Add CONTAINER_NAME to BASE_IMAGE_COPY value
diff --git a/tools/build_kvm.sh b/tools/build_kvm.sh
index 207f86b..7511898 100755
--- a/tools/build_kvm.sh
+++ b/tools/build_kvm.sh
@@ -45,14 +45,14 @@
DIST_NAME=${DIST_NAME:-natty}
IMAGE_FNAME=$DIST_NAME.raw
+# Name of our instance, used by libvirt
+CONTAINER_NAME=${CONTAINER_NAME:-kvmstack}
+
# Original version of built image
BASE_IMAGE=$KVMSTACK_DIR/images/natty.raw
# Copy of base image, which we pre-install with tasty treats
-BASE_IMAGE_COPY=$IMAGES_DIR/$DIST_NAME.raw.copy
-
-# Name of our instance, used by libvirt
-CONTAINER_NAME=${CONTAINER_NAME:-kvmstack}
+BASE_IMAGE_COPY=$IMAGES_DIR/$DIST_NAME.$CONTAINER_NAME.raw.copy
# Mop up after previous runs
virsh destroy $CONTAINER_NAME