Move the cache hook to repo.postsync.d and adjust it accordingly

etc/portage/check-portdir.sh

@@ -1,9 +0,0 @@
-#!/bin/bash
-
-source /etc/portage/util-functions.sh
-
-if [[ -z ${PORTDIR} || "$(dirname ${PORTDIR})" == "/" ]] ; then
-	die "PORTDIR empty or pointing to root!"
-elif [[ ! -e ${PORTDIR} ]] ; then
-	die "${PORTDIR} does not exist!"
-fi

etc/portage/postsync.d/sync_cache

@@ -1,25 +0,0 @@
-#!/bin/bash
-
-source /etc/portage/check-portdir.sh
-source /etc/init.d/functions.sh
-source /etc/portage/util-functions.sh
-
-# You may change this to only update cache of specific repositories.
-# Should at least include 'gentoo'. Default is all repositories.
-repository_list=( $(portageq get_repos /) )
-
-# Number of jobs for egencache, default is number or processors.
-parallel_jobs="$(nproc)"
-
-
-ebegin "Fetching pre-generated metadata cache for gentoo repository"
-rsync -aq rsync://rsync.gentoo.org/gentoo-portage/metadata/md5-cache/ "${PORTDIR}"/metadata/md5-cache/
-eend $?
-
-einfo "Updating metadata cache for repositories:"
-for repo in "${repository_list[@]}"; do
-	ebegin "  ${repo}"
-	egencache --jobs="${parallel_jobs}" --repo="${repo}" --update --update-use-local-desc
-	eend $?
-done
-

etc/portage/repo.postsync.d/sync_gentoo_cache

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+source /etc/init.d/functions.sh
+source /etc/portage/util-functions.sh
+
+repository_name=${1}
+repository_path=${3}
+
+# Number of jobs for egencache, default is number or processors.
+parallel_jobs="$(nproc)"
+
+if [ "${repository_name}" == "gentoo" ]; then
+	ebegin "Fetching pre-generated metadata cache for ${repository_name}"
+	rsync -aq rsync://rsync.gentoo.org/gentoo-portage/metadata/md5-cache/ "${repository_path}"/metadata/md5-cache/
+	eend $?
+
+	ebegin "Updating metadata cache for ${repository_name}"
+	egencache --jobs="${parallel_jobs}" --repo="${repository_name}" --update --update-use-local-desc
+	eend $?
+fi