Merge pull request #4348 from tianon/fix-yum-tagging

Update mkimage-yum to not read /etc/redhat-release from the host
Upstream-commit: b5ba89596e6f731cf3f561a07276920401d43edf
Component: engine

components/engine/contrib/mkimage-yum.sh

@@ -76,7 +76,7 @@ rm -rf "$target"/var/cache/ldconfig/*
 
 version=
 if [ -r "$target"/etc/redhat-release ]; then
-    version="$(sed 's/^[^0-9\]*\([0-9.]\+\).*$/\1/' /etc/redhat-release)"
+    version="$(sed 's/^[^0-9\]*\([0-9.]\+\).*$/\1/' "$target"/etc/redhat-release)"
 fi
 
 if [ -z "$version" ]; then