Merge branch 'ab/no-errno-from-resolve-ref-unsafe'

Remaining code-clean-up.

* ab/no-errno-from-resolve-ref-unsafe:
  refs API: remove "failure_errno" from refs_resolve_ref_unsafe()
  sequencer: don't use die_errno() on refs_resolve_ref_unsafe() failure

7 files changed, 35 insertions, 81 deletions

diff --git a/refs.c b/refs.c
index addb26293b..7017ae5980 100644
--- a/refs.c
+++ b/refs.c
@@ -269,10 +269,9 @@ char *refs_resolve_refdup(struct ref_store *refs,
 			  struct object_id *oid, int *flags)
 {
 	const char *result;
-	int ignore_errno;
 
 	result = refs_resolve_ref_unsafe(refs, refname, resolve_flags,
-					 oid, flags, &ignore_errno);
+					 oid, flags);
 	return xstrdup_or_null(result);
 }
 
@@ -294,11 +293,10 @@ struct ref_filter {
 
 int read_ref_full(const char *refname, int resolve_flags, struct object_id *oid, int *flags)
 {
-	int ignore_errno;
 	struct ref_store *refs = get_main_ref_store(the_repository);
 
 	if (refs_resolve_ref_unsafe(refs, refname, resolve_flags,
-				    oid, flags, &ignore_errno))
+				    oid, flags))
 		return 0;
 	return -1;
 }
@@ -310,9 +308,8 @@ int read_ref(const char *refname, struct object_id *oid)
 
 int refs_ref_exists(struct ref_store *refs, const char *refname)
 {
-	int ignore_errno;
 	return !!refs_resolve_ref_unsafe(refs, refname, RESOLVE_REF_READING,
-					 NULL, NULL, &ignore_errno);
+					 NULL, NULL);
 }
 
 int ref_exists(const char *refname)
@@ -656,15 +653,13 @@ int expand_ref(struct repository *repo, const char *str, int len,
 		struct object_id *this_result;
 		int flag;
 		struct ref_store *refs = get_main_ref_store(repo);
-		int ignore_errno;
 
 		this_result = refs_found ? &oid_from_ref : oid;
 		strbuf_reset(&fullref);
 		strbuf_addf(&fullref, *p, len, str);
 		r = refs_resolve_ref_unsafe(refs, fullref.buf,
 					    RESOLVE_REF_READING,
-					    this_result, &flag,
-					    &ignore_errno);
+					    this_result, &flag);
 		if (r) {
 			if (!refs_found++)
 				*ref = xstrdup(r);
@@ -693,14 +688,12 @@ int repo_dwim_log(struct repository *r, const char *str, int len,
 	for (p = ref_rev_parse_rules; *p; p++) {
 		struct object_id hash;
 		const char *ref, *it;
-		int ignore_errno;
 
 		strbuf_reset(&path);
 		strbuf_addf(&path, *p, len, str);
 		ref = refs_resolve_ref_unsafe(refs, path.buf,
 					      RESOLVE_REF_READING,
-					      oid ? &hash : NULL, NULL,
-					      &ignore_errno);
+					      oid ? &hash : NULL, NULL);
 		if (!ref)
 			continue;
 		if (refs_reflog_exists(refs, path.buf))
@@ -1390,10 +1383,9 @@ int refs_head_ref(struct ref_store *refs, each_ref_fn fn, void *cb_data)
 {
 	struct object_id oid;
 	int flag;
-	int ignore_errno;
 
 	if (refs_resolve_ref_unsafe(refs, "HEAD", RESOLVE_REF_READING,
-				    &oid, &flag, &ignore_errno))
+				    &oid, &flag))
 		return fn("HEAD", &oid, flag, cb_data);
 
 	return 0;
@@ -1682,15 +1674,13 @@ const char *refs_resolve_ref_unsafe(struct ref_store *refs,
 				    const char *refname,
 				    int resolve_flags,
 				    struct object_id *oid,
-				    int *flags, int *failure_errno)
+				    int *flags)
 {
 	static struct strbuf sb_refname = STRBUF_INIT;
 	struct object_id unused_oid;
 	int unused_flags;
 	int symref_count;
 
-	assert(failure_errno);
-
 	if (!oid)
 		oid = &unused_oid;
 	if (!flags)
@@ -1700,10 +1690,8 @@ const char *refs_resolve_ref_unsafe(struct ref_store *refs,
 
 	if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) {
 		if (!(resolve_flags & RESOLVE_REF_ALLOW_BAD_NAME) ||
-		    !refname_is_safe(refname)) {
-			*failure_errno = EINVAL;
+		    !refname_is_safe(refname))
 			return NULL;
-		}
 
 		/*
 		 * dwim_ref() uses REF_ISBROKEN to distinguish between
@@ -1718,9 +1706,10 @@ const char *refs_resolve_ref_unsafe(struct ref_store *refs,
 
 	for (symref_count = 0; symref_count < SYMREF_MAXDEPTH; symref_count++) {
 		unsigned int read_flags = 0;
+		int failure_errno;
 
 		if (refs_read_raw_ref(refs, refname, oid, &sb_refname,
-				      &read_flags, failure_errno)) {
+				      &read_flags, &failure_errno)) {
 			*flags |= read_flags;
 
 			/* In reading mode, refs must eventually resolve */
@@ -1732,9 +1721,9 @@ const char *refs_resolve_ref_unsafe(struct ref_store *refs,
 			 * may show errors besides ENOENT if there are
 			 * similarly-named refs.
 			 */
-			if (*failure_errno != ENOENT &&
-			    *failure_errno != EISDIR &&
-			    *failure_errno != ENOTDIR)
+			if (failure_errno != ENOENT &&
+			    failure_errno != EISDIR &&
+			    failure_errno != ENOTDIR)
 				return NULL;
 
 			oidclr(oid);
@@ -1760,16 +1749,13 @@ const char *refs_resolve_ref_unsafe(struct ref_store *refs,
 		}
 		if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) {
 			if (!(resolve_flags & RESOLVE_REF_ALLOW_BAD_NAME) ||
-			    !refname_is_safe(refname)) {
-				*failure_errno = EINVAL;
+			    !refname_is_safe(refname))
 				return NULL;
-			}
 
 			*flags |= REF_ISBROKEN | REF_BAD_NAME;
 		}
 	}
 
-	*failure_errno = ELOOP;
 	return NULL;
 }
 
@@ -1784,10 +1770,8 @@ int refs_init_db(struct strbuf *err)
 const char *resolve_ref_unsafe(const char *refname, int resolve_flags,
 			       struct object_id *oid, int *flags)
 {
-	int ignore_errno;
-
 	return refs_resolve_ref_unsafe(get_main_ref_store(the_repository), refname,
-				       resolve_flags, oid, flags, &ignore_errno);
+				       resolve_flags, oid, flags);
 }
 
 int resolve_gitlink_ref(const char *submodule, const char *refname,
@@ -1795,15 +1779,14 @@ int resolve_gitlink_ref(const char *submodule, const char *refname,
 {
 	struct ref_store *refs;
 	int flags;
-	int ignore_errno;
 
 	refs = get_submodule_ref_store(submodule);
 
 	if (!refs)
 		return -1;
 
-	if (!refs_resolve_ref_unsafe(refs, refname, 0, oid, &flags,
-				     &ignore_errno) || is_null_oid(oid))
+	if (!refs_resolve_ref_unsafe(refs, refname, 0, oid, &flags) ||
+	    is_null_oid(oid))
 		return -1;
 	return 0;
 }
diff --git a/refs.h b/refs.h
index 8f91a7f9ff..cd2d0c1ac0 100644
--- a/refs.h
+++ b/refs.h
@@ -58,11 +58,6 @@ struct worktree;
  * resolved. The function returns NULL for such ref names.
  * Caps and underscores refers to the special refs, such as HEAD,
  * FETCH_HEAD and friends, that all live outside of the refs/ directory.
- *
- * Callers should not inspect "errno" on failure, but rather pass in a
- * "failure_errno" parameter, on failure the "errno" will indicate the
- * type of failure encountered, but not necessarily one that came from
- * a syscall. We might have faked it up.
  */
 #define RESOLVE_REF_READING 0x01
 #define RESOLVE_REF_NO_RECURSE 0x02
@@ -72,7 +67,7 @@ const char *refs_resolve_ref_unsafe(struct ref_store *refs,
 				    const char *refname,
 				    int resolve_flags,
 				    struct object_id *oid,
-				    int *flags, int *failure_errno);
+				    int *flags);
 
 const char *resolve_ref_unsafe(const char *refname, int resolve_flags,
 			       struct object_id *oid, int *flags);
diff --git a/refs/files-backend.c b/refs/files-backend.c
index 43a3b882d7..a40267b3ae 100644
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@ -277,11 +277,10 @@ static void loose_fill_ref_dir(struct ref_store *ref_store,
 					 create_dir_entry(dir->cache, refname.buf,
 							  refname.len));
 		} else {
-			int ignore_errno;
 			if (!refs_resolve_ref_unsafe(&refs->base,
 						     refname.buf,
 						     RESOLVE_REF_READING,
-						     &oid, &flag, &ignore_errno)) {
+						     &oid, &flag)) {
 				oidclr(&oid);
 				flag |= REF_ISBROKEN;
 			} else if (is_null_oid(&oid)) {
@@ -1006,7 +1005,6 @@ static struct ref_lock *lock_ref_oid_basic(struct files_ref_store *refs,
 {
 	struct strbuf ref_file = STRBUF_INIT;
 	struct ref_lock *lock;
-	int ignore_errno;
 
 	files_assert_main_repository(refs, "lock_ref_oid_basic");
 	assert(err);
@@ -1034,7 +1032,7 @@ static struct ref_lock *lock_ref_oid_basic(struct files_ref_store *refs,
 	}
 
 	if (!refs_resolve_ref_unsafe(&refs->base, lock->ref_name, 0,
-				     &lock->old_oid, NULL, &ignore_errno))
+				     &lock->old_oid, NULL))
 		oidclr(&lock->old_oid);
 	goto out;
 
@@ -1399,7 +1397,6 @@ static int files_copy_or_rename_ref(struct ref_store *ref_store,
 	struct strbuf tmp_renamed_log = STRBUF_INIT;
 	int log, ret;
 	struct strbuf err = STRBUF_INIT;
-	int ignore_errno;
 
 	files_reflog_path(refs, &sb_oldref, oldrefname);
 	files_reflog_path(refs, &sb_newref, newrefname);
@@ -1413,7 +1410,7 @@ static int files_copy_or_rename_ref(struct ref_store *ref_store,
 
 	if (!refs_resolve_ref_unsafe(&refs->base, oldrefname,
 				     RESOLVE_REF_READING | RESOLVE_REF_NO_RECURSE,
-				     &orig_oid, &flag, &ignore_errno)) {
+				     &orig_oid, &flag)) {
 		ret = error("refname %s not found", oldrefname);
 		goto out;
 	}
@@ -1459,7 +1456,7 @@ static int files_copy_or_rename_ref(struct ref_store *ref_store,
 	 */
 	if (!copy && refs_resolve_ref_unsafe(&refs->base, newrefname,
 					     RESOLVE_REF_READING | RESOLVE_REF_NO_RECURSE,
-					     NULL, NULL, &ignore_errno) &&
+					     NULL, NULL) &&
 	    refs_delete_ref(&refs->base, NULL, newrefname,
 			    NULL, REF_NO_DEREF)) {
 		if (errno == EISDIR) {
@@ -1828,12 +1825,10 @@ static int commit_ref_update(struct files_ref_store *refs,
 		 */
 		int head_flag;
 		const char *head_ref;
-		int ignore_errno;
 
 		head_ref = refs_resolve_ref_unsafe(&refs->base, "HEAD",
 						   RESOLVE_REF_READING,
-						   NULL, &head_flag,
-						   &ignore_errno);
+						   NULL, &head_flag);
 		if (head_ref && (head_flag & REF_ISSYMREF) &&
 		    !strcmp(head_ref, lock->ref_name)) {
 			struct strbuf log_err = STRBUF_INIT;
@@ -1877,12 +1872,10 @@ static void update_symref_reflog(struct files_ref_store *refs,
 {
 	struct strbuf err = STRBUF_INIT;
 	struct object_id new_oid;
-	int ignore_errno;
 
 	if (logmsg &&
 	    refs_resolve_ref_unsafe(&refs->base, target,
-				    RESOLVE_REF_READING, &new_oid, NULL,
-				    &ignore_errno) &&
+				    RESOLVE_REF_READING, &new_oid, NULL) &&
 	    files_log_ref_write(refs, refname, &lock->old_oid,
 				&new_oid, logmsg, 0, &err)) {
 		error("%s", err.buf);
@@ -2156,7 +2149,6 @@ static int files_reflog_iterator_advance(struct ref_iterator *ref_iterator)
 		(struct files_reflog_iterator *)ref_iterator;
 	struct dir_iterator *diter = iter->dir_iterator;
 	int ok;
-	int ignore_errno;
 
 	while ((ok = dir_iterator_advance(diter)) == ITER_OK) {
 		int flags;
@@ -2170,8 +2162,7 @@ static int files_reflog_iterator_advance(struct ref_iterator *ref_iterator)
 
 		if (!refs_resolve_ref_unsafe(iter->ref_store,
 					     diter->relative_path, 0,
-					     &iter->oid, &flags,
-					     &ignore_errno)) {
+					     &iter->oid, &flags)) {
 			error("bad ref for %s", diter->path.buf);
 			continue;
 		}
@@ -2515,11 +2506,9 @@ static int lock_ref_for_update(struct files_ref_store *refs,
 			 * the transaction, so we have to read it here
 			 * to record and possibly check old_oid:
 			 */
-			int ignore_errno;
 			if (!refs_resolve_ref_unsafe(&refs->base,
 						     referent.buf, 0,
-						     &lock->old_oid, NULL,
-						     &ignore_errno)) {
+						     &lock->old_oid, NULL)) {
 				if (update->flags & REF_HAVE_OLD) {
 					strbuf_addf(err, "cannot lock ref '%s': "
 						    "error reading reference",
@@ -3208,14 +3197,12 @@ static int files_reflog_expire(struct ref_store *ref_store,
 
 		if ((expire_flags & EXPIRE_REFLOGS_UPDATE_REF) &&
 		    !is_null_oid(&cb.last_kept_oid)) {
-			int ignore_errno;
 			int type;
 			const char *ref;
 
 			ref = refs_resolve_ref_unsafe(&refs->base, refname,
 						      RESOLVE_REF_NO_RECURSE,
-						      NULL, &type,
-						      &ignore_errno);
+						      NULL, &type);
 			update = !!(ref && !(type & REF_ISSYMREF));
 		}
 
diff --git a/remote.c b/remote.c
index a6d8ec6c1a..c97c626eaa 100644
--- a/remote.c
+++ b/remote.c
@@ -508,9 +508,8 @@ static void read_config(struct repository *repo)
 
 	repo->remote_state->current_branch = NULL;
 	if (startup_info->have_repository) {
-		int ignore_errno;
 		const char *head_ref = refs_resolve_ref_unsafe(
-			get_main_ref_store(repo), "HEAD", 0, NULL, &flag, &ignore_errno);
+			get_main_ref_store(repo), "HEAD", 0, NULL, &flag);
 		if (head_ref && (flag & REF_ISSYMREF) &&
 		    skip_prefix(head_ref, "refs/heads/", &head_ref)) {
 			repo->remote_state->current_branch = make_branch(
diff --git a/sequencer.c b/sequencer.c
index 5213d16e97..fb978a53a0 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -1281,7 +1281,6 @@ void print_commit_summary(struct repository *r,
 	struct strbuf author_ident = STRBUF_INIT;
 	struct strbuf committer_ident = STRBUF_INIT;
 	struct ref_store *refs;
-	int resolve_errno;
 
 	commit = lookup_commit(r, oid);
 	if (!commit)
@@ -1332,12 +1331,9 @@ void print_commit_summary(struct repository *r,
 	diff_setup_done(&rev.diffopt);
 
 	refs = get_main_ref_store(the_repository);
-	head = refs_resolve_ref_unsafe(refs, "HEAD", 0, NULL, NULL,
-				       &resolve_errno);
-	if (!head) {
-		errno = resolve_errno;
-		die_errno(_("unable to resolve HEAD after creating commit"));
-	}
+	head = refs_resolve_ref_unsafe(refs, "HEAD", 0, NULL, NULL);
+	if (!head)
+		die(_("unable to resolve HEAD after creating commit"));
 	if (!strcmp(head, "HEAD"))
 		head = _("detached HEAD");
 	else
diff --git a/t/helper/test-ref-store.c b/t/helper/test-ref-store.c
index 3e4ddaee70..9646d85fc8 100644
--- a/t/helper/test-ref-store.c
+++ b/t/helper/test-ref-store.c
@@ -180,10 +180,9 @@ static int cmd_resolve_ref(struct ref_store *refs, const char **argv)
 	int resolve_flags = arg_flags(*argv++, "resolve-flags", empty_flags);
 	int flags;
 	const char *ref;
-	int ignore_errno;
 
 	ref = refs_resolve_ref_unsafe(refs, refname, resolve_flags,
-				      &oid, &flags, &ignore_errno);
+				      &oid, &flags);
 	printf("%s %s 0x%x\n", oid_to_hex(&oid), ref ? ref : "(null)", flags);
 	return ref ? 0 : 1;
 }
diff --git a/worktree.c b/worktree.c
index 6f598dcfcd..e8f6f6ae6f 100644
--- a/worktree.c
+++ b/worktree.c
@@ -28,13 +28,11 @@ static void add_head_info(struct worktree *wt)
 {
 	int flags;
 	const char *target;
-	int ignore_errno;
 
 	target = refs_resolve_ref_unsafe(get_worktree_ref_store(wt),
 					 "HEAD",
 					 0,
-					 &wt->head_oid, &flags,
-					 &ignore_errno);
+					 &wt->head_oid, &flags);
 	if (!target)
 		return;
 
@@ -416,7 +414,6 @@ const struct worktree *find_shared_symref(struct worktree **worktrees,
 		const char *symref_target;
 		struct ref_store *refs;
 		int flags;
-		int ignore_errno;
 
 		if (wt->is_bare)
 			continue;
@@ -434,8 +431,7 @@ const struct worktree *find_shared_symref(struct worktree **worktrees,
 
 		refs = get_worktree_ref_store(wt);
 		symref_target = refs_resolve_ref_unsafe(refs, symref, 0,
-							NULL, &flags,
-							&ignore_errno);
+							NULL, &flags);
 		if ((flags & REF_ISSYMREF) &&
 		    symref_target && !strcmp(symref_target, target)) {
 			existing = wt;
@@ -563,7 +559,6 @@ int other_head_refs(each_ref_fn fn, void *cb_data)
 		struct worktree *wt = *p;
 		struct object_id oid;
 		int flag;
-		int ignore_errno;
 
 		if (wt->is_current)
 			continue;
@@ -573,7 +568,7 @@ int other_head_refs(each_ref_fn fn, void *cb_data)
 		if (refs_resolve_ref_unsafe(get_main_ref_store(the_repository),
 					    refname.buf,
 					    RESOLVE_REF_READING,
-					    &oid, &flag, &ignore_errno))
+					    &oid, &flag))
 			ret = fn(refname.buf, &oid, flag, cb_data);
 		if (ret)
 			break;