retisc-backup: Keep sudo session

restic-backup/.local/bin/restic-backup

@@ -4,11 +4,23 @@ set -e
 
 source ~/.config/restic-backup/config.sh
 
+startsudo() {
+    sudo -v
+    ( while true; do sudo -v; sleep 50; done; ) &
+    SUDO_PID="$!"
+}
+stopsudo() {
+    kill "$SUDO_PID"
+    sudo -k
+}
 cleanup() {
   pass gocrypt close || true > /dev/null 2>&1
+  stopsudo
 }
 
-trap cleanup EXIT
+trap cleanup EXIT SIGINT SIGTERM
+
+startsudo
 
 pass gocrypt close > /dev/null 2>&1 || true
 PASS_GOCRYPT_CLOSE_TIMEOUT=2147483648 pass gocrypt open
@@ -22,3 +34,5 @@ for dir in ${RESTIC_BACKUP_SUBVOL_PATHS[@]}; do
   restic-wrapper --verbose backup --exclude-caches "$snap"
   sudo btrfs subvol delete "$snap" || true
 done
+
+stopsudo