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