builtin/rev-parse.c

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