Use our own example script for overlays

README.md

@@ -10,12 +10,8 @@ necessary to set up a gentoo github mirror based sync system:
 
 ## Notes ##
 
-Note that typically most repositories other than `gentoo` don't come with a
-pregenerated cache. It is a good idea to generate/update their cache every
-time they are synced. One way to do this, is by activating the `example` hook
-script that portage installs by default in `/etc/portage/postsync.d`:
-
-```
-cp -i /etc/portage/repo.postsync.d/example /etc/portage/repo.postsync.d/gen_cache
-chmod +x /etc/portage/repo.postsync.d/gen_cache
+If you want your overlay metadata caches to be automatically regenerated
+as well, do:
+```sh
+chmod +x /etc/portage/repo.postsync.d/sync_overlay_cache
 ```

etc/portage/repo.postsync.d/sync_overlay_cache

@@ -0,0 +1,14 @@
+#!/bin/bash
+
+repository_name="${1}"
+
+[[ ${repository_name} == "gentoo" ]] && exit 0
+
+source /lib/gentoo/functions.sh
+
+# Number of jobs for egencache, default is number or processors.
+parallel_jobs="$(nproc)"
+
+ebegin "Updating metadata cache for ${repository_name}"
+egencache --jobs="${parallel_jobs}" --repo="${repository_name}" --update --update-use-local-desc
+eend $?