get_ref_dir(): return early if directory cannot be read

diff --git a/unpack-trees.c b/unpack-trees.c
index 7c9ecf665d062d79e9208875d9bf2577e98f4fb2..36523da22aedba160c5a29f95bf339f05dfc6feb 100644 (file)
--- a/unpack-trees.c
+++ b/unpack-trees.c
@@ -102,21 +102,28 @@ void setup_unpack_trees_porcelain(struct unpack_trees_options *opts,
                opts->unpack_rejects[i].strdup_strings = 1;
 }
 
-static void add_entry(struct unpack_trees_options *o, struct cache_entry *ce,
-       unsigned int set, unsigned int clear)
+static void do_add_entry(struct unpack_trees_options *o, struct cache_entry *ce,
+                        unsigned int set, unsigned int clear)
 {
-       unsigned int size = ce_size(ce);
-       struct cache_entry *new = xmalloc(size);
-
        clear |= CE_HASHED | CE_UNHASHED;
 
        if (set & CE_REMOVE)
                set |= CE_WT_REMOVE;
 
+       ce->next = NULL;
+       ce->ce_flags = (ce->ce_flags & ~clear) | set;
+       add_index_entry(&o->result, ce,
+                       ADD_CACHE_OK_TO_ADD | ADD_CACHE_OK_TO_REPLACE);
+}
+
+static void add_entry(struct unpack_trees_options *o, struct cache_entry *ce,
+       unsigned int set, unsigned int clear)
+{
+       unsigned int size = ce_size(ce);
+       struct cache_entry *new = xmalloc(size);
+
        memcpy(new, ce, size);
-       new->next = NULL;
-       new->ce_flags = (new->ce_flags & ~clear) | set;
-       add_index_entry(&o->result, new, ADD_CACHE_OK_TO_ADD|ADD_CACHE_OK_TO_REPLACE);
+       do_add_entry(o, new, set, clear);
 }
 
 /*
@@ -587,7 +594,7 @@ static int unpack_nondirectories(int n, unsigned long mask,
 
        for (i = 0; i < n; i++)
                if (src[i] && src[i] != o->df_conflict_entry)
-                       add_entry(o, src[i], 0, 0);
+                       do_add_entry(o, src[i], 0, 0);
        return 0;
 }
 
@@ -772,7 +779,7 @@ static int unpack_callback(int n, unsigned long mask, unsigned long dirmask, str
        if (unpack_nondirectories(n, mask, dirmask, src, names, info) < 0)
                return -1;
 
-       if (src[0]) {
+       if (o->merge && src[0]) {
                if (ce_stage(src[0]))
                        mark_ce_used_same_name(src[0], o);
                else