[PATCH] cnf/repo.postsync.d/example: add egencache --update-pkg-desc-index (bug 735626)

Add an egencache --update-pkg-desc-index example for users
of app-portage/esearch to migrate to.

Bug: https://bugs.gentoo.org/735626
Signed-off-by: Zac Medico <[email protected]>
---
 cnf/repo.postsync.d/example | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/cnf/repo.postsync.d/example b/cnf/repo.postsync.d/example
index 533bf719c..6c349ab3c 100644
--- a/cnf/repo.postsync.d/example
+++ b/cnf/repo.postsync.d/example
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # Example /etc/portage/repo.postsync.d script. Make it executable (chmod +x) for
 # Portage to process it.
 #
@@ -45,6 +45,19 @@ if [ -n "${repository_name}" ]; then
 			ret=1
 		fi
 	fi
+
+	# Regenerate the metadata/pkg_desc_index file if needed. It's not
+	# needed for https://gitweb.gentoo.org/repo/sync/gentoo.git which
+	# provides a freshly generated copy.
+	if [[ ! -e ${repository_path}/metadata/pkg_desc_index || (
+		-d ${repository_path}/metadata/md5-cache &&
+		-n "$(find "${repository_path}/metadata/md5-cache" -type f -newer "${repository_path}/metadata/pkg_desc_index" -print -quit)" ) ]]; then
+		if ! egencache --update-pkg-desc-index --repo="${repository_name}"
+		then
+			echo "!!! egencache failed!"
+			ret=1
+		fi
+	fi
 fi
 
 # Return explicit status.
-- 
2.25.3