builtin/rev-parse.c

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