builtin/rev-parse.c

   1 /*
   2  * rev-parse.c
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  */
   6 #define USE_THE_REPOSITORY_VARIABLE
   7 #include "builtin.h"
   8
   9 #include "abspath.h"
  10 #include "config.h"
  11 #include "commit.h"
  12 #include "environment.h"
  13 #include "gettext.h"
  14 #include "hash.h"
  15 #include "hex.h"
  16 #include "refs.h"
  17 #include "quote.h"
  18 #include "object-name.h"
  19 #include "parse-options.h"
  20 #include "path.h"
  21 #include "diff.h"
  22 #include "read-cache-ll.h"
  23 #include "repo-settings.h"
  24 #include "repository.h"
  25 #include "revision.h"
  26 #include "setup.h"
  27 #include "split-index.h"
  28 #include "submodule.h"
  29 #include "commit-reach.h"
  30 #include "shallow.h"
  31 #include "object-file-convert.h"
  32
  33 #define DO_REVS         1
  34 #define DO_NOREV        2
  35 #define DO_FLAGS        4
  36 #define DO_NONFLAGS     8
  37 static int filter = ~0;
  38
  39 static const char *def;
  40
  41 #define NORMAL 0
  42 #define REVERSED 1
  43 static int show_type = NORMAL;
  44
  45 #define SHOW_SYMBOLIC_ASIS 1
  46 #define SHOW_SYMBOLIC_FULL 2
  47 static int symbolic;
  48 static int abbrev;
  49 static int abbrev_ref;
  50 static int abbrev_ref_strict;
  51 static int output_sq;
  52
  53 static int stuck_long;
  54 static struct ref_exclusions ref_excludes = REF_EXCLUSIONS_INIT;
  55
  56 /*
  57  * Some arguments are relevant "revision" arguments,
  58  * others are about output format or other details.
  59  * This sorts it all out.
  60  */
  61 static int is_rev_argument(const char *arg)
  62 {
  63         static const char *rev_args[] = {
  64                 "--all",
  65                 "--bisect",
  66                 "--dense",
  67                 "--branches=",
  68                 "--branches",
  69                 "--header",
  70                 "--ignore-missing",
  71                 "--max-age=",
  72                 "--max-count=",
  73                 "--min-age=",
  74                 "--no-merges",
  75                 "--min-parents=",
  76                 "--no-min-parents",
  77                 "--max-parents=",
  78                 "--no-max-parents",
  79                 "--objects",
  80                 "--objects-edge",
  81                 "--parents",
  82                 "--pretty",
  83                 "--remotes=",
  84                 "--remotes",
  85                 "--glob=",
  86                 "--sparse",
  87                 "--tags=",
  88                 "--tags",
  89                 "--topo-order",
  90                 "--date-order",
  91                 "--unpacked",
  92                 NULL
  93         };
  94         const char **p = rev_args;
  95
  96         /* accept -<digit>, like traditional "head" */
  97         if ((*arg == '-') && isdigit(arg[1]))
  98                 return 1;
  99
 100         for (;;) {
 101                 const char *str = *p++;
 102                 int len;
 103                 if (!str)
 104                         return 0;
 105                 len = strlen(str);
 106                 if (!strcmp(arg, str) ||
 107                     (str[len-1] == '=' && !strncmp(arg, str, len)))
 108                         return 1;
 109         }
 110 }
 111
 112 /* Output argument as a string, either SQ or normal */
 113 static void show(const char *arg)
 114 {
 115         if (output_sq) {
 116                 int sq = '\'', ch;
 117
 118                 putchar(sq);
 119                 while ((ch = *arg++)) {
 120                         if (ch == sq)
 121                                 fputs("'\\'", stdout);
 122                         putchar(ch);
 123                 }
 124                 putchar(sq);
 125                 putchar(' ');
 126         }
 127         else
 128                 puts(arg);
 129 }
 130
 131 /* Like show(), but with a negation prefix according to type */
 132 static void show_with_type(int type, const char *arg)
 133 {
 134         if (type != show_type)
 135                 putchar('^');
 136         show(arg);
 137 }
 138
 139 /* Output a revision, only if filter allows it */
 140 static void show_rev(int type, const struct object_id *oid, const char *name)
 141 {
 142         if (!(filter & DO_REVS))
 143                 return;
 144         def = NULL;
 145
 146         if ((symbolic || abbrev_ref) && name) {
 147                 if (symbolic == SHOW_SYMBOLIC_FULL || abbrev_ref) {
 148                         struct object_id discard;
 149                         char *full;
 150
 151                         switch (repo_dwim_ref(the_repository, name,
 152                                               strlen(name), &discard, &full,
 153                                               0)) {
 154                         case 0:
 155                                 /*
 156                                  * Not found -- not a ref.  We could
 157                                  * emit "name" here, but symbolic-full
 158                                  * users are interested in finding the
 159                                  * refs spelled in full, and they would
 160                                  * need to filter non-refs if we did so.
 161                                  */
 162                                 break;
 163                         case 1: /* happy */
 164                                 if (abbrev_ref) {
 165                                         char *old = full;
 166                                         full = refs_shorten_unambiguous_ref(get_main_ref_store(the_repository),
 167                                                                             full,
 168                                                                             abbrev_ref_strict);
 169                                         free(old);
 170                                 }
 171                                 show_with_type(type, full);
 172                                 break;
 173                         default: /* ambiguous */
 174                                 error("refname '%s' is ambiguous", name);
 175                                 break;
 176                         }
 177                         free(full);
 178                 } else {
 179                         show_with_type(type, name);
 180                 }
 181         }
 182         else if (abbrev)
 183                 show_with_type(type,
 184                                repo_find_unique_abbrev(the_repository, oid, abbrev));
 185         else
 186                 show_with_type(type, oid_to_hex(oid));
 187 }
 188
 189 /* Output a flag, only if filter allows it. */
 190 static int show_flag(const char *arg)
 191 {
 192         if (!(filter & DO_FLAGS))
 193                 return 0;
 194         if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
 195                 show(arg);
 196                 return 1;
 197         }
 198         return 0;
 199 }
 200
 201 static int show_default(void)
 202 {
 203         const char *s = def;
 204
 205         if (s) {
 206                 struct object_id oid;
 207
 208                 def = NULL;
 209                 if (!repo_get_oid(the_repository, s, &oid)) {
 210                         show_rev(NORMAL, &oid, s);
 211                         return 1;
 212                 }
 213         }
 214         return 0;
 215 }
 216
 217 static int show_reference(const char *refname, const char *referent UNUSED, const struct object_id *oid,
 218                           int flag UNUSED, void *cb_data UNUSED)
 219 {
 220         if (ref_excluded(&ref_excludes, refname))
 221                 return 0;
 222         show_rev(NORMAL, oid, refname);
 223         return 0;
 224 }
 225
 226 static int anti_reference(const char *refname, const char *referent UNUSED, const struct object_id *oid,
 227                           int flag UNUSED, void *cb_data UNUSED)
 228 {
 229         show_rev(REVERSED, oid, refname);
 230         return 0;
 231 }
 232
 233 static int show_abbrev(const struct object_id *oid, void *cb_data UNUSED)
 234 {
 235         show_rev(NORMAL, oid, NULL);
 236         return 0;
 237 }
 238
 239 static void show_datestring(const char *flag, const char *datestr)
 240 {
 241         char *buffer;
 242
 243         /* date handling requires both flags and revs */
 244         if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
 245                 return;
 246         buffer = xstrfmt("%s%"PRItime, flag, approxidate(datestr));
 247         show(buffer);
 248         free(buffer);
 249 }
 250
 251 static int show_file(const char *arg, int output_prefix)
 252 {
 253         show_default();
 254         if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
 255                 if (output_prefix) {
 256                         const char *prefix = startup_info->prefix;
 257                         char *fname = prefix_filename(prefix, arg);
 258                         show(fname);
 259                         free(fname);
 260                 } else
 261                         show(arg);
 262                 return 1;
 263         }
 264         return 0;
 265 }
 266
 267 static int try_difference(const char *arg)
 268 {
 269         char *dotdot;
 270         struct object_id start_oid;
 271         struct object_id end_oid;
 272         const char *end;
 273         const char *start;
 274         int symmetric;
 275         static const char head_by_default[] = "HEAD";
 276
 277         if (!(dotdot = strstr(arg, "..")))
 278                 return 0;
 279         end = dotdot + 2;
 280         start = arg;
 281         symmetric = (*end == '.');
 282
 283         *dotdot = 0;
 284         end += symmetric;
 285
 286         if (!*end)
 287                 end = head_by_default;
 288         if (dotdot == arg)
 289                 start = head_by_default;
 290
 291         if (start == head_by_default && end == head_by_default &&
 292             !symmetric) {
 293                 /*
 294                  * Just ".."?  That is not a range but the
 295                  * pathspec for the parent directory.
 296                  */
 297                 *dotdot = '.';
 298                 return 0;
 299         }
 300
 301         if (!repo_get_oid_committish(the_repository, start, &start_oid) && !repo_get_oid_committish(the_repository, end, &end_oid)) {
 302                 show_rev(NORMAL, &end_oid, end);
 303                 show_rev(symmetric ? NORMAL : REVERSED, &start_oid, start);
 304                 if (symmetric) {
 305                         struct commit_list *exclude = NULL;
 306                         struct commit *a, *b;
 307                         a = lookup_commit_reference(the_repository, &start_oid);
 308                         b = lookup_commit_reference(the_repository, &end_oid);
 309                         if (!a || !b) {
 310                                 *dotdot = '.';
 311                                 return 0;
 312                         }
 313                         if (repo_get_merge_bases(the_repository, a, b, &exclude) < 0)
 314                                 exit(128);
 315                         while (exclude) {
 316                                 struct commit *commit = pop_commit(&exclude);
 317                                 show_rev(REVERSED, &commit->object.oid, NULL);
 318                         }
 319                 }
 320                 *dotdot = '.';
 321                 return 1;
 322         }
 323         *dotdot = '.';
 324         return 0;
 325 }
 326
 327 static int try_parent_shorthands(const char *arg)
 328 {
 329         char *dotdot;
 330         struct object_id oid;
 331         struct commit *commit;
 332         struct commit_list *parents;
 333         int parent_number;
 334         int include_rev = 0;
 335         int include_parents = 0;
 336         int exclude_parent = 0;
 337
 338         if ((dotdot = strstr(arg, "^!"))) {
 339                 include_rev = 1;
 340                 if (dotdot[2])
 341                         return 0;
 342         } else if ((dotdot = strstr(arg, "^@"))) {
 343                 include_parents = 1;
 344                 if (dotdot[2])
 345                         return 0;
 346         } else if ((dotdot = strstr(arg, "^-"))) {
 347                 include_rev = 1;
 348                 exclude_parent = 1;
 349
 350                 if (dotdot[2]) {
 351                         char *end;
 352                         exclude_parent = strtoul(dotdot + 2, &end, 10);
 353                         if (*end != '\0' || !exclude_parent)
 354                                 return 0;
 355                 }
 356         } else
 357                 return 0;
 358
 359         *dotdot = 0;
 360         if (repo_get_oid_committish(the_repository, arg, &oid) ||
 361             !(commit = lookup_commit_reference(the_repository, &oid))) {
 362                 *dotdot = '^';
 363                 return 0;
 364         }
 365
 366         if (exclude_parent &&
 367             exclude_parent > commit_list_count(commit->parents)) {
 368                 *dotdot = '^';
 369                 return 0;
 370         }
 371
 372         if (include_rev)
 373                 show_rev(NORMAL, &oid, arg);
 374         for (parents = commit->parents, parent_number = 1;
 375              parents;
 376              parents = parents->next, parent_number++) {
 377                 char *name = NULL;
 378
 379                 if (exclude_parent && parent_number != exclude_parent)
 380                         continue;
 381
 382                 if (symbolic)
 383                         name = xstrfmt("%s^%d", arg, parent_number);
 384                 show_rev(include_parents ? NORMAL : REVERSED,
 385                          &parents->item->object.oid, name);
 386                 free(name);
 387         }
 388
 389         *dotdot = '^';
 390         return 1;
 391 }
 392
 393 static int parseopt_dump(const struct option *o, const char *arg, int unset)
 394 {
 395         struct strbuf *parsed = o->value;
 396         if (unset)
 397                 strbuf_addf(parsed, " --no-%s", o->long_name);
 398         else if (o->short_name && (o->long_name == NULL || !stuck_long))
 399                 strbuf_addf(parsed, " -%c", o->short_name);
 400         else
 401                 strbuf_addf(parsed, " --%s", o->long_name);
 402         if (arg) {
 403                 if (!stuck_long)
 404                         strbuf_addch(parsed, ' ');
 405                 else if (o->long_name)
 406                         strbuf_addch(parsed, '=');
 407                 sq_quote_buf(parsed, arg);
 408         }
 409         return 0;
 410 }
 411
 412 static const char *skipspaces(const char *s)
 413 {
 414         while (isspace(*s))
 415                 s++;
 416         return s;
 417 }
 418
 419 static char *findspace(const char *s)
 420 {
 421         for (; *s; s++)
 422                 if (isspace(*s))
 423                         return (char*)s;
 424         return NULL;
 425 }
 426
 427 static int cmd_parseopt(int argc, const char **argv, const char *prefix)
 428 {
 429         int keep_dashdash = 0, stop_at_non_option = 0;
 430         char const * const parseopt_usage[] = {
 431                 N_("git rev-parse --parseopt [<options>] -- [<args>...]"),
 432                 NULL
 433         };
 434         struct option parseopt_opts[] = {
 435                 OPT_BOOL(0, "keep-dashdash", &keep_dashdash,
 436                                         N_("keep the `--` passed as an arg")),
 437                 OPT_BOOL(0, "stop-at-non-option", &stop_at_non_option,
 438                                         N_("stop parsing after the "
 439                                            "first non-option argument")),
 440                 OPT_BOOL(0, "stuck-long", &stuck_long,
 441                                         N_("output in stuck long form")),
 442                 OPT_END(),
 443         };
 444         struct strbuf sb = STRBUF_INIT, parsed = STRBUF_INIT;
 445         struct strvec longnames = STRVEC_INIT;
 446         struct strvec usage = STRVEC_INIT;
 447         struct option *opts = NULL;
 448         size_t opts_nr = 0, opts_alloc = 0;
 449
 450         strbuf_addstr(&parsed, "set --");
 451         argc = parse_options(argc, argv, prefix, parseopt_opts, parseopt_usage,
 452                              PARSE_OPT_KEEP_DASHDASH);
 453         if (argc < 1 || strcmp(argv[0], "--"))
 454                 usage_with_options(parseopt_usage, parseopt_opts);
 455
 456         /* get the usage up to the first line with a -- on it */
 457         for (;;) {
 458                 strbuf_reset(&sb);
 459                 if (strbuf_getline(&sb, stdin) == EOF)
 460                         die(_("premature end of input"));
 461                 if (!strcmp("--", sb.buf)) {
 462                         if (!usage.nr)
 463                                 die(_("no usage string given before the `--' separator"));
 464                         break;
 465                 }
 466
 467                 strvec_push(&usage, sb.buf);
 468         }
 469
 470         /* parse: (<short>|<short>,<long>|<long>)[*=?!]*<arghint>? SP+ <help> */
 471         while (strbuf_getline(&sb, stdin) != EOF) {
 472                 const char *s;
 473                 char *help;
 474                 struct option *o;
 475
 476                 if (!sb.len)
 477                         continue;
 478
 479                 ALLOC_GROW(opts, opts_nr + 1, opts_alloc);
 480                 memset(opts + opts_nr, 0, sizeof(*opts));
 481
 482                 o = &opts[opts_nr++];
 483                 help = findspace(sb.buf);
 484                 if (!help || sb.buf == help) {
 485                         o->type = OPTION_GROUP;
 486                         o->help = xstrdup(skipspaces(sb.buf));
 487                         continue;
 488                 }
 489
 490                 *help = '\0';
 491
 492                 o->type = OPTION_CALLBACK;
 493                 o->help = xstrdup(skipspaces(help+1));
 494                 o->value = &parsed;
 495                 o->flags = PARSE_OPT_NOARG;
 496                 o->callback = &parseopt_dump;
 497
 498                 /* name(s) */
 499                 s = strpbrk(sb.buf, "*=?!");
 500                 if (!s)
 501                         s = help;
 502
 503                 if (s == sb.buf)
 504                         die(_("missing opt-spec before option flags"));
 505
 506                 if (s - sb.buf == 1) { /* short option only */
 507                         o->short_name = *sb.buf;
 508                 } else if (sb.buf[1] != ',') { /* long option only */
 509                         o->long_name = strvec_pushf(&longnames, "%.*s",
 510                                                     (int)(s - sb.buf), sb.buf);
 511                 } else {
 512                         o->short_name = *sb.buf;
 513                         o->long_name = strvec_pushf(&longnames, "%.*s",
 514                                                     (int)(s - sb.buf - 2), sb.buf + 2);
 515                 }
 516
 517                 /* flags */
 518                 while (s < help) {
 519                         switch (*s++) {
 520                         case '=':
 521                                 o->flags &= ~PARSE_OPT_NOARG;
 522                                 continue;
 523                         case '?':
 524                                 o->flags &= ~PARSE_OPT_NOARG;
 525                                 o->flags |= PARSE_OPT_OPTARG;
 526                                 continue;
 527                         case '!':
 528                                 o->flags |= PARSE_OPT_NONEG;
 529                                 continue;
 530                         case '*':
 531                                 o->flags |= PARSE_OPT_HIDDEN;
 532                                 continue;
 533                         }
 534                         s--;
 535                         break;
 536                 }
 537
 538                 if (s < help)
 539                         o->argh = xmemdupz(s, help - s);
 540         }
 541         strbuf_release(&sb);
 542
 543         /* put an OPT_END() */
 544         ALLOC_GROW(opts, opts_nr + 1, opts_alloc);
 545         memset(opts + opts_nr, 0, sizeof(*opts));
 546         argc = parse_options(argc, argv, prefix, opts, usage.v,
 547                         (keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0) |
 548                         (stop_at_non_option ? PARSE_OPT_STOP_AT_NON_OPTION : 0) |
 549                         PARSE_OPT_SHELL_EVAL);
 550
 551         strbuf_addstr(&parsed, " --");
 552         sq_quote_argv(&parsed, argv);
 553         puts(parsed.buf);
 554
 555         strbuf_release(&parsed);
 556         strbuf_release(&sb);
 557         strvec_clear(&longnames);
 558         strvec_clear(&usage);
 559         for (size_t i = 0; i < opts_nr; i++) {
 560                 free((char *) opts[i].help);
 561                 free((char *) opts[i].argh);
 562         }
 563         free(opts);
 564         return 0;
 565 }
 566
 567 static int cmd_sq_quote(int argc, const char **argv)
 568 {
 569         struct strbuf buf = STRBUF_INIT;
 570
 571         if (argc)
 572                 sq_quote_argv(&buf, argv);
 573         printf("%s\n", buf.buf);
 574         strbuf_release(&buf);
 575
 576         return 0;
 577 }
 578
 579 static void die_no_single_rev(int quiet)
 580 {
 581         if (quiet)
 582                 exit(1);
 583         else
 584                 die(_("Needed a single revision"));
 585 }
 586
 587 static const char builtin_rev_parse_usage[] =
 588 N_("git rev-parse --parseopt [<options>] -- [<args>...]\n"
 589    "   or: git rev-parse --sq-quote [<arg>...]\n"
 590    "   or: git rev-parse [<options>] [<arg>...]\n"
 591    "\n"
 592    "Run \"git rev-parse --parseopt -h\" for more information on the first usage.");
 593
 594 /*
 595  * Parse "opt" or "opt=<value>", setting value respectively to either
 596  * NULL or the string after "=".
 597  */
 598 static int opt_with_value(const char *arg, const char *opt, const char **value)
 599 {
 600         if (skip_prefix(arg, opt, &arg)) {
 601                 if (!*arg) {
 602                         *value = NULL;
 603                         return 1;
 604                 }
 605                 if (*arg++ == '=') {
 606                         *value = arg;
 607                         return 1;
 608                 }
 609         }
 610         return 0;
 611 }
 612
 613 static void handle_ref_opt(const char *pattern, const char *prefix)
 614 {
 615         if (pattern)
 616                 refs_for_each_glob_ref_in(get_main_ref_store(the_repository),
 617                                           show_reference, pattern, prefix,
 618                                           NULL);
 619         else
 620                 refs_for_each_ref_in(get_main_ref_store(the_repository),
 621                                      prefix, show_reference, NULL);
 622         clear_ref_exclusions(&ref_excludes);
 623 }
 624
 625 enum format_type {
 626         /* We would like a relative path. */
 627         FORMAT_RELATIVE,
 628         /* We would like a canonical absolute path. */
 629         FORMAT_CANONICAL,
 630         /* We would like the default behavior. */
 631         FORMAT_DEFAULT,
 632 };
 633
 634 enum default_type {
 635         /* Our default is a relative path. */
 636         DEFAULT_RELATIVE,
 637         /* Our default is a relative path if there's a shared root. */
 638         DEFAULT_RELATIVE_IF_SHARED,
 639         /* Our default is a canonical absolute path. */
 640         DEFAULT_CANONICAL,
 641         /* Our default is not to modify the item. */
 642         DEFAULT_UNMODIFIED,
 643 };
 644
 645 static void print_path(const char *path, const char *prefix, enum format_type format, enum default_type def)
 646 {
 647         char *cwd = NULL;
 648         /*
 649          * We don't ever produce a relative path if prefix is NULL, so set the
 650          * prefix to the current directory so that we can produce a relative
 651          * path whenever possible.  If we're using RELATIVE_IF_SHARED mode, then
 652          * we want an absolute path unless the two share a common prefix, so don't
 653          * set it in that case, since doing so causes a relative path to always
 654          * be produced if possible.
 655          */
 656         if (!prefix && (format != FORMAT_DEFAULT || def != DEFAULT_RELATIVE_IF_SHARED))
 657                 prefix = cwd = xgetcwd();
 658         if (format == FORMAT_DEFAULT && def == DEFAULT_UNMODIFIED) {
 659                 puts(path);
 660         } else if (format == FORMAT_RELATIVE ||
 661                   (format == FORMAT_DEFAULT && def == DEFAULT_RELATIVE)) {
 662                 /*
 663                  * In order for relative_path to work as expected, we need to
 664                  * make sure that both paths are absolute paths.  If we don't,
 665                  * we can end up with an unexpected absolute path that the user
 666                  * didn't want.
 667                  */
 668                 struct strbuf buf = STRBUF_INIT, realbuf = STRBUF_INIT, prefixbuf = STRBUF_INIT;
 669                 if (!is_absolute_path(path)) {
 670                         strbuf_realpath_forgiving(&realbuf, path,  1);
 671                         path = realbuf.buf;
 672                 }
 673                 if (!is_absolute_path(prefix)) {
 674                         strbuf_realpath_forgiving(&prefixbuf, prefix, 1);
 675                         prefix = prefixbuf.buf;
 676                 }
 677                 puts(relative_path(path, prefix, &buf));
 678                 strbuf_release(&buf);
 679                 strbuf_release(&realbuf);
 680                 strbuf_release(&prefixbuf);
 681         } else if (format == FORMAT_DEFAULT && def == DEFAULT_RELATIVE_IF_SHARED) {
 682                 struct strbuf buf = STRBUF_INIT;
 683                 puts(relative_path(path, prefix, &buf));
 684                 strbuf_release(&buf);
 685         } else {
 686                 struct strbuf buf = STRBUF_INIT;
 687                 strbuf_realpath_forgiving(&buf, path, 1);
 688                 puts(buf.buf);
 689                 strbuf_release(&buf);
 690         }
 691         free(cwd);
 692 }
 693
 694 int cmd_rev_parse(int argc,
 695                   const char **argv,
 696                   const char *prefix,
 697                   struct repository *repo UNUSED)
 698 {
 699         int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
 700         const struct git_hash_algo *output_algo = NULL;
 701         const struct git_hash_algo *compat = NULL;
 702         int did_repo_setup = 0;
 703         int has_dashdash = 0;
 704         int output_prefix = 0;
 705         struct object_id oid;
 706         unsigned int flags = 0;
 707         const char *name = NULL;
 708         struct object_context unused;
 709         struct strbuf buf = STRBUF_INIT;
 710         int seen_end_of_options = 0;
 711         enum format_type format = FORMAT_DEFAULT;
 712
 713         if (argc > 1 && !strcmp("--parseopt", argv[1]))
 714                 return cmd_parseopt(argc - 1, argv + 1, prefix);
 715
 716         if (argc > 1 && !strcmp("--sq-quote", argv[1]))
 717                 return cmd_sq_quote(argc - 2, argv + 2);
 718
 719         if (argc > 1 && !strcmp("-h", argv[1]))
 720                 usage(builtin_rev_parse_usage);
 721
 722         for (i = 1; i < argc; i++) {
 723                 if (!strcmp(argv[i], "--")) {
 724                         has_dashdash = 1;
 725                         break;
 726                 }
 727         }
 728
 729         /* No options; just report on whether we're in a git repo or not. */
 730         if (argc == 1) {
 731                 setup_git_directory();
 732                 git_config(git_default_config, NULL);
 733                 return 0;
 734         }
 735
 736         for (i = 1; i < argc; i++) {
 737                 const char *arg = argv[i];
 738
 739                 if (as_is) {
 740                         if (show_file(arg, output_prefix) && as_is < 2)
 741                                 verify_filename(prefix, arg, 0);
 742                         continue;
 743                 }
 744
 745                 if (!seen_end_of_options) {
 746                         if (!strcmp(arg, "--local-env-vars")) {
 747                                 int i;
 748                                 for (i = 0; local_repo_env[i]; i++)
 749                                         printf("%s\n", local_repo_env[i]);
 750                                 continue;
 751                         }
 752                         if (!strcmp(arg, "--resolve-git-dir")) {
 753                                 const char *gitdir = argv[++i];
 754                                 if (!gitdir)
 755                                         die(_("--resolve-git-dir requires an argument"));
 756                                 gitdir = resolve_gitdir(gitdir);
 757                                 if (!gitdir)
 758                                         die(_("not a gitdir '%s'"), argv[i]);
 759                                 puts(gitdir);
 760                                 continue;
 761                         }
 762                 }
 763
 764                 /* The rest of the options require a git repository. */
 765                 if (!did_repo_setup) {
 766                         prefix = setup_git_directory();
 767                         git_config(git_default_config, NULL);
 768                         did_repo_setup = 1;
 769
 770                         prepare_repo_settings(the_repository);
 771                         the_repository->settings.command_requires_full_index = 0;
 772                         compat = the_repository->compat_hash_algo;
 773                 }
 774
 775                 if (!strcmp(arg, "--")) {
 776                         as_is = 2;
 777                         /* Pass on the "--" if we show anything but files.. */
 778                         if (filter & (DO_FLAGS | DO_REVS))
 779                                 show_file(arg, 0);
 780                         continue;
 781                 }
 782
 783                 if (!seen_end_of_options && *arg == '-') {
 784                         if (!strcmp(arg, "--git-path")) {
 785                                 if (!argv[i + 1])
 786                                         die(_("--git-path requires an argument"));
 787                                 strbuf_reset(&buf);
 788                                 print_path(git_path("%s", argv[i + 1]), prefix,
 789                                                 format,
 790                                                 DEFAULT_RELATIVE_IF_SHARED);
 791                                 i++;
 792                                 continue;
 793                         }
 794                         if (!strcmp(arg,"-n")) {
 795                                 if (++i >= argc)
 796                                         die(_("-n requires an argument"));
 797                                 if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
 798                                         show(arg);
 799                                         show(argv[i]);
 800                                 }
 801                                 continue;
 802                         }
 803                         if (starts_with(arg, "-n")) {
 804                                 if ((filter & DO_FLAGS) && (filter & DO_REVS))
 805                                         show(arg);
 806                                 continue;
 807                         }
 808                         if (opt_with_value(arg, "--path-format", &arg)) {
 809                                 if (!arg)
 810                                         die(_("--path-format requires an argument"));
 811                                 if (!strcmp(arg, "absolute")) {
 812                                         format = FORMAT_CANONICAL;
 813                                 } else if (!strcmp(arg, "relative")) {
 814                                         format = FORMAT_RELATIVE;
 815                                 } else {
 816                                         die(_("unknown argument to --path-format: %s"), arg);
 817                                 }
 818                                 continue;
 819                         }
 820                         if (!strcmp(arg, "--default")) {
 821                                 def = argv[++i];
 822                                 if (!def)
 823                                         die(_("--default requires an argument"));
 824                                 continue;
 825                         }
 826                         if (!strcmp(arg, "--prefix")) {
 827                                 prefix = argv[++i];
 828                                 if (!prefix)
 829                                         die(_("--prefix requires an argument"));
 830                                 startup_info->prefix = prefix;
 831                                 output_prefix = 1;
 832                                 continue;
 833                         }
 834                         if (!strcmp(arg, "--revs-only")) {
 835                                 filter &= ~DO_NOREV;
 836                                 continue;
 837                         }
 838                         if (!strcmp(arg, "--no-revs")) {
 839                                 filter &= ~DO_REVS;
 840                                 continue;
 841                         }
 842                         if (!strcmp(arg, "--flags")) {
 843                                 filter &= ~DO_NONFLAGS;
 844                                 continue;
 845                         }
 846                         if (!strcmp(arg, "--no-flags")) {
 847                                 filter &= ~DO_FLAGS;
 848                                 continue;
 849                         }
 850                         if (!strcmp(arg, "--verify")) {
 851                                 filter &= ~(DO_FLAGS|DO_NOREV);
 852                                 verify = 1;
 853                                 continue;
 854                         }
 855                         if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
 856                                 quiet = 1;
 857                                 flags |= GET_OID_QUIETLY;
 858                                 continue;
 859                         }
 860                         if (opt_with_value(arg, "--output-object-format", &arg)) {
 861                                 if (!arg)
 862                                         die(_("no object format specified"));
 863                                 if (!strcmp(arg, the_hash_algo->name) ||
 864                                     !strcmp(arg, "storage")) {
 865                                         flags |= GET_OID_HASH_ANY;
 866                                         output_algo = the_hash_algo;
 867                                         continue;
 868                                 }
 869                                 else if (compat && !strcmp(arg, compat->name)) {
 870                                         flags |= GET_OID_HASH_ANY;
 871                                         output_algo = compat;
 872                                         continue;
 873                                 }
 874                                 else die(_("unsupported object format: %s"), arg);
 875                         }
 876                         if (opt_with_value(arg, "--short", &arg)) {
 877                                 filter &= ~(DO_FLAGS|DO_NOREV);
 878                                 verify = 1;
 879                                 abbrev = DEFAULT_ABBREV;
 880                                 if (!arg)
 881                                         continue;
 882                                 abbrev = strtoul(arg, NULL, 10);
 883                                 if (abbrev < MINIMUM_ABBREV)
 884                                         abbrev = MINIMUM_ABBREV;
 885                                 else if ((int)the_hash_algo->hexsz <= abbrev)
 886                                         abbrev = the_hash_algo->hexsz;
 887                                 continue;
 888                         }
 889                         if (!strcmp(arg, "--sq")) {
 890                                 output_sq = 1;
 891                                 continue;
 892                         }
 893                         if (!strcmp(arg, "--not")) {
 894                                 show_type ^= REVERSED;
 895                                 continue;
 896                         }
 897                         if (!strcmp(arg, "--symbolic")) {
 898                                 symbolic = SHOW_SYMBOLIC_ASIS;
 899                                 continue;
 900                         }
 901                         if (!strcmp(arg, "--symbolic-full-name")) {
 902                                 symbolic = SHOW_SYMBOLIC_FULL;
 903                                 continue;
 904                         }
 905                         if (opt_with_value(arg, "--abbrev-ref", &arg)) {
 906                                 abbrev_ref = 1;
 907                                 abbrev_ref_strict =
 908                                         repo_settings_get_warn_ambiguous_refs(the_repository);
 909                                 if (arg) {
 910                                         if (!strcmp(arg, "strict"))
 911                                                 abbrev_ref_strict = 1;
 912                                         else if (!strcmp(arg, "loose"))
 913                                                 abbrev_ref_strict = 0;
 914                                         else
 915                                                 die(_("unknown mode for --abbrev-ref: %s"),
 916                                                     arg);
 917                                 }
 918                                 continue;
 919                         }
 920                         if (!strcmp(arg, "--all")) {
 921                                 refs_for_each_ref(get_main_ref_store(the_repository),
 922                                                   show_reference, NULL);
 923                                 clear_ref_exclusions(&ref_excludes);
 924                                 continue;
 925                         }
 926                         if (skip_prefix(arg, "--disambiguate=", &arg)) {
 927                                 repo_for_each_abbrev(the_repository, arg, the_hash_algo,
 928                                                      show_abbrev, NULL);
 929                                 continue;
 930                         }
 931                         if (!strcmp(arg, "--bisect")) {
 932                                 refs_for_each_fullref_in(get_main_ref_store(the_repository),
 933                                                          "refs/bisect/bad",
 934                                                          NULL, show_reference,
 935                                                          NULL);
 936                                 refs_for_each_fullref_in(get_main_ref_store(the_repository),
 937                                                          "refs/bisect/good",
 938                                                          NULL, anti_reference,
 939                                                          NULL);
 940                                 continue;
 941                         }
 942                         if (opt_with_value(arg, "--branches", &arg)) {
 943                                 if (ref_excludes.hidden_refs_configured)
 944                                         return error(_("options '%s' and '%s' cannot be used together"),
 945                                                      "--exclude-hidden", "--branches");
 946                                 handle_ref_opt(arg, "refs/heads/");
 947                                 continue;
 948                         }
 949                         if (opt_with_value(arg, "--tags", &arg)) {
 950                                 if (ref_excludes.hidden_refs_configured)
 951                                         return error(_("options '%s' and '%s' cannot be used together"),
 952                                                      "--exclude-hidden", "--tags");
 953                                 handle_ref_opt(arg, "refs/tags/");
 954                                 continue;
 955                         }
 956                         if (skip_prefix(arg, "--glob=", &arg)) {
 957                                 handle_ref_opt(arg, NULL);
 958                                 continue;
 959                         }
 960                         if (opt_with_value(arg, "--remotes", &arg)) {
 961                                 if (ref_excludes.hidden_refs_configured)
 962                                         return error(_("options '%s' and '%s' cannot be used together"),
 963                                                      "--exclude-hidden", "--remotes");
 964                                 handle_ref_opt(arg, "refs/remotes/");
 965                                 continue;
 966                         }
 967                         if (skip_prefix(arg, "--exclude=", &arg)) {
 968                                 add_ref_exclusion(&ref_excludes, arg);
 969                                 continue;
 970                         }
 971                         if (skip_prefix(arg, "--exclude-hidden=", &arg)) {
 972                                 exclude_hidden_refs(&ref_excludes, arg);
 973                                 continue;
 974                         }
 975                         if (!strcmp(arg, "--show-toplevel")) {
 976                                 const char *work_tree = repo_get_work_tree(the_repository);
 977                                 if (work_tree)
 978                                         print_path(work_tree, prefix, format, DEFAULT_UNMODIFIED);
 979                                 else
 980                                         die(_("this operation must be run in a work tree"));
 981                                 continue;
 982                         }
 983                         if (!strcmp(arg, "--show-superproject-working-tree")) {
 984                                 struct strbuf superproject = STRBUF_INIT;
 985                                 if (get_superproject_working_tree(&superproject))
 986                                         print_path(superproject.buf, prefix, format, DEFAULT_UNMODIFIED);
 987                                 strbuf_release(&superproject);
 988                                 continue;
 989                         }
 990                         if (!strcmp(arg, "--show-prefix")) {
 991                                 if (prefix)
 992                                         puts(prefix);
 993                                 else
 994                                         putchar('\n');
 995                                 continue;
 996                         }
 997                         if (!strcmp(arg, "--show-cdup")) {
 998                                 const char *pfx = prefix;
 999                                 if (!is_inside_work_tree()) {
1000                                         const char *work_tree =
1001                                                 repo_get_work_tree(the_repository);
1002                                         if (work_tree)
1003                                                 printf("%s\n", work_tree);
1004                                         continue;
1005                                 }
1006                                 while (pfx) {
1007                                         pfx = strchr(pfx, '/');
1008                                         if (pfx) {
1009                                                 pfx++;
1010                                                 printf("../");
1011                                         }
1012                                 }
1013                                 putchar('\n');
1014                                 continue;
1015                         }
1016                         if (!strcmp(arg, "--git-dir") ||
1017                             !strcmp(arg, "--absolute-git-dir")) {
1018                                 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
1019                                 char *cwd;
1020                                 int len;
1021                                 enum format_type wanted = format;
1022                                 if (arg[2] == 'g') {    /* --git-dir */
1023                                         if (gitdir) {
1024                                                 print_path(gitdir, prefix, format, DEFAULT_UNMODIFIED);
1025                                                 continue;
1026                                         }
1027                                         if (!prefix) {
1028                                                 print_path(".git", prefix, format, DEFAULT_UNMODIFIED);
1029                                                 continue;
1030                                         }
1031                                 } else {                /* --absolute-git-dir */
1032                                         wanted = FORMAT_CANONICAL;
1033                                         if (!gitdir && !prefix)
1034                                                 gitdir = ".git";
1035                                         if (gitdir) {
1036                                                 struct strbuf realpath = STRBUF_INIT;
1037                                                 strbuf_realpath(&realpath, gitdir, 1);
1038                                                 puts(realpath.buf);
1039                                                 strbuf_release(&realpath);
1040                                                 continue;
1041                                         }
1042                                 }
1043                                 cwd = xgetcwd();
1044                                 len = strlen(cwd);
1045                                 strbuf_reset(&buf);
1046                                 strbuf_addf(&buf, "%s%s.git", cwd, len && cwd[len-1] != '/' ? "/" : "");
1047                                 free(cwd);
1048                                 print_path(buf.buf, prefix, wanted, DEFAULT_CANONICAL);
1049                                 continue;
1050                         }
1051                         if (!strcmp(arg, "--git-common-dir")) {
1052                                 print_path(repo_get_common_dir(the_repository), prefix, format, DEFAULT_RELATIVE_IF_SHARED);
1053                                 continue;
1054                         }
1055                         if (!strcmp(arg, "--is-inside-git-dir")) {
1056                                 printf("%s\n", is_inside_git_dir() ? "true"
1057                                                 : "false");
1058                                 continue;
1059                         }
1060                         if (!strcmp(arg, "--is-inside-work-tree")) {
1061                                 printf("%s\n", is_inside_work_tree() ? "true"
1062                                                 : "false");
1063                                 continue;
1064                         }
1065                         if (!strcmp(arg, "--is-bare-repository")) {
1066                                 printf("%s\n", is_bare_repository() ? "true"
1067                                                 : "false");
1068                                 continue;
1069                         }
1070                         if (!strcmp(arg, "--is-shallow-repository")) {
1071                                 printf("%s\n",
1072                                                 is_repository_shallow(the_repository) ? "true"
1073                                                 : "false");
1074                                 continue;
1075                         }
1076                         if (!strcmp(arg, "--shared-index-path")) {
1077                                 if (repo_read_index(the_repository) < 0)
1078                                         die(_("Could not read the index"));
1079                                 if (the_repository->index->split_index) {
1080                                         const struct object_id *oid = &the_repository->index->split_index->base_oid;
1081                                         const char *path = git_path("sharedindex.%s", oid_to_hex(oid));
1082                                         print_path(path, prefix, format, DEFAULT_RELATIVE);
1083                                 }
1084                                 continue;
1085                         }
1086                         if (skip_prefix(arg, "--since=", &arg)) {
1087                                 show_datestring("--max-age=", arg);
1088                                 continue;
1089                         }
1090                         if (skip_prefix(arg, "--after=", &arg)) {
1091                                 show_datestring("--max-age=", arg);
1092                                 continue;
1093                         }
1094                         if (skip_prefix(arg, "--before=", &arg)) {
1095                                 show_datestring("--min-age=", arg);
1096                                 continue;
1097                         }
1098                         if (skip_prefix(arg, "--until=", &arg)) {
1099                                 show_datestring("--min-age=", arg);
1100                                 continue;
1101                         }
1102                         if (opt_with_value(arg, "--show-object-format", &arg)) {
1103                                 const char *val = arg ? arg : "storage";
1104
1105                                 if (strcmp(val, "storage") &&
1106                                     strcmp(val, "input") &&
1107                                     strcmp(val, "output"))
1108                                         die(_("unknown mode for --show-object-format: %s"),
1109                                             arg);
1110                                 puts(the_hash_algo->name);
1111                                 continue;
1112                         }
1113                         if (!strcmp(arg, "--show-ref-format")) {
1114                                 puts(ref_storage_format_to_name(the_repository->ref_storage_format));
1115                                 continue;
1116                         }
1117                         if (!strcmp(arg, "--end-of-options")) {
1118                                 seen_end_of_options = 1;
1119                                 if (filter & (DO_FLAGS | DO_REVS))
1120                                         show_file(arg, 0);
1121                                 continue;
1122                         }
1123                         if (show_flag(arg) && verify)
1124                                 die_no_single_rev(quiet);
1125                         continue;
1126                 }
1127
1128                 /* Not a flag argument */
1129                 if (try_difference(arg))
1130                         continue;
1131                 if (try_parent_shorthands(arg))
1132                         continue;
1133                 name = arg;
1134                 type = NORMAL;
1135                 if (*arg == '^') {
1136                         name++;
1137                         type = REVERSED;
1138                 }
1139                 if (!get_oid_with_context(the_repository, name,
1140                                           flags, &oid, &unused)) {
1141                         object_context_release(&unused);
1142                         if (output_algo)
1143                                 repo_oid_to_algop(the_repository, &oid,
1144                                                   output_algo, &oid);
1145                         if (verify)
1146                                 revs_count++;
1147                         else
1148                                 show_rev(type, &oid, name);
1149                         continue;
1150                 }
1151                 object_context_release(&unused);
1152                 if (verify)
1153                         die_no_single_rev(quiet);
1154                 if (has_dashdash)
1155                         die(_("bad revision '%s'"), arg);
1156                 as_is = 1;
1157                 if (!show_file(arg, output_prefix))
1158                         continue;
1159                 verify_filename(prefix, arg, 1);
1160         }
1161         strbuf_release(&buf);
1162         if (verify) {
1163                 if (revs_count == 1) {
1164                         show_rev(type, &oid, name);
1165                         return 0;
1166                 } else if (revs_count == 0 && show_default())
1167                         return 0;
1168                 die_no_single_rev(quiet);
1169         } else
1170                 show_default();
1171         return 0;
1172 }