2 * Copyright (c) 2018, 2019 Stefan Sperling <stsp@openbsd.org>
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 #include <sys/types.h>
18 #include <sys/queue.h>
35 #include "got_error.h"
36 #include "got_object.h"
37 #include "got_repository.h"
38 #include "got_reference.h"
39 #include "got_opentemp.h"
42 #include "got_lib_hash.h"
43 #include "got_lib_delta.h"
44 #include "got_lib_inflate.h"
45 #include "got_lib_object.h"
46 #include "got_lib_object_idset.h"
47 #include "got_lib_lockfile.h"
50 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
53 #define GOT_REF_HEADS "heads"
54 #define GOT_REF_TAGS "tags"
55 #define GOT_REF_REMOTES "remotes"
58 * We do not resolve tags yet, and don't yet care about sorting refs either,
59 * so packed-refs files we write contain a minimal header which disables all
60 * packed-refs "traits" supported by Git.
62 #define GOT_PACKED_REFS_HEADER "# pack-refs with:"
64 /* A symbolic reference. */
70 #define GOT_REF_RECURSE_MAX 20
72 /* A non-symbolic reference (there is no better designation). */
75 struct got_object_id id;
78 /* A reference which points to an arbitrary object. */
79 struct got_reference {
81 #define GOT_REF_IS_SYMBOLIC 0x01
82 #define GOT_REF_IS_PACKED 0x02
86 struct got_symref symref;
89 struct got_lockfile *lf;
92 /* Cached timestamp for got_ref_cmp_by_commit_timestamp_descending() */
93 time_t committer_time;
96 static const struct got_error *
97 alloc_ref(struct got_reference **ref, const char *name,
98 struct got_object_id *id, int flags, time_t mtime)
100 const struct got_error *err = NULL;
102 *ref = calloc(1, sizeof(**ref));
104 return got_error_from_errno("calloc");
106 memcpy(&(*ref)->ref.ref.id, id, sizeof((*ref)->ref.ref.id));
107 (*ref)->flags = flags;
108 (*ref)->ref.ref.name = strdup(name);
109 (*ref)->mtime = mtime;
110 if ((*ref)->ref.ref.name == NULL) {
111 err = got_error_from_errno("strdup");
118 static const struct got_error *
119 alloc_symref(struct got_reference **ref, const char *name,
120 const char *target_ref, int flags)
122 const struct got_error *err = NULL;
124 *ref = calloc(1, sizeof(**ref));
126 return got_error_from_errno("calloc");
128 (*ref)->flags = GOT_REF_IS_SYMBOLIC | flags;
129 (*ref)->ref.symref.name = strdup(name);
130 if ((*ref)->ref.symref.name == NULL) {
131 err = got_error_from_errno("strdup");
136 (*ref)->ref.symref.ref = strdup(target_ref);
137 if ((*ref)->ref.symref.ref == NULL) {
138 err = got_error_from_errno("strdup");
145 static const struct got_error *
146 parse_symref(struct got_reference **ref, const char *name, const char *line)
149 return got_error(GOT_ERR_BAD_REF_DATA);
151 return alloc_symref(ref, name, line, 0);
154 static const struct got_error *
155 parse_ref_line(struct got_reference **ref, const char *name, const char *line,
156 time_t mtime, enum got_hash_algorithm algo)
158 struct got_object_id id;
160 if (strncmp(line, "ref: ", 5) == 0) {
162 return parse_symref(ref, name, line);
165 memset(&id, 0, sizeof(id));
167 if (!got_parse_hash_digest(id.hash, line, algo))
168 return got_error(GOT_ERR_BAD_REF_DATA);
170 return alloc_ref(ref, name, &id, 0, mtime);
173 static const struct got_error *
174 parse_ref_file(struct got_reference **ref, const char *name,
175 const char *absname, const char *abspath, int lock,
176 enum got_hash_algorithm algo)
178 const struct got_error *err = NULL;
183 struct got_lockfile *lf = NULL;
187 err = got_lockfile_lock(&lf, abspath, -1);
189 if (err->code == GOT_ERR_ERRNO && errno == ENOENT)
190 err = got_error_not_ref(name);
195 f = fopen(abspath, "rbe");
197 if (errno != ENOTDIR && errno != ENOENT)
198 err = got_error_from_errno2("fopen", abspath);
200 err = got_error_not_ref(name);
202 got_lockfile_unlock(lf, -1);
205 if (fstat(fileno(f), &sb) == -1) {
206 err = got_error_from_errno2("fstat", abspath);
210 linelen = getline(&line, &linesize, f);
213 err = NULL; /* ignore empty files (could be locks) */
216 err = got_error(GOT_ERR_NOT_REF);
218 err = got_ferror(f, GOT_ERR_IO);
220 err = got_error_from_errno2("getline", abspath);
223 got_lockfile_unlock(lf, -1);
226 while (linelen > 0 && line[linelen - 1] == '\n') {
227 line[linelen - 1] = '\0';
231 err = parse_ref_line(ref, absname, line, sb.st_mtime, algo);
234 got_lockfile_unlock(lf, -1);
239 got_lockfile_unlock(lf, -1);
244 if (fclose(f) == EOF && err == NULL) {
245 err = got_error_from_errno("fclose");
248 got_ref_unlock(*ref);
257 is_well_known_ref(const char *refname)
259 return (strcmp(refname, GOT_REF_HEAD) == 0 ||
260 strcmp(refname, GOT_REF_ORIG_HEAD) == 0 ||
261 strcmp(refname, GOT_REF_MERGE_HEAD) == 0 ||
262 strcmp(refname, GOT_REF_FETCH_HEAD) == 0);
266 get_refs_dir_path(struct got_repository *repo, const char *refname)
268 if (is_well_known_ref(refname) || strncmp(refname, "refs/", 5) == 0)
269 return strdup(got_repo_get_path_git_dir(repo));
271 return got_repo_get_path_refs(repo);
274 const struct got_error *
275 got_ref_alloc(struct got_reference **ref, const char *name,
276 struct got_object_id *id)
278 if (!got_ref_name_is_valid(name))
279 return got_error_path(name, GOT_ERR_BAD_REF_NAME);
281 return alloc_ref(ref, name, id, 0, 0);
284 const struct got_error *
285 got_ref_alloc_symref(struct got_reference **ref, const char *name,
286 struct got_reference *target_ref)
288 if (!got_ref_name_is_valid(name))
289 return got_error_path(name, GOT_ERR_BAD_REF_NAME);
291 return alloc_symref(ref, name, got_ref_get_name(target_ref), 0);
294 static const struct got_error *
295 parse_packed_ref_line(struct got_reference **ref, const char *abs_refname,
296 const char *line, time_t mtime, enum got_hash_algorithm algo)
298 struct got_object_id id;
303 if (line[0] == '#' || line[0] == '^')
306 memset(&id, 0, sizeof(id));
308 if (!got_parse_hash_digest(id.hash, line, algo))
309 return got_error(GOT_ERR_BAD_REF_DATA);
312 if (strcmp(line + SHA1_DIGEST_STRING_LENGTH, abs_refname) != 0)
316 name = line + SHA1_DIGEST_STRING_LENGTH;
318 return alloc_ref(ref, name, &id, GOT_REF_IS_PACKED, mtime);
321 static const struct got_error *
322 open_packed_ref(struct got_reference **ref, FILE *f, const char **subdirs,
323 int nsubdirs, const char *refname, time_t mtime,
324 enum got_hash_algorithm algo)
326 const struct got_error *err = NULL;
331 int i, ref_is_absolute = (strncmp(refname, "refs/", 5) == 0);
336 abs_refname = (char *)refname;
338 linelen = getline(&line, &linesize, f);
342 err = got_ferror(f, GOT_ERR_BAD_REF_DATA);
345 if (linelen > 0 && line[linelen - 1] == '\n')
346 line[linelen - 1] = '\0';
347 for (i = 0; i < nsubdirs; i++) {
348 if (!ref_is_absolute &&
349 asprintf(&abs_refname, "refs/%s/%s", subdirs[i],
351 return got_error_from_errno("asprintf");
352 err = parse_packed_ref_line(ref, abs_refname, line,
354 if (!ref_is_absolute)
356 if (err || *ref != NULL)
361 } while (*ref == NULL);
367 static const struct got_error *
368 open_ref(struct got_reference **ref, const char *path_refs, const char *subdir,
369 const char *name, int lock, enum got_hash_algorithm algo)
371 const struct got_error *err = NULL;
373 char *absname = NULL;
374 int ref_is_absolute = (strncmp(name, "refs/", 5) == 0);
375 int ref_is_well_known = (subdir[0] == '\0' && is_well_known_ref(name));
379 if (!got_ref_name_is_valid(name))
380 return got_error_path(name, GOT_ERR_BAD_REF_NAME);
382 if (ref_is_absolute || ref_is_well_known) {
383 if (asprintf(&path, "%s/%s", path_refs, name) == -1)
384 return got_error_from_errno("asprintf");
385 absname = (char *)name;
387 if (asprintf(&path, "%s/%s%s%s", path_refs, subdir,
388 subdir[0] ? "/" : "", name) == -1)
389 return got_error_from_errno("asprintf");
391 if (asprintf(&absname, "refs/%s%s%s",
392 subdir, subdir[0] ? "/" : "", name) == -1) {
393 err = got_error_from_errno("asprintf");
398 err = parse_ref_file(ref, name, absname, path, lock, algo);
400 if (!ref_is_absolute && !ref_is_well_known)
406 const struct got_error *
407 got_ref_open(struct got_reference **ref, struct got_repository *repo,
408 const char *refname, int lock)
410 const struct got_error *err = NULL;
411 char *packed_refs_path = NULL, *path_refs = NULL;
412 const char *subdirs[] = {
413 GOT_REF_HEADS, GOT_REF_TAGS, GOT_REF_REMOTES
416 int well_known = is_well_known_ref(refname);
417 struct got_lockfile *lf = NULL;
421 path_refs = get_refs_dir_path(repo, refname);
422 if (path_refs == NULL) {
423 err = got_error_from_errno2("get_refs_dir_path", refname);
428 err = open_ref(ref, path_refs, "", refname, lock,
429 got_repo_get_object_format(repo));
433 /* Search on-disk refs before packed refs! */
434 for (i = 0; i < nitems(subdirs); i++) {
435 err = open_ref(ref, path_refs, subdirs[i], refname,
436 lock, got_repo_get_object_format(repo));
437 if ((err && err->code != GOT_ERR_NOT_REF) || *ref)
441 packed_refs_path = got_repo_get_path_packed_refs(repo);
442 if (packed_refs_path == NULL) {
443 err = got_error_from_errno(
444 "got_repo_get_path_packed_refs");
449 err = got_lockfile_lock(&lf, packed_refs_path, -1);
453 f = fopen(packed_refs_path, "rbe");
456 if (fstat(fileno(f), &sb) == -1) {
457 err = got_error_from_errno2("fstat",
461 err = open_packed_ref(ref, f, subdirs, nitems(subdirs),
462 refname, sb.st_mtime,
463 got_repo_get_object_format(repo));
465 if (fclose(f) == EOF) {
466 err = got_error_from_errno("fclose");
475 if (!err && *ref == NULL)
476 err = got_error_not_ref(refname);
478 got_lockfile_unlock(lf, -1);
479 free(packed_refs_path);
485 got_ref_close(struct got_reference *ref)
487 if (ref->flags & GOT_REF_IS_SYMBOLIC) {
488 free(ref->ref.symref.name);
489 free(ref->ref.symref.ref);
491 free(ref->ref.ref.name);
495 struct got_reference *
496 got_ref_dup(struct got_reference *ref)
498 struct got_reference *ret;
500 ret = calloc(1, sizeof(*ret));
504 ret->flags = ref->flags;
505 if (ref->flags & GOT_REF_IS_SYMBOLIC) {
506 ret->ref.symref.name = strdup(ref->ref.symref.name);
507 if (ret->ref.symref.name == NULL) {
511 ret->ref.symref.ref = strdup(ref->ref.symref.ref);
512 if (ret->ref.symref.ref == NULL) {
513 free(ret->ref.symref.name);
518 ret->ref.ref.name = strdup(ref->ref.ref.name);
519 if (ret->ref.ref.name == NULL) {
523 memcpy(&ret->ref.ref.id, &ref->ref.ref.id,
524 sizeof(ret->ref.ref.id));
530 const struct got_error *
531 got_reflist_entry_dup(struct got_reflist_entry **newp,
532 struct got_reflist_entry *re)
534 const struct got_error *err = NULL;
535 struct got_reflist_entry *new;
539 new = malloc(sizeof(*new));
541 return got_error_from_errno("malloc");
543 new->ref = got_ref_dup(re->ref);
544 if (new->ref == NULL) {
545 err = got_error_from_errno("got_ref_dup");
554 const struct got_error *
555 got_ref_resolve_symbolic(struct got_reference **resolved,
556 struct got_repository *repo, struct got_reference *ref)
558 struct got_reference *nextref;
559 const struct got_error *err;
561 err = got_ref_open(&nextref, repo, ref->ref.symref.ref, 0);
565 if (nextref->flags & GOT_REF_IS_SYMBOLIC)
566 err = got_ref_resolve_symbolic(resolved, repo, nextref);
568 *resolved = got_ref_dup(nextref);
570 got_ref_close(nextref);
574 static const struct got_error *
575 ref_resolve(struct got_object_id **id, struct got_repository *repo,
576 struct got_reference *ref, int recursion)
578 const struct got_error *err;
581 return got_error_msg(GOT_ERR_RECURSION,
582 "reference recursion limit reached");
584 if (ref->flags & GOT_REF_IS_SYMBOLIC) {
585 struct got_reference *resolved = NULL;
586 err = got_ref_resolve_symbolic(&resolved, repo, ref);
588 err = ref_resolve(id, repo, resolved, --recursion);
590 got_ref_close(resolved);
594 *id = calloc(1, sizeof(**id));
596 return got_error_from_errno("calloc");
597 memcpy(*id, &ref->ref.ref.id, sizeof(**id));
602 const struct got_error *
603 got_ref_resolve(struct got_object_id **id, struct got_repository *repo,
604 struct got_reference *ref)
606 return ref_resolve(id, repo, ref, GOT_REF_RECURSE_MAX);
610 got_ref_to_str(struct got_reference *ref)
614 if (ref->flags & GOT_REF_IS_SYMBOLIC)
615 return strdup(ref->ref.symref.ref);
617 if (got_object_id_str(&str, &ref->ref.ref.id) != NULL)
624 got_ref_get_name(struct got_reference *ref)
626 if (ref->flags & GOT_REF_IS_SYMBOLIC)
627 return ref->ref.symref.name;
629 return ref->ref.ref.name;
633 got_ref_get_symref_target(struct got_reference *ref)
635 if (ref->flags & GOT_REF_IS_SYMBOLIC)
636 return ref->ref.symref.ref;
642 got_ref_get_mtime(struct got_reference *ref)
647 const struct got_error *
648 got_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
649 struct got_reference* re2)
651 const char *name1 = got_ref_get_name(re1);
652 const char *name2 = got_ref_get_name(re2);
654 *cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
658 const struct got_error *
659 got_ref_cmp_tags(void *arg, int *cmp, struct got_reference *ref1,
660 struct got_reference *ref2)
662 const struct got_error *err = NULL;
663 struct got_repository *repo = arg;
664 struct got_object_id *id1, *id2 = NULL;
665 struct got_tag_object *tag1 = NULL, *tag2 = NULL;
666 struct got_commit_object *commit1 = NULL, *commit2 = NULL;
671 err = got_ref_resolve(&id1, repo, ref1);
674 err = got_object_open_as_tag(&tag1, repo, id1);
676 if (err->code != GOT_ERR_OBJ_TYPE)
678 /* "lightweight" tag */
679 err = got_object_open_as_commit(&commit1, repo, id1);
682 time1 = got_object_commit_get_committer_time(commit1);
684 time1 = got_object_tag_get_tagger_time(tag1);
686 err = got_ref_resolve(&id2, repo, ref2);
689 err = got_object_open_as_tag(&tag2, repo, id2);
691 if (err->code != GOT_ERR_OBJ_TYPE)
693 /* "lightweight" tag */
694 err = got_object_open_as_commit(&commit2, repo, id2);
697 time2 = got_object_commit_get_committer_time(commit2);
699 time2 = got_object_tag_get_tagger_time(tag2);
701 /* Put latest tags first. */
704 else if (time1 > time2)
707 err = got_ref_cmp_by_name(NULL, cmp, ref2, ref1);
712 got_object_tag_close(tag1);
714 got_object_tag_close(tag2);
716 got_object_commit_close(commit1);
718 got_object_commit_close(commit2);
722 static const struct got_error *
723 get_committer_time(struct got_reference *ref, struct got_repository *repo)
725 const struct got_error *err = NULL;
727 struct got_commit_object *commit = NULL;
728 struct got_tag_object *tag = NULL;
729 struct got_object_id *id = NULL;
731 err = got_ref_resolve(&id, repo, ref);
735 err = got_object_get_type(&obj_type, repo, id);
740 case GOT_OBJ_TYPE_COMMIT:
741 err = got_object_open_as_commit(&commit, repo, id);
744 ref->committer_time =
745 got_object_commit_get_committer_time(commit);
747 case GOT_OBJ_TYPE_TAG:
748 err = got_object_open_as_tag(&tag, repo, id);
751 ref->committer_time = got_object_tag_get_tagger_time(tag);
754 /* best effort for other object types */
755 ref->committer_time = got_ref_get_mtime(ref);
761 got_object_commit_close(commit);
763 got_object_tag_close(tag);
767 const struct got_error *
768 got_ref_cmp_by_commit_timestamp_descending(void *arg, int *cmp,
769 struct got_reference *ref1, struct got_reference *ref2)
771 const struct got_error *err = NULL;
772 struct got_repository *repo = arg;
776 if (ref1->committer_time == 0) {
777 err = get_committer_time(ref1, repo);
781 if (ref2->committer_time == 0) {
782 err = get_committer_time(ref2, repo);
787 if (ref1->committer_time < ref2->committer_time)
789 else if (ref2->committer_time < ref1->committer_time)
792 return got_ref_cmp_by_name(arg, cmp, ref1, ref2);
797 const struct got_error *
798 got_reflist_insert(struct got_reflist_entry **newp,
799 struct got_reflist_head *refs, struct got_reference *ref,
800 got_ref_cmp_cb cmp_cb, void *cmp_arg)
802 const struct got_error *err;
803 struct got_reflist_entry *new, *re;
808 if (cmp_cb != got_ref_cmp_by_name && (ref->flags & GOT_REF_IS_PACKED)) {
810 * If we are not sorting elements by name then we must still
811 * detect collisions between a packed ref and an on-disk ref
812 * using the same name. On-disk refs take precedence and are
813 * already present on the list before packed refs get added.
815 TAILQ_FOREACH(re, refs, entry) {
816 err = got_ref_cmp_by_name(NULL, &cmp, re->ref, ref);
824 new = malloc(sizeof(*new));
826 return got_error_from_errno("malloc");
831 * We must de-duplicate entries on insert because packed-refs may
832 * contain redundant entries. On-disk refs take precedence.
833 * This code assumes that on-disk revs are read before packed-refs.
834 * We're iterating the list anyway, so insert elements sorted by name.
836 * Many callers will provide paths in a somewhat sorted order.
837 * Iterating backwards from the tail of the list should be more
838 * efficient than traversing through the entire list each time
839 * an element is inserted.
841 re = TAILQ_LAST(refs, got_reflist_head);
843 err = (*cmp_cb)(cmp_arg, &cmp, re->ref, new->ref);
851 } else if (cmp < 0) {
852 TAILQ_INSERT_AFTER(refs, re, new, entry);
855 re = TAILQ_PREV(re, got_reflist_head, entry);
858 TAILQ_INSERT_HEAD(refs, new, entry);
862 const struct got_error *
863 got_reflist_sort(struct got_reflist_head *refs,
864 got_ref_cmp_cb cmp_cb, void *cmp_arg)
866 const struct got_error *err = NULL;
867 struct got_reflist_entry *re, *tmp, *new;
868 struct got_reflist_head sorted;
872 TAILQ_FOREACH_SAFE(re, refs, entry, tmp) {
873 struct got_reference *ref = re->ref;
874 TAILQ_REMOVE(refs, re, entry);
876 err = got_reflist_insert(&new, &sorted, ref, cmp_cb, cmp_arg);
877 if (err || new == NULL /* duplicate */)
883 TAILQ_CONCAT(refs, &sorted, entry);
887 static const struct got_error *
888 gather_on_disk_refs(struct got_reflist_head *refs, const char *path_refs,
889 const char *subdir, struct got_repository *repo,
890 got_ref_cmp_cb cmp_cb, void *cmp_arg)
892 const struct got_error *err = NULL;
896 while (subdir[0] == '/')
899 if (asprintf(&path_subdir, "%s/%s", path_refs, subdir) == -1)
900 return got_error_from_errno("asprintf");
902 d = opendir(path_subdir);
908 struct got_reference *ref;
916 if (strcmp(dent->d_name, ".") == 0 ||
917 strcmp(dent->d_name, "..") == 0)
920 err = got_path_dirent_type(&type, path_subdir, dent);
926 err = open_ref(&ref, path_refs, subdir, dent->d_name,
927 0, got_repo_get_object_format(repo));
931 struct got_reflist_entry *new;
932 err = got_reflist_insert(&new, refs, ref,
934 if (err || new == NULL /* duplicate */)
941 if (asprintf(&child, "%s%s%s", subdir,
942 subdir[0] == '\0' ? "" : "/", dent->d_name) == -1) {
943 err = got_error_from_errno("asprintf");
946 err = gather_on_disk_refs(refs, path_refs, child, repo,
961 const struct got_error *
962 got_ref_list(struct got_reflist_head *refs, struct got_repository *repo,
963 const char *ref_namespace, got_ref_cmp_cb cmp_cb, void *cmp_arg)
965 const struct got_error *err;
966 char *packed_refs_path = NULL, *path_refs = NULL;
967 char *abs_namespace = NULL, *buf = NULL;
968 const char *ondisk_ref_namespace = NULL;
971 struct got_reference *ref;
972 struct got_reflist_entry *new;
974 if (ref_namespace == NULL || ref_namespace[0] == '\0') {
975 path_refs = get_refs_dir_path(repo, GOT_REF_HEAD);
976 if (path_refs == NULL) {
977 err = got_error_from_errno("get_refs_dir_path");
980 err = open_ref(&ref, path_refs, "", GOT_REF_HEAD, 0,
981 got_repo_get_object_format(repo));
984 err = got_reflist_insert(&new, refs, ref, cmp_cb, cmp_arg);
985 if (err || new == NULL /* duplicate */)
987 if (err && err->code != GOT_ERR_NOT_REF)
990 /* Try listing a single reference. */
991 const char *refname = ref_namespace;
992 path_refs = get_refs_dir_path(repo, refname);
993 if (path_refs == NULL) {
994 err = got_error_from_errno("get_refs_dir_path");
997 err = open_ref(&ref, path_refs, "", refname, 0,
998 got_repo_get_object_format(repo));
1000 if (err->code != GOT_ERR_NOT_REF)
1002 /* Try to look up references in a given namespace. */
1004 err = got_reflist_insert(&new, refs, ref,
1006 if (err || new == NULL /* duplicate */)
1012 if (ref_namespace) {
1014 /* Canonicalize the path to eliminate double-slashes if any. */
1015 if (asprintf(&abs_namespace, "/%s", ref_namespace) == -1) {
1016 err = got_error_from_errno("asprintf");
1019 len = strlen(abs_namespace) + 1;
1022 err = got_error_from_errno("malloc");
1025 err = got_canonpath(abs_namespace, buf, len);
1028 ondisk_ref_namespace = buf;
1029 while (ondisk_ref_namespace[0] == '/')
1030 ondisk_ref_namespace++;
1031 if (strncmp(ondisk_ref_namespace, "refs/", 5) == 0)
1032 ondisk_ref_namespace += 5;
1033 else if (strcmp(ondisk_ref_namespace, "refs") == 0)
1034 ondisk_ref_namespace = "";
1037 /* Gather on-disk refs before parsing packed-refs. */
1039 path_refs = get_refs_dir_path(repo, "");
1040 if (path_refs == NULL) {
1041 err = got_error_from_errno("get_refs_dir_path");
1044 err = gather_on_disk_refs(refs, path_refs,
1045 ondisk_ref_namespace ? ondisk_ref_namespace : "", repo,
1051 * The packed-refs file may contain redundant entries, in which
1052 * case on-disk refs take precedence.
1054 packed_refs_path = got_repo_get_path_packed_refs(repo);
1055 if (packed_refs_path == NULL) {
1056 err = got_error_from_errno("got_repo_get_path_packed_refs");
1060 f = fopen(packed_refs_path, "re");
1062 size_t linesize = 0;
1066 if (fstat(fileno(f), &sb) == -1) {
1067 err = got_error_from_errno2("fstat", packed_refs_path);
1071 linelen = getline(&line, &linesize, f);
1072 if (linelen == -1) {
1075 err = got_ferror(f, GOT_ERR_BAD_REF_DATA);
1078 if (linelen > 0 && line[linelen - 1] == '\n')
1079 line[linelen - 1] = '\0';
1080 err = parse_packed_ref_line(&ref, NULL, line,
1081 sb.st_mtime, got_repo_get_object_format(repo));
1085 if (ref_namespace) {
1087 name = got_ref_get_name(ref);
1088 if (!got_path_is_child(name,
1090 strlen(ref_namespace))) {
1095 err = got_reflist_insert(&new, refs, ref,
1097 if (err || new == NULL /* duplicate */)
1105 free(packed_refs_path);
1106 free(abs_namespace);
1110 if (f && fclose(f) == EOF && err == NULL)
1111 err = got_error_from_errno("fclose");
1116 got_ref_list_free(struct got_reflist_head *refs)
1118 struct got_reflist_entry *re;
1120 while ((re = TAILQ_FIRST(refs))) {
1121 TAILQ_REMOVE(refs, re, entry);
1122 got_ref_close(re->ref);
1128 got_ref_is_symbolic(struct got_reference *ref)
1130 return (ref->flags & GOT_REF_IS_SYMBOLIC);
1133 const struct got_error *
1134 got_ref_change_ref(struct got_reference *ref, struct got_object_id *id)
1136 if (ref->flags & GOT_REF_IS_SYMBOLIC)
1137 return got_error(GOT_ERR_BAD_REF_TYPE);
1139 memcpy(&ref->ref.ref.id, id, sizeof(ref->ref.ref.id));
1143 const struct got_error *
1144 got_ref_change_symref(struct got_reference *ref, const char *refname)
1148 if ((ref->flags & GOT_REF_IS_SYMBOLIC) == 0)
1149 return got_error(GOT_ERR_BAD_REF_TYPE);
1151 new_name = strdup(refname);
1152 if (new_name == NULL)
1153 return got_error_from_errno("strdup");
1155 free(ref->ref.symref.ref);
1156 ref->ref.symref.ref = new_name;
1160 const struct got_error *
1161 got_ref_change_symref_to_ref(struct got_reference *symref,
1162 struct got_object_id *id)
1164 if ((symref->flags & GOT_REF_IS_SYMBOLIC) == 0)
1165 return got_error(GOT_ERR_BAD_REF_TYPE);
1167 symref->ref.ref.name = symref->ref.symref.name;
1168 memcpy(&symref->ref.ref.id, id, sizeof(symref->ref.ref.id));
1169 symref->flags &= ~GOT_REF_IS_SYMBOLIC;
1173 const struct got_error *
1174 got_ref_write(struct got_reference *ref, struct got_repository *repo)
1176 const struct got_error *err = NULL, *unlock_err = NULL;
1177 const char *name = got_ref_get_name(ref);
1178 char *path_refs = NULL, *path = NULL, *tmppath = NULL;
1179 struct got_lockfile *lf = NULL;
1184 path_refs = get_refs_dir_path(repo, name);
1185 if (path_refs == NULL) {
1186 err = got_error_from_errno2("get_refs_dir_path", name);
1190 if (asprintf(&path, "%s/%s", path_refs, name) == -1) {
1191 err = got_error_from_errno("asprintf");
1195 err = got_opentemp_named(&tmppath, &f, path, "");
1198 if (!(err->code == GOT_ERR_ERRNO && errno == ENOENT))
1200 err = got_path_dirname(&parent, path);
1203 err = got_path_mkdir(parent);
1207 err = got_opentemp_named(&tmppath, &f, path, "");
1212 if (ref->flags & GOT_REF_IS_SYMBOLIC) {
1213 n = fprintf(f, "ref: %s\n", ref->ref.symref.ref);
1214 if (n != strlen(ref->ref.symref.ref) + 6) {
1215 err = got_ferror(f, GOT_ERR_IO);
1222 err = got_object_id_str(&hex, &ref->ref.ref.id);
1226 n = fprintf(f, "%s\n", hex);
1229 err = got_ferror(f, GOT_ERR_IO);
1234 if (ref->lf == NULL) {
1235 err = got_lockfile_lock(&lf, path, -1);
1240 /* XXX: check if old content matches our expectations? */
1242 if (stat(path, &sb) != 0) {
1243 if (errno != ENOENT) {
1244 err = got_error_from_errno2("stat", path);
1247 sb.st_mode = GOT_DEFAULT_FILE_MODE;
1250 if (fchmod(fileno(f), sb.st_mode) != 0) {
1251 err = got_error_from_errno2("fchmod", tmppath);
1255 if (rename(tmppath, path) != 0) {
1256 err = got_error_from_errno3("rename", tmppath, path);
1262 if (stat(path, &sb) == -1) {
1263 err = got_error_from_errno2("stat", path);
1266 ref->mtime = sb.st_mtime;
1268 if (ref->lf == NULL && lf)
1269 unlock_err = got_lockfile_unlock(lf, -1);
1271 if (fclose(f) == EOF && err == NULL)
1272 err = got_error_from_errno("fclose");
1277 if (unlink(tmppath) == -1 && err == NULL)
1278 err = got_error_from_errno2("unlink", tmppath);
1281 return err ? err : unlock_err;
1284 static const struct got_error *
1285 delete_packed_ref(struct got_reference *delref, struct got_repository *repo)
1287 const struct got_error *err = NULL, *unlock_err = NULL;
1288 struct got_lockfile *lf = NULL;
1289 FILE *f = NULL, *tmpf = NULL;
1290 char *line = NULL, *packed_refs_path, *tmppath = NULL;
1291 size_t linesize = 0;
1292 struct got_reflist_head refs;
1293 int found_delref = 0;
1295 /* The packed-refs file does not cotain symbolic references. */
1296 if (delref->flags & GOT_REF_IS_SYMBOLIC)
1297 return got_error(GOT_ERR_BAD_REF_DATA);
1301 packed_refs_path = got_repo_get_path_packed_refs(repo);
1302 if (packed_refs_path == NULL)
1303 return got_error_from_errno("got_repo_get_path_packed_refs");
1305 err = got_opentemp_named(&tmppath, &tmpf, packed_refs_path, "");
1309 if (delref->lf == NULL) {
1310 err = got_lockfile_lock(&lf, packed_refs_path, -1);
1315 f = fopen(packed_refs_path, "re");
1317 err = got_error_from_errno2("fopen", packed_refs_path);
1322 struct got_reference *ref;
1323 struct got_reflist_entry *new;
1325 linelen = getline(&line, &linesize, f);
1326 if (linelen == -1) {
1329 err = got_ferror(f, GOT_ERR_BAD_REF_DATA);
1332 if (linelen > 0 && line[linelen - 1] == '\n')
1333 line[linelen - 1] = '\0';
1334 err = parse_packed_ref_line(&ref, NULL, line, 0,
1335 got_repo_get_object_format(repo));
1341 if (strcmp(ref->ref.ref.name, delref->ref.ref.name) == 0 &&
1342 got_object_id_cmp(&ref->ref.ref.id,
1343 &delref->ref.ref.id) == 0) {
1349 err = got_reflist_insert(&new, &refs, ref,
1350 got_ref_cmp_by_name, NULL);
1351 if (err || new == NULL /* duplicate */)
1358 struct got_reflist_entry *re;
1362 n = fprintf(tmpf, "%s\n", GOT_PACKED_REFS_HEADER);
1363 if (n != sizeof(GOT_PACKED_REFS_HEADER)) {
1364 err = got_ferror(f, GOT_ERR_IO);
1368 TAILQ_FOREACH(re, &refs, entry) {
1372 err = got_object_id_str(&hex, &re->ref->ref.ref.id);
1376 n = fprintf(tmpf, "%s ", hex);
1379 err = got_ferror(f, GOT_ERR_IO);
1383 n = fprintf(tmpf, "%s\n", re->ref->ref.ref.name);
1384 if (n != strlen(re->ref->ref.ref.name) + 1) {
1385 err = got_ferror(f, GOT_ERR_IO);
1390 if (fflush(tmpf) != 0) {
1391 err = got_error_from_errno("fflush");
1395 if (fstat(fileno(f), &sb) != 0) {
1396 if (errno != ENOENT) {
1397 err = got_error_from_errno2("fstat",
1401 sb.st_mode = GOT_DEFAULT_FILE_MODE;
1404 if (fchmod(fileno(tmpf), sb.st_mode) != 0) {
1405 err = got_error_from_errno2("fchmod", tmppath);
1409 if (rename(tmppath, packed_refs_path) != 0) {
1410 err = got_error_from_errno3("rename", tmppath,
1418 if (delref->lf == NULL && lf)
1419 unlock_err = got_lockfile_unlock(lf, -1);
1421 if (fclose(f) == EOF && err == NULL)
1422 err = got_error_from_errno("fclose");
1424 if (tmppath && unlink(tmppath) == -1 && err == NULL)
1425 err = got_error_from_errno2("unlink", tmppath);
1426 if (tmpf && fclose(tmpf) == EOF && err == NULL)
1427 err = got_error_from_errno("fclose");
1429 free(packed_refs_path);
1431 got_ref_list_free(&refs);
1432 return err ? err : unlock_err;
1435 static const struct got_error *
1436 delete_loose_ref(struct got_reference *ref, struct got_repository *repo)
1438 const struct got_error *err = NULL, *unlock_err = NULL;
1439 const char *name = got_ref_get_name(ref);
1440 char *path_refs = NULL, *path = NULL;
1441 struct got_lockfile *lf = NULL;
1443 path_refs = get_refs_dir_path(repo, name);
1444 if (path_refs == NULL) {
1445 err = got_error_from_errno2("get_refs_dir_path", name);
1449 if (asprintf(&path, "%s/%s", path_refs, name) == -1) {
1450 err = got_error_from_errno("asprintf");
1454 if (ref->lf == NULL) {
1455 err = got_lockfile_lock(&lf, path, -1);
1460 /* XXX: check if old content matches our expectations? */
1462 if (unlink(path) == -1)
1463 err = got_error_from_errno2("unlink", path);
1465 if (ref->lf == NULL && lf)
1466 unlock_err = got_lockfile_unlock(lf, -1);
1470 return err ? err : unlock_err;
1473 const struct got_error *
1474 got_ref_delete(struct got_reference *ref, struct got_repository *repo)
1476 const struct got_error *err = NULL;
1477 struct got_reference *ref2;
1479 if (ref->flags & GOT_REF_IS_PACKED) {
1480 err = delete_packed_ref(ref, repo);
1484 err = got_ref_open(&ref2, repo, got_ref_get_name(ref), 0);
1486 if (err->code == GOT_ERR_NOT_REF)
1491 err = delete_loose_ref(ref2, repo);
1492 got_ref_close(ref2);
1495 err = delete_loose_ref(ref, repo);
1499 err = got_ref_open(&ref2, repo, got_ref_get_name(ref), 0);
1501 if (err->code == GOT_ERR_NOT_REF)
1506 err = delete_packed_ref(ref2, repo);
1507 got_ref_close(ref2);
1512 const struct got_error *
1513 got_ref_unlock(struct got_reference *ref)
1515 const struct got_error *err;
1516 err = got_lockfile_unlock(ref->lf, -1);
1521 struct got_reflist_object_id_map {
1522 struct got_object_idset *idset;
1525 struct got_reflist_object_id_map_entry {
1526 struct got_reflist_head refs;
1529 static const struct got_error *
1530 add_object_id_map_entry(struct got_object_idset *idset,
1531 struct got_object_id *id, struct got_reflist_entry *re)
1533 const struct got_error *err = NULL;
1534 struct got_reflist_object_id_map_entry *ent;
1535 struct got_reflist_entry *new;
1537 ent = got_object_idset_get(idset, id);
1539 ent = malloc(sizeof(*ent));
1541 return got_error_from_errno("malloc");
1543 TAILQ_INIT(&ent->refs);
1544 err = got_object_idset_add(idset, id, ent);
1551 err = got_reflist_entry_dup(&new, re);
1555 TAILQ_INSERT_TAIL(&ent->refs, new, entry);
1559 const struct got_error *
1560 got_reflist_object_id_map_create(struct got_reflist_object_id_map **map,
1561 struct got_reflist_head *refs, struct got_repository *repo)
1563 const struct got_error *err = NULL;
1564 struct got_object_idset *idset;
1565 struct got_object_id *id = NULL;
1566 struct got_reflist_entry *re;
1568 idset = got_object_idset_alloc();
1570 return got_error_from_errno("got_object_idset_alloc");
1572 *map = malloc(sizeof(**map));
1574 got_object_idset_free(idset);
1575 return got_error_from_errno("malloc");
1577 (*map)->idset = idset;
1579 TAILQ_FOREACH(re, refs, entry) {
1580 struct got_tag_object *tag = NULL;
1582 err = got_ref_resolve(&id, repo, re->ref);
1586 err = add_object_id_map_entry(idset, id, re);
1590 if (strstr(got_ref_get_name(re->ref), "/tags/") == NULL) {
1596 err = got_object_open_as_tag(&tag, repo, id);
1598 if (err->code != GOT_ERR_OBJ_TYPE)
1600 /* Ref points at something other than a tag. */
1608 err = add_object_id_map_entry(idset,
1609 got_object_tag_get_object_id(tag), re);
1610 got_object_tag_close(tag);
1620 got_reflist_object_id_map_free(*map);
1626 struct got_reflist_head *
1627 got_reflist_object_id_map_lookup(struct got_reflist_object_id_map *map,
1628 struct got_object_id *id)
1630 struct got_reflist_object_id_map_entry *ent;
1631 ent = got_object_idset_get(map->idset, id);
1637 static const struct got_error *
1638 free_id_map_entry(struct got_object_id *id, void *data, void *arg)
1640 struct got_reflist_object_id_map_entry *ent = data;
1642 got_ref_list_free(&ent->refs);
1648 got_reflist_object_id_map_free(struct got_reflist_object_id_map *map)
1650 got_object_idset_for_each(map->idset, free_id_map_entry, NULL);
1651 got_object_idset_free(map->idset);