Prepare KarlDNS production deployment

scripts/uninstall-linux.sh

@@ -48,6 +48,33 @@ remove_user() {
   fi
 }
 
+remove_marked_crontab_file() {
+  cron_file="$1"
+  [ -f "$cron_file" ] || return 0
+  tmp_file="$(mktemp)"
+  awk '
+    $0 == "# karldns-update start" {skip = 1; next}
+    $0 == "# karldns-update end" {skip = 0; next}
+    skip != 1 {print}
+  ' "$cron_file" > "$tmp_file"
+  cat "$tmp_file" > "$cron_file"
+  rm -f "$tmp_file"
+}
+
+remove_marked_root_crontab() {
+  if ! command -v crontab >/dev/null 2>&1; then
+    return 0
+  fi
+  tmp_file="$(mktemp)"
+  crontab -l 2>/dev/null | awk '
+    $0 == "# karldns-update start" {skip = 1; next}
+    $0 == "# karldns-update end" {skip = 0; next}
+    skip != 1 {print}
+  ' > "$tmp_file" || true
+  crontab "$tmp_file"
+  rm -f "$tmp_file"
+}
+
 remove_system() {
   if [ "$(id -u)" -ne 0 ]; then
     echo "System uninstall needs root. Re-run with sudo or set --mode user." >&2
@@ -55,6 +82,8 @@ remove_system() {
   fi
 
   rm -f /etc/cron.d/karldns-updater /usr/local/bin/karldns-update
+  remove_marked_crontab_file /etc/crontabs/root
+  remove_marked_root_crontab
   if [ "$KARLDNS_DELETE_CONFIG" = "1" ]; then
     rm -rf /etc/karldns /var/cache/karldns
   fi