ext

packages/system/gnome-nebula-vpn/default.nix

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+{
+  stdenvNoCC,
+  lib,
+  ...
+}:
+
+stdenvNoCC.mkDerivation {
+  pname = "gnome-nebula-vpn";
+  version = "1.0.0";
+
+  src = ./extension;
+
+  installPhase = ''
+    runHook preInstall
+
+    uuid="nebula-vpn-status@mjallen"
+    dest="$out/share/gnome-shell/extensions/$uuid"
+    mkdir -p "$dest"
+    cp -r . "$dest/"
+
+    runHook postInstall
+  '';
+
+  meta = {
+    description = "GNOME Shell extension showing Nebula VPN status with interface info and a toggle";
+    license = lib.licenses.mit;
+    platforms = lib.platforms.linux;
+  };
+}

packages/system/gnome-nebula-vpn/extension/extension.js

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+import GLib from 'gi://GLib';
+import Gio from 'gi://Gio';
+import GObject from 'gi://GObject';
+import St from 'gi://St';
+import Clutter from 'gi://Clutter';
+
+import {Extension} from 'resource:///org/gnome/shell/extensions/extension.js';
+import * as Main from 'resource:///org/gnome/shell/ui/main.js';
+import * as PanelMenu from 'resource:///org/gnome/shell/ui/panelMenu.js';
+import * as PopupMenu from 'resource:///org/gnome/shell/ui/popupMenu.js';
+
+// ── constants ────────────────────────────────────────────────────────────────
+
+const SERVICE_NAME = 'nebula@jallen-nebula.service';
+const IFACE_NAME   = 'jallen-nebula';
+
+const POLL_INTERVAL_SECS = 5;
+
+// ── helpers ──────────────────────────────────────────────────────────────────
+
+/**
+ * Run a command and return { success, stdout, stderr }.
+ * The command is passed as an argv array (no shell expansion).
+ */
+function runCommand(argv) {
+    try {
+        const [ok, stdout, stderr, exitCode] = GLib.spawn_sync(
+            null,           // working dir
+            argv,
+            null,           // inherit env
+            GLib.SpawnFlags.SEARCH_PATH,
+            null,
+        );
+        return {
+            success: ok && exitCode === 0,
+            stdout: ok ? new TextDecoder().decode(stdout).trim() : '',
+            stderr: ok ? new TextDecoder().decode(stderr).trim() : '',
+        };
+    } catch (_e) {
+        return {success: false, stdout: '', stderr: ''};
+    }
+}
+
+/** Return true if the systemd service is currently active. */
+function isServiceActive() {
+    const r = runCommand([
+        'systemctl', 'is-active', '--quiet', SERVICE_NAME,
+    ]);
+    return r.success;
+}
+
+/**
+ * Get interface info for IFACE_NAME.
+ * Returns { found, ipv4, ipv6 } where ipv4/ipv6 are strings or null.
+ */
+function getIfaceInfo() {
+    // `ip -brief addr show <iface>` output:
+    //   jallen-nebula    UP   10.1.1.3/24  fe80::…/64
+    const r = runCommand(['ip', '-brief', 'addr', 'show', IFACE_NAME]);
+    if (!r.success || r.stdout === '') {
+        return {found: false, ipv4: null, ipv6: null};
+    }
+
+    const parts  = r.stdout.split(/\s+/);
+    // parts[0] = iface, parts[1] = state, parts[2..] = addresses
+    const addrs  = parts.slice(2);
+    const ipv4   = addrs.find(a => /^\d+\.\d+\.\d+\.\d+\//.test(a)) ?? null;
+    const ipv6   = addrs.find(a => a.includes(':') && !a.startsWith('fe80')) ?? null;
+    return {found: true, ipv4, ipv6};
+}
+
+/** Start or stop the systemd service (requires polkit / passwordless sudo). */
+function setServiceActive(enable) {
+    const action = enable ? 'start' : 'stop';
+    runCommand(['systemctl', action, SERVICE_NAME]);
+}
+
+// ── indicator ────────────────────────────────────────────────────────────────
+
+const NebulaIndicator = GObject.registerClass(
+class NebulaIndicator extends PanelMenu.Button {
+    _init(extensionPath) {
+        super._init(0.0, 'Nebula VPN Status');
+
+        this._extensionPath = extensionPath;
+
+        // ── panel icon + label ──
+        const hbox = new St.BoxLayout({style_class: 'panel-status-menu-box'});
+
+        this._icon = new St.Icon({
+            style_class: 'system-status-icon',
+            icon_size: 16,
+        });
+
+        this._label = new St.Label({
+            text: '…',
+            y_align: Clutter.ActorAlign.CENTER,
+            style: 'margin-left: 4px; margin-right: 2px;',
+        });
+
+        hbox.add_child(this._icon);
+        hbox.add_child(this._label);
+        this.add_child(hbox);
+
+        // ── dropdown menu ──
+        this._statusItem = new PopupMenu.PopupMenuItem('', {reactive: false});
+        this._statusItem.label.set_style('font-weight: bold;');
+        this.menu.addMenuItem(this._statusItem);
+
+        this._ipv4Item = new PopupMenu.PopupMenuItem('', {reactive: false});
+        this.menu.addMenuItem(this._ipv4Item);
+
+        this._ipv6Item = new PopupMenu.PopupMenuItem('', {reactive: false});
+        this.menu.addMenuItem(this._ipv6Item);
+
+        this.menu.addMenuItem(new PopupMenu.PopupSeparatorMenuItem());
+
+        this._toggleItem = new PopupMenu.PopupMenuItem('');
+        this._toggleItem.connect('activate', () => this._onToggle());
+        this.menu.addMenuItem(this._toggleItem);
+
+        this.menu.addMenuItem(new PopupMenu.PopupSeparatorMenuItem());
+
+        const refreshItem = new PopupMenu.PopupMenuItem('Refresh');
+        refreshItem.connect('activate', () => this._refresh());
+        this.menu.addMenuItem(refreshItem);
+
+        // ── initial state + polling ──
+        this._active = false;
+        this._refresh();
+        this._timerId = GLib.timeout_add_seconds(
+            GLib.PRIORITY_DEFAULT,
+            POLL_INTERVAL_SECS,
+            () => { this._refresh(); return GLib.SOURCE_CONTINUE; },
+        );
+    }
+
+    // ── private ──────────────────────────────────────────────────────────────
+
+    _refresh() {
+        this._active = isServiceActive();
+        const iface  = getIfaceInfo();
+        this._updateUI(iface);
+    }
+
+    _updateUI(iface) {
+        if (this._active) {
+            this._icon.icon_name = 'network-vpn-symbolic';
+            this._label.text     = 'VPN';
+            this._label.style    = 'margin-left: 4px; margin-right: 2px; color: #57e389;'; // green
+            this._statusItem.label.text = `Status: Connected`;
+            this._ipv4Item.label.text   = iface.ipv4 ? `IPv4: ${iface.ipv4}` : 'IPv4: —';
+            this._ipv6Item.label.text   = iface.ipv6 ? `IPv6: ${iface.ipv6}` : 'IPv6: —';
+            this._ipv4Item.visible      = true;
+            this._ipv6Item.visible      = true;
+            this._toggleItem.label.text = 'Disconnect';
+        } else {
+            this._icon.icon_name = 'network-vpn-disabled-symbolic';
+            this._label.text     = 'VPN';
+            this._label.style    = 'margin-left: 4px; margin-right: 2px; color: #c01c28;'; // red
+            this._statusItem.label.text = `Status: Disconnected`;
+            this._ipv4Item.visible      = false;
+            this._ipv6Item.visible      = false;
+            this._toggleItem.label.text = 'Connect';
+        }
+    }
+
+    _onToggle() {
+        setServiceActive(!this._active);
+        // Optimistic update while systemd races
+        this._active = !this._active;
+        this._updateUI(getIfaceInfo());
+        // Re-poll shortly after to confirm real state
+        GLib.timeout_add_seconds(GLib.PRIORITY_DEFAULT, 2, () => {
+            this._refresh();
+            return GLib.SOURCE_REMOVE;
+        });
+    }
+
+    // ── cleanup ───────────────────────────────────────────────────────────────
+
+    destroy() {
+        if (this._timerId) {
+            GLib.source_remove(this._timerId);
+            this._timerId = null;
+        }
+        super.destroy();
+    }
+});
+
+// ── extension lifecycle ───────────────────────────────────────────────────────
+
+export default class NebulaVpnExtension extends Extension {
+    enable() {
+        this._indicator = new NebulaIndicator(this.path);
+        Main.panel.addToStatusArea(this.uuid, this._indicator);
+    }
+
+    disable() {
+        this._indicator?.destroy();
+        this._indicator = null;
+    }
+}

packages/system/gnome-nebula-vpn/extension/metadata.json

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+{
+  "name": "Nebula VPN Status",
+  "description": "Shows the status of the Nebula VPN in the GNOME panel with interface info and a toggle.",
+  "uuid": "nebula-vpn-status@mjallen",
+  "shell-version": ["45", "46", "47", "48"],
+  "version": 1
+}