]>
git.proxmox.com Git - libgit2.git/blob - src/revparse.c
2 * Copyright (C) the libgit2 contributors. All rights reserved.
4 * This file is part of libgit2, distributed under the GNU GPL v2 with
5 * a Linking Exception. For full terms see the included COPYING file.
17 static int maybe_sha_or_abbrev(git_object
** out
, git_repository
*repo
, const char *spec
, size_t speclen
)
21 if (git_oid_fromstrn(&oid
, spec
, speclen
) < 0)
24 return git_object_lookup_prefix(out
, repo
, &oid
, speclen
, GIT_OBJ_ANY
);
27 static int maybe_sha(git_object
** out
, git_repository
*repo
, const char *spec
)
29 size_t speclen
= strlen(spec
);
31 if (speclen
!= GIT_OID_HEXSZ
)
34 return maybe_sha_or_abbrev(out
, repo
, spec
, speclen
);
37 static int maybe_abbrev(git_object
** out
, git_repository
*repo
, const char *spec
)
39 size_t speclen
= strlen(spec
);
41 return maybe_sha_or_abbrev(out
, repo
, spec
, speclen
);
44 static int build_regex(regex_t
*regex
, const char *pattern
)
48 if (*pattern
== '\0') {
49 giterr_set(GITERR_REGEX
, "empty pattern");
50 return GIT_EINVALIDSPEC
;
53 error
= p_regcomp(regex
, pattern
, REG_EXTENDED
);
57 error
= giterr_set_regex(regex
, error
);
64 static int maybe_describe(git_object
**out
, git_repository
*repo
, const char *spec
)
70 substr
= strstr(spec
, "-g");
75 if (build_regex(®ex
, ".+-[0-9]+-g[0-9a-fA-F]+") < 0)
78 error
= regexec(®ex
, spec
, 0, NULL
, 0);
84 return maybe_abbrev(out
, repo
, substr
+2);
87 static int revparse_lookup_object(
88 git_object
**object_out
,
89 git_reference
**reference_out
,
96 if ((error
= maybe_sha(object_out
, repo
, spec
)) != GIT_ENOTFOUND
)
99 error
= git_reference_dwim(&ref
, repo
, spec
);
102 error
= git_object_lookup(
103 object_out
, repo
, git_reference_target(ref
), GIT_OBJ_ANY
);
106 *reference_out
= ref
;
111 if (error
!= GIT_ENOTFOUND
)
114 if ((strlen(spec
) < GIT_OID_HEXSZ
) &&
115 ((error
= maybe_abbrev(object_out
, repo
, spec
)) != GIT_ENOTFOUND
))
118 if ((error
= maybe_describe(object_out
, repo
, spec
)) != GIT_ENOTFOUND
)
121 giterr_set(GITERR_REFERENCE
, "revspec '%s' not found", spec
);
122 return GIT_ENOTFOUND
;
125 static int try_parse_numeric(int *n
, const char *curly_braces_content
)
130 if (git__strtol32(&content
, curly_braces_content
, &end_ptr
, 10) < 0)
133 if (*end_ptr
!= '\0')
140 static int retrieve_previously_checked_out_branch_or_revision(git_object
**out
, git_reference
**base_ref
, git_repository
*repo
, const char *identifier
, size_t position
)
142 git_reference
*ref
= NULL
;
143 git_reflog
*reflog
= NULL
;
146 size_t i
, numentries
, cur
;
147 const git_reflog_entry
*entry
;
149 regmatch_t regexmatches
[2];
150 git_buf buf
= GIT_BUF_INIT
;
154 if (*identifier
!= '\0' || *base_ref
!= NULL
)
155 return GIT_EINVALIDSPEC
;
157 if (build_regex(&preg
, "checkout: moving from (.*) to .*") < 0)
160 if (git_reference_lookup(&ref
, repo
, GIT_HEAD_FILE
) < 0)
163 if (git_reflog_read(&reflog
, repo
, GIT_HEAD_FILE
) < 0)
166 numentries
= git_reflog_entrycount(reflog
);
168 for (i
= 0; i
< numentries
; i
++) {
169 entry
= git_reflog_entry_byindex(reflog
, i
);
170 msg
= git_reflog_entry_message(entry
);
174 if (regexec(&preg
, msg
, 2, regexmatches
, 0))
182 git_buf_put(&buf
, msg
+regexmatches
[1].rm_so
, regexmatches
[1].rm_eo
- regexmatches
[1].rm_so
);
184 if ((error
= git_reference_dwim(base_ref
, repo
, git_buf_cstr(&buf
))) == 0)
187 if (error
< 0 && error
!= GIT_ENOTFOUND
)
190 error
= maybe_abbrev(out
, repo
, git_buf_cstr(&buf
));
195 error
= GIT_ENOTFOUND
;
198 git_reference_free(ref
);
201 git_reflog_free(reflog
);
205 static int retrieve_oid_from_reflog(git_oid
*oid
, git_reference
*ref
, size_t identifier
)
209 const git_reflog_entry
*entry
;
210 bool search_by_pos
= (identifier
<= 100000000);
212 if (git_reflog_read(&reflog
, git_reference_owner(ref
), git_reference_name(ref
)) < 0)
215 numentries
= git_reflog_entrycount(reflog
);
218 if (numentries
< identifier
+ 1)
221 entry
= git_reflog_entry_byindex(reflog
, identifier
);
222 git_oid_cpy(oid
, git_reflog_entry_id_new(entry
));
225 git_time commit_time
;
227 for (i
= 0; i
< numentries
; i
++) {
228 entry
= git_reflog_entry_byindex(reflog
, i
);
229 commit_time
= git_reflog_entry_committer(entry
)->when
;
231 if (commit_time
.time
> (git_time_t
)identifier
)
234 git_oid_cpy(oid
, git_reflog_entry_id_new(entry
));
242 git_reflog_free(reflog
);
248 "reflog for '%s' has only %"PRIuZ
" entries, asked for %"PRIuZ
,
249 git_reference_name(ref
), numentries
, identifier
);
251 git_reflog_free(reflog
);
252 return GIT_ENOTFOUND
;
255 static int retrieve_revobject_from_reflog(git_object
**out
, git_reference
**base_ref
, git_repository
*repo
, const char *identifier
, size_t position
)
261 if (*base_ref
== NULL
) {
262 if ((error
= git_reference_dwim(&ref
, repo
, identifier
)) < 0)
270 error
= git_object_lookup(out
, repo
, git_reference_target(ref
), GIT_OBJ_ANY
);
274 if ((error
= retrieve_oid_from_reflog(&oid
, ref
, position
)) < 0)
277 error
= git_object_lookup(out
, repo
, &oid
, GIT_OBJ_ANY
);
280 git_reference_free(ref
);
284 static int retrieve_remote_tracking_reference(git_reference
**base_ref
, const char *identifier
, git_repository
*repo
)
286 git_reference
*tracking
, *ref
;
289 if (*base_ref
== NULL
) {
290 if ((error
= git_reference_dwim(&ref
, repo
, identifier
)) < 0)
297 if (!git_reference_is_branch(ref
)) {
298 error
= GIT_EINVALIDSPEC
;
302 if ((error
= git_branch_upstream(&tracking
, ref
)) < 0)
305 *base_ref
= tracking
;
308 git_reference_free(ref
);
312 static int handle_at_syntax(git_object
**out
, git_reference
**ref
, const char *spec
, size_t identifier_len
, git_repository
* repo
, const char *curly_braces_content
)
315 int parsed
= 0, error
= -1;
316 git_buf identifier
= GIT_BUF_INIT
;
317 git_time_t timestamp
;
319 assert(*out
== NULL
);
321 if (git_buf_put(&identifier
, spec
, identifier_len
) < 0)
324 is_numeric
= !try_parse_numeric(&parsed
, curly_braces_content
);
326 if (*curly_braces_content
== '-' && (!is_numeric
|| parsed
== 0)) {
327 error
= GIT_EINVALIDSPEC
;
333 error
= retrieve_previously_checked_out_branch_or_revision(out
, ref
, repo
, git_buf_cstr(&identifier
), -parsed
);
335 error
= retrieve_revobject_from_reflog(out
, ref
, repo
, git_buf_cstr(&identifier
), parsed
);
340 if (!strcmp(curly_braces_content
, "u") || !strcmp(curly_braces_content
, "upstream")) {
341 error
= retrieve_remote_tracking_reference(ref
, git_buf_cstr(&identifier
), repo
);
346 if (git__date_parse(×tamp
, curly_braces_content
) < 0)
349 error
= retrieve_revobject_from_reflog(out
, ref
, repo
, git_buf_cstr(&identifier
), (size_t)timestamp
);
352 git_buf_free(&identifier
);
356 static git_otype
parse_obj_type(const char *str
)
358 if (!strcmp(str
, "commit"))
359 return GIT_OBJ_COMMIT
;
361 if (!strcmp(str
, "tree"))
364 if (!strcmp(str
, "blob"))
367 if (!strcmp(str
, "tag"))
373 static int dereference_to_non_tag(git_object
**out
, git_object
*obj
)
375 if (git_object_type(obj
) == GIT_OBJ_TAG
)
376 return git_tag_peel(out
, (git_tag
*)obj
);
378 return git_object_dup(out
, obj
);
381 static int handle_caret_parent_syntax(git_object
**out
, git_object
*obj
, int n
)
383 git_object
*temp_commit
= NULL
;
386 if ((error
= git_object_peel(&temp_commit
, obj
, GIT_OBJ_COMMIT
)) < 0)
387 return (error
== GIT_EAMBIGUOUS
|| error
== GIT_ENOTFOUND
) ?
388 GIT_EINVALIDSPEC
: error
;
395 error
= git_commit_parent((git_commit
**)out
, (git_commit
*)temp_commit
, n
- 1);
397 git_object_free(temp_commit
);
401 static int handle_linear_syntax(git_object
**out
, git_object
*obj
, int n
)
403 git_object
*temp_commit
= NULL
;
406 if ((error
= git_object_peel(&temp_commit
, obj
, GIT_OBJ_COMMIT
)) < 0)
407 return (error
== GIT_EAMBIGUOUS
|| error
== GIT_ENOTFOUND
) ?
408 GIT_EINVALIDSPEC
: error
;
410 error
= git_commit_nth_gen_ancestor((git_commit
**)out
, (git_commit
*)temp_commit
, n
);
412 git_object_free(temp_commit
);
416 static int handle_colon_syntax(
423 git_tree_entry
*entry
= NULL
;
425 if ((error
= git_object_peel(&tree
, obj
, GIT_OBJ_TREE
)) < 0)
426 return error
== GIT_ENOTFOUND
? GIT_EINVALIDSPEC
: error
;
434 * TODO: Handle the relative path syntax
435 * (:./relative/path and :../relative/path)
437 if ((error
= git_tree_entry_bypath(&entry
, (git_tree
*)tree
, path
)) < 0)
440 error
= git_tree_entry_to_object(out
, git_object_owner(tree
), entry
);
443 git_tree_entry_free(entry
);
444 git_object_free(tree
);
449 static int walk_and_search(git_object
**out
, git_revwalk
*walk
, regex_t
*regex
)
455 while (!(error
= git_revwalk_next(&oid
, walk
))) {
457 error
= git_object_lookup(&obj
, git_revwalk_repository(walk
), &oid
, GIT_OBJ_COMMIT
);
458 if ((error
< 0) && (error
!= GIT_ENOTFOUND
))
461 if (!regexec(regex
, git_commit_message((git_commit
*)obj
), 0, NULL
, 0)) {
466 git_object_free(obj
);
469 if (error
< 0 && error
== GIT_ITEROVER
)
470 error
= GIT_ENOTFOUND
;
475 static int handle_grep_syntax(git_object
**out
, git_repository
*repo
, const git_oid
*spec_oid
, const char *pattern
)
478 git_revwalk
*walk
= NULL
;
481 if ((error
= build_regex(&preg
, pattern
)) < 0)
484 if ((error
= git_revwalk_new(&walk
, repo
)) < 0)
487 git_revwalk_sorting(walk
, GIT_SORT_TIME
);
489 if (spec_oid
== NULL
) {
490 if ((error
= git_revwalk_push_glob(walk
, "refs/*")) < 0)
492 } else if ((error
= git_revwalk_push(walk
, spec_oid
)) < 0)
495 error
= walk_and_search(out
, walk
, &preg
);
499 git_revwalk_free(walk
);
504 static int handle_caret_curly_syntax(git_object
**out
, git_object
*obj
, const char *curly_braces_content
)
506 git_otype expected_type
;
508 if (*curly_braces_content
== '\0')
509 return dereference_to_non_tag(out
, obj
);
511 if (*curly_braces_content
== '/')
512 return handle_grep_syntax(out
, git_object_owner(obj
), git_object_id(obj
), curly_braces_content
+ 1);
514 expected_type
= parse_obj_type(curly_braces_content
);
516 if (expected_type
== GIT_OBJ_BAD
)
517 return GIT_EINVALIDSPEC
;
519 return git_object_peel(out
, obj
, expected_type
);
522 static int extract_curly_braces_content(git_buf
*buf
, const char *spec
, size_t *pos
)
526 assert(spec
[*pos
] == '^' || spec
[*pos
] == '@');
530 if (spec
[*pos
] == '\0' || spec
[*pos
] != '{')
531 return GIT_EINVALIDSPEC
;
535 while (spec
[*pos
] != '}') {
536 if (spec
[*pos
] == '\0')
537 return GIT_EINVALIDSPEC
;
539 git_buf_putc(buf
, spec
[(*pos
)++]);
547 static int extract_path(git_buf
*buf
, const char *spec
, size_t *pos
)
551 assert(spec
[*pos
] == ':');
555 if (git_buf_puts(buf
, spec
+ *pos
) < 0)
558 *pos
+= git_buf_len(buf
);
563 static int extract_how_many(int *n
, const char *spec
, size_t *pos
)
566 int parsed
, accumulated
;
567 char kind
= spec
[*pos
];
569 assert(spec
[*pos
] == '^' || spec
[*pos
] == '~');
577 } while (spec
[(*pos
)] == kind
&& kind
== '~');
579 if (git__isdigit(spec
[*pos
])) {
580 if (git__strtol32(&parsed
, spec
+ *pos
, &end_ptr
, 10) < 0)
581 return GIT_EINVALIDSPEC
;
583 accumulated
+= (parsed
- 1);
584 *pos
= end_ptr
- spec
;
587 } while (spec
[(*pos
)] == kind
&& kind
== '~');
594 static int object_from_reference(git_object
**object
, git_reference
*reference
)
596 git_reference
*resolved
= NULL
;
599 if (git_reference_resolve(&resolved
, reference
) < 0)
602 error
= git_object_lookup(object
, reference
->db
->repo
, git_reference_target(resolved
), GIT_OBJ_ANY
);
603 git_reference_free(resolved
);
608 static int ensure_base_rev_loaded(git_object
**object
, git_reference
**reference
, const char *spec
, size_t identifier_len
, git_repository
*repo
, bool allow_empty_identifier
)
611 git_buf identifier
= GIT_BUF_INIT
;
616 if (*reference
!= NULL
)
617 return object_from_reference(object
, *reference
);
619 if (!allow_empty_identifier
&& identifier_len
== 0)
620 return GIT_EINVALIDSPEC
;
622 if (git_buf_put(&identifier
, spec
, identifier_len
) < 0)
625 error
= revparse_lookup_object(object
, reference
, repo
, git_buf_cstr(&identifier
));
626 git_buf_free(&identifier
);
631 static int ensure_base_rev_is_not_known_yet(git_object
*object
)
636 return GIT_EINVALIDSPEC
;
639 static bool any_left_hand_identifier(git_object
*object
, git_reference
*reference
, size_t identifier_len
)
644 if (reference
!= NULL
)
647 if (identifier_len
> 0)
653 static int ensure_left_hand_identifier_is_not_known_yet(git_object
*object
, git_reference
*reference
)
655 if (!ensure_base_rev_is_not_known_yet(object
) && reference
== NULL
)
658 return GIT_EINVALIDSPEC
;
662 git_object
**object_out
,
663 git_reference
**reference_out
,
664 size_t *identifier_len_out
,
665 git_repository
*repo
,
668 size_t pos
= 0, identifier_len
= 0;
670 git_buf buf
= GIT_BUF_INIT
;
672 git_reference
*reference
= NULL
;
673 git_object
*base_rev
= NULL
;
675 bool should_return_reference
= true;
677 assert(object_out
&& reference_out
&& repo
&& spec
);
680 *reference_out
= NULL
;
685 should_return_reference
= false;
687 if ((error
= ensure_base_rev_loaded(&base_rev
, &reference
, spec
, identifier_len
, repo
, false)) < 0)
690 if (spec
[pos
+1] == '{') {
691 git_object
*temp_object
= NULL
;
693 if ((error
= extract_curly_braces_content(&buf
, spec
, &pos
)) < 0)
696 if ((error
= handle_caret_curly_syntax(&temp_object
, base_rev
, git_buf_cstr(&buf
))) < 0)
699 git_object_free(base_rev
);
700 base_rev
= temp_object
;
702 git_object
*temp_object
= NULL
;
704 if ((error
= extract_how_many(&n
, spec
, &pos
)) < 0)
707 if ((error
= handle_caret_parent_syntax(&temp_object
, base_rev
, n
)) < 0)
710 git_object_free(base_rev
);
711 base_rev
= temp_object
;
717 git_object
*temp_object
= NULL
;
719 should_return_reference
= false;
721 if ((error
= extract_how_many(&n
, spec
, &pos
)) < 0)
724 if ((error
= ensure_base_rev_loaded(&base_rev
, &reference
, spec
, identifier_len
, repo
, false)) < 0)
727 if ((error
= handle_linear_syntax(&temp_object
, base_rev
, n
)) < 0)
730 git_object_free(base_rev
);
731 base_rev
= temp_object
;
737 git_object
*temp_object
= NULL
;
739 should_return_reference
= false;
741 if ((error
= extract_path(&buf
, spec
, &pos
)) < 0)
744 if (any_left_hand_identifier(base_rev
, reference
, identifier_len
)) {
745 if ((error
= ensure_base_rev_loaded(&base_rev
, &reference
, spec
, identifier_len
, repo
, true)) < 0)
748 if ((error
= handle_colon_syntax(&temp_object
, base_rev
, git_buf_cstr(&buf
))) < 0)
751 if (*git_buf_cstr(&buf
) == '/') {
752 if ((error
= handle_grep_syntax(&temp_object
, repo
, NULL
, git_buf_cstr(&buf
) + 1)) < 0)
757 * TODO: support merge-stage path lookup (":2:Makefile")
758 * and plain index blob lookup (:i-am/a/blob)
760 giterr_set(GITERR_INVALID
, "unimplemented");
766 git_object_free(base_rev
);
767 base_rev
= temp_object
;
773 if (spec
[pos
+1] == '{') {
774 git_object
*temp_object
= NULL
;
776 if ((error
= extract_curly_braces_content(&buf
, spec
, &pos
)) < 0)
779 if ((error
= ensure_base_rev_is_not_known_yet(base_rev
)) < 0)
782 if ((error
= handle_at_syntax(&temp_object
, &reference
, spec
, identifier_len
, repo
, git_buf_cstr(&buf
))) < 0)
785 if (temp_object
!= NULL
)
786 base_rev
= temp_object
;
794 if ((error
= ensure_left_hand_identifier_is_not_known_yet(base_rev
, reference
)) < 0)
802 if ((error
= ensure_base_rev_loaded(&base_rev
, &reference
, spec
, identifier_len
, repo
, false)) < 0)
805 if (!should_return_reference
) {
806 git_reference_free(reference
);
810 *object_out
= base_rev
;
811 *reference_out
= reference
;
812 *identifier_len_out
= identifier_len
;
817 if (error
== GIT_EINVALIDSPEC
)
818 giterr_set(GITERR_INVALID
,
819 "failed to parse revision specifier - Invalid pattern '%s'", spec
);
821 git_object_free(base_rev
);
822 git_reference_free(reference
);
829 int git_revparse_ext(
830 git_object
**object_out
,
831 git_reference
**reference_out
,
832 git_repository
*repo
,
836 size_t identifier_len
;
837 git_object
*obj
= NULL
;
838 git_reference
*ref
= NULL
;
840 if ((error
= revparse__ext(&obj
, &ref
, &identifier_len
, repo
, spec
)) < 0)
844 *reference_out
= ref
;
845 GIT_UNUSED(identifier_len
);
850 git_object_free(obj
);
851 git_reference_free(ref
);
855 int git_revparse_single(git_object
**out
, git_repository
*repo
, const char *spec
)
858 git_object
*obj
= NULL
;
859 git_reference
*ref
= NULL
;
863 if ((error
= git_revparse_ext(&obj
, &ref
, repo
, spec
)) < 0)
866 git_reference_free(ref
);
873 git_object_free(obj
);
874 git_reference_free(ref
);
879 git_revspec
*revspec
,
880 git_repository
*repo
,
886 assert(revspec
&& repo
&& spec
);
888 memset(revspec
, 0x0, sizeof(*revspec
));
890 if ((dotdot
= strstr(spec
, "..")) != NULL
) {
893 revspec
->flags
= GIT_REVPARSE_RANGE
;
896 * Following git.git, don't allow '..' because it makes command line
897 * arguments which can be either paths or revisions ambiguous when the
898 * path is almost certainly intended. The empty range '...' is still
901 if (!git__strcmp(spec
, "..")) {
902 giterr_set(GITERR_INVALID
, "Invalid pattern '..'");
903 return GIT_EINVALIDSPEC
;
906 lstr
= git__substrdup(spec
, dotdot
- spec
);
908 if (dotdot
[2] == '.') {
909 revspec
->flags
|= GIT_REVPARSE_MERGE_BASE
;
913 error
= git_revparse_single(
916 *lstr
== '\0' ? "HEAD" : lstr
);
919 error
= git_revparse_single(
922 *rstr
== '\0' ? "HEAD" : rstr
);
925 git__free((void*)lstr
);
927 revspec
->flags
= GIT_REVPARSE_SINGLE
;
928 error
= git_revparse_single(&revspec
->from
, repo
, spec
);