egencache: ensure correct porttrees

The GenCache class assumes that portdb.porttrees[0] is the desired
tree, so assert that it is true. The behavior should have already been
correct, since PORTDIR_OVERLAY was already set to an empty string when
necessary.

diff --git a/bin/egencache b/bin/egencache
index 01eadf053cff2430db61ab966462202b00642b1b..22ce8ec33c23783788809bb07406ae07f9d1b4fb 100755 (executable)
--- a/bin/egencache
+++ b/bin/egencache
@@ -864,6 +864,8 @@ def egencache_main(args):
 
                # Limit ebuilds to the specified repo.
                portdb.porttrees = [repo_path]
+       else:
+               portdb.porttrees = [portdb.porttree_root]
 
        ret = [os.EX_OK]