Ensure loop ready

alpine/build-rootfs.sh

@@ -2,6 +2,8 @@
 
 set -euo pipefail
 
+source /utils.sh
+
 /preload-k8s-images.sh || exit 1
 
 export CTL_BIN_LAYER=$( skopeo inspect docker-daemon:localhost/monok8s/node-control:dev | jq -r '.Layers[0] | sub("^sha256:"; "")' )
@@ -197,6 +199,8 @@ sgdisk -o "$IMG" \
   -n 3:0:+2560M   -t 3:8300 -c 3:rootfsB \
   -n 4:0:0        -t 4:8300 -c 4:data
 
+ensure_loop_ready
+
 losetup -D
 LOOP=$(losetup --find --show -P "$IMG")
 /sync-loop.sh "$LOOP"