Merge branch 'dt/pre-refs-backend'

Code restructuring around the "refs" area to prepare for pluggable
refs backends.

* dt/pre-refs-backend: (24 commits)
  refs: on symref reflog expire, lock symref not referrent
  refs: move resolve_ref_unsafe into common code
  show_head_ref(): check the result of resolve_ref_namespace()
  check_aliased_update(): check that dst_name is non-NULL
  checkout_paths(): remove unneeded flag variable
  cmd_merge(): remove unneeded flag variable
  fsck_head_link(): remove unneeded flag variable
  read_raw_ref(): change flags parameter to unsigned int
  files-backend: inline resolve_ref_1() into resolve_ref_unsafe()
  read_raw_ref(): manage own scratch space
  files-backend: break out ref reading
  resolve_ref_1(): eliminate local variable "bad_name"
  resolve_ref_1(): reorder code
  resolve_ref_1(): eliminate local variable
  resolve_ref_unsafe(): ensure flags is always set
  resolve_ref_unsafe(): use for loop to count up to MAXDEPTH
  resolve_missing_loose_ref(): simplify semantics
  t1430: improve test coverage of deletion of badly-named refs
  t1430: test for-each-ref in the presence of badly-named refs
  t1430: don't rely on symbolic-ref for creating broken symrefs
  ...

4 files changed, 5 insertions, 7 deletions

diff --git a/builtin/checkout.c b/builtin/checkout.c
index efcbd8f6b..ea2fe1cf3 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -242,7 +242,6 @@ static int checkout_paths(const struct checkout_opts *opts,
 	struct checkout state;
 	static char *ps_matched;
 	unsigned char rev[20];
-	int flag;
 	struct commit *head;
 	int errs = 0;
 	struct lock_file *lock_file;
@@ -375,7 +374,7 @@ static int checkout_paths(const struct checkout_opts *opts,
 	if (write_locked_index(&the_index, lock_file, COMMIT_LOCK))
 		die(_("unable to write new index file"));
 
-	read_ref_full("HEAD", 0, rev, &flag);
+	read_ref_full("HEAD", 0, rev, NULL);
 	head = lookup_commit_reference_gently(rev, 1);
 
 	errs |= post_checkout_hook(head, head, 0);
diff --git a/builtin/fsck.c b/builtin/fsck.c
index 55eac756f..3f2745688 100644
--- a/builtin/fsck.c
+++ b/builtin/fsck.c
@@ -493,13 +493,12 @@ static void fsck_object_dir(const char *path)
 
 static int fsck_head_link(void)
 {
-	int flag;
 	int null_is_error = 0;
 
 	if (verbose)
 		fprintf(stderr, "Checking HEAD link\n");
 
-	head_points_at = resolve_ref_unsafe("HEAD", 0, head_oid.hash, &flag);
+	head_points_at = resolve_ref_unsafe("HEAD", 0, head_oid.hash, NULL);
 	if (!head_points_at) {
 		errors_found |= ERROR_REFS;
 		return error("Invalid HEAD");
diff --git a/builtin/merge.c b/builtin/merge.c
index 41467e427..1ec44f0c1 100644
--- a/builtin/merge.c
+++ b/builtin/merge.c
@@ -1168,7 +1168,7 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
 	struct commit *head_commit;
 	struct strbuf buf = STRBUF_INIT;
 	const char *head_arg;
-	int flag, i, ret = 0, head_subsumed;
+	int i, ret = 0, head_subsumed;
 	int best_cnt = -1, merge_was_ok = 0, automerge_was_ok = 0;
 	struct commit_list *common = NULL;
 	const char *best_strategy = NULL, *wt_strategy = NULL;
@@ -1182,7 +1182,7 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
 	 * Check if we are _not_ on a detached HEAD, i.e. if there is a
 	 * current branch.
 	 */
-	branch = branch_to_free = resolve_refdup("HEAD", 0, head_sha1, &flag);
+	branch = branch_to_free = resolve_refdup("HEAD", 0, head_sha1, NULL);
 	if (branch && starts_with(branch, "refs/heads/"))
 		branch += 11;
 	if (!branch || is_null_sha1(head_sha1))
diff --git a/builtin/receive-pack.c b/builtin/receive-pack.c
index 220a899b9..a744437b5 100644
--- a/builtin/receive-pack.c
+++ b/builtin/receive-pack.c
@@ -1084,13 +1084,13 @@ static void check_aliased_update(struct command *cmd, struct string_list *list)
 	if (!(flag & REF_ISSYMREF))
 		return;
 
-	dst_name = strip_namespace(dst_name);
 	if (!dst_name) {
 		rp_error("refusing update to broken symref '%s'", cmd->ref_name);
 		cmd->skip_update = 1;
 		cmd->error_string = "broken symref";
 		return;
 	}
+	dst_name = strip_namespace(dst_name);
 
 	if ((item = string_list_lookup(list, dst_name)) == NULL)
 		return;