builtin/rev-parse.c

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