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