saving uncommitted changes in /etc prior to emerge run

paludis/hooks/sync_all_post/01-sync_cache.bash

@@ -0,0 +1,24 @@
+#!/bin/bash
+
+source "${PALUDIS_EBUILD_DIR}/echo_functions.bash"
+source "/etc/paludis/hooks/set_portdir.bash"
+
+# you may change this to only update cache of specific overlays
+overlay_list=(
+	$(${CAVE} print-repositories | grep -vE '(^gentoo$|^installed$|^installed-unpackaged$|^layman$|^paludis-overlay$|^repository$)')
+)
+
+ebegin "Syncing metadata cache for gentoo repository"
+#rsync -avPq rsync://rsync.gentoo.org/gentoo-portage/metadata/md5-cache/ "${PORTDIR}"/metadata/md5-cache/
+egencache --jobs=$(nproc) --repo=gentoo --update --update-use-local-desc
+eend $?
+
+if [[ ${#overlay_list[@]} -gt 0 ]] ; then
+	ebegin "Syncing metadata cache for overlays"
+	for _overlay in ${overlay_list[@]} ; do
+		einfo "  ${_overlay}"
+		egencache --jobs=$(nproc) --repo=${_overlay} --update --update-use-local-desc
+	done
+	eend $?
+fi
+