Add installer uninstall mode

install.sh

@@ -2,11 +2,12 @@
 set -eu
 
 REPO="${CLICD_REPO:-MengMengCode/CLICD}"
-VERSION="${CLICD_VERSION:-latest}"
+CLICD_INSTALL_VERSION="${CLICD_VERSION:-latest}"
 ASSET="clicd-linux-amd64.tar.gz"
+ACTION="${1:-install}"
 
 echo "====================================="
-echo "  CLICD Installation"
+echo "  CLICD Installer"
 echo "====================================="
 
 log() {
@@ -33,6 +34,7 @@ is_openrc() {
 if [ "$(id -u)" -ne 0 ]; then
     echo "Please run as root: sudo ./install.sh"
     echo "Or: curl -fsSL https://raw.githubusercontent.com/${REPO}/main/install.sh | sudo sh"
+    echo "Uninstall: curl -fsSL https://raw.githubusercontent.com/${REPO}/main/install.sh | sudo sh -s -- uninstall"
     exit 1
 fi
 
@@ -44,6 +46,130 @@ if [ -r /etc/os-release ]; then
     OS_LIKE="${ID_LIKE:-}"
 fi
 
+usage() {
+    cat << EOF
+Usage:
+  ./install.sh
+  ./install.sh uninstall [--purge-data] [--delete-containers]
+
+Environment:
+  CLICD_REPO=owner/repo
+  CLICD_VERSION=latest|v1.0.0
+
+Examples:
+  curl -fsSL https://raw.githubusercontent.com/${REPO}/main/install.sh | sudo sh
+  curl -fsSL https://raw.githubusercontent.com/${REPO}/main/install.sh | sudo sh -s -- uninstall
+EOF
+}
+
+remove_path() {
+    path="$1"
+    if [ ! -e "$path" ] && [ ! -L "$path" ]; then
+        return
+    fi
+    rm -rf "$path"
+    log "Removed $path"
+}
+
+uninstall_clicd() {
+    purge_data=0
+    delete_containers=0
+
+    shift || true
+    while [ "$#" -gt 0 ]; do
+        case "$1" in
+            --purge-data)
+                purge_data=1
+                ;;
+            --delete-containers)
+                delete_containers=1
+                ;;
+            -h|--help)
+                usage
+                exit 0
+                ;;
+            *)
+                die "Unknown uninstall option: $1"
+                ;;
+        esac
+        shift
+    done
+
+    log "Uninstalling CLICD..."
+
+    if has_cmd systemctl; then
+        systemctl stop clicd >/dev/null 2>&1 || true
+        systemctl disable clicd >/dev/null 2>&1 || true
+    fi
+
+    if has_cmd rc-service; then
+        rc-service clicd stop >/dev/null 2>&1 || true
+    fi
+    if has_cmd rc-update; then
+        rc-update del clicd default >/dev/null 2>&1 || true
+    fi
+
+    if [ "$delete_containers" -eq 1 ]; then
+        log "Destroying CLICD-style LXC containers named ct-*..."
+        for container_dir in /var/lib/lxc/ct-*; do
+            [ -d "$container_dir" ] || continue
+            container_name="$(basename "$container_dir")"
+            lxc-stop -n "$container_name" -k >/dev/null 2>&1 || true
+            lxc-destroy -n "$container_name" -f >/dev/null 2>&1 || true
+            remove_path "$container_dir"
+        done
+    fi
+
+    remove_path /etc/systemd/system/clicd.service
+    remove_path /etc/init.d/clicd
+    remove_path /usr/local/bin/clicd
+    remove_path /etc/sysctl.d/99-clicd.conf
+    remove_path /var/log/clicd.log
+    remove_path /var/log/clicd.err
+
+    if [ "$purge_data" -eq 1 ]; then
+        remove_path /root/.clicd
+    fi
+
+    if has_cmd systemctl; then
+        systemctl daemon-reload >/dev/null 2>&1 || true
+        systemctl reset-failed clicd >/dev/null 2>&1 || true
+    fi
+    if has_cmd sysctl; then
+        sysctl --system >/dev/null 2>&1 || true
+    fi
+
+    echo ""
+    echo "====================================="
+    echo "  CLICD Uninstalled"
+    echo "====================================="
+    if [ "$purge_data" -eq 0 ]; then
+        echo "  Kept data: /root/.clicd"
+    fi
+    if [ "$delete_containers" -eq 0 ]; then
+        echo "  Kept LXC containers: /var/lib/lxc"
+        echo "  To delete CLICD-style ct-* containers too:"
+        echo "    ./install.sh uninstall --delete-containers"
+    fi
+    echo "====================================="
+}
+
+case "$ACTION" in
+    install|"")
+        ;;
+    uninstall|remove)
+        uninstall_clicd "$@"
+        exit 0
+        ;;
+    -h|--help|help)
+        usage
+        exit 0
+        ;;
+    *)
+        die "Unknown action: $ACTION"
+        ;;
+esac
+
 install_apk() {
     log "Installing dependencies with apk..."
     apk update
@@ -264,10 +390,10 @@ download_release_if_needed() {
         return
     fi
 
-    if [ "$VERSION" = "latest" ]; then
+    if [ "$CLICD_INSTALL_VERSION" = "latest" ]; then
         download_url="https://github.com/${REPO}/releases/latest/download/${ASSET}"
     else
-        download_url="https://github.com/${REPO}/releases/download/${VERSION}/${ASSET}"
+        download_url="https://github.com/${REPO}/releases/download/${CLICD_INSTALL_VERSION}/${ASSET}"
     fi
 
     log "clicd binary not found in current directory."