fix chroot_lock reference

Signed-off-by: Gui Chen <gui.chen@intel.com>

diff --git a/mic/chroot.py b/mic/chroot.py
index 342b5e8..4e4120d 100644 (file)
--- a/mic/chroot.py
+++ b/mic/chroot.py
@@ -222,6 +222,8 @@ def cleanup_mounts(chrootdir):
 
 def cleanup_chrootenv(chrootdir, bindmounts=None, globalmounts=()):
     """ clean up chroot environment """
+    global chroot_lock
+
     # kill processes
     kill_proc_inchroot(chrootdir)
     # clean mtab