[libgit2.git] / src / libgit2 / refdb.c

/*
 * Copyright (C) the libgit2 contributors. All rights reserved.
 *
 * This file is part of libgit2, distributed under the GNU GPL v2 with
 * a Linking Exception. For full terms see the included COPYING file.
 */

#include "refdb.h"

#include "git2/object.h"
#include "git2/refs.h"
#include "git2/refdb.h"
#include "git2/sys/refdb_backend.h"

#include "hash.h"
#include "refs.h"
#include "reflog.h"
#include "posix.h"

#define DEFAULT_NESTING_LEVEL	5
#define MAX_NESTING_LEVEL		10

int git_refdb_new(git_refdb **out, git_repository *repo)
{
	git_refdb *db;

	GIT_ASSERT_ARG(out);
	GIT_ASSERT_ARG(repo);

	db = git__calloc(1, sizeof(*db));
	GIT_ERROR_CHECK_ALLOC(db);

	db->repo = repo;

	*out = db;
	GIT_REFCOUNT_INC(db);
	return 0;
}

int git_refdb_open(git_refdb **out, git_repository *repo)
{
	git_refdb *db;
	git_refdb_backend *dir;

	GIT_ASSERT_ARG(out);
	GIT_ASSERT_ARG(repo);

	*out = NULL;

	if (git_refdb_new(&db, repo) < 0)
		return -1;

	/* Add the default (filesystem) backend */
	if (git_refdb_backend_fs(&dir, repo) < 0) {
		git_refdb_free(db);
		return -1;
	}

	db->repo = repo;
	db->backend = dir;

	*out = db;
	return 0;
}

static void refdb_free_backend(git_refdb *db)
{
	if (db->backend)
		db->backend->free(db->backend);
}

int git_refdb_set_backend(git_refdb *db, git_refdb_backend *backend)
{
	GIT_ERROR_CHECK_VERSION(backend, GIT_REFDB_BACKEND_VERSION, "git_refdb_backend");

	if (!backend->exists || !backend->lookup || !backend->iterator ||
	    !backend->write || !backend->rename || !backend->del ||
	    !backend->has_log || !backend->ensure_log || !backend->free ||
	    !backend->reflog_read || !backend->reflog_write ||
	    !backend->reflog_rename || !backend->reflog_delete ||
	    (backend->lock && !backend->unlock)) {
		git_error_set(GIT_ERROR_REFERENCE, "incomplete refdb backend implementation");
		return GIT_EINVALID;
	}

	refdb_free_backend(db);
	db->backend = backend;

	return 0;
}

int git_refdb_compress(git_refdb *db)
{
	GIT_ASSERT_ARG(db);

	if (db->backend->compress)
		return db->backend->compress(db->backend);

	return 0;
}

void git_refdb__free(git_refdb *db)
{
	refdb_free_backend(db);
	git__memzero(db, sizeof(*db));
	git__free(db);
}

void git_refdb_free(git_refdb *db)
{
	if (db == NULL)
		return;

	GIT_REFCOUNT_DEC(db, git_refdb__free);
}

int git_refdb_exists(int *exists, git_refdb *refdb, const char *ref_name)
{
	GIT_ASSERT_ARG(exists);
	GIT_ASSERT_ARG(refdb);
	GIT_ASSERT_ARG(refdb->backend);

	return refdb->backend->exists(exists, refdb->backend, ref_name);
}

int git_refdb_lookup(git_reference **out, git_refdb *db, const char *ref_name)
{
	git_reference *ref;
	int error;

	GIT_ASSERT_ARG(db);
	GIT_ASSERT_ARG(db->backend);
	GIT_ASSERT_ARG(out);
	GIT_ASSERT_ARG(ref_name);

	error = db->backend->lookup(&ref, db->backend, ref_name);
	if (error < 0)
		return error;

	GIT_REFCOUNT_INC(db);
	ref->db = db;

	*out = ref;
	return 0;
}

int git_refdb_resolve(
	git_reference **out,
	git_refdb *db,
	const char *ref_name,
	int max_nesting)
{
	git_reference *ref = NULL;
	int error = 0, nesting;

	*out = NULL;

	if (max_nesting > MAX_NESTING_LEVEL)
		max_nesting = MAX_NESTING_LEVEL;
	else if (max_nesting < 0)
		max_nesting = DEFAULT_NESTING_LEVEL;

	if ((error = git_refdb_lookup(&ref, db, ref_name)) < 0)
		goto out;

	for (nesting = 0; nesting < max_nesting; nesting++) {
		git_reference *resolved;

		if (ref->type == GIT_REFERENCE_DIRECT)
			break;

		if ((error = git_refdb_lookup(&resolved, db, git_reference_symbolic_target(ref))) < 0) {
			/* If we found a symbolic reference with a nonexistent target, return it. */
			if (error == GIT_ENOTFOUND) {
				error = 0;
				*out = ref;
				ref = NULL;
			}
			goto out;
		}

		git_reference_free(ref);
		ref = resolved;
	}

	if (ref->type != GIT_REFERENCE_DIRECT && max_nesting != 0) {
		git_error_set(GIT_ERROR_REFERENCE,
			"cannot resolve reference (>%u levels deep)", max_nesting);
		error = -1;
		goto out;
	}

	*out = ref;
	ref = NULL;
out:
	git_reference_free(ref);
	return error;
}

int git_refdb_iterator(git_reference_iterator **out, git_refdb *db, const char *glob)
{
	int error;

	if (!db->backend || !db->backend->iterator) {
		git_error_set(GIT_ERROR_REFERENCE, "this backend doesn't support iterators");
		return -1;
	}

	if ((error = db->backend->iterator(out, db->backend, glob)) < 0)
		return error;

	GIT_REFCOUNT_INC(db);
	(*out)->db = db;

	return 0;
}

int git_refdb_iterator_next(git_reference **out, git_reference_iterator *iter)
{
	int error;

	if ((error = iter->next(out, iter)) < 0)
		return error;

	GIT_REFCOUNT_INC(iter->db);
	(*out)->db = iter->db;

	return 0;
}

int git_refdb_iterator_next_name(const char **out, git_reference_iterator *iter)
{
	return iter->next_name(out, iter);
}

void git_refdb_iterator_free(git_reference_iterator *iter)
{
	GIT_REFCOUNT_DEC(iter->db, git_refdb__free);
	iter->free(iter);
}

int git_refdb_write(git_refdb *db, git_reference *ref, int force, const git_signature *who, const char *message, const git_oid *old_id, const char *old_target)
{
	GIT_ASSERT_ARG(db);
	GIT_ASSERT_ARG(db->backend);

	GIT_REFCOUNT_INC(db);
	ref->db = db;

	return db->backend->write(db->backend, ref, force, who, message, old_id, old_target);
}

int git_refdb_rename(
	git_reference **out,
	git_refdb *db,
	const char *old_name,
	const char *new_name,
	int force,
	const git_signature *who,
	const char *message)
{
	int error;

	GIT_ASSERT_ARG(db);
	GIT_ASSERT_ARG(db->backend);

	error = db->backend->rename(out, db->backend, old_name, new_name, force, who, message);
	if (error < 0)
		return error;

	if (out) {
		GIT_REFCOUNT_INC(db);
		(*out)->db = db;
	}

	return 0;
}

int git_refdb_delete(struct git_refdb *db, const char *ref_name, const git_oid *old_id, const char *old_target)
{
	GIT_ASSERT_ARG(db);
	GIT_ASSERT_ARG(db->backend);

	return db->backend->del(db->backend, ref_name, old_id, old_target);
}

int git_refdb_reflog_read(git_reflog **out, git_refdb *db,  const char *name)
{
	int error;

	GIT_ASSERT_ARG(db);
	GIT_ASSERT_ARG(db->backend);

	if ((error = db->backend->reflog_read(out, db->backend, name)) < 0)
		return error;

	GIT_REFCOUNT_INC(db);
	(*out)->db = db;

	return 0;
}

int git_refdb_should_write_reflog(int *out, git_refdb *db, const git_reference *ref)
{
	int error, logall;

	error = git_repository__configmap_lookup(&logall, db->repo, GIT_CONFIGMAP_LOGALLREFUPDATES);
	if (error < 0)
		return error;

	/* Defaults to the opposite of the repo being bare */
	if (logall == GIT_LOGALLREFUPDATES_UNSET)
		logall = !git_repository_is_bare(db->repo);

	*out = 0;
	switch (logall) {
	case GIT_LOGALLREFUPDATES_FALSE:
		*out = 0;
		break;

	case GIT_LOGALLREFUPDATES_TRUE:
		/* Only write if it already has a log,
		 * or if it's under heads/, remotes/ or notes/
		 */
		*out = git_refdb_has_log(db, ref->name) ||
			!git__prefixcmp(ref->name, GIT_REFS_HEADS_DIR) ||
			!git__strcmp(ref->name, GIT_HEAD_FILE) ||
			!git__prefixcmp(ref->name, GIT_REFS_REMOTES_DIR) ||
			!git__prefixcmp(ref->name, GIT_REFS_NOTES_DIR);
		break;

	case GIT_LOGALLREFUPDATES_ALWAYS:
		*out = 1;
		break;
	}

	return 0;
}

int git_refdb_should_write_head_reflog(int *out, git_refdb *db, const git_reference *ref)
{
	git_reference *head = NULL, *resolved = NULL;
	const char *name;
	int error;

	*out = 0;

	if (ref->type == GIT_REFERENCE_SYMBOLIC) {
		error = 0;
		goto out;
	}

	if ((error = git_refdb_lookup(&head, db, GIT_HEAD_FILE)) < 0)
		goto out;

	if (git_reference_type(head) == GIT_REFERENCE_DIRECT)
		goto out;

	/* Go down the symref chain until we find the branch */
	if ((error = git_refdb_resolve(&resolved, db, git_reference_symbolic_target(head), -1)) < 0) {
		if (error != GIT_ENOTFOUND)
			goto out;
		error = 0;
		name = git_reference_symbolic_target(head);
	} else if (git_reference_type(resolved) == GIT_REFERENCE_SYMBOLIC) {
		name = git_reference_symbolic_target(resolved);
	} else {
		name = git_reference_name(resolved);
	}

	if (strcmp(name, ref->name))
		goto out;

	*out = 1;

out:
	git_reference_free(resolved);
	git_reference_free(head);
	return error;
}

int git_refdb_has_log(git_refdb *db, const char *refname)
{
	GIT_ASSERT_ARG(db);
	GIT_ASSERT_ARG(refname);

	return db->backend->has_log(db->backend, refname);
}

int git_refdb_ensure_log(git_refdb *db, const char *refname)
{
	GIT_ASSERT_ARG(db);
	GIT_ASSERT_ARG(refname);

	return db->backend->ensure_log(db->backend, refname);
}

int git_refdb_init_backend(git_refdb_backend *backend, unsigned int version)
{
	GIT_INIT_STRUCTURE_FROM_TEMPLATE(
		backend, version, git_refdb_backend, GIT_REFDB_BACKEND_INIT);
	return 0;
}

int git_refdb_lock(void **payload, git_refdb *db, const char *refname)
{
	GIT_ASSERT_ARG(payload);
	GIT_ASSERT_ARG(db);
	GIT_ASSERT_ARG(refname);

	if (!db->backend->lock) {
		git_error_set(GIT_ERROR_REFERENCE, "backend does not support locking");
		return -1;
	}

	return db->backend->lock(payload, db->backend, refname);
}

int git_refdb_unlock(git_refdb *db, void *payload, int success, int update_reflog, const git_reference *ref, const git_signature *sig, const char *message)
{
	GIT_ASSERT_ARG(db);

	return db->backend->unlock(db->backend, payload, success, update_reflog, ref, sig, message);
}
Commit	Line	Data
d00d5464 ET	1	/*
	2	* Copyright (C) the libgit2 contributors. All rights reserved.
	3	*
	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.
	6	*/
	7
eae0bfdc	8	#include "refdb.h"
4dcd8780	9
d00d5464 ET	10	#include "git2/object.h"
	11	#include "git2/refs.h"
	12	#include "git2/refdb.h"
4dcd8780 RB	13	#include "git2/sys/refdb_backend.h"
4dcd8780 RB	14
d00d5464	15	#include "hash.h"
d00d5464	16	#include "refs.h"
b976f3c2	17	#include "reflog.h"
eae0bfdc	18	#include "posix.h"
d00d5464	19
22a2d3d5 UG	20	#define DEFAULT_NESTING_LEVEL 5
	21	#define MAX_NESTING_LEVEL 10
	22
d00d5464 ET	23	int git_refdb_new(git_refdb *out, git_repository repo)
	24	{
	25	git_refdb *db;
	26
c25aa7cd PP	27	GIT_ASSERT_ARG(out);
c25aa7cd PP	28	GIT_ASSERT_ARG(repo);
d00d5464 ET	29
d00d5464 ET	30	db = git__calloc(1, sizeof(*db));
ac3d33df	31	GIT_ERROR_CHECK_ALLOC(db);
d00d5464 ET	32
	33	db->repo = repo;
	34
	35	*out = db;
	36	GIT_REFCOUNT_INC(db);
	37	return 0;
	38	}
	39
	40	int git_refdb_open(git_refdb *out, git_repository repo)
	41	{
	42	git_refdb *db;
	43	git_refdb_backend *dir;
	44
c25aa7cd PP	45	GIT_ASSERT_ARG(out);
c25aa7cd PP	46	GIT_ASSERT_ARG(repo);
d00d5464 ET	47
	48	*out = NULL;
	49
	50	if (git_refdb_new(&db, repo) < 0)
	51	return -1;
	52
	53	/* Add the default (filesystem) backend */
4e4eab52	54	if (git_refdb_backend_fs(&dir, repo) < 0) {
d00d5464 ET	55	git_refdb_free(db);
	56	return -1;
	57	}
	58
	59	db->repo = repo;
	60	db->backend = dir;
	61
	62	*out = db;
	63	return 0;
	64	}
	65
21ca0451	66	static void refdb_free_backend(git_refdb *db)
d00d5464	67	{
d3b29fb9 AS	68	if (db->backend)
d3b29fb9 AS	69	db->backend->free(db->backend);
21ca0451	70	}
d00d5464	71
21ca0451 RB	72	int git_refdb_set_backend(git_refdb db, git_refdb_backend backend)
21ca0451 RB	73	{
22a2d3d5 UG	74	GIT_ERROR_CHECK_VERSION(backend, GIT_REFDB_BACKEND_VERSION, "git_refdb_backend");
	75
	76	if (!backend->exists \|\| !backend->lookup \|\| !backend->iterator \|\|
	77	!backend->write \|\| !backend->rename \|\| !backend->del \|\|
	78	!backend->has_log \|\| !backend->ensure_log \|\| !backend->free \|\|
	79	!backend->reflog_read \|\| !backend->reflog_write \|\|
	80	!backend->reflog_rename \|\| !backend->reflog_delete \|\|
	81	(backend->lock && !backend->unlock)) {
	82	git_error_set(GIT_ERROR_REFERENCE, "incomplete refdb backend implementation");
	83	return GIT_EINVALID;
	84	}
	85
21ca0451	86	refdb_free_backend(db);
d00d5464 ET	87	db->backend = backend;
	88
	89	return 0;
	90	}
	91
	92	int git_refdb_compress(git_refdb *db)
	93	{
c25aa7cd	94	GIT_ASSERT_ARG(db);
4dcd8780	95
21ca0451	96	if (db->backend->compress)
d00d5464	97	return db->backend->compress(db->backend);
4dcd8780	98
d00d5464 ET	99	return 0;
	100	}
	101
979f75d8	102	void git_refdb__free(git_refdb *db)
d00d5464	103	{
21ca0451	104	refdb_free_backend(db);
6de9b2ee	105	git__memzero(db, sizeof(*db));
d00d5464 ET	106	git__free(db);
	107	}
	108
7ebc249c ET	109	void git_refdb_free(git_refdb *db)
	110	{
	111	if (db == NULL)
	112	return;
	113
979f75d8	114	GIT_REFCOUNT_DEC(db, git_refdb__free);
7ebc249c ET	115	}
7ebc249c ET	116
d00d5464 ET	117	int git_refdb_exists(int exists, git_refdb refdb, const char *ref_name)
d00d5464 ET	118	{
c25aa7cd PP	119	GIT_ASSERT_ARG(exists);
	120	GIT_ASSERT_ARG(refdb);
	121	GIT_ASSERT_ARG(refdb->backend);
d00d5464 ET	122
	123	return refdb->backend->exists(exists, refdb->backend, ref_name);
	124	}
	125
	126	int git_refdb_lookup(git_reference *out, git_refdb db, const char *ref_name)
	127	{
4e4eab52 ET	128	git_reference *ref;
	129	int error;
	130
c25aa7cd PP	131	GIT_ASSERT_ARG(db);
	132	GIT_ASSERT_ARG(db->backend);
	133	GIT_ASSERT_ARG(out);
	134	GIT_ASSERT_ARG(ref_name);
4e4eab52	135
ec24e542 VM	136	error = db->backend->lookup(&ref, db->backend, ref_name);
	137	if (error < 0)
	138	return error;
	139
	140	GIT_REFCOUNT_INC(db);
	141	ref->db = db;
4e4eab52	142
ec24e542 VM	143	*out = ref;
ec24e542 VM	144	return 0;
d00d5464 ET	145	}
d00d5464 ET	146
22a2d3d5 UG	147	int git_refdb_resolve(
	148	git_reference **out,
	149	git_refdb *db,
	150	const char *ref_name,
	151	int max_nesting)
	152	{
	153	git_reference *ref = NULL;
	154	int error = 0, nesting;
	155
	156	*out = NULL;
	157
	158	if (max_nesting > MAX_NESTING_LEVEL)
	159	max_nesting = MAX_NESTING_LEVEL;
	160	else if (max_nesting < 0)
	161	max_nesting = DEFAULT_NESTING_LEVEL;
	162
	163	if ((error = git_refdb_lookup(&ref, db, ref_name)) < 0)
	164	goto out;
	165
	166	for (nesting = 0; nesting < max_nesting; nesting++) {
	167	git_reference *resolved;
	168
	169	if (ref->type == GIT_REFERENCE_DIRECT)
	170	break;
	171
	172	if ((error = git_refdb_lookup(&resolved, db, git_reference_symbolic_target(ref))) < 0) {
	173	/* If we found a symbolic reference with a nonexistent target, return it. */
	174	if (error == GIT_ENOTFOUND) {
	175	error = 0;
	176	*out = ref;
	177	ref = NULL;
	178	}
	179	goto out;
	180	}
	181
	182	git_reference_free(ref);
	183	ref = resolved;
	184	}
	185
	186	if (ref->type != GIT_REFERENCE_DIRECT && max_nesting != 0) {
	187	git_error_set(GIT_ERROR_REFERENCE,
	188	"cannot resolve reference (>%u levels deep)", max_nesting);
	189	error = -1;
	190	goto out;
	191	}
	192
	193	*out = ref;
	194	ref = NULL;
	195	out:
	196	git_reference_free(ref);
	197	return error;
	198	}
	199
ec24e542	200	int git_refdb_iterator(git_reference_iterator *out, git_refdb db, const char *glob)
4def7035	201	{
ce5553d4 CMN	202	int error;
ce5553d4 CMN	203
51fc5e89	204	if (!db->backend \|\| !db->backend->iterator) {
ac3d33df	205	git_error_set(GIT_ERROR_REFERENCE, "this backend doesn't support iterators");
51fc5e89 CMN	206	return -1;
	207	}
	208
ce5553d4 CMN	209	if ((error = db->backend->iterator(out, db->backend, glob)) < 0)
ce5553d4 CMN	210	return error;
c58cac12	211
ec24e542 VM	212	GIT_REFCOUNT_INC(db);
	213	(*out)->db = db;
	214
c58cac12 CMN	215	return 0;
	216	}
	217
ec24e542	218	int git_refdb_iterator_next(git_reference *out, git_reference_iterator iter)
c58cac12	219	{
ec24e542	220	int error;
c58cac12	221
ec24e542 VM	222	if ((error = iter->next(out, iter)) < 0)
ec24e542 VM	223	return error;
c58cac12	224
ec24e542 VM	225	GIT_REFCOUNT_INC(iter->db);
ec24e542 VM	226	(*out)->db = iter->db;
4def7035	227
4def7035 CMN	228	return 0;
	229	}
	230
ec24e542	231	int git_refdb_iterator_next_name(const char *out, git_reference_iterator iter)
4def7035	232	{
ec24e542	233	return iter->next_name(out, iter);
4def7035 CMN	234	}
	235
	236	void git_refdb_iterator_free(git_reference_iterator *iter)
	237	{
979f75d8	238	GIT_REFCOUNT_DEC(iter->db, git_refdb__free);
ec24e542	239	iter->free(iter);
4def7035 CMN	240	}
4def7035 CMN	241
91123661	242	int git_refdb_write(git_refdb db, git_reference ref, int force, const git_signature who, const char message, const git_oid old_id, const char old_target)
d00d5464	243	{
c25aa7cd PP	244	GIT_ASSERT_ARG(db);
c25aa7cd PP	245	GIT_ASSERT_ARG(db->backend);
4e6e2ff2 VM	246
	247	GIT_REFCOUNT_INC(db);
	248	ref->db = db;
	249
91123661	250	return db->backend->write(db->backend, ref, force, who, message, old_id, old_target);
4e6e2ff2 VM	251	}
	252
	253	int git_refdb_rename(
	254	git_reference **out,
	255	git_refdb *db,
	256	const char *old_name,
	257	const char *new_name,
110df893	258	int force,
a57dd3b7	259	const git_signature *who,
110df893	260	const char *message)
4e6e2ff2 VM	261	{
	262	int error;
	263
c25aa7cd PP	264	GIT_ASSERT_ARG(db);
	265	GIT_ASSERT_ARG(db->backend);
	266
a57dd3b7	267	error = db->backend->rename(out, db->backend, old_name, new_name, force, who, message);
4e6e2ff2 VM	268	if (error < 0)
	269	return error;
	270
	271	if (out) {
	272	GIT_REFCOUNT_INC(db);
	273	(*out)->db = db;
	274	}
	275
	276	return 0;
d00d5464 ET	277	}
d00d5464 ET	278
7ee8c7e6	279	int git_refdb_delete(struct git_refdb db, const char ref_name, const git_oid old_id, const char old_target)
d00d5464	280	{
c25aa7cd PP	281	GIT_ASSERT_ARG(db);
	282	GIT_ASSERT_ARG(db->backend);
	283
7ee8c7e6	284	return db->backend->del(db->backend, ref_name, old_id, old_target);
d00d5464	285	}
b976f3c2 CMN	286
	287	int git_refdb_reflog_read(git_reflog *out, git_refdb db, const char *name)
	288	{
	289	int error;
	290
c25aa7cd PP	291	GIT_ASSERT_ARG(db);
c25aa7cd PP	292	GIT_ASSERT_ARG(db->backend);
b976f3c2 CMN	293
	294	if ((error = db->backend->reflog_read(out, db->backend, name)) < 0)
	295	return error;
	296
	297	GIT_REFCOUNT_INC(db);
	298	(*out)->db = db;
	299
	300	return 0;
	301	}
8d5ec910	302
22a2d3d5 UG	303	int git_refdb_should_write_reflog(int out, git_refdb db, const git_reference *ref)
	304	{
	305	int error, logall;
	306
	307	error = git_repository__configmap_lookup(&logall, db->repo, GIT_CONFIGMAP_LOGALLREFUPDATES);
	308	if (error < 0)
	309	return error;
	310
	311	/* Defaults to the opposite of the repo being bare */
	312	if (logall == GIT_LOGALLREFUPDATES_UNSET)
	313	logall = !git_repository_is_bare(db->repo);
	314
	315	*out = 0;
	316	switch (logall) {
	317	case GIT_LOGALLREFUPDATES_FALSE:
	318	*out = 0;
	319	break;
	320
	321	case GIT_LOGALLREFUPDATES_TRUE:
	322	/* Only write if it already has a log,
	323	* or if it's under heads/, remotes/ or notes/
	324	*/
	325	*out = git_refdb_has_log(db, ref->name) \|\|
	326	!git__prefixcmp(ref->name, GIT_REFS_HEADS_DIR) \|\|
	327	!git__strcmp(ref->name, GIT_HEAD_FILE) \|\|
	328	!git__prefixcmp(ref->name, GIT_REFS_REMOTES_DIR) \|\|
	329	!git__prefixcmp(ref->name, GIT_REFS_NOTES_DIR);
	330	break;
	331
	332	case GIT_LOGALLREFUPDATES_ALWAYS:
	333	*out = 1;
	334	break;
	335	}
	336
	337	return 0;
	338	}
	339
	340	int git_refdb_should_write_head_reflog(int out, git_refdb db, const git_reference *ref)
	341	{
	342	git_reference head = NULL, resolved = NULL;
	343	const char *name;
	344	int error;
	345
	346	*out = 0;
	347
	348	if (ref->type == GIT_REFERENCE_SYMBOLIC) {
	349	error = 0;
	350	goto out;
	351	}
	352
	353	if ((error = git_refdb_lookup(&head, db, GIT_HEAD_FILE)) < 0)
	354	goto out;
	355
	356	if (git_reference_type(head) == GIT_REFERENCE_DIRECT)
	357	goto out;
	358
	359	/* Go down the symref chain until we find the branch */
	360	if ((error = git_refdb_resolve(&resolved, db, git_reference_symbolic_target(head), -1)) < 0) {
	361	if (error != GIT_ENOTFOUND)
	362	goto out;
	363	error = 0;
	364	name = git_reference_symbolic_target(head);
	365	} else if (git_reference_type(resolved) == GIT_REFERENCE_SYMBOLIC) {
	366	name = git_reference_symbolic_target(resolved);
367	} else {
368	name = git_reference_name(resolved);
369	}
370
371	if (strcmp(name, ref->name))
372	goto out;
373
374	*out = 1;
375
376	out:
377	git_reference_free(resolved);
378	git_reference_free(head);
379	return error;
380	}
381
f2105129 CMN	382	int git_refdb_has_log(git_refdb db, const char refname)
f2105129 CMN	383	{
c25aa7cd PP	384	GIT_ASSERT_ARG(db);
c25aa7cd PP	385	GIT_ASSERT_ARG(refname);
f2105129 CMN	386
	387	return db->backend->has_log(db->backend, refname);
	388	}
	389
8d5ec910 CMN	390	int git_refdb_ensure_log(git_refdb db, const char refname)
8d5ec910 CMN	391	{
c25aa7cd PP	392	GIT_ASSERT_ARG(db);
c25aa7cd PP	393	GIT_ASSERT_ARG(refname);
8d5ec910 CMN	394
	395	return db->backend->ensure_log(db->backend, refname);
	396	}
b9f81997	397
bc91347b	398	int git_refdb_init_backend(git_refdb_backend *backend, unsigned int version)
b9f81997	399	{
bc91347b RB	400	GIT_INIT_STRUCTURE_FROM_TEMPLATE(
	401	backend, version, git_refdb_backend, GIT_REFDB_BACKEND_INIT);
	402	return 0;
b9f81997	403	}
ab8d9242 CMN	404
	405	int git_refdb_lock(void *payload, git_refdb db, const char *refname)
	406	{
c25aa7cd PP	407	GIT_ASSERT_ARG(payload);
	408	GIT_ASSERT_ARG(db);
	409	GIT_ASSERT_ARG(refname);
ab8d9242 CMN	410
ab8d9242 CMN	411	if (!db->backend->lock) {
ac3d33df	412	git_error_set(GIT_ERROR_REFERENCE, "backend does not support locking");
ab8d9242 CMN	413	return -1;
	414	}
	415
	416	return db->backend->lock(payload, db->backend, refname);
	417	}
	418
	419	int git_refdb_unlock(git_refdb db, void payload, int success, int update_reflog, const git_reference ref, const git_signature sig, const char *message)
	420	{
c25aa7cd	421	GIT_ASSERT_ARG(db);
ab8d9242 CMN	422
	423	return db->backend->unlock(db->backend, payload, success, update_reflog, ref, sig, message);
	424	}