thin manifest: script which doing the Manifest cleanup

why I wrote this script, since I don't have all the packages sources!@

the goal of this scrtipt is :
1) clean all file's checksum which already managed by git
  (means file's checksum belong to this overlay will be removed)
2) keep the source code/tarballs/patch which should fetch from external
  (means file not belong to this overlay need to be preserved)

hope I don't break anything

Signed-off-by: Lan Yixun <dennis.yxun@gmail.com>

scripts/thin_manifest_clean.sh

@@ -0,0 +1,39 @@
+#!/bin/bash
+
+. /etc/init.d/functions.sh
+
+
+OVERLAY=/var/lib/layman/gentoo-zh
+
+einfo "clean thin Manifest"
+
+remove() {
+M=$1/Manifest
+if [[ ! -e ${M} ]]; then
+#	ewarn "$(basename $1) not exist"
+	return
+fi
+einfo "$2: clean up: $(basename $1)"
+sed -i -e '/ebuild/d' $M
+sed -i -e '/metadata/d' $M
+sed -i -e '/ChangeLog/d' $M
+
+if [[ -d $1/files ]]; then
+	for i in $(find $1/files -type f ); do
+		V=${i##*\/}
+		sed -i -e "/${V}/d" $M
+	done 
+fi
+
+sed -i -e '/^$/d' $M
+if [[ ! -s ${M} ]]; then
+#	einfo "remove empty: $M"
+	rm $M
+fi
+}
+
+C=0
+for i in $(find ${OVERLAY}  -maxdepth 2 -and -type d) ; do
+	C=$((C+1))
+	remove $i $C
+done