adapt the import script to just give us a tarball instead

docker/img2tar.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+#
+# This script imports a raw image into Docker consumeable tarball.  It takes one
+# arguments: the name of the image file
+
+usage() {
+    echo "usage: $(basename $0) <image>"
+    exit 1
+}
+
+image="$1"
+
+if [[ -z $1 ]]; then
+    usage
+fi
+
+mount="$(mktemp -d --tmpdir)"
+mount -o loop "$image" "$mount"
+
+cd "$mount"
+tar -cpSf - --acls --selinux --xattrs * | bzip2 > ${image}.tar.bz2
+cd - >& /dev/null
+umount "$mount"
+rmdir "$mount"