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