initial_commit ? NULL : "HEAD", prefix, pathspec))
 431                exit(1);
 432
 433        discard_cache();
 434        if (read_cache() < 0)
 435                die(_("cannot read the index"));
 436
 437        fd = hold_locked_index(&index_lock, 1);
 438        add_remove_files(&partial);
 439        refresh_cache(REFRESH_QUIET);
 440        if (write_cache(fd, active_cache, active_nr) ||
 441            close_lock_file(&index_lock))
 442                die(_("unable to write new_index file"));
 443
 444        fd = hold_lock_file_for_update(&false_lock,
 445                                       git_path("next-index-%"PRIuMAX,
 446                                                (uintmax_t) getpid()),
 447                                       LOCK_DIE_ON_ERROR);
 448
 449        create_base_index();
 450        add_remove_files(&partial);
 451        refresh_cache(REFRESH_QUIET);
 452
 453        if (write_cache(fd, active_cache, active_nr) ||
 454            close_lock_file(&false_lock))
 455                die(_("unable to write temporary index file"));
 456
 457        discard_cache();
 458        read_cache_from(false_lock.filename);
 459
 460        return false_lock.filename;
 461}
 462
 463static int run_status(FILE *fp, const char *index_file, const char *prefix, int nowarn,
 464                      struct wt_status *s)
 465{
 466        unsigned char sha1[20];
 467
 468        if (s->relative_paths)
 469                s->prefix = prefix;
 470
 471        if (amend) {
 472                s->amend = 1;
 473                s->reference = "HEAD^1";
 474        }
 475        s->verbose = verbose;
 476        s->index_file = index_file;
 477        s->fp = fp;
 478        s->nowarn = nowarn;
 479        s->is_initial = get_sha1(s->reference, sha1) ? 1 : 0;
 480
 481        wt_status_collect(s);
 482
 483        switch (status_format) {
 484        case STATUS_FORMAT_SHORT:
 485                wt_shortstatus_print(s, null_termination, status_show_branch);
 486                break;
 487        case STATUS_FORMAT_PORCELAIN:
 488                wt_porcelain_print(s, null_termination);
 489                break;
 490        case STATUS_FORMAT_LONG:
 491                wt_status_print(s);
 492                break;
 493        }
 494
 495        return s->commitable;
 496}
 497
 498static int is_a_merge(const unsigned char *sha1)
 499{
 500        struct commit *commit = lookup_commit(sha1);
 501        if (!commit || parse_commit(commit))
 502                die(_("could not parse HEAD commit"));
 503        return !!(commit->parents && commit->parents->next);
 504}
 505
 506static const char sign_off_header[] = "Signed-off-by: ";
 507
 508static void determine_author_info(struct strbuf *author_ident)
 509{
 510        char *name, *email, *date;
 511
 512        name = getenv("GIT_AUTHOR_NAME");
 513        email = getenv("GIT_AUTHOR_EMAIL");
 514        date = getenv("GIT_AUTHOR_DATE");
 515
 516        if (author_message) {
 517                const char *a, *lb, *rb, *eol;
 518
 519                a = strstr(author_message_buffer, "\nauthor ");
 520                if (!a)
 521                        die(_("invalid commit: %s"), author_message);
 522
 523                lb = strchrnul(a + strlen("\nauthor "), '<');
 524                rb = strchrnul(lb, '>');
 525                eol = strchrnul(rb, '\n');
 526                if (!*lb || !*rb || !*eol)
 527                        die(_("invalid commit: %s"), author_message);
 528
 529                if (lb == a + strlen("\nauthor "))
 530                        /* \nauthor <foo@example.com> */
 531                        name = xcalloc(1, 1);
 532                else
 533                        name = xmemdupz(a + strlen("\nauthor "),
 534                                        (lb - strlen(" ") -
 535                                         (a + strlen("\nauthor "))));
 536                email = xmemdupz(lb + strlen("<"), rb - (lb + strlen("<")));
 537                date = xmemdupz(rb + strlen("> "), eol - (rb + strlen("> ")));
 538        }
 539
 540        if (force_author) {
 541                const char *lb = strstr(force_author, " <");
 542                const char *rb = strchr(force_author, '>');
 543
 544                if (!lb || !rb)
 545                        die(_("malformed --author parameter"));
 546                name = xstrndup(force_author, lb - force_author);
 547                email = xstrndup(lb + 2, rb - (lb + 2));
 548        }
 549
 550        if (force_date)
 551                date = force_date;
 552        strbuf_addstr(author_ident, fmt_ident(name, email, date,
 553                                              IDENT_ERROR_ON_NO_NAME));
 554}
 555
 556static int ends_rfc2822_footer(struct strbuf *sb)
 557{
 558        int ch;
 559        int hit = 0;
 560        int i, j, k;
 561        int len = sb->len;
 562        int first = 1;
 563        const char *buf = sb->buf;
 564
 565        for (i = len - 1; i > 0; i--) {
 566                if (hit && buf[i] == '\n')
 567                        break;
 568                hit = (buf[i] == '\n');
 569        }
 570
 571        while (i < len - 1 && buf[i] == '\n')
 572                i++;
 573
 574        for (; i < len; i = k) {
 575                for (k = i; k < len && buf[k] != '\n'; k++)
 576                        ; /* do nothing */
 577                k++;
 578
 579                if ((buf[k] == ' ' || buf[k] == '\t') && !first)
 580                        continue;
 581
 582                first = 0;
 583
 584                for (j = 0; i + j < len; j++) {
 585                        ch = buf[i + j];
 586                        if (ch == ':')
 587                                break;
 588                        if (isalnum(ch) ||
 589                            (ch == '-'))
 590                                continue;
 591                        return 0;
 592                }
 593        }
 594        return 1;
 595}
 596
 597static char *cut_ident_timestamp_part(char *string)
 598{
 599        char *ket = strrchr(string, '>');
 600        if (!ket || ket[1] != ' ')
 601                die(_("Malformed ident string: '%s'"), string);
 602        *++ket = '\0';
 603        return ket;
 604}
 605
 606static int prepare_to_commit(const char *index_file, const char *prefix,
 607                             struct wt_status *s,
 608                             struct strbuf *author_ident)
 609{
 610        struct stat statbuf;
 611        struct strbuf committer_ident = STRBUF_INIT;
 612        int commitable, saved_color_setting;
 613        struct strbuf sb = STRBUF_INIT;
 614        char *buffer;
 615        const char *hook_arg1 = NULL;
 616        const char *hook_arg2 = NULL;
 617        int ident_shown = 0;
 618
 619        if (!no_verify && run_hook(index_file, "pre-commit", NULL))
 620                return 0;
 621
 622        if (squash_message) {
 623                /*
 624                 * Insert the proper subject line before other commit
 625                 * message options add their content.
 626                 */
 627                if (use_message && !strcmp(use_message, squash_message))
 628                        strbuf_addstr(&sb, "squash! ");
 629                else {
 630                        struct pretty_print_context ctx = {0};
 631                        struct commit *c;
 632                        c = lookup_commit_reference_by_name(squash_message);
 633                        if (!c)
 634                                die(_("could not lookup commit %s"), squash_message);
 635                        ctx.output_encoding = get_commit_output_encoding();
 636                        format_commit_message(c, "squash! %s\n\n", &sb,
 637                                              &ctx);
 638                }
 639        }
 640
 641        if (message.len) {
 642                strbuf_addbuf(&sb, &message);
 643                hook_arg1 = "message";
 644        } else if (logfile && !strcmp(logfile, "-")) {
 645                if (isatty(0))
 646                        fprintf(stderr, _("(reading log message from standard input)\n"));
 647                if (strbuf_read(&sb, 0, 0) < 0)
 648                        die_errno(_("could not read log from standard input"));
 649                hook_arg1 = "message";
 650        } else if (logfile) {
 651                if (strbuf_read_file(&sb, logfile, 0) < 0)
 652                        die_errno(_("could not read log file '%s'"),
 653                                  logfile);
 654                hook_arg1 = "message";
 655        } else if (use_message) {
 656                buffer = strstr(use_message_buffer, "\n\n");
 657                if (!buffer || buffer[2] == '\0')
 658                        die(_("commit has empty message"));
 659                strbuf_add(&sb, buffer + 2, strlen(buffer + 2));
 660                hook_arg1 = "commit";
 661                hook_arg2 = use_message;
 662        } else if (fixup_message) {
 663                struct pretty_print_context ctx = {0};
 664                struct commit *commit;
 665                commit = lookup_commit_reference_by_name(fixup_message);
 666                if (!commit)
 667                        die(_("could not lookup commit %s"), fixup_message);
 668                ctx.output_encoding = get_commit_output_encoding();
 669                format_commit_message(commit, "fixup! %s\n\n",
 670                                      &sb, &ctx);
 671                hook_arg1 = "message";
 672        } else if (!stat(git_path("MERGE_MSG"), &statbuf)) {
 673                if (strbuf_read_file(&sb, git_path("MERGE_MSG"), 0) < 0)
 674                        die_errno(_("could not read MERGE_MSG"));
 675                hook_arg1 = "merge";
 676        } else if (!stat(git_path("SQUASH_MSG"), &statbuf)) {
 677                if (strbuf_read_file(&sb, git_path("SQUASH_MSG"), 0) < 0)
 678                        die_errno(_("could not read SQUASH_MSG"));
 679                hook_arg1 = "squash";
 680        } else if (template_file) {
 681                if (strbuf_read_file(&sb, template_file, 0) < 0)
 682                        die_errno(_("could not read '%s'"), template_file);
 683                hook_arg1 = "template";
 684        }
 685
 686        /*
 687         * The remaining cases don't modify the template message, but
 688         * just set the argument(s) to the prepare-commit-msg hook.
 689         */
 690        else if (whence == FROM_MERGE)
 691                hook_arg1 = "merge";
 692        else if (whence == FROM_CHERRY_PICK) {
 693                hook_arg1 = "commit";
 694                hook_arg2 = "CHERRY_PICK_HEAD";
 695        }
 696
 697        if (squash_message) {
 698                /*
 699                 * If squash_commit was used for the commit subject,
 700                 * then we're possibly hijacking other commit log options.
 701                 * Reset the hook args to tell the real story.
 702                 */
 703                hook_arg1 = "message";
 704                hook_arg2 = "";
 705        }
 706
 707        s->fp = fopen(git_path(commit_editmsg), "w");
 708        if (s->fp == NULL)
 709                die_errno(_("could not open '%s'"), git_path(commit_editmsg));
 710
 711        if (cleanup_mode != CLEANUP_NONE)
 712                stripspace(&sb, 0);
 713
 714        if (signoff) {
 715                struct strbuf sob = STRBUF_INIT;
 716                int i;
 717
 718                strbuf_addstr(&sob, sign_off_header);
 719                strbuf_addstr(&sob, fmt_name(getenv("GIT_COMMITTER_NAME"),
 720                                             getenv("GIT_COMMITTER_EMAIL")));
 721                strbuf_addch(&sob, '\n');
 722                for (i = sb.len - 1; i > 0 && sb.buf[i - 1] != '\n'; i--)
 723                        ; /* do nothing */
 724                if (prefixcmp(sb.buf + i, sob.buf)) {
 725                        if (!i || !ends_rfc2822_footer(&sb))
 726                                strbuf_addch(&sb, '\n');
 727                        strbuf_addbuf(&sb, &sob);
 728                }
 729                strbuf_release(&sob);
 730        }
 731
 732        if (fwrite(sb.buf, 1, sb.len, s->fp) < sb.len)
 733                die_errno(_("could not write commit template"));
 734
 735        strbuf_release(&sb);
 736
 737        /* This checks and barfs if author is badly specified */
 738        determine_author_info(author_ident);
 739
 740        /* This checks if committer ident is explicitly given */
 741        strbuf_addstr(&committer_ident, git_committer_info(0));
 742        if (use_editor && include_status) {
 743                char *ai_tmp, *ci_tmp;
 744                if (whence != FROM_COMMIT)
 745                        status_printf_ln(s, GIT_COLOR_NORMAL,
 746                                _("\n"
 747                                "It looks like you may be committing a %s.\n"
 748                                "If this is not correct, please remove the file\n"
 749                                "       %s\n"
 750                                "and try again.\n"
 751                                ""),
 752                                whence_s(),
 753                                git_path(whence == FROM_MERGE
 754                                         ? "MERGE_HEAD"
 755                                         : "CHERRY_PICK_HEAD"));
 756
 757                fprintf(s->fp, "\n");
 758                status_printf(s, GIT_COLOR_NORMAL,
 759                        _("Please enter the commit message for your changes."));
 760                if (cleanup_mode == CLEANUP_ALL)
 761                        status_printf_more(s, GIT_COLOR_NORMAL,
 762                                _(" Lines starting\n"
 763                                "with '#' will be ignored, and an empty"
 764                                " message aborts the commit.\n"));
 765                else /* CLEANUP_SPACE, that is. */
 766                        status_printf_more(s, GIT_COLOR_NORMAL,
 767                                _(" Lines starting\n"
 768                                "with '#' will be kept; you may remove them"
 769                                " yourself if you want to.\n"
 770                                "An empty message aborts the commit.\n"));
 771                if (only_include_assumed)
 772                        status_printf_ln(s, GIT_COLOR_NORMAL,
 773                                        "%s", only_include_assumed);
 774
 775                ai_tmp = cut_ident_timestamp_part(author_ident->buf);
 776                ci_tmp = cut_ident_timestamp_part(committer_ident.buf);
 777                if (strcmp(author_ident->buf, committer_ident.buf))
 778                        status_printf_ln(s, GIT_COLOR_NORMAL,
 779                                _("%s"
 780                                "Author:    %s"),
 781                                ident_shown++ ? "" : "\n",
 782                                author_ident->buf);
 783
 784                if (!user_ident_sufficiently_given())
 785                        status_printf_ln(s, GIT_COLOR_NORMAL,
 786                                _("%s"
 787                                "Committer: %s"),
 788                                ident_shown++ ? "" : "\n",
 789                                committer_ident.buf);
 790
 791                if (ident_shown)
 792                        status_printf_ln(s, GIT_COLOR_NORMAL, "");
 793
 794                saved_color_setting = s->use_color;
 795                s->use_color = 0;
 796                commitable = run_status(s->fp, index_file, prefix, 1, s);
 797                s->use_color = saved_color_setting;
 798
 799                *ai_tmp = ' ';
 800                *ci_tmp = ' ';
 801        } else {
 802                unsigned char sha1[20];
 803                const char *parent = "HEAD";
 804
 805                if (!active_nr && read_cache() < 0)
 806                        die(_("Cannot read index"));
 807
 808                if (amend)
 809                        parent = "HEAD^1";
 810
 811                if (get_sha1(parent, sha1))
 812                        commitable = !!active_nr;
 813                else
 814                        commitable = index_differs_from(parent, 0);
 815        }
 816        strbuf_release(&committer_ident);
 817
 818        fclose(s->fp);
 819
 820        /*
 821         * Reject an attempt to record a non-merge empty commit without
 822         * explicit --allow-empty. In the cherry-pick case, it may be
 823         * empty due to conflict resolution, which the user should okay.
 824         */
 825        if (!commitable && whence != FROM_MERGE && !allow_empty &&
 826            !(amend && is_a_merge(head_sha1))) {
 827                run_status(stdout, index_file, prefix, 0, s);
 828                if (amend)
 829                        fputs(_(empty_amend_advice), stderr);
 830                else if (whence == FROM_CHERRY_PICK)
 831                        fputs(_(empty_cherry_pick_advice), stderr);
 832                return 0;
 833        }
 834
 835        /*
 836         * Re-read the index as pre-commit hook could have updated it,
 837         * and write it out as a tree.  We must do this before we invoke
 838         * the editor and after we invoke run_status above.
 839         */
 840        discard_cache();
 841        read_cache_from(index_file);
 842        if (!active_cache_tree)
 843                active_cache_tree = cache_tree();
 844        if (cache_tree_update(active_cache_tree,
 845                              active_cache, active_nr, 0, 0) < 0) {
 846                error(_("Error building trees"));
 847                return 0;
 848        }
 849
 850        if (run_hook(index_file, "prepare-commit-msg",
 851                     git_path(commit_editmsg), hook_arg1, hook_arg2, NULL))
 852                return 0;
 853
 854        if (use_editor) {
 855                char index[PATH_MAX];
 856                const char *env[2] = { NULL };
 857                env[0] =  index;
 858                snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file);
 859                if (launch_editor(git_path(commit_editmsg), NULL, env)) {
 860                        fprintf(stderr,
 861                        _("Please supply the message using either -m or -F option.\n"));
 862                        exit(1);
 863                }
 864        }
 865
 866        if (!no_verify &&
 867            run_hook(index_file, "commit-msg", git_path(commit_editmsg), NULL)) {
 868                return 0;
 869        }
 870
 871        return 1;
 872}
 873
 874/*
 875 * Find out if the message in the strbuf contains only whitespace and
 876 * Signed-off-by lines.
 877 */
 878static int message_is_empty(struct strbuf *sb)
 879{
 880        struct strbuf tmpl = STRBUF_INIT;
 881        const char *nl;
 882        int eol, i, start = 0;
 883
 884        if (cleanup_mode == CLEANUP_NONE && sb->len)
 885                return 0;
 886
 887        /* See if the template is just a prefix of the message. */
 888        if (template_file && strbuf_read_file(&tmpl, template_file, 0) > 0) {
 889                stripspace(&tmpl, cleanup_mode == CLEANUP_ALL);
 890                if (start + tmpl.len <= sb->len &&
 891                    memcmp(tmpl.buf, sb->buf + start, tmpl.len) == 0)
 892                        start += tmpl.len;
 893        }
 894        strbuf_release(&tmpl);
 895
 896        /* Check if the rest is just whitespace and Signed-of-by's. */
 897        for (i = start; i < sb->len; i++) {
 898                nl = memchr(sb->buf + i, '\n', sb->len - i);
 899                if (nl)
 900                        eol = nl - sb->buf;
 901                else
 902                        eol = sb->len;
 903
 904                if (strlen(sign_off_header) <= eol - i &&
 905                    !prefixcmp(sb->buf + i, sign_off_header)) {
 906                        i = eol;
 907                        continue;
 908                }
 909                while (i < eol)
 910                        if (!isspace(sb->buf[i++]))
 911                                return 0;
 912        }
 913
 914        return 1;
 915}
 916
 917static const char *find_author_by_nickname(const char *name)
 918{
 919        struct rev_info revs;
 920        struct commit *commit;
 921        struct strbuf buf = STRBUF_INIT;
 922        const char *av[20];
 923        int ac = 0;
 924
 925        init_revisions(&revs, NULL);
 926        strbuf_addf(&buf, "--author=%s", name);
 927        av[++ac] = "--all";
 928        av[++ac] = "-i";
 929        av[++ac] = buf.buf;
 930        av[++ac] = NULL;
 931        setup_revisions(ac, av, &revs, NULL);
 932        prepare_revision_walk(&revs);
 933        commit = get_revision(&revs);
 934        if (commit) {
 935                struct pretty_print_context ctx = {0};
 936                ctx.date_mode = DATE_NORMAL;
 937                strbuf_release(&buf);
 938                format_commit_message(commit, "%an <%ae>", &buf, &ctx);
 939                return strbuf_detach(&buf, NULL);
 940        }
 941        die(_("No existing author found with '%s'"), name);
 942}
 943
 944
 945static void handle_untracked_files_arg(struct wt_status *s)
 946{
 947        if (!untracked_files_arg)
 948                ; /* default already initialized */
 949        else if (!strcmp(untracked_files_arg, "no"))
 950                s->show_untracked_files = SHOW_NO_UNTRACKED_FILES;
 951        else if (!strcmp(untracked_files_arg, "normal"))
 952                s->show_untracked_files = SHOW_NORMAL_UNTRACKED_FILES;
 953        else if (!strcmp(untracked_files_arg, "all"))
 954                s->show_untracked_files = SHOW_ALL_UNTRACKED_FILES;
 955        else
 956                die(_("Invalid untracked files mode '%s'"), untracked_files_arg);
 957}
 958
 959static const char *read_commit_message(const char *name)
 960{
 961        const char *out_enc, *out;
 962        struct commit *commit;
 963
 964        commit = lookup_commit_reference_by_name(name);
 965        if (!commit)
 966                die(_("could not lookup commit %s"), name);
 967        out_enc = get_commit_output_encoding();
 968        out = logmsg_reencode(commit, out_enc);
 969
 970        /*
 971         * If we failed to reencode the buffer, just copy it
 972         * byte for byte so the user can try to fix it up.
 973         * This also handles the case where input and output
 974         * encodings are identical.
 975         */
 976        if (out == NULL)
 977                out = xstrdup(commit->buffer);
 978        return out;
 979}
 980
 981static int parse_and_validate_options(int argc, const char *argv[],
 982                                      const char * const usage[],
 983                                      const char *prefix,
 984                                      struct wt_status *s)
 985{
 986        int f = 0;
 987
 988        argc = parse_options(argc, argv, prefix, builtin_commit_options, usage,
 989                             0);
 990
 991        if (force_author && !strchr(force_author, '>'))
 992                force_author = find_author_by_nickname(force_author);
 993
 994        if (force_author && renew_authorship)
 995                die(_("Using both --reset-author and --author does not make sense"));
 996
 997        if (logfile || message.len || use_message || fixup_message)
 998                use_editor = 0;
 999        if (edit_flag)
1000                use_editor = 1;
1001        if (!use_editor)
1002                setenv("GIT_EDITOR", ":", 1);
1003
1004        if (get_sha1("HEAD", head_sha1))
1005                initial_commit = 1;
1006
1007        /* Sanity check options */
1008        if (amend && initial_commit)
1009                die(_("You have nothing to amend."));
1010        if (amend && whence != FROM_COMMIT)
1011                die(_("You are in the middle of a %s -- cannot amend."), whence_s());
1012        if (fixup_message && squash_message)
1013                die(_("Options --squash and --fixup cannot be used together"));
1014        if (use_message)
1015                f++;
1016        if (edit_message)
1017                f++;
1018        if (fixup_message)
1019                f++;
1020        if (logfile)
1021                f++;
1022        if (f > 1)
1023                die(_("Only one of -c/-C/-F/--fixup can be used."));
1024        if (message.len && f > 0)
1025                die((_("Option -m cannot be combined with -c/-C/-F/--fixup.")));
1026        if (edit_message)
1027                use_message = edit_message;
1028        if (amend && !use_message && !fixup_message)
1029                use_message = "HEAD";
1030        if (!use_message && whence != FROM_CHERRY_PICK && renew_authorship)
1031                die(_("--reset-author can be used only with -C, -c or --amend."));
1032        if (use_message) {
1033                use_message_buffer = read_commit_message(use_message);
1034                if (!renew_authorship) {
1035                        author_message = use_message;
1036                        author_message_buffer = use_message_buffer;
1037                }
1038        }
1039        if (whence == FROM_CHERRY_PICK && !renew_authorship) {
1040                author_message = "CHERRY_PICK_HEAD";
1041                author_message_buffer = read_commit_message(author_message);
1042        }
1043
1044        if (!!also + !!only + !!all + !!interactive > 1)
1045                die(_("Only one of --include/--only/--all/--interactive can be used."));
1046        if (argc == 0 && (also || (only && !amend)))
1047                die(_("No paths with --include/--only does not make sense."));
1048        if (argc == 0 && only && amend)
1049                only_include_assumed = _("Clever... amending the last one with dirty index.");
1050        if (argc > 0 && !also && !only)
1051                only_include_assumed = _("Explicit paths specified without -i nor -o; assuming --only paths...");
1052        if (!cleanup_arg || !strcmp(cleanup_arg, "default"))
1053                cleanup_mode = use_editor ? CLEANUP_ALL : CLEANUP_SPACE;
1054        else if (!strcmp(cleanup_arg, "verbatim"))
1055                cleanup_mode = CLEANUP_NONE;
1056        else if (!strcmp(cleanup_arg, "whitespace"))
1057                cleanup_mode = CLEANUP_SPACE;
1058        else if (!strcmp(cleanup_arg, "strip"))
1059                cleanup_mode = CLEANUP_ALL;
1060        else
1061                die(_("Invalid cleanup mode %s"), cleanup_arg);
1062
1063        handle_untracked_files_arg(s);
1064
1065        if (all && argc > 0)
1066                die(_("Paths with -a does not make sense."));
1067        else if (interactive && argc > 0)
1068                die(_("Paths with --interactive does not make sense."));
1069
1070        if (null_termination && status_format == STATUS_FORMAT_LONG)
1071                status_format = STATUS_FORMAT_PORCELAIN;
1072        if (status_format != STATUS_FORMAT_LONG)
1073                dry_run = 1;
1074
1075        return argc;
1076}
1077
1078static int dry_run_commit(int argc, const char **argv, const char *prefix,
1079                          struct wt_status *s)
1080{
1081        int commitable;
1082        const char *index_file;
1083
1084        index_file = prepare_index(argc, argv, prefix, 1);
1085        commitable = run_status(stdout, index_file, prefix, 0, s);
1086        rollback_index_files();
1087
1088        return commitable ? 0 : 1;
1089}
1090
1091static int parse_status_slot(const char *var, int offset)
1092{
1093        if (!strcasecmp(var+offset, "header"))
1094                return WT_STATUS_HEADER;
1095        if (!strcasecmp(var+offset, "branch"))
1096                return WT_STATUS_ONBRANCH;
1097        if (!strcasecmp(var+offset, "updated")
1098                || !strcasecmp(var+offset, "added"))
1099                return WT_STATUS_UPDATED;
1100        if (!strcasecmp(var+offset, "changed"))
1101                return WT_STATUS_CHANGED;
1102        if (!strcasecmp(var+offset, "untracked"))
1103                return WT_STATUS_UNTRACKED;
1104        if (!strcasecmp(var+offset, "nobranch"))
1105                return WT_STATUS_NOBRANCH;
1106        if (!strcasecmp(var+offset, "unmerged"))
1107                return WT_STATUS_UNMERGED;
1108        return -1;
1109}
1110
1111static int git_status_config(const char *k, const char *v, void *cb)
1112{
1113        struct wt_status *s = cb;
1114
1115        if (!strcmp(k, "status.submodulesummary")) {
1116                int is_bool;
1117                s->submodule_summary = git_config_bool_or_int(k, v, &is_bool);
1118                if (is_bool && s->submodule_summary)
1119                        s->submodule_summary = -1;
1120                return 0;
1121        }
1122        if (!strcmp(k, "status.color") || !strcmp(k, "color.status")) {
1123                s->use_color = git_config_colorbool(k, v, -1);
1124                return 0;
1125        }
1126        if (!prefixcmp(k, "status.color.") || !prefixcmp(k, "color.status.")) {
1127                int slot = parse_status_slot(k, 13);
1128                if (slot < 0)
1129                        return 0;
1130                if (!v)
1131                        return config_error_nonbool(k);
1132                color_parse(v, k, s->color_palette[slot]);
1133                return 0;
1134        }
1135        if (!strcmp(k, "status.relativepaths")) {
1136                s->relative_paths = git_config_bool(k, v);
1137                return 0;
1138        }
1139        if (!strcmp(k, "status.showuntrackedfiles")) {
1140                if (!v)
1141                        return config_error_nonbool(k);
1142                else if (!strcmp(v, "no"))
1143                        s->show_untracked_files = SHOW_NO_UNTRACKED_FILES;
1144                else if (!strcmp(v, "normal"))
1145                        s->show_untracked_files = SHOW_NORMAL_UNTRACKED_FILES;
1146                else if (!strcmp(v, "all"))
1147                        s->show_untracked_files = SHOW_ALL_UNTRACKED_FILES;
1148                else
1149                        return error(_("Invalid untracked files mode '%s'"), v);
1150                return 0;
1151        }
1152        return git_diff_ui_config(k, v, NULL);
1153}
1154
1155int cmd_status(int argc, const char **argv, const char *prefix)
1156{
1157        struct wt_status s;
1158        int fd;
1159        unsigned char sha1[20];
1160        static struct option builtin_status_options[] = {
1161                OPT__VERBOSE(&verbose, "be verbose"),
1162                OPT_SET_INT('s', "short", &status_format,
1163                            "show status concisely", STATUS_FORMAT_SHORT),
1164                OPT_BOOLEAN('b', "branch", &status_show_branch,
1165                            "show branch information"),
1166                OPT_SET_INT(0, "porcelain", &status_format,
1167                            "machine-readable output",
1168                            STATUS_FORMAT_PORCELAIN),
1169                OPT_BOOLEAN('z', "null", &null_termination,
1170                            "terminate entries with NUL"),
1171                { OPTION_STRING, 'u', "untracked-files", &untracked_files_arg,
1172                  "mode",
1173                  "show untracked files, optional modes: all, normal, no. (Default: all)",
1174                  PARSE_OPT_OPTARG, NULL, (intptr_t)"all" },
1175                OPT_BOOLEAN(0, "ignored", &show_ignored_in_status,
1176                            "show ignored files"),
1177                { OPTION_STRING, 0, "ignore-submodules", &ignore_submodule_arg, "when",
1178                  "ignore changes to submodules, optional when: all, dirty, untracked. (Default: all)",
1179                  PARSE_OPT_OPTARG, NULL, (intptr_t)"all" },
1180                OPT_END(),
1181        };
1182
1183        if (argc == 2 && !strcmp(argv[1], "-h"))
1184                usage_with_options(builtin_status_usage, builtin_status_options);
1185
1186        if (null_termination && status_format == STATUS_FORMAT_LONG)
1187                status_format = STATUS_FORMAT_PORCELAIN;
1188
1189        wt_status_prepare(&s);
1190        gitmodules_config();
1191        git_config(git_status_config, &s);
1192        determine_whence(&s);
1193        argc = parse_options(argc, argv, prefix,
1194                             builtin_status_options,
1195                             builtin_status_usage, 0);
1196        handle_untracked_files_arg(&s);
1197        if (show_ignored_in_status)
1198                s.show_ignored_files = 1;
1199        if (*argv)
1200                s.pathspec = get_pathspec(prefix, argv);
1201
1202        read_cache_preload(s.pathspec);
1203        refresh_index(&the_index, REFRESH_QUIET|REFRESH_UNMERGED, s.pathspec, NULL, NULL);
1204
1205        fd = hold_locked_index(&index_lock, 0);
1206        if (0 <= fd)
1207                update_index_if_able(&the_index, &index_lock);
1208
1209        s.is_initial = get_sha1(s.reference, sha1) ? 1 : 0;
1210        s.ignore_submodule_arg = ignore_submodule_arg;
1211        wt_status_collect(&s);
1212
1213        if (s.relative_paths)
1214                s.prefix = prefix;
1215        if (s.use_color == -1)
1216                s.use_color = git_use_color_default;
1217        if (diff_use_color_default == -1)
1218                diff_use_color_default = git_use_color_default;
1219
1220        switch (status_format) {
1221        case STATUS_FORMAT_SHORT:
1222                wt_shortstatus_print(&s, null_termination, status_show_branch);
1223                break;
1224        case STATUS_FORMAT_PORCELAIN:
1225                wt_porcelain_print(&s, null_termination);
1226                break;
1227        case STATUS_FORMAT_LONG:
1228                s.verbose = verbose;
1229                s.ignore_submodule_arg = ignore_submodule_arg;
1230                wt_status_print(&s);
1231                break;
1232        }
1233        return 0;
1234}
1235
1236static void print_summary(const char *prefix, const unsigned char *sha1)
1237{
1238        struct rev_info rev;
1239        struct commit *commit;
1240        struct strbuf format = STRBUF_INIT;
1241        unsigned char junk_sha1[20];
1242        const char *head = resolve_ref("HEAD", junk_sha1, 0, NULL);
1243        struct pretty_print_context pctx = {0};
1244        struct strbuf author_ident = STRBUF_INIT;
1245        struct strbuf committer_ident = STRBUF_INIT;
1246
1247        commit = lookup_commit(sha1);
1248        if (!commit)
1249                die(_("couldn't look up newly created commit"));
1250        if (!commit || parse_commit(commit))
1251                die(_("could not parse newly created commit"));
1252
1253        strbuf_addstr(&format, "format:%h] %s");
1254
1255        format_commit_message(commit, "%an <%ae>", &author_ident, &pctx);
1256        format_commit_message(commit, "%cn <%ce>", &committer_ident, &pctx);
1257        if (strbuf_cmp(&author_ident, &committer_ident)) {
1258                strbuf_addstr(&format, "\n Author: ");
1259                strbuf_addbuf_percentquote(&format, &author_ident);
1260        }
1261        if (!user_ident_sufficiently_given()) {
1262                strbuf_addstr(&format, "\n Committer: ");
1263                strbuf_addbuf_percentquote(&format, &committer_ident);
1264                if (advice_implicit_identity) {
1265                        strbuf_addch(&format, '\n');
1266                        strbuf_addstr(&format, _(implicit_ident_advice));
1267                }
1268        }
1269        strbuf_release(&author_ident);
1270        strbuf_release(&committer_ident);
1271
1272        init_revisions(&rev, prefix);
1273        setup_revisions(0, NULL, &rev, NULL);
1274
1275        rev.diff = 1;
1276        rev.diffopt.output_format =
1277                DIFF_FORMAT_SHORTSTAT | DIFF_FORMAT_SUMMARY;
1278
1279        rev.verbose_header = 1;
1280        rev.show_root_diff = 1;
1281        get_commit_format(format.buf, &rev);
1282        rev.always_show_header = 0;
1283        rev.diffopt.detect_rename = 1;
1284        rev.diffopt.break_opt = 0;
1285        diff_setup_done(&rev.diffopt);
1286
1287        printf("[%s%s ",
1288                !prefixcmp(head, "refs/heads/") ?
1289                        head + 11 :
1290                        !strcmp(head, "HEAD") ?
1291                                _("detached HEAD") :
1292                                head,
1293                initial_commit ? _(" (root-commit)") : "");
1294
1295        if (!log_tree_commit(&rev, commit)) {
1296                rev.always_show_header = 1;
1297                rev.use_terminator = 1;
1298                log_tree_commit(&rev, commit);
1299        }
1300
1301        strbuf_release(&format);
1302}
1303
1304static int git_commit_config(const char *k, const char *v, void *cb)
1305{
1306        struct wt_status *s = cb;
1307
1308        if (!strcmp(k, "commit.template"))
1309                return git_config_pathname(&template_file, k, v);
1310        if (!strcmp(k, "commit.status")) {
1311                include_status = git_config_bool(k, v);
1312                return 0;
1313        }
1314
1315        return git_status_config(k, v, s);
1316}
1317
1318static const char post_rewrite_hook[] = "hooks/post-rewrite";
1319
1320static int run_rewrite_hook(const unsigned char *oldsha1,
1321                            const unsigned char *newsha1)
1322{
1323        /* oldsha1 SP newsha1 LF NUL */
1324        static char buf[2*40 + 3];
1325        struct child_process proc;
1326        const char *argv[3];
1327        int code;
1328        size_t n;
1329
1330        if (access(git_path(post_rewrite_hook), X_OK) < 0)
1331                return 0;
1332
1333        argv[0] = git_path(post_rewrite_hook);
1334        argv[1] = "amend";
1335        argv[2] = NULL;
1336
1337        memset(&proc, 0, sizeof(proc));
1338        proc.argv = argv;
1339        proc.in = -1;
1340        proc.stdout_to_stderr = 1;
1341
1342        code = start_command(&proc);
1343        if (code)
1344                return code;
1345        n = snprintf(buf, sizeof(buf), "%s %s\n",
1346                     sha1_to_hex(oldsha1), sha1_to_hex(newsha1));
1347        write_in_full(proc.in, buf, n);
1348        close(proc.in);
1349        return finish_command(&proc);
1350}
1351
1352int cmd_commit(int argc, const char **argv, const char *prefix)
1353{
1354        struct strbuf sb = STRBUF_INIT;
1355        struct strbuf author_ident = STRBUF_INIT;
1356        const char *index_file, *reflog_msg;
1357        char *nl, *p;
1358        unsigned char commit_sha1[20];
1359        struct ref_lock *ref_lock;
1360        struct commit_list *parents = NULL, **pptr = &parents;
1361        struct stat statbuf;
1362        int allow_fast_forward = 1;
1363        struct wt_status s;
1364
1365        if (argc == 2 && !strcmp(argv[1], "-h"))
1366                usage_with_options(builtin_commit_usage, builtin_commit_options);
1367
1368        wt_status_prepare(&s);
1369        git_config(git_commit_config, &s);
1370        determine_whence(&s);
1371
1372        if (s.use_color == -1)
1373                s.use_color = git_use_color_default;
1374        argc = parse_and_validate_options(argc, argv, builtin_commit_usage,
1375                                          prefix, &s);
1376        if (dry_run) {
1377                if (diff_use_color_default == -1)
1378                        diff_use_color_default = git_use_color_default;
1379                return dry_run_commit(argc, argv, prefix, &s);
1380        }
1381        index_file = prepare_index(argc, argv, prefix, 0);
1382
1383        /* Set up everything for writing the commit object.  This includes
1384           running hooks, writing the trees, and interacting with the user.  */
1385        if (!prepare_to_commit(index_file, prefix, &s, &author_ident)) {
1386                rollback_index_files();
1387                return 1;
1388        }
1389
1390        /* Determine parents */
1391        reflog_msg = getenv("GIT_REFLOG_ACTION");
1392        if (initial_commit) {
1393                if (!reflog_msg)
1394                        reflog_msg = "commit (initial)";
1395        } else if (amend) {
1396                struct commit_list *c;
1397                struct commit *commit;
1398
1399                if (!reflog_msg)
1400                        reflog_msg = "commit (amend)";
1401                commit = lookup_commit(head_sha1);
1402                if (!commit || parse_commit(commit))
1403                        die(_("could not parse HEAD commit"));
1404
1405                for (c = commit->parents; c; c = c->next)
1406                        pptr = &commit_list_insert(c->item, pptr)->next;
1407        } else if (whence == FROM_MERGE) {
1408                struct strbuf m = STRBUF_INIT;
1409                FILE *fp;
1410
1411                if (!reflog_msg)
1412                        reflog_msg = "commit (merge)";
1413                pptr = &commit_list_insert(lookup_commit(head_sha1), pptr)->next;
1414                fp = fopen(git_path("MERGE_HEAD"), "r");
1415                if (fp == NULL)
1416                        die_errno(_("could not open '%s' for reading"),
1417                                  git_path("MERGE_HEAD"));
1418                while (strbuf_getline(&m, fp, '\n') != EOF) {
1419                        unsigned char sha1[20];
1420                        if (get_sha1_hex(m.buf, sha1) < 0)
1421                                die(_("Corrupt MERGE_HEAD file (%s)"), m.buf);
1422                        pptr = &commit_list_insert(lookup_commit(sha1), pptr)->next;
1423                }
1424                fclose(fp);
1425                strbuf_release(&m);
1426                if (!stat(git_path("MERGE_MODE"), &statbuf)) {
1427                        if (strbuf_read_file(&sb, git_path("MERGE_MODE"), 0) < 0)
1428                                die_errno(_("could not read MERGE_MODE"));
1429                        if (!strcmp(sb.buf, "no-ff"))
1430                                allow_fast_forward = 0;
1431                }
1432                if (allow_fast_forward)
1433                        parents = reduce_heads(parents);
1434        } else {
1435                if (!reflog_msg)
1436                        reflog_msg = (whence == FROM_CHERRY_PICK)
1437                                        ? "commit (cherry-pick)"
1438                                        : "commit";
1439                pptr = &commit_list_insert(lookup_commit(head_sha1), pptr)->next;
1440        }
1441
1442        /* Finally, get the commit message */
1443        strbuf_reset(&sb);
1444        if (strbuf_read_file(&sb, git_path(commit_editmsg), 0) < 0) {
1445                int saved_errno = errno;
1446                rollback_index_files();
1447                die(_("could not read commit message: %s"), strerror(saved_errno));
1448        }
1449
1450        /* Truncate the message just before the diff, if any. */
1451        if (verbose) {
1452                p = strstr(sb.buf, "\ndiff --git ");
1453                if (p != NULL)
1454                        strbuf_setlen(&sb, p - sb.buf + 1);
1455        }
1456
1457        if (cleanup_mode != CLEANUP_NONE)
1458                stripspace(&sb, cleanup_mode == CLEANUP_ALL);
1459        if (message_is_empty(&sb) && !allow_empty_message) {
1460                rollback_index_files();
1461                fprintf(stderr, _("Aborting commit due to empty commit message.\n"));
1462                exit(1);
1463        }
1464
1465        if (commit_tree(sb.buf, active_cache_tree->sha1, parents, commit_sha1,
1466                        author_ident.buf)) {
1467                rollback_index_files();
1468                die(_("failed to write commit object"));
1469        }
1470        strbuf_release(&author_ident);
1471
1472        ref_lock = lock_any_ref_for_update("HEAD",
1473                                           initial_commit ? NULL : head_sha1,
1474                                           0);
1475
1476        nl = strchr(sb.buf, '\n');
1477        if (nl)
1478                strbuf_setlen(&sb, nl + 1 - sb.buf);
1479        else
1480                strbuf_addch(&sb, '\n');
1481        strbuf_insert(&sb, 0, reflog_msg, strlen(reflog_msg));
1482        strbuf_insert(&sb, strlen(reflog_msg), ": ", 2);
1483
1484        if (!ref_lock) {
1485                rollback_index_files();
1486                die(_("cannot lock HEAD ref"));
1487        }
1488        if (write_ref_sha1(ref_lock, commit_sha1, sb.buf) < 0) {
1489                rollback_index_files();
1490                die(_("cannot update HEAD ref"));
1491        }
1492
1493        unlink(git_path("CHERRY_PICK_HEAD"));
1494        unlink(git_path("MERGE_HEAD"));
1495        unlink(git_path("MERGE_MSG"));
1496        unlink(git_path("MERGE_MODE"));
1497        unlink(git_path("SQUASH_MSG"));
1498
1499        if (commit_index_files())
1500                die (_("Repository has been updated, but unable to write\n"
1501                     "new_index file. Check that disk is not full or quota is\n"
1502                     "not exceeded, and then \"git reset HEAD\" to recover."));
1503
1504        rerere(0);
1505        run_hook(get_index_file(), "post-commit", NULL);
1506        if (amend && !no_post_rewrite) {
1507                struct notes_rewrite_cfg *cfg;
1508                cfg = init_copy_notes_for_rewrite("amend");
1509                if (cfg) {
1510                        copy_note_for_rewrite(cfg, head_sha1, commit_sha1);
1511                        finish_copy_notes_for_rewrite(cfg);
1512                }
1513                run_rewrite_hook(head_sha1, commit_sha1);
1514        }
1515        if (!quiet)
1516                print_summary(prefix, commit_sha1);
1517
1518        return 0;
1519}