builtin/rev-parse.c

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