builtin-commit.con commit Merge branch 'maint-1.6.0' into maint-1.6.1 (ff6e93f)
   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
  28static const char * const builtin_commit_usage[] = {
  29        "git commit [options] [--] <filepattern>...",
  30        NULL
  31};
  32
  33static const char * const builtin_status_usage[] = {
  34        "git status [options] [--] <filepattern>...",
  35        NULL
  36};
  37
  38static unsigned char head_sha1[20], merge_head_sha1[20];
  39static char *use_message_buffer;
  40static const char commit_editmsg[] = "COMMIT_EDITMSG";
  41static struct lock_file index_lock; /* real index */
  42static struct lock_file false_lock; /* used only for partial commits */
  43static enum {
  44        COMMIT_AS_IS = 1,
  45        COMMIT_NORMAL,
  46        COMMIT_PARTIAL,
  47} commit_style;
  48
  49static const char *logfile, *force_author;
  50static const char *template_file;
  51static char *edit_message, *use_message;
  52static char *author_name, *author_email, *author_date;
  53static int all, edit_flag, also, interactive, only, amend, signoff;
  54static int quiet, verbose, no_verify, allow_empty;
  55static char *untracked_files_arg;
  56/*
  57 * The default commit message cleanup mode will remove the lines
  58 * beginning with # (shell comments) and leading and trailing
  59 * whitespaces (empty lines or containing only whitespaces)
  60 * if editor is used, and only the whitespaces if the message
  61 * is specified explicitly.
  62 */
  63static enum {
  64        CLEANUP_SPACE,
  65        CLEANUP_NONE,
  66        CLEANUP_ALL,
  67} cleanup_mode;
  68static char *cleanup_arg;
  69
  70static int use_editor = 1, initial_commit, in_merge;
  71static const char *only_include_assumed;
  72static struct strbuf message;
  73
  74static int opt_parse_m(const struct option *opt, const char *arg, int unset)
  75{
  76        struct strbuf *buf = opt->value;
  77        if (unset)
  78                strbuf_setlen(buf, 0);
  79        else {
  80                strbuf_addstr(buf, arg);
  81                strbuf_addstr(buf, "\n\n");
  82        }
  83        return 0;
  84}
  85
  86static struct option builtin_commit_options[] = {
  87        OPT__QUIET(&quiet),
  88        OPT__VERBOSE(&verbose),
  89        OPT_GROUP("Commit message options"),
  90
  91        OPT_STRING('F', "file", &logfile, "FILE", "read log from file"),
  92        OPT_STRING(0, "author", &force_author, "AUTHOR", "override author for commit"),
  93        OPT_CALLBACK('m', "message", &message, "MESSAGE", "specify commit message", opt_parse_m),
  94        OPT_STRING('c', "reedit-message", &edit_message, "COMMIT", "reuse and edit message from specified commit "),
  95        OPT_STRING('C', "reuse-message", &use_message, "COMMIT", "reuse message from specified commit"),
  96        OPT_BOOLEAN('s', "signoff", &signoff, "add Signed-off-by:"),
  97        OPT_STRING('t', "template", &template_file, "FILE", "use specified template file"),
  98        OPT_BOOLEAN('e', "edit", &edit_flag, "force edit of commit"),
  99
 100        OPT_GROUP("Commit contents options"),
 101        OPT_BOOLEAN('a', "all", &all, "commit all changed files"),
 102        OPT_BOOLEAN('i', "include", &also, "add specified files to index for commit"),
 103        OPT_BOOLEAN(0, "interactive", &interactive, "interactively add files"),
 104        OPT_BOOLEAN('o', "only", &only, "commit only specified files"),
 105        OPT_BOOLEAN('n', "no-verify", &no_verify, "bypass pre-commit hook"),
 106        OPT_BOOLEAN(0, "amend", &amend, "amend previous commit"),
 107        { 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" },
 108        OPT_BOOLEAN(0, "allow-empty", &allow_empty, "ok to record an empty change"),
 109        OPT_STRING(0, "cleanup", &cleanup_arg, "default", "how to strip spaces and #comments from message"),
 110
 111        OPT_END()
 112};
 113
 114static void rollback_index_files(void)
 115{
 116        switch (commit_style) {
 117        case COMMIT_AS_IS:
 118                break; /* nothing to do */
 119        case COMMIT_NORMAL:
 120                rollback_lock_file(&index_lock);
 121                break;
 122        case COMMIT_PARTIAL:
 123                rollback_lock_file(&index_lock);
 124                rollback_lock_file(&false_lock);
 125                break;
 126        }
 127}
 128
 129static int commit_index_files(void)
 130{
 131        int err = 0;
 132
 133        switch (commit_style) {
 134        case COMMIT_AS_IS:
 135                break; /* nothing to do */
 136        case COMMIT_NORMAL:
 137                err = commit_lock_file(&index_lock);
 138                break;
 139        case COMMIT_PARTIAL:
 140                err = commit_lock_file(&index_lock);
 141                rollback_lock_file(&false_lock);
 142                break;
 143        }
 144
 145        return err;
 146}
 147
 148/*
 149 * Take a union of paths in the index and the named tree (typically, "HEAD"),
 150 * and return the paths that match the given pattern in list.
 151 */
 152static int list_paths(struct string_list *list, const char *with_tree,
 153                      const char *prefix, const char **pattern)
 154{
 155        int i;
 156        char *m;
 157
 158        for (i = 0; pattern[i]; i++)
 159                ;
 160        m = xcalloc(1, i);
 161
 162        if (with_tree)
 163                overlay_tree_on_cache(with_tree, prefix);
 164
 165        for (i = 0; i < active_nr; i++) {
 166                struct cache_entry *ce = active_cache[i];
 167                if (ce->ce_flags & CE_UPDATE)
 168                        continue;
 169                if (!pathspec_match(pattern, m, ce->name, 0))
 170                        continue;
 171                string_list_insert(ce->name, list);
 172        }
 173
 174        return report_path_error(m, pattern, prefix ? strlen(prefix) : 0);
 175}
 176
 177static void add_remove_files(struct string_list *list)
 178{
 179        int i;
 180        for (i = 0; i < list->nr; i++) {
 181                struct stat st;
 182                struct string_list_item *p = &(list->items[i]);
 183
 184                if (!lstat(p->string, &st)) {
 185                        if (add_to_cache(p->string, &st, 0))
 186                                die("updating files failed");
 187                } else
 188                        remove_file_from_cache(p->string);
 189        }
 190}
 191
 192static void create_base_index(void)
 193{
 194        struct tree *tree;
 195        struct unpack_trees_options opts;
 196        struct tree_desc t;
 197
 198        if (initial_commit) {
 199                discard_cache();
 200                return;
 201        }
 202
 203        memset(&opts, 0, sizeof(opts));
 204        opts.head_idx = 1;
 205        opts.index_only = 1;
 206        opts.merge = 1;
 207        opts.src_index = &the_index;
 208        opts.dst_index = &the_index;
 209
 210        opts.fn = oneway_merge;
 211        tree = parse_tree_indirect(head_sha1);
 212        if (!tree)
 213                die("failed to unpack HEAD tree object");
 214        parse_tree(tree);
 215        init_tree_desc(&t, tree->buffer, tree->size);
 216        if (unpack_trees(1, &t, &opts))
 217                exit(128); /* We've already reported the error, finish dying */
 218}
 219
 220static char *prepare_index(int argc, const char **argv, const char *prefix)
 221{
 222        int fd;
 223        struct string_list partial;
 224        const char **pathspec = NULL;
 225
 226        if (interactive) {
 227                if (interactive_add(argc, argv, prefix) != 0)
 228                        die("interactive add failed");
 229                if (read_cache_preload(NULL) < 0)
 230                        die("index file corrupt");
 231                commit_style = COMMIT_AS_IS;
 232                return get_index_file();
 233        }
 234
 235        if (*argv)
 236                pathspec = get_pathspec(prefix, argv);
 237
 238        if (read_cache_preload(pathspec) < 0)
 239                die("index file corrupt");
 240
 241        /*
 242         * Non partial, non as-is commit.
 243         *
 244         * (1) get the real index;
 245         * (2) update the_index as necessary;
 246         * (3) write the_index out to the real index (still locked);
 247         * (4) return the name of the locked index file.
 248         *
 249         * The caller should run hooks on the locked real index, and
 250         * (A) if all goes well, commit the real index;
 251         * (B) on failure, rollback the real index.
 252         */
 253        if (all || (also && pathspec && *pathspec)) {
 254                int fd = hold_locked_index(&index_lock, 1);
 255                add_files_to_cache(also ? prefix : NULL, pathspec, 0);
 256                refresh_cache(REFRESH_QUIET);
 257                if (write_cache(fd, active_cache, active_nr) ||
 258                    close_lock_file(&index_lock))
 259                        die("unable to write new_index file");
 260                commit_style = COMMIT_NORMAL;
 261                return index_lock.filename;
 262        }
 263
 264        /*
 265         * As-is commit.
 266         *
 267         * (1) return the name of the real index file.
 268         *
 269         * The caller should run hooks on the real index, and run
 270         * hooks on the real index, and create commit from the_index.
 271         * We still need to refresh the index here.
 272         */
 273        if (!pathspec || !*pathspec) {
 274                fd = hold_locked_index(&index_lock, 1);
 275                refresh_cache(REFRESH_QUIET);
 276                if (write_cache(fd, active_cache, active_nr) ||
 277                    commit_locked_index(&index_lock))
 278                        die("unable to write new_index file");
 279                commit_style = COMMIT_AS_IS;
 280                return get_index_file();
 281        }
 282
 283        /*
 284         * A partial commit.
 285         *
 286         * (0) find the set of affected paths;
 287         * (1) get lock on the real index file;
 288         * (2) update the_index with the given paths;
 289         * (3) write the_index out to the real index (still locked);
 290         * (4) get lock on the false index file;
 291         * (5) reset the_index from HEAD;
 292         * (6) update the_index the same way as (2);
 293         * (7) write the_index out to the false index file;
 294         * (8) return the name of the false index file (still locked);
 295         *
 296         * The caller should run hooks on the locked false index, and
 297         * create commit from it.  Then
 298         * (A) if all goes well, commit the real index;
 299         * (B) on failure, rollback the real index;
 300         * In either case, rollback the false index.
 301         */
 302        commit_style = COMMIT_PARTIAL;
 303
 304        if (file_exists(git_path("MERGE_HEAD")))
 305                die("cannot do a partial commit during a merge.");
 306
 307        memset(&partial, 0, sizeof(partial));
 308        partial.strdup_strings = 1;
 309        if (list_paths(&partial, initial_commit ? NULL : "HEAD", prefix, pathspec))
 310                exit(1);
 311
 312        discard_cache();
 313        if (read_cache() < 0)
 314                die("cannot read the index");
 315
 316        fd = hold_locked_index(&index_lock, 1);
 317        add_remove_files(&partial);
 318        refresh_cache(REFRESH_QUIET);
 319        if (write_cache(fd, active_cache, active_nr) ||
 320            close_lock_file(&index_lock))
 321                die("unable to write new_index file");
 322
 323        fd = hold_lock_file_for_update(&false_lock,
 324                                       git_path("next-index-%"PRIuMAX,
 325                                                (uintmax_t) getpid()),
 326                                       LOCK_DIE_ON_ERROR);
 327
 328        create_base_index();
 329        add_remove_files(&partial);
 330        refresh_cache(REFRESH_QUIET);
 331
 332        if (write_cache(fd, active_cache, active_nr) ||
 333            close_lock_file(&false_lock))
 334                die("unable to write temporary index file");
 335
 336        discard_cache();
 337        read_cache_from(false_lock.filename);
 338
 339        return false_lock.filename;
 340}
 341
 342static int run_status(FILE *fp, const char *index_file, const char *prefix, int nowarn)
 343{
 344        struct wt_status s;
 345
 346        wt_status_prepare(&s);
 347        if (wt_status_relative_paths)
 348                s.prefix = prefix;
 349
 350        if (amend) {
 351                s.amend = 1;
 352                s.reference = "HEAD^1";
 353        }
 354        s.verbose = verbose;
 355        s.untracked = (show_untracked_files == SHOW_ALL_UNTRACKED_FILES);
 356        s.index_file = index_file;
 357        s.fp = fp;
 358        s.nowarn = nowarn;
 359
 360        wt_status_print(&s);
 361
 362        return s.commitable;
 363}
 364
 365static int run_hook(const char *index_file, const char *name, ...)
 366{
 367        struct child_process hook;
 368        const char *argv[10], *env[2];
 369        char index[PATH_MAX];
 370        va_list args;
 371        int i;
 372
 373        va_start(args, name);
 374        argv[0] = git_path("hooks/%s", name);
 375        i = 0;
 376        do {
 377                if (++i >= ARRAY_SIZE(argv))
 378                        die ("run_hook(): too many arguments");
 379                argv[i] = va_arg(args, const char *);
 380        } while (argv[i]);
 381        va_end(args);
 382
 383        snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file);
 384        env[0] = index;
 385        env[1] = NULL;
 386
 387        if (access(argv[0], X_OK) < 0)
 388                return 0;
 389
 390        memset(&hook, 0, sizeof(hook));
 391        hook.argv = argv;
 392        hook.no_stdin = 1;
 393        hook.stdout_to_stderr = 1;
 394        hook.env = env;
 395
 396        return run_command(&hook);
 397}
 398
 399static int is_a_merge(const unsigned char *sha1)
 400{
 401        struct commit *commit = lookup_commit(sha1);
 402        if (!commit || parse_commit(commit))
 403                die("could not parse HEAD commit");
 404        return !!(commit->parents && commit->parents->next);
 405}
 406
 407static const char sign_off_header[] = "Signed-off-by: ";
 408
 409static void determine_author_info(void)
 410{
 411        char *name, *email, *date;
 412
 413        name = getenv("GIT_AUTHOR_NAME");
 414        email = getenv("GIT_AUTHOR_EMAIL");
 415        date = getenv("GIT_AUTHOR_DATE");
 416
 417        if (use_message) {
 418                const char *a, *lb, *rb, *eol;
 419
 420                a = strstr(use_message_buffer, "\nauthor ");
 421                if (!a)
 422                        die("invalid commit: %s", use_message);
 423
 424                lb = strstr(a + 8, " <");
 425                rb = strstr(a + 8, "> ");
 426                eol = strchr(a + 8, '\n');
 427                if (!lb || !rb || !eol)
 428                        die("invalid commit: %s", use_message);
 429
 430                name = xstrndup(a + 8, lb - (a + 8));
 431                email = xstrndup(lb + 2, rb - (lb + 2));
 432                date = xstrndup(rb + 2, eol - (rb + 2));
 433        }
 434
 435        if (force_author) {
 436                const char *lb = strstr(force_author, " <");
 437                const char *rb = strchr(force_author, '>');
 438
 439                if (!lb || !rb)
 440                        die("malformed --author parameter");
 441                name = xstrndup(force_author, lb - force_author);
 442                email = xstrndup(lb + 2, rb - (lb + 2));
 443        }
 444
 445        author_name = name;
 446        author_email = email;
 447        author_date = date;
 448}
 449
 450static int prepare_to_commit(const char *index_file, const char *prefix)
 451{
 452        struct stat statbuf;
 453        int commitable, saved_color_setting;
 454        struct strbuf sb = STRBUF_INIT;
 455        char *buffer;
 456        FILE *fp;
 457        const char *hook_arg1 = NULL;
 458        const char *hook_arg2 = NULL;
 459        int ident_shown = 0;
 460
 461        if (!no_verify && run_hook(index_file, "pre-commit", NULL))
 462                return 0;
 463
 464        if (message.len) {
 465                strbuf_addbuf(&sb, &message);
 466                hook_arg1 = "message";
 467        } else if (logfile && !strcmp(logfile, "-")) {
 468                if (isatty(0))
 469                        fprintf(stderr, "(reading log message from standard input)\n");
 470                if (strbuf_read(&sb, 0, 0) < 0)
 471                        die("could not read log from standard input");
 472                hook_arg1 = "message";
 473        } else if (logfile) {
 474                if (strbuf_read_file(&sb, logfile, 0) < 0)
 475                        die("could not read log file '%s': %s",
 476                            logfile, strerror(errno));
 477                hook_arg1 = "message";
 478        } else if (use_message) {
 479                buffer = strstr(use_message_buffer, "\n\n");
 480                if (!buffer || buffer[2] == '\0')
 481                        die("commit has empty message");
 482                strbuf_add(&sb, buffer + 2, strlen(buffer + 2));
 483                hook_arg1 = "commit";
 484                hook_arg2 = use_message;
 485        } else if (!stat(git_path("MERGE_MSG"), &statbuf)) {
 486                if (strbuf_read_file(&sb, git_path("MERGE_MSG"), 0) < 0)
 487                        die("could not read MERGE_MSG: %s", strerror(errno));
 488                hook_arg1 = "merge";
 489        } else if (!stat(git_path("SQUASH_MSG"), &statbuf)) {
 490                if (strbuf_read_file(&sb, git_path("SQUASH_MSG"), 0) < 0)
 491                        die("could not read SQUASH_MSG: %s", strerror(errno));
 492                hook_arg1 = "squash";
 493        } else if (template_file && !stat(template_file, &statbuf)) {
 494                if (strbuf_read_file(&sb, template_file, 0) < 0)
 495                        die("could not read %s: %s",
 496                            template_file, strerror(errno));
 497                hook_arg1 = "template";
 498        }
 499
 500        /*
 501         * This final case does not modify the template message,
 502         * it just sets the argument to the prepare-commit-msg hook.
 503         */
 504        else if (in_merge)
 505                hook_arg1 = "merge";
 506
 507        fp = fopen(git_path(commit_editmsg), "w");
 508        if (fp == NULL)
 509                die("could not open %s: %s",
 510                    git_path(commit_editmsg), strerror(errno));
 511
 512        if (cleanup_mode != CLEANUP_NONE)
 513                stripspace(&sb, 0);
 514
 515        if (signoff) {
 516                struct strbuf sob = STRBUF_INIT;
 517                int i;
 518
 519                strbuf_addstr(&sob, sign_off_header);
 520                strbuf_addstr(&sob, fmt_name(getenv("GIT_COMMITTER_NAME"),
 521                                             getenv("GIT_COMMITTER_EMAIL")));
 522                strbuf_addch(&sob, '\n');
 523                for (i = sb.len - 1; i > 0 && sb.buf[i - 1] != '\n'; i--)
 524                        ; /* do nothing */
 525                if (prefixcmp(sb.buf + i, sob.buf)) {
 526                        if (prefixcmp(sb.buf + i, sign_off_header))
 527                                strbuf_addch(&sb, '\n');
 528                        strbuf_addbuf(&sb, &sob);
 529                }
 530                strbuf_release(&sob);
 531        }
 532
 533        if (fwrite(sb.buf, 1, sb.len, fp) < sb.len)
 534                die("could not write commit template: %s", strerror(errno));
 535
 536        strbuf_release(&sb);
 537
 538        determine_author_info();
 539
 540        /* This checks if committer ident is explicitly given */
 541        git_committer_info(0);
 542        if (use_editor) {
 543                char *author_ident;
 544                const char *committer_ident;
 545
 546                if (in_merge)
 547                        fprintf(fp,
 548                                "#\n"
 549                                "# It looks like you may be committing a MERGE.\n"
 550                                "# If this is not correct, please remove the file\n"
 551                                "#      %s\n"
 552                                "# and try again.\n"
 553                                "#\n",
 554                                git_path("MERGE_HEAD"));
 555
 556                fprintf(fp,
 557                        "\n"
 558                        "# Please enter the commit message for your changes.");
 559                if (cleanup_mode == CLEANUP_ALL)
 560                        fprintf(fp,
 561                                " Lines starting\n"
 562                                "# with '#' will be ignored, and an empty"
 563                                " message aborts the commit.\n");
 564                else /* CLEANUP_SPACE, that is. */
 565                        fprintf(fp,
 566                                " Lines starting\n"
 567                                "# with '#' will be kept; you may remove them"
 568                                " yourself if you want to.\n"
 569                                "# An empty message aborts the commit.\n");
 570                if (only_include_assumed)
 571                        fprintf(fp, "# %s\n", only_include_assumed);
 572
 573                author_ident = xstrdup(fmt_name(author_name, author_email));
 574                committer_ident = fmt_name(getenv("GIT_COMMITTER_NAME"),
 575                                           getenv("GIT_COMMITTER_EMAIL"));
 576                if (strcmp(author_ident, committer_ident))
 577                        fprintf(fp,
 578                                "%s"
 579                                "# Author:    %s\n",
 580                                ident_shown++ ? "" : "#\n",
 581                                author_ident);
 582                free(author_ident);
 583
 584                if (!user_ident_explicitly_given)
 585                        fprintf(fp,
 586                                "%s"
 587                                "# Committer: %s\n",
 588                                ident_shown++ ? "" : "#\n",
 589                                committer_ident);
 590
 591                if (ident_shown)
 592                        fprintf(fp, "#\n");
 593
 594                saved_color_setting = wt_status_use_color;
 595                wt_status_use_color = 0;
 596                commitable = run_status(fp, index_file, prefix, 1);
 597                wt_status_use_color = saved_color_setting;
 598        } else {
 599                struct rev_info rev;
 600                unsigned char sha1[20];
 601                const char *parent = "HEAD";
 602
 603                if (!active_nr && read_cache() < 0)
 604                        die("Cannot read index");
 605
 606                if (amend)
 607                        parent = "HEAD^1";
 608
 609                if (get_sha1(parent, sha1))
 610                        commitable = !!active_nr;
 611                else {
 612                        init_revisions(&rev, "");
 613                        rev.abbrev = 0;
 614                        setup_revisions(0, NULL, &rev, parent);
 615                        DIFF_OPT_SET(&rev.diffopt, QUIET);
 616                        DIFF_OPT_SET(&rev.diffopt, EXIT_WITH_STATUS);
 617                        run_diff_index(&rev, 1 /* cached */);
 618
 619                        commitable = !!DIFF_OPT_TST(&rev.diffopt, HAS_CHANGES);
 620                }
 621        }
 622
 623        fclose(fp);
 624
 625        if (!commitable && !in_merge && !allow_empty &&
 626            !(amend && is_a_merge(head_sha1))) {
 627                run_status(stdout, index_file, prefix, 0);
 628                return 0;
 629        }
 630
 631        /*
 632         * Re-read the index as pre-commit hook could have updated it,
 633         * and write it out as a tree.  We must do this before we invoke
 634         * the editor and after we invoke run_status above.
 635         */
 636        discard_cache();
 637        read_cache_from(index_file);
 638        if (!active_cache_tree)
 639                active_cache_tree = cache_tree();
 640        if (cache_tree_update(active_cache_tree,
 641                              active_cache, active_nr, 0, 0) < 0) {
 642                error("Error building trees");
 643                return 0;
 644        }
 645
 646        if (run_hook(index_file, "prepare-commit-msg",
 647                     git_path(commit_editmsg), hook_arg1, hook_arg2, NULL))
 648                return 0;
 649
 650        if (use_editor) {
 651                char index[PATH_MAX];
 652                const char *env[2] = { index, NULL };
 653                snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file);
 654                if (launch_editor(git_path(commit_editmsg), NULL, env)) {
 655                        fprintf(stderr,
 656                        "Please supply the message using either -m or -F option.\n");
 657                        exit(1);
 658                }
 659        }
 660
 661        if (!no_verify &&
 662            run_hook(index_file, "commit-msg", git_path(commit_editmsg), NULL)) {
 663                return 0;
 664        }
 665
 666        return 1;
 667}
 668
 669/*
 670 * Find out if the message in the strbuf contains only whitespace and
 671 * Signed-off-by lines.
 672 */
 673static int message_is_empty(struct strbuf *sb)
 674{
 675        struct strbuf tmpl = STRBUF_INIT;
 676        const char *nl;
 677        int eol, i, start = 0;
 678
 679        if (cleanup_mode == CLEANUP_NONE && sb->len)
 680                return 0;
 681
 682        /* See if the template is just a prefix of the message. */
 683        if (template_file && strbuf_read_file(&tmpl, template_file, 0) > 0) {
 684                stripspace(&tmpl, cleanup_mode == CLEANUP_ALL);
 685                if (start + tmpl.len <= sb->len &&
 686                    memcmp(tmpl.buf, sb->buf + start, tmpl.len) == 0)
 687                        start += tmpl.len;
 688        }
 689        strbuf_release(&tmpl);
 690
 691        /* Check if the rest is just whitespace and Signed-of-by's. */
 692        for (i = start; i < sb->len; i++) {
 693                nl = memchr(sb->buf + i, '\n', sb->len - i);
 694                if (nl)
 695                        eol = nl - sb->buf;
 696                else
 697                        eol = sb->len;
 698
 699                if (strlen(sign_off_header) <= eol - i &&
 700                    !prefixcmp(sb->buf + i, sign_off_header)) {
 701                        i = eol;
 702                        continue;
 703                }
 704                while (i < eol)
 705                        if (!isspace(sb->buf[i++]))
 706                                return 0;
 707        }
 708
 709        return 1;
 710}
 711
 712static const char *find_author_by_nickname(const char *name)
 713{
 714        struct rev_info revs;
 715        struct commit *commit;
 716        struct strbuf buf = STRBUF_INIT;
 717        const char *av[20];
 718        int ac = 0;
 719
 720        init_revisions(&revs, NULL);
 721        strbuf_addf(&buf, "--author=%s", name);
 722        av[++ac] = "--all";
 723        av[++ac] = "-i";
 724        av[++ac] = buf.buf;
 725        av[++ac] = NULL;
 726        setup_revisions(ac, av, &revs, NULL);
 727        prepare_revision_walk(&revs);
 728        commit = get_revision(&revs);
 729        if (commit) {
 730                strbuf_release(&buf);
 731                format_commit_message(commit, "%an <%ae>", &buf, DATE_NORMAL);
 732                return strbuf_detach(&buf, NULL);
 733        }
 734        die("No existing author found with '%s'", name);
 735}
 736
 737static int parse_and_validate_options(int argc, const char *argv[],
 738                                      const char * const usage[],
 739                                      const char *prefix)
 740{
 741        int f = 0;
 742
 743        argc = parse_options(argc, argv, builtin_commit_options, usage, 0);
 744        logfile = parse_options_fix_filename(prefix, logfile);
 745        template_file = parse_options_fix_filename(prefix, template_file);
 746
 747        if (force_author && !strchr(force_author, '>'))
 748                force_author = find_author_by_nickname(force_author);
 749
 750        if (logfile || message.len || use_message)
 751                use_editor = 0;
 752        if (edit_flag)
 753                use_editor = 1;
 754        if (!use_editor)
 755                setenv("GIT_EDITOR", ":", 1);
 756
 757        if (get_sha1("HEAD", head_sha1))
 758                initial_commit = 1;
 759
 760        if (!get_sha1("MERGE_HEAD", merge_head_sha1))
 761                in_merge = 1;
 762
 763        /* Sanity check options */
 764        if (amend && initial_commit)
 765                die("You have nothing to amend.");
 766        if (amend && in_merge)
 767                die("You are in the middle of a merge -- cannot amend.");
 768
 769        if (use_message)
 770                f++;
 771        if (edit_message)
 772                f++;
 773        if (logfile)
 774                f++;
 775        if (f > 1)
 776                die("Only one of -c/-C/-F can be used.");
 777        if (message.len && f > 0)
 778                die("Option -m cannot be combined with -c/-C/-F.");
 779        if (edit_message)
 780                use_message = edit_message;
 781        if (amend && !use_message)
 782                use_message = "HEAD";
 783        if (use_message) {
 784                unsigned char sha1[20];
 785                static char utf8[] = "UTF-8";
 786                const char *out_enc;
 787                char *enc, *end;
 788                struct commit *commit;
 789
 790                if (get_sha1(use_message, sha1))
 791                        die("could not lookup commit %s", use_message);
 792                commit = lookup_commit_reference(sha1);
 793                if (!commit || parse_commit(commit))
 794                        die("could not parse commit %s", use_message);
 795
 796                enc = strstr(commit->buffer, "\nencoding");
 797                if (enc) {
 798                        end = strchr(enc + 10, '\n');
 799                        enc = xstrndup(enc + 10, end - (enc + 10));
 800                } else {
 801                        enc = utf8;
 802                }
 803                out_enc = git_commit_encoding ? git_commit_encoding : utf8;
 804
 805                if (strcmp(out_enc, enc))
 806                        use_message_buffer =
 807                                reencode_string(commit->buffer, out_enc, enc);
 808
 809                /*
 810                 * If we failed to reencode the buffer, just copy it
 811                 * byte for byte so the user can try to fix it up.
 812                 * This also handles the case where input and output
 813                 * encodings are identical.
 814                 */
 815                if (use_message_buffer == NULL)
 816                        use_message_buffer = xstrdup(commit->buffer);
 817                if (enc != utf8)
 818                        free(enc);
 819        }
 820
 821        if (!!also + !!only + !!all + !!interactive > 1)
 822                die("Only one of --include/--only/--all/--interactive can be used.");
 823        if (argc == 0 && (also || (only && !amend)))
 824                die("No paths with --include/--only does not make sense.");
 825        if (argc == 0 && only && amend)
 826                only_include_assumed = "Clever... amending the last one with dirty index.";
 827        if (argc > 0 && !also && !only)
 828                only_include_assumed = "Explicit paths specified without -i nor -o; assuming --only paths...";
 829        if (!cleanup_arg || !strcmp(cleanup_arg, "default"))
 830                cleanup_mode = use_editor ? CLEANUP_ALL : CLEANUP_SPACE;
 831        else if (!strcmp(cleanup_arg, "verbatim"))
 832                cleanup_mode = CLEANUP_NONE;
 833        else if (!strcmp(cleanup_arg, "whitespace"))
 834                cleanup_mode = CLEANUP_SPACE;
 835        else if (!strcmp(cleanup_arg, "strip"))
 836                cleanup_mode = CLEANUP_ALL;
 837        else
 838                die("Invalid cleanup mode %s", cleanup_arg);
 839
 840        if (!untracked_files_arg)
 841                ; /* default already initialized */
 842        else if (!strcmp(untracked_files_arg, "no"))
 843                show_untracked_files = SHOW_NO_UNTRACKED_FILES;
 844        else if (!strcmp(untracked_files_arg, "normal"))
 845                show_untracked_files = SHOW_NORMAL_UNTRACKED_FILES;
 846        else if (!strcmp(untracked_files_arg, "all"))
 847                show_untracked_files = SHOW_ALL_UNTRACKED_FILES;
 848        else
 849                die("Invalid untracked files mode '%s'", untracked_files_arg);
 850
 851        if (all && argc > 0)
 852                die("Paths with -a does not make sense.");
 853        else if (interactive && argc > 0)
 854                die("Paths with --interactive does not make sense.");
 855
 856        return argc;
 857}
 858
 859int cmd_status(int argc, const char **argv, const char *prefix)
 860{
 861        const char *index_file;
 862        int commitable;
 863
 864        git_config(git_status_config, NULL);
 865
 866        if (wt_status_use_color == -1)
 867                wt_status_use_color = git_use_color_default;
 868
 869        if (diff_use_color_default == -1)
 870                diff_use_color_default = git_use_color_default;
 871
 872        argc = parse_and_validate_options(argc, argv, builtin_status_usage, prefix);
 873
 874        index_file = prepare_index(argc, argv, prefix);
 875
 876        commitable = run_status(stdout, index_file, prefix, 0);
 877
 878        rollback_index_files();
 879
 880        return commitable ? 0 : 1;
 881}
 882
 883static void print_summary(const char *prefix, const unsigned char *sha1)
 884{
 885        struct rev_info rev;
 886        struct commit *commit;
 887        static const char *format = "format:%h: \"%s\"";
 888        unsigned char junk_sha1[20];
 889        const char *head = resolve_ref("HEAD", junk_sha1, 0, NULL);
 890
 891        commit = lookup_commit(sha1);
 892        if (!commit)
 893                die("couldn't look up newly created commit");
 894        if (!commit || parse_commit(commit))
 895                die("could not parse newly created commit");
 896
 897        init_revisions(&rev, prefix);
 898        setup_revisions(0, NULL, &rev, NULL);
 899
 900        rev.abbrev = 0;
 901        rev.diff = 1;
 902        rev.diffopt.output_format =
 903                DIFF_FORMAT_SHORTSTAT | DIFF_FORMAT_SUMMARY;
 904
 905        rev.verbose_header = 1;
 906        rev.show_root_diff = 1;
 907        get_commit_format(format, &rev);
 908        rev.always_show_header = 0;
 909        rev.diffopt.detect_rename = 1;
 910        rev.diffopt.rename_limit = 100;
 911        rev.diffopt.break_opt = 0;
 912        diff_setup_done(&rev.diffopt);
 913
 914        printf("[%s%s]: created ",
 915                !prefixcmp(head, "refs/heads/") ?
 916                        head + 11 :
 917                        !strcmp(head, "HEAD") ?
 918                                "detached HEAD" :
 919                                head,
 920                initial_commit ? " (root-commit)" : "");
 921
 922        if (!log_tree_commit(&rev, commit)) {
 923                struct strbuf buf = STRBUF_INIT;
 924                format_commit_message(commit, format + 7, &buf, DATE_NORMAL);
 925                printf("%s\n", buf.buf);
 926                strbuf_release(&buf);
 927        }
 928}
 929
 930static int git_commit_config(const char *k, const char *v, void *cb)
 931{
 932        if (!strcmp(k, "commit.template"))
 933                return git_config_string(&template_file, k, v);
 934
 935        return git_status_config(k, v, cb);
 936}
 937
 938int cmd_commit(int argc, const char **argv, const char *prefix)
 939{
 940        struct strbuf sb = STRBUF_INIT;
 941        const char *index_file, *reflog_msg;
 942        char *nl, *p;
 943        unsigned char commit_sha1[20];
 944        struct ref_lock *ref_lock;
 945        struct commit_list *parents = NULL, **pptr = &parents;
 946        struct stat statbuf;
 947        int allow_fast_forward = 1;
 948
 949        git_config(git_commit_config, NULL);
 950
 951        if (wt_status_use_color == -1)
 952                wt_status_use_color = git_use_color_default;
 953
 954        argc = parse_and_validate_options(argc, argv, builtin_commit_usage, prefix);
 955
 956        index_file = prepare_index(argc, argv, prefix);
 957
 958        /* Set up everything for writing the commit object.  This includes
 959           running hooks, writing the trees, and interacting with the user.  */
 960        if (!prepare_to_commit(index_file, prefix)) {
 961                rollback_index_files();
 962                return 1;
 963        }
 964
 965        /* Determine parents */
 966        if (initial_commit) {
 967                reflog_msg = "commit (initial)";
 968        } else if (amend) {
 969                struct commit_list *c;
 970                struct commit *commit;
 971
 972                reflog_msg = "commit (amend)";
 973                commit = lookup_commit(head_sha1);
 974                if (!commit || parse_commit(commit))
 975                        die("could not parse HEAD commit");
 976
 977                for (c = commit->parents; c; c = c->next)
 978                        pptr = &commit_list_insert(c->item, pptr)->next;
 979        } else if (in_merge) {
 980                struct strbuf m = STRBUF_INIT;
 981                FILE *fp;
 982
 983                reflog_msg = "commit (merge)";
 984                pptr = &commit_list_insert(lookup_commit(head_sha1), pptr)->next;
 985                fp = fopen(git_path("MERGE_HEAD"), "r");
 986                if (fp == NULL)
 987                        die("could not open %s for reading: %s",
 988                            git_path("MERGE_HEAD"), strerror(errno));
 989                while (strbuf_getline(&m, fp, '\n') != EOF) {
 990                        unsigned char sha1[20];
 991                        if (get_sha1_hex(m.buf, sha1) < 0)
 992                                die("Corrupt MERGE_HEAD file (%s)", m.buf);
 993                        pptr = &commit_list_insert(lookup_commit(sha1), pptr)->next;
 994                }
 995                fclose(fp);
 996                strbuf_release(&m);
 997                if (!stat(git_path("MERGE_MODE"), &statbuf)) {
 998                        if (strbuf_read_file(&sb, git_path("MERGE_MODE"), 0) < 0)
 999                                die("could not read MERGE_MODE: %s",
1000                                                strerror(errno));
1001                        if (!strcmp(sb.buf, "no-ff"))
1002                                allow_fast_forward = 0;
1003                }
1004                if (allow_fast_forward)
1005                        parents = reduce_heads(parents);
1006        } else {
1007                reflog_msg = "commit";
1008                pptr = &commit_list_insert(lookup_commit(head_sha1), pptr)->next;
1009        }
1010
1011        /* Finally, get the commit message */
1012        strbuf_reset(&sb);
1013        if (strbuf_read_file(&sb, git_path(commit_editmsg), 0) < 0) {
1014                rollback_index_files();
1015                die("could not read commit message");
1016        }
1017
1018        /* Truncate the message just before the diff, if any. */
1019        if (verbose) {
1020                p = strstr(sb.buf, "\ndiff --git ");
1021                if (p != NULL)
1022                        strbuf_setlen(&sb, p - sb.buf + 1);
1023        }
1024
1025        if (cleanup_mode != CLEANUP_NONE)
1026                stripspace(&sb, cleanup_mode == CLEANUP_ALL);
1027        if (message_is_empty(&sb)) {
1028                rollback_index_files();
1029                fprintf(stderr, "Aborting commit due to empty commit message.\n");
1030                exit(1);
1031        }
1032
1033        if (commit_tree(sb.buf, active_cache_tree->sha1, parents, commit_sha1,
1034                        fmt_ident(author_name, author_email, author_date,
1035                                IDENT_ERROR_ON_NO_NAME))) {
1036                rollback_index_files();
1037                die("failed to write commit object");
1038        }
1039
1040        ref_lock = lock_any_ref_for_update("HEAD",
1041                                           initial_commit ? NULL : head_sha1,
1042                                           0);
1043
1044        nl = strchr(sb.buf, '\n');
1045        if (nl)
1046                strbuf_setlen(&sb, nl + 1 - sb.buf);
1047        else
1048                strbuf_addch(&sb, '\n');
1049        strbuf_insert(&sb, 0, reflog_msg, strlen(reflog_msg));
1050        strbuf_insert(&sb, strlen(reflog_msg), ": ", 2);
1051
1052        if (!ref_lock) {
1053                rollback_index_files();
1054                die("cannot lock HEAD ref");
1055        }
1056        if (write_ref_sha1(ref_lock, commit_sha1, sb.buf) < 0) {
1057                rollback_index_files();
1058                die("cannot update HEAD ref");
1059        }
1060
1061        unlink(git_path("MERGE_HEAD"));
1062        unlink(git_path("MERGE_MSG"));
1063        unlink(git_path("MERGE_MODE"));
1064        unlink(git_path("SQUASH_MSG"));
1065
1066        if (commit_index_files())
1067                die ("Repository has been updated, but unable to write\n"
1068                     "new_index file. Check that disk is not full or quota is\n"
1069                     "not exceeded, and then \"git reset HEAD\" to recover.");
1070
1071        rerere();
1072        run_hook(get_index_file(), "post-commit", NULL);
1073        if (!quiet)
1074                print_summary(prefix, commit_sha1);
1075
1076        return 0;
1077}