From 064181815eaaa7c173e02a038985a57709cca426 Mon Sep 17 00:00:00 2001
From: Martin Gruner <mg@zammad.com>
Date: Mon, 21 Jun 2021 11:47:56 +0000
Subject: [PATCH] Fixes #3629: Updating package-based installations can break
 the front end.

---
 .pkgr.yml                         |  1 +
 contrib/packager.io/preinstall.sh | 12 ++++++++++++
 2 files changed, 13 insertions(+)
 create mode 100755 contrib/packager.io/preinstall.sh

diff --git a/.pkgr.yml b/.pkgr.yml
index d0e9c4db2..2a9afa6da 100644
--- a/.pkgr.yml
+++ b/.pkgr.yml
@@ -116,4 +116,5 @@ env:
   - ZAMMAD_WEBSOCKET_PORT=6042
 services:
   - postgres
+before_install: contrib/packager.io/preinstall.sh
 after_install: contrib/packager.io/postinstall.sh
diff --git a/contrib/packager.io/preinstall.sh b/contrib/packager.io/preinstall.sh
new file mode 100755
index 000000000..00940c560
--- /dev/null
+++ b/contrib/packager.io/preinstall.sh
@@ -0,0 +1,12 @@
+#!/bin/bash
+#
+# packager.io preinstall script
+#
+
+#
+# Make sure that after installation/update there can be only one sprockets manifest,
+#   the one coming from the package. The package manager will ignore any duplicate files
+#   which might come from a backup restore and/or a manual 'assets:precompile' command run.
+#   These duplicates can cause the application to fail, however.
+#
+rm -f /opt/zammad/public/assets/.sprockets-manifest-*.json || true
\ No newline at end of file