Andrew's git / gitweb.git / builtin/rev-parse.c
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builtin / rev-parse.con commit Merge branch 'jc/maint-1.6.6-pathspec-stdin-and-cmdline' (25197eb)
   1/*
   2 * rev-parse.c
   3 *
   4 * Copyright (C) Linus Torvalds, 2005
   5 */
   6#include "cache.h"
   7#include "commit.h"
   8#include "refs.h"
   9#include "quote.h"
  10#include "builtin.h"
  11#include "parse-options.h"
  12
  13#define DO_REVS         1
  14#define DO_NOREV        2
  15#define DO_FLAGS        4
  16#define DO_NONFLAGS     8
  17static int filter = ~0;
  18
  19static const char *def;
  20
  21#define NORMAL 0
  22#define REVERSED 1
  23static int show_type = NORMAL;
  24
  25#define SHOW_SYMBOLIC_ASIS 1
  26#define SHOW_SYMBOLIC_FULL 2
  27static int symbolic;
  28static int abbrev;
  29static int abbrev_ref;
  30static int abbrev_ref_strict;
  31static int output_sq;
  32
  33/*
  34 * Some arguments are relevant "revision" arguments,
  35 * others are about output format or other details.
  36 * This sorts it all out.
  37 */
  38static int is_rev_argument(const char *arg)
  39{
  40        static const char *rev_args[] = {
  41                "--all",
  42                "--bisect",
  43                "--dense",
  44                "--branches=",
  45                "--branches",
  46                "--header",
  47                "--max-age=",
  48                "--max-count=",
  49                "--min-age=",
  50                "--no-merges",
  51                "--objects",
  52                "--objects-edge",
  53                "--parents",
  54                "--pretty",
  55                "--remotes=",
  56                "--remotes",
  57                "--glob=",
  58                "--sparse",
  59                "--tags=",
  60                "--tags",
  61                "--topo-order",
  62                "--date-order",
  63                "--unpacked",
  64                NULL
  65        };
  66        const char **p = rev_args;
  67
  68        /* accept -<digit>, like traditional "head" */
  69        if ((*arg == '-') && isdigit(arg[1]))
  70                return 1;
  71
  72        for (;;) {
  73                const char *str = *p++;
  74                int len;
  75                if (!str)
  76                        return 0;
  77                len = strlen(str);
  78                if (!strcmp(arg, str) ||
  79                    (str[len-1] == '=' && !strncmp(arg, str, len)))
  80                        return 1;
  81        }
  82}
  83
  84/* Output argument as a string, either SQ or normal */
  85static void show(const char *arg)
  86{
  87        if (output_sq) {
  88                int sq = '\'', ch;
  89
  90                putchar(sq);
  91                while ((ch = *arg++)) {
  92                        if (ch == sq)
  93                                fputs("'\\'", stdout);
  94                        putchar(ch);
  95                }
  96                putchar(sq);
  97                putchar(' ');
  98        }
  99        else
 100                puts(arg);
 101}
 102
 103/* Like show(), but with a negation prefix according to type */
 104static void show_with_type(int type, const char *arg)
 105{
 106        if (type != show_type)
 107                putchar('^');
 108        show(arg);
 109}
 110
 111/* Output a revision, only if filter allows it */
 112static void show_rev(int type, const unsigned char *sha1, const char *name)
 113{
 114        if (!(filter & DO_REVS))
 115                return;
 116        def = NULL;
 117
 118        if ((symbolic || abbrev_ref) && name) {
 119                if (symbolic == SHOW_SYMBOLIC_FULL || abbrev_ref) {
 120                        unsigned char discard[20];
 121                        char *full;
 122
 123                        switch (dwim_ref(name, strlen(name), discard, &full)) {
 124                        case 0:
 125                                /*
 126                                 * Not found -- not a ref.  We could
 127                                 * emit "name" here, but symbolic-full
 128                                 * users are interested in finding the
 129                                 * refs spelled in full, and they would
 130                                 * need to filter non-refs if we did so.
 131                                 */
 132                                break;
 133                        case 1: /* happy */
 134                                if (abbrev_ref)
 135                                        full = shorten_unambiguous_ref(full,
 136                                                abbrev_ref_strict);
 137                                show_with_type(type, full);
 138                                break;
 139                        default: /* ambiguous */
 140                                error("refname '%s' is ambiguous", name);
 141                                break;
 142                        }
 143                } else {
 144                        show_with_type(type, name);
 145                }
 146        }
 147        else if (abbrev)
 148                show_with_type(type, find_unique_abbrev(sha1, abbrev));
 149        else
 150                show_with_type(type, sha1_to_hex(sha1));
 151}
 152
 153/* Output a flag, only if filter allows it. */
 154static int show_flag(const char *arg)
 155{
 156        if (!(filter & DO_FLAGS))
 157                return 0;
 158        if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
 159                show(arg);
 160                return 1;
 161        }
 162        return 0;
 163}
 164
 165static int show_default(void)
 166{
 167        const char *s = def;
 168
 169        if (s) {
 170                unsigned char sha1[20];
 171
 172                def = NULL;
 173                if (!get_sha1(s, sha1)) {
 174                        show_rev(NORMAL, sha1, s);
 175                        return 1;
 176                }
 177        }
 178        return 0;
 179}
 180
 181static int show_reference(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 182{
 183        show_rev(NORMAL, sha1, refname);
 184        return 0;
 185}
 186
 187static int anti_reference(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 188{
 189        show_rev(REVERSED, sha1, refname);
 190        return 0;
 191}
 192
 193static void show_datestring(const char *flag, const char *datestr)
 194{
 195        static char buffer[100];
 196
 197        /* date handling requires both flags and revs */
 198        if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
 199                return;
 200        snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
 201        show(buffer);
 202}
 203
 204static int show_file(const char *arg)
 205{
 206        show_default();
 207        if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
 208                show(arg);
 209                return 1;
 210        }
 211        return 0;
 212}
 213
 214static int try_difference(const char *arg)
 215{
 216        char *dotdot;
 217        unsigned char sha1[20];
 218        unsigned char end[20];
 219        const char *next;
 220        const char *this;
 221        int symmetric;
 222
 223        if (!(dotdot = strstr(arg, "..")))
 224                return 0;
 225        next = dotdot + 2;
 226        this = arg;
 227        symmetric = (*next == '.');
 228
 229        *dotdot = 0;
 230        next += symmetric;
 231
 232        if (!*next)
 233                next = "HEAD";
 234        if (dotdot == arg)
 235                this = "HEAD";
 236        if (!get_sha1(this, sha1) && !get_sha1(next, end)) {
 237                show_rev(NORMAL, end, next);
 238                show_rev(symmetric ? NORMAL : REVERSED, sha1, this);
 239                if (symmetric) {
 240                        struct commit_list *exclude;
 241                        struct commit *a, *b;
 242                        a = lookup_commit_reference(sha1);
 243                        b = lookup_commit_reference(end);
 244                        exclude = get_merge_bases(a, b, 1);
 245                        while (exclude) {
 246                                struct commit_list *n = exclude->next;
 247                                show_rev(REVERSED,
 248                                         exclude->item->object.sha1,NULL);
 249                                free(exclude);
 250                                exclude = n;
 251                        }
 252                }
 253                return 1;
 254        }
 255        *dotdot = '.';
 256        return 0;
 257}
 258
 259static int try_parent_shorthands(const char *arg)
 260{
 261        char *dotdot;
 262        unsigned char sha1[20];
 263        struct commit *commit;
 264        struct commit_list *parents;
 265        int parents_only;
 266
 267        if ((dotdot = strstr(arg, "^!")))
 268                parents_only = 0;
 269        else if ((dotdot = strstr(arg, "^@")))
 270                parents_only = 1;
 271
 272        if (!dotdot || dotdot[2])
 273                return 0;
 274
 275        *dotdot = 0;
 276        if (get_sha1(arg, sha1))
 277                return 0;
 278
 279        if (!parents_only)
 280                show_rev(NORMAL, sha1, arg);
 281        commit = lookup_commit_reference(sha1);
 282        for (parents = commit->parents; parents; parents = parents->next)
 283                show_rev(parents_only ? NORMAL : REVERSED,
 284                                parents->item->object.sha1, arg);
 285
 286        return 1;
 287}
 288
 289static int parseopt_dump(const struct option *o, const char *arg, int unset)
 290{
 291        struct strbuf *parsed = o->value;
 292        if (unset)
 293                strbuf_addf(parsed, " --no-%s", o->long_name);
 294        else if (o->short_name)
 295                strbuf_addf(parsed, " -%c", o->short_name);
 296        else
 297                strbuf_addf(parsed, " --%s", o->long_name);
 298        if (arg) {
 299                strbuf_addch(parsed, ' ');
 300                sq_quote_buf(parsed, arg);
 301        }
 302        return 0;
 303}
 304
 305static const char *skipspaces(const char *s)
 306{
 307        while (isspace(*s))
 308                s++;
 309        return s;
 310}
 311
 312static int cmd_parseopt(int argc, const char **argv, const char *prefix)
 313{
 314        static int keep_dashdash = 0, stop_at_non_option = 0;
 315        static char const * const parseopt_usage[] = {
 316                "git rev-parse --parseopt [options] -- [<args>...]",
 317                NULL
 318        };
 319        static struct option parseopt_opts[] = {
 320                OPT_BOOLEAN(0, "keep-dashdash", &keep_dashdash,
 321                                        "keep the `--` passed as an arg"),
 322                OPT_BOOLEAN(0, "stop-at-non-option", &stop_at_non_option,
 323                                        "stop parsing after the "
 324                                        "first non-option argument"),
 325                OPT_END(),
 326        };
 327
 328        struct strbuf sb = STRBUF_INIT, parsed = STRBUF_INIT;
 329        const char **usage = NULL;
 330        struct option *opts = NULL;
 331        int onb = 0, osz = 0, unb = 0, usz = 0;
 332
 333        strbuf_addstr(&parsed, "set --");
 334        argc = parse_options(argc, argv, prefix, parseopt_opts, parseopt_usage,
 335                             PARSE_OPT_KEEP_DASHDASH);
 336        if (argc < 1 || strcmp(argv[0], "--"))
 337                usage_with_options(parseopt_usage, parseopt_opts);
 338
 339        /* get the usage up to the first line with a -- on it */
 340        for (;;) {
 341                if (strbuf_getline(&sb, stdin, '\n') == EOF)
 342                        die("premature end of input");
 343                ALLOC_GROW(usage, unb + 1, usz);
 344                if (!strcmp("--", sb.buf)) {
 345                        if (unb < 1)
 346                                die("no usage string given before the `--' separator");
 347                        usage[unb] = NULL;
 348                        break;
 349                }
 350                usage[unb++] = strbuf_detach(&sb, NULL);
 351        }
 352
 353        /* parse: (<short>|<short>,<long>|<long>)[=?]? SP+ <help> */
 354        while (strbuf_getline(&sb, stdin, '\n') != EOF) {
 355                const char *s;
 356                struct option *o;
 357
 358                if (!sb.len)
 359                        continue;
 360
 361                ALLOC_GROW(opts, onb + 1, osz);
 362                memset(opts + onb, 0, sizeof(opts[onb]));
 363
 364                o = &opts[onb++];
 365                s = strchr(sb.buf, ' ');
 366                if (!s || *sb.buf == ' ') {
 367                        o->type = OPTION_GROUP;
 368                        o->help = xstrdup(skipspaces(sb.buf));
 369                        continue;
 370                }
 371
 372                o->type = OPTION_CALLBACK;
 373                o->help = xstrdup(skipspaces(s));
 374                o->value = &parsed;
 375                o->flags = PARSE_OPT_NOARG;
 376                o->callback = &parseopt_dump;
 377                while (s > sb.buf && strchr("*=?!", s[-1])) {
 378                        switch (*--s) {
 379                        case '=':
 380                                o->flags &= ~PARSE_OPT_NOARG;
 381                                break;
 382                        case '?':
 383                                o->flags &= ~PARSE_OPT_NOARG;
 384                                o->flags |= PARSE_OPT_OPTARG;
 385                                break;
 386                        case '!':
 387                                o->flags |= PARSE_OPT_NONEG;
 388                                break;
 389                        case '*':
 390                                o->flags |= PARSE_OPT_HIDDEN;
 391                                break;
 392                        }
 393                }
 394
 395                if (s - sb.buf == 1) /* short option only */
 396                        o->short_name = *sb.buf;
 397                else if (sb.buf[1] != ',') /* long option only */
 398                        o->long_name = xmemdupz(sb.buf, s - sb.buf);
 399                else {
 400                        o->short_name = *sb.buf;
 401                        o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
 402                }
 403        }
 404        strbuf_release(&sb);
 405
 406        /* put an OPT_END() */
 407        ALLOC_GROW(opts, onb + 1, osz);
 408        memset(opts + onb, 0, sizeof(opts[onb]));
 409        argc = parse_options(argc, argv, prefix, opts, usage,
 410                        (keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0) |
 411                        (stop_at_non_option ? PARSE_OPT_STOP_AT_NON_OPTION : 0) |
 412                        PARSE_OPT_SHELL_EVAL);
 413
 414        strbuf_addf(&parsed, " --");
 415        sq_quote_argv(&parsed, argv, 0);
 416        puts(parsed.buf);
 417        return 0;
 418}
 419
 420static int cmd_sq_quote(int argc, const char **argv)
 421{
 422        struct strbuf buf = STRBUF_INIT;
 423
 424        if (argc)
 425                sq_quote_argv(&buf, argv, 0);
 426        printf("%s\n", buf.buf);
 427        strbuf_release(&buf);
 428
 429        return 0;
 430}
 431
 432static void die_no_single_rev(int quiet)
 433{
 434        if (quiet)
 435                exit(1);
 436        else
 437                die("Needed a single revision");
 438}
 439
 440static const char builtin_rev_parse_usage[] =
 441"git rev-parse --parseopt [options] -- [<args>...]\n"
 442"   or: git rev-parse --sq-quote [<arg>...]\n"
 443"   or: git rev-parse [options] [<arg>...]\n"
 444"\n"
 445"Run \"git rev-parse --parseopt -h\" for more information on the first usage.";
 446
 447int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 448{
 449        int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
 450        unsigned char sha1[20];
 451        const char *name = NULL;
 452
 453        if (argc > 1 && !strcmp("--parseopt", argv[1]))
 454                return cmd_parseopt(argc - 1, argv + 1, prefix);
 455
 456        if (argc > 1 && !strcmp("--sq-quote", argv[1]))
 457                return cmd_sq_quote(argc - 2, argv + 2);
 458
 459        if (argc == 2 && !strcmp("--local-env-vars", argv[1])) {
 460                int i;
 461                for (i = 0; local_repo_env[i]; i++)
 462                        printf("%s\n", local_repo_env[i]);
 463                return 0;
 464        }
 465
 466        if (argc > 1 && !strcmp("-h", argv[1]))
 467                usage(builtin_rev_parse_usage);
 468
 469        prefix = setup_git_directory();
 470        git_config(git_default_config, NULL);
 471        for (i = 1; i < argc; i++) {
 472                const char *arg = argv[i];
 473
 474                if (as_is) {
 475                        if (show_file(arg) && as_is < 2)
 476                                verify_filename(prefix, arg);
 477                        continue;
 478                }
 479                if (!strcmp(arg,"-n")) {
 480                        if (++i >= argc)
 481                                die("-n requires an argument");
 482                        if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
 483                                show(arg);
 484                                show(argv[i]);
 485                        }
 486                        continue;
 487                }
 488                if (!prefixcmp(arg, "-n")) {
 489                        if ((filter & DO_FLAGS) && (filter & DO_REVS))
 490                                show(arg);
 491                        continue;
 492                }
 493
 494                if (*arg == '-') {
 495                        if (!strcmp(arg, "--")) {
 496                                as_is = 2;
 497                                /* Pass on the "--" if we show anything but files.. */
 498                                if (filter & (DO_FLAGS | DO_REVS))
 499                                        show_file(arg);
 500                                continue;
 501                        }
 502                        if (!strcmp(arg, "--default")) {
 503                                def = argv[i+1];
 504                                i++;
 505                                continue;
 506                        }
 507                        if (!strcmp(arg, "--revs-only")) {
 508                                filter &= ~DO_NOREV;
 509                                continue;
 510                        }
 511                        if (!strcmp(arg, "--no-revs")) {
 512                                filter &= ~DO_REVS;
 513                                continue;
 514                        }
 515                        if (!strcmp(arg, "--flags")) {
 516                                filter &= ~DO_NONFLAGS;
 517                                continue;
 518                        }
 519                        if (!strcmp(arg, "--no-flags")) {
 520                                filter &= ~DO_FLAGS;
 521                                continue;
 522                        }
 523                        if (!strcmp(arg, "--verify")) {
 524                                filter &= ~(DO_FLAGS|DO_NOREV);
 525                                verify = 1;
 526                                continue;
 527                        }
 528                        if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
 529                                quiet = 1;
 530                                continue;
 531                        }
 532                        if (!strcmp(arg, "--short") ||
 533                            !prefixcmp(arg, "--short=")) {
 534                                filter &= ~(DO_FLAGS|DO_NOREV);
 535                                verify = 1;
 536                                abbrev = DEFAULT_ABBREV;
 537                                if (arg[7] == '=')
 538                                        abbrev = strtoul(arg + 8, NULL, 10);
 539                                if (abbrev < MINIMUM_ABBREV)
 540                                        abbrev = MINIMUM_ABBREV;
 541                                else if (40 <= abbrev)
 542                                        abbrev = 40;
 543                                continue;
 544                        }
 545                        if (!strcmp(arg, "--sq")) {
 546                                output_sq = 1;
 547                                continue;
 548                        }
 549                        if (!strcmp(arg, "--not")) {
 550                                show_type ^= REVERSED;
 551                                continue;
 552                        }
 553                        if (!strcmp(arg, "--symbolic")) {
 554                                symbolic = SHOW_SYMBOLIC_ASIS;
 555                                continue;
 556                        }
 557                        if (!strcmp(arg, "--symbolic-full-name")) {
 558                                symbolic = SHOW_SYMBOLIC_FULL;
 559                                continue;
 560                        }
 561                        if (!prefixcmp(arg, "--abbrev-ref") &&
 562                            (!arg[12] || arg[12] == '=')) {
 563                                abbrev_ref = 1;
 564                                abbrev_ref_strict = warn_ambiguous_refs;
 565                                if (arg[12] == '=') {
 566                                        if (!strcmp(arg + 13, "strict"))
 567                                                abbrev_ref_strict = 1;
 568                                        else if (!strcmp(arg + 13, "loose"))
 569                                                abbrev_ref_strict = 0;
 570                                        else
 571                                                die("unknown mode for %s", arg);
 572                                }
 573                                continue;
 574                        }
 575                        if (!strcmp(arg, "--all")) {
 576                                for_each_ref(show_reference, NULL);
 577                                continue;
 578                        }
 579                        if (!strcmp(arg, "--bisect")) {
 580                                for_each_ref_in("refs/bisect/bad", show_reference, NULL);
 581                                for_each_ref_in("refs/bisect/good", anti_reference, NULL);
 582                                continue;
 583                        }
 584                        if (!prefixcmp(arg, "--branches=")) {
 585                                for_each_glob_ref_in(show_reference, arg + 11,
 586                                        "refs/heads/", NULL);
 587                                continue;
 588                        }
 589                        if (!strcmp(arg, "--branches")) {
 590                                for_each_branch_ref(show_reference, NULL);
 591                                continue;
 592                        }
 593                        if (!prefixcmp(arg, "--tags=")) {
 594                                for_each_glob_ref_in(show_reference, arg + 7,
 595                                        "refs/tags/", NULL);
 596                                continue;
 597                        }
 598                        if (!strcmp(arg, "--tags")) {
 599                                for_each_tag_ref(show_reference, NULL);
 600                                continue;
 601                        }
 602                        if (!prefixcmp(arg, "--glob=")) {
 603                                for_each_glob_ref(show_reference, arg + 7, NULL);
 604                                continue;
 605                        }
 606                        if (!prefixcmp(arg, "--remotes=")) {
 607                                for_each_glob_ref_in(show_reference, arg + 10,
 608                                        "refs/remotes/", NULL);
 609                                continue;
 610                        }
 611                        if (!strcmp(arg, "--remotes")) {
 612                                for_each_remote_ref(show_reference, NULL);
 613                                continue;
 614                        }
 615                        if (!strcmp(arg, "--show-toplevel")) {
 616                                const char *work_tree = get_git_work_tree();
 617                                if (work_tree)
 618                                        puts(work_tree);
 619                                continue;
 620                        }
 621                        if (!strcmp(arg, "--show-prefix")) {
 622                                if (prefix)
 623                                        puts(prefix);
 624                                continue;
 625                        }
 626                        if (!strcmp(arg, "--show-cdup")) {
 627                                const char *pfx = prefix;
 628                                if (!is_inside_work_tree()) {
 629                                        const char *work_tree =
 630                                                get_git_work_tree();
 631                                        if (work_tree)
 632                                                printf("%s\n", work_tree);
 633                                        continue;
 634                                }
 635                                while (pfx) {
 636                                        pfx = strchr(pfx, '/');
 637                                        if (pfx) {
 638                                                pfx++;
 639                                                printf("../");
 640                                        }
 641                                }
 642                                putchar('\n');
 643                                continue;
 644                        }
 645                        if (!strcmp(arg, "--git-dir")) {
 646                                const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
 647                                static char cwd[PATH_MAX];
 648                                int len;
 649                                if (gitdir) {
 650                                        puts(gitdir);
 651                                        continue;
 652                                }
 653                                if (!prefix) {
 654                                        puts(".git");
 655                                        continue;
 656                                }
 657                                if (!getcwd(cwd, PATH_MAX))
 658                                        die_errno("unable to get current working directory");
 659                                len = strlen(cwd);
 660                                printf("%s%s.git\n", cwd, len && cwd[len-1] != '/' ? "/" : "");
 661                                continue;
 662                        }
 663                        if (!strcmp(arg, "--is-inside-git-dir")) {
 664                                printf("%s\n", is_inside_git_dir() ? "true"
 665                                                : "false");
 666                                continue;
 667                        }
 668                        if (!strcmp(arg, "--is-inside-work-tree")) {
 669                                printf("%s\n", is_inside_work_tree() ? "true"
 670                                                : "false");
 671                                continue;
 672                        }
 673                        if (!strcmp(arg, "--is-bare-repository")) {
 674                                printf("%s\n", is_bare_repository() ? "true"
 675                                                : "false");
 676                                continue;
 677                        }
 678                        if (!prefixcmp(arg, "--since=")) {
 679                                show_datestring("--max-age=", arg+8);
 680                                continue;
 681                        }
 682                        if (!prefixcmp(arg, "--after=")) {
 683                                show_datestring("--max-age=", arg+8);
 684                                continue;
 685                        }
 686                        if (!prefixcmp(arg, "--before=")) {
 687                                show_datestring("--min-age=", arg+9);
 688                                continue;
 689                        }
 690                        if (!prefixcmp(arg, "--until=")) {
 691                                show_datestring("--min-age=", arg+8);
 692                                continue;
 693                        }
 694                        if (show_flag(arg) && verify)
 695                                die_no_single_rev(quiet);
 696                        continue;
 697                }
 698
 699                /* Not a flag argument */
 700                if (try_difference(arg))
 701                        continue;
 702                if (try_parent_shorthands(arg))
 703                        continue;
 704                name = arg;
 705                type = NORMAL;
 706                if (*arg == '^') {
 707                        name++;
 708                        type = REVERSED;
 709                }
 710                if (!get_sha1(name, sha1)) {
 711                        if (verify)
 712                                revs_count++;
 713                        else
 714                                show_rev(type, sha1, name);
 715                        continue;
 716                }
 717                if (verify)
 718                        die_no_single_rev(quiet);
 719                as_is = 1;
 720                if (!show_file(arg))
 721                        continue;
 722                verify_filename(prefix, arg);
 723        }
 724        if (verify) {
 725                if (revs_count == 1) {
 726                        show_rev(type, sha1, name);
 727                        return 0;
 728                } else if (revs_count == 0 && show_default())
 729                        return 0;
 730                die_no_single_rev(quiet);
 731        } else
 732                show_default();
 733        return 0;
 734}