1 files changed, 21 insertions, 0 deletions
diff --git a/scripts/overlay.sh b/scripts/overlay.sh
new file mode 100755
index 0000000..090671c
--- /dev/null
+++ b/scripts/overlay.sh
@@ -0,0 +1,21 @@
+#!/bin/sh
+
+lower=/cfg/preserve/${1}
+upper=/cfg/overlay/${1}
+work=/cfg/overlay/${1}_work
+target=${2}
+
+if [ ! -d "$target" ]; then
+	exit
+fi
+
+if [ -d "$lower" ]; then
+	if [ -d "$upper" ]; then
+		mkdir -p "$work"
+		mount -t overlay overlay \
+			-olowerdir=${lower},upperdir=${upper},workdir=${work} \
+			${target}
+	else
+		mount --bind "$lower" "$target"
+	fi
+fi