Check that the type of the tree really is a tree and not a commit as it seems to...

diff --git a/git-subtree.sh b/git-subtree.sh
index b7c741c..454ce7e 100755 (executable)
--- a/git-subtree.sh
+++ b/git-subtree.sh
@@ -322,6 +322,7 @@ subtree_for_commit()
        git ls-tree "$commit" -- "$dir" |
        while read mode type tree name; do
                assert [ "$name" = "$dir" ]
+               assert [ "$type" = "tree" ]
                echo $tree
                break
        done