Build KarlDNS self-hosted DynDNS service

scripts/uninstall-linux.sh

@@ -0,0 +1,84 @@
+#!/bin/sh
+set -eu
+
+KARLDNS_INSTALL_MODE="${KARLDNS_INSTALL_MODE:-auto}"
+KARLDNS_DELETE_CONFIG="${KARLDNS_DELETE_CONFIG:-0}"
+
+usage() {
+  cat <<'EOF'
+KarlDNS Linux uninstaller
+
+Usage:
+  uninstall-linux.sh [options]
+
+Options:
+  --mode MODE       auto, system, or user. Default: auto
+  --delete-config   Also delete the private updater config and last-IP cache
+  -h, --help        Show this help
+EOF
+}
+
+while [ "$#" -gt 0 ]; do
+  case "$1" in
+    --mode) KARLDNS_INSTALL_MODE="${2:?missing value for --mode}"; shift 2 ;;
+    --delete-config) KARLDNS_DELETE_CONFIG=1; shift ;;
+    -h|--help) usage; exit 0 ;;
+    *) echo "KarlDNS uninstaller: unknown option: $1" >&2; usage >&2; exit 1 ;;
+  esac
+done
+
+remove_user() {
+  config_dir="${XDG_CONFIG_HOME:-$HOME/.config}/karldns"
+  cache_dir="${XDG_CACHE_HOME:-$HOME/.cache}/karldns"
+  updater_path="${HOME}/.local/bin/karldns-update"
+  cron_file="$(mktemp)"
+
+  if command -v crontab >/dev/null 2>&1; then
+    crontab -l 2>/dev/null | awk '
+      $0 == "# karldns-update start" {skip = 1; next}
+      $0 == "# karldns-update end" {skip = 0; next}
+      skip != 1 {print}
+    ' > "$cron_file" || true
+    crontab "$cron_file"
+  fi
+  rm -f "$cron_file" "$updater_path"
+
+  if [ "$KARLDNS_DELETE_CONFIG" = "1" ]; then
+    rm -rf "$config_dir" "$cache_dir"
+  fi
+}
+
+remove_system() {
+  if [ "$(id -u)" -ne 0 ]; then
+    echo "System uninstall needs root. Re-run with sudo or set --mode user." >&2
+    exit 1
+  fi
+
+  rm -f /etc/cron.d/karldns-updater /usr/local/bin/karldns-update
+  if [ "$KARLDNS_DELETE_CONFIG" = "1" ]; then
+    rm -rf /etc/karldns /var/cache/karldns
+  fi
+}
+
+case "$KARLDNS_INSTALL_MODE" in
+  auto)
+    if [ "$(id -u)" -eq 0 ]; then
+      KARLDNS_INSTALL_MODE="system"
+    else
+      KARLDNS_INSTALL_MODE="user"
+    fi
+    ;;
+  user|system) ;;
+  *) echo "KARLDNS_INSTALL_MODE must be auto, user, or system" >&2; exit 1 ;;
+esac
+
+if [ "$KARLDNS_INSTALL_MODE" = "system" ]; then
+  remove_system
+else
+  remove_user
+fi
+
+echo "KarlDNS uninstalled from $KARLDNS_INSTALL_MODE mode."
+if [ "$KARLDNS_DELETE_CONFIG" = "0" ]; then
+  echo "Private config was kept. Re-run with --delete-config to remove it."
+fi