builtin/rev-parse.c

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