builtin/rev-parse.c

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