/*
* List of all available backends
*/
-static struct ref_storage_be *refs_backends = &refs_be_files;
+static const struct ref_storage_be *refs_backends[] = {
+ [REF_STORAGE_FORMAT_FILES] = &refs_be_files,
+};
-static struct ref_storage_be *find_ref_storage_backend(const char *name)
+static const struct ref_storage_be *find_ref_storage_backend(unsigned int ref_storage_format)
{
- struct ref_storage_be *be;
- for (be = refs_backends; be; be = be->next)
- if (!strcmp(be->name, name))
- return be;
+ if (ref_storage_format < ARRAY_SIZE(refs_backends))
+ return refs_backends[ref_storage_format];
return NULL;
}
+unsigned int ref_storage_format_by_name(const char *name)
+{
+ for (unsigned int i = 0; i < ARRAY_SIZE(refs_backends); i++)
+ if (refs_backends[i] && !strcmp(refs_backends[i]->name, name))
+ return i;
+ return REF_STORAGE_FORMAT_UNKNOWN;
+}
+
+const char *ref_storage_format_to_name(unsigned int ref_storage_format)
+{
+ const struct ref_storage_be *be = find_ref_storage_backend(ref_storage_format);
+ if (!be)
+ return "unknown";
+ return be->name;
+}
+
/*
* How to handle various characters in refnames:
* 0: An acceptable character for refs
int result = -1;
strbuf_addf(&full_path, "%s/%s", ref_store->gitdir, refname);
- if (strbuf_read_file(&content, full_path.buf, 0) < 0)
+ if (strbuf_read_file(&content, full_path.buf, 0) < 0) {
+ *failure_errno = errno;
goto done;
+ }
result = parse_loose_ref_contents(content.buf, oid, referent, type,
failure_errno);
return result;
}
+static int is_special_ref(const char *refname)
+{
+ /*
+ * Special references are refs that have different semantics compared
+ * to "normal" refs. These refs can thus not be stored in the ref
+ * backend, but must always be accessed via the filesystem. The
+ * following refs are special:
+ *
+ * - FETCH_HEAD may contain multiple object IDs, and each one of them
+ * carries additional metadata like where it came from.
+ *
+ * - MERGE_HEAD may contain multiple object IDs when merging multiple
+ * heads.
+ *
+ * Reading, writing or deleting references must consistently go either
+ * through the filesystem (special refs) or through the reference
+ * backend (normal ones).
+ */
+ static const char * const special_refs[] = {
+ "FETCH_HEAD",
+ "MERGE_HEAD",
+ };
+ size_t i;
+
+ for (i = 0; i < ARRAY_SIZE(special_refs); i++)
+ if (!strcmp(refname, special_refs[i]))
+ return 1;
+
+ return 0;
+}
+
int refs_read_raw_ref(struct ref_store *ref_store, const char *refname,
struct object_id *oid, struct strbuf *referent,
unsigned int *type, int *failure_errno)
{
assert(failure_errno);
- if (!strcmp(refname, "FETCH_HEAD") || !strcmp(refname, "MERGE_HEAD")) {
+ if (is_special_ref(refname))
return refs_read_special_head(ref_store, refname, oid, referent,
type, failure_errno);
- }
return ref_store->be->read_raw_ref(ref_store, refname, oid, referent,
type, failure_errno);
}
/* backend functions */
-int refs_init_db(struct strbuf *err)
+int refs_init_db(struct ref_store *refs, int flags, struct strbuf *err)
{
- struct ref_store *refs = get_main_ref_store(the_repository);
-
- return refs->be->init_db(refs, err);
+ return refs->be->init_db(refs, flags, err);
}
const char *resolve_ref_unsafe(const char *refname, int resolve_flags,
const char *gitdir,
unsigned int flags)
{
- const char *be_name = "files";
- struct ref_storage_be *be = find_ref_storage_backend(be_name);
+ const struct ref_storage_be *be;
struct ref_store *refs;
+ be = find_ref_storage_backend(repo->ref_storage_format);
if (!be)
- BUG("reference backend %s is unknown", be_name);
+ BUG("reference backend is unknown");
refs = be->init(repo, gitdir, flags);
return refs;
int refs_delete_refs(struct ref_store *refs, const char *logmsg,
struct string_list *refnames, unsigned int flags)
{
+ struct ref_transaction *transaction;
+ struct strbuf err = STRBUF_INIT;
+ struct string_list_item *item;
+ int ret = 0, failures = 0;
char *msg;
- int retval;
+
+ if (!refnames->nr)
+ return 0;
msg = normalize_reflog_message(logmsg);
- retval = refs->be->delete_refs(refs, msg, refnames, flags);
+
+ /*
+ * Since we don't check the references' old_oids, the
+ * individual updates can't fail, so we can pack all of the
+ * updates into a single transaction.
+ */
+ transaction = ref_store_transaction_begin(refs, &err);
+ if (!transaction) {
+ ret = error("%s", err.buf);
+ goto out;
+ }
+
+ for_each_string_list_item(item, refnames) {
+ ret = ref_transaction_delete(transaction, item->string,
+ NULL, flags, msg, &err);
+ if (ret) {
+ warning(_("could not delete reference %s: %s"),
+ item->string, err.buf);
+ strbuf_reset(&err);
+ failures = 1;
+ }
+ }
+
+ ret = ref_transaction_commit(transaction, &err);
+ if (ret) {
+ if (refnames->nr == 1)
+ error(_("could not delete reference %s: %s"),
+ refnames->items[0].string, err.buf);
+ else
+ error(_("could not delete references: %s"), err.buf);
+ }
+
+out:
+ if (!ret && failures)
+ ret = -1;
+ ref_transaction_free(transaction);
+ strbuf_release(&err);
free(msg);
- return retval;
+ return ret;
}
int delete_refs(const char *msg, struct string_list *refnames,
projects / thirdparty / git.git / blobdiff