1 files changed, 46 insertions, 0 deletions
diff --git a/community/lxcfs/chownmap b/community/lxcfs/chownmap
new file mode 100644
index 0000000000..07e5aea20b
--- /dev/null
+++ b/community/lxcfs/chownmap
@@ -0,0 +1,46 @@
+#!/bin/sh
+# author: Mirek Kratochvil
+# https://github.com/exaexa/chownmap
+
+help_exit () {
+	echo "usage: $0 <from> <to> <length> [ files ] ..."
+	exit $1
+}
+
+FROM="$1"
+[ -n "$FROM" ] || help_exit 0
+[ "$FROM" -ge 0 ] || help_exit 1
+
+TO="$2"
+[ -n "$TO" ] || help_exit 0
+[ "$TO" -ge 0 ] || help_exit 1
+
+LEN="$3"
+[ -n "$LEN" ] || help_exit 0
+[ "$LEN" -gt 0 ] || help_exit 1
+
+[ -n "$4" ] || help_exit 0
+
+shift 3
+
+LAST=$(( FROM + LEN ))
+CHANGE=$(( TO - FROM ))
+CHOWN_EXTRA_OPTS=${CHOWN_EXTRA_OPTS:-}
+
+do_dir () {
+	find "$1" |while read fn ; do
+		stat "$fn" -c"%u %g" | {
+			read uid gid
+			chuid=$uid
+			chgid=$gid
+			[[ $chuid -ge $FROM && $chuid -lt $LAST ]] && chuid=$(( chuid + CHANGE ))
+			[[ $chgid -ge $FROM && $chgid -lt $LAST ]] && chgid=$(( chgid + CHANGE ))
+			[[ $uid -ne $chuid || $gid -ne $chgid ]] && chown $CHOWN_EXTRA_OPTS -h $chuid:$chgid "$fn"
+		}
+	done
+}
+
+while [ -n "$1" ] ; do
+	do_dir "$1"
+	shift
+done