memory_limit: use git_env_ulong() to parse GIT_ALLOC_LIMIT

diff --git a/builtin/read-tree.c b/builtin/read-tree.c
index 3204c62eaf26d0db69d360695725e4b51ca686e1..e7e1c33a7fb1f1eb7828f4d632fb492f128f66fe 100644 (file)
--- a/builtin/read-tree.c
+++ b/builtin/read-tree.c
@@ -155,6 +155,15 @@ int cmd_read_tree(int argc, const char **argv, const char *unused_prefix)
        if (1 < opts.merge + opts.reset + prefix_set)
                die("Which one? -m, --reset, or --prefix?");
 
+       /*
+        * NEEDSWORK
+        *
+        * The old index should be read anyway even if we're going to
+        * destroy all index entries because we still need to preserve
+        * certain information such as index version or split-index
+        * mode.
+        */
+
        if (opts.reset || opts.merge || opts.prefix) {
                if (read_cache_unmerged() && (opts.prefix || opts.merge))
                        die("You need to resolve your current index first");