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