saving uncommitted changes in /etc prior to emerge run

paludis/hooks/sync_all_post/sync_cache.bash

@@ -1,13 +1,34 @@
 #!/bin/bash
 
 source "${PALUDIS_EBUILD_DIR}/echo_functions.bash"
-source "${PALUDIS_EBUILD_DIR}/die_functions.bash"
 source "/etc/paludis/hooks/set_portdir.bash"
 
+overlay_list=(
+	arx-libertatis
+	desktop-overlay
+	dotnet
+	games-overlay
+	haskell
+	hasufell-overlay
+	libressl
+	media-overlay
+	prism-overlay
+	qt
+	torbrowser
+	tox-overlay
+)
 
-einfo "syncing metadata cache"
+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
 
-for i in gentoo games-overlay desktop-overlay media-overlay prism-overlay libressl arx-libertatis dotnet haskell qt sage-on-gentoo torbrowser tox-overlay hasufell-overlay; do
-	egencache --jobs=8 --repo=${i} --update --update-use-local-desc \
-		|| die "egencache failed for overlay ${i}!"
-done