trivial: use git-repo-config to detect if the test can be run on the repository

diff --git a/read-tree.c b/read-tree.c
index 5fdf58d240e68f2c4b332dbdd02be357641127f8..a46c6fe2f5d3234abe5dce0b7a9d44da07b6dae9 100644 (file)
--- a/read-tree.c
+++ b/read-tree.c
@@ -237,6 +237,35 @@ static void reject_merge(struct cache_entry *ce)
            ce->name);
 }
 
+/* Unlink the last component and attempt to remove leading
+ * directories, in case this unlink is the removal of the
+ * last entry in the directory -- empty directories are removed.
+ */
+static void unlink_entry(char *name)
+{
+       char *cp, *prev;
+
+       if (unlink(name))
+               return;
+       prev = NULL;
+       while (1) {
+               int status;
+               cp = strrchr(name, '/');
+               if (prev)
+                       *prev = '/';
+               if (!cp)
+                       break;
+
+               *cp = 0;
+               status = rmdir(name);
+               if (status) {
+                       *cp = '/';
+                       break;
+               }
+               prev = cp;
+       }
+}
+
 static void check_updates(struct cache_entry **src, int nr)
 {
        static struct checkout state = {
@@ -250,7 +279,7 @@ static void check_updates(struct cache_entry **src, int nr)
                struct cache_entry *ce = *src++;
                if (!ce->ce_mode) {
                        if (update)
-                               unlink(ce->name);
+                               unlink_entry(ce->name);
                        continue;
                }
                if (ce->ce_flags & mask) {
@@ -265,17 +294,20 @@ static int unpack_trees(merge_fn_t fn)
 {
        int indpos = 0;
        unsigned len = object_list_length(trees);
-       struct tree_entry_list **posns = 
-               xmalloc(len * sizeof(struct tree_entry_list *));
+       struct tree_entry_list **posns;
        int i;
        struct object_list *posn = trees;
        merge_size = len;
-       for (i = 0; i < len; i++) {
-               posns[i] = ((struct tree *) posn->item)->entries;
-               posn = posn->next;
+
+       if (len) {
+               posns = xmalloc(len * sizeof(struct tree_entry_list *));
+               for (i = 0; i < len; i++) {
+                       posns[i] = ((struct tree *) posn->item)->entries;
+                       posn = posn->next;
+               }
+               if (unpack_trees_rec(posns, len, "", fn, &indpos))
+                       return -1;
        }
-       if (unpack_trees_rec(posns, len, "", fn, &indpos))
-               return -1;
 
        if (trivial_merges_only && nontrivial_merge)
                die("Merge requires file-level merging");
@@ -600,10 +632,14 @@ int main(int argc, char **argv)
        unsigned char sha1[20];
        merge_fn_t fn = NULL;
 
+       setup_git_directory();
+
        newfd = hold_index_file_for_update(&cache_file, get_index_file());
        if (newfd < 0)
                die("unable to create new cachefile");
 
+       git_config(git_default_config);
+
        merge = 0;
        reset = 0;
        for (i = 1; i < argc; i++) {