oidmap: ensure map is initialized

diff --git a/refs.c b/refs.c
index df075fcd06b0826982c94f27ab38395ac7ce30a6..c590a992fb19ce92dcf0932b58f83b65028f8316 100644 (file)
--- a/refs.c
+++ b/refs.c
@@ -1435,8 +1435,21 @@ const char *refs_resolve_ref_unsafe(struct ref_store *refs,
                if (refs_read_raw_ref(refs, refname,
                                      sha1, &sb_refname, &read_flags)) {
                        *flags |= read_flags;
-                       if (errno != ENOENT || (resolve_flags & RESOLVE_REF_READING))
+
+                       /* In reading mode, refs must eventually resolve */
+                       if (resolve_flags & RESOLVE_REF_READING)
+                               return NULL;
+
+                       /*
+                        * Otherwise a missing ref is OK. But the files backend
+                        * may show errors besides ENOENT if there are
+                        * similarly-named refs.
+                        */
+                       if (errno != ENOENT &&
+                           errno != EISDIR &&
+                           errno != ENOTDIR)
                                return NULL;
+
                        hashclr(sha1);
                        if (*flags & REF_BAD_NAME)
                                *flags |= REF_ISBROKEN;