1 files changed, 34 insertions, 0 deletions
diff --git a/tools/gerrit-update.nix b/tools/gerrit-update.nix
new file mode 100644
index 000000000000..e4efd89ea597
--- /dev/null
+++ b/tools/gerrit-update.nix
@@ -0,0 +1,34 @@
+# Utility script to perform a Gerrit update.
+{ pkgs, ... }:
+
+pkgs.writeShellScriptBin "gerrit-update" ''
+  set -euo pipefail
+
+  if [[ $EUID -ne 0 ]]; then
+    echo "Oh no! Only root is allowed to update Gerrit!" >&2
+    exit 1
+  fi
+
+  gerrit_war="$(find "${pkgs.gerrit}/webapps" -name 'gerrit*.war')"
+  java="${pkgs.jdk}/bin/java"
+  backup_path="/root/gerrit_preupgrade-$(date +"%Y-%m-%d").tar.bz2"
+
+  # Take a safety backup of Gerrit into /root's homedir. Just in case.
+  echo "Backing up Gerrit to $backup_path"
+  tar -cjf "$backup_path" /var/lib/gerrit
+
+  # Stop Gerrit (and its activation socket).
+  echo "Stopping Gerrit"
+  systemctl stop gerrit.service gerrit.socket
+
+  # Ask Gerrit to do a schema upgrade...
+  echo "Performing schema upgrade"
+  "$java" -jar "$gerrit_war" \
+    init --no-auto-start --batch --skip-plugins --site-path "/var/lib/gerrit"
+
+  # Restart Gerrit.
+  echo "Restarting Gerrit"
+  systemctl start gerrit.socket gerrit.service
+
+  echo "...done"
+''