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