/*
* 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);
}
