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