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