Try to work around most gem/bundle permission errors the easy way.

repos/jekyll/copy/all/usr/jekyll/bin/bundle

 #!/bin/bash
 [ "$DEBUG" = "true" ] && set -x
 exe=/usr/local/bin/bundle
+default-gem-permissions
 set -e
 
 #
@@ -12,17 +13,6 @@ if [[ ! -f "Gemfile" ]] || [ "$(id -u)" != "0" ]; then
    exec $exe "$@"
 fi
 
-#
-# Make sure we have permissions.
-#
-
-if [ "$1" = "install" ] || [ "$1" = "clean" ] || [ "$1" = "update" ]; then
-  if [ "$(stat -c '%U' "$BUNDLE_HOME")" != "jekyll" ]; then
-    chown -R jekyll:jekyll "$BUNDLE_HOME"
-    chown -R jekyll:jekyll /usr/gem
-  fi
-fi
-
 if [ "$1" = "install" ] || [ "$1" = "update" ]; then
   # There is no need to report that we are using check.
   if [ "$1" = "update" ] || ! su-exec jekyll $exe check 1>/dev/null 2>&1; then

repos/jekyll/copy/all/usr/jekyll/bin/default-gem-permissions

+#!/bin/bash
+[ "$DEBUG" = "true" ] && set -x
+set -e
+
+if [ "$(id -u)" = "0" ]; then
+  chown -R jekyll:jekyll "$BUNDLE_HOME"
+  chown -R jekyll:jekyll /usr/gem
+fi

repos/jekyll/copy/all/usr/jekyll/bin/gem

+#!/bin/bash
+[ "$DEBUG" = "true" ] && set -x
+default-gem-permissions
+exe=/usr/local/bin/gem
+set -e
+
+exec $exe "$@"