systemd deployment can install directly

lib/src/commands/deploy/systemd.dart

@@ -14,6 +14,8 @@ class SystemdCommand extends Command {
 
   SystemdCommand() {
     argParser
+      ..addOption('install',
+          abbr: 'i', help: 'A name to install this service as on the system.')
       ..addOption('user',
           abbr: 'u',
           defaultsTo: 'web',
@@ -45,8 +47,34 @@ WantedBy=multi-user.target
     '''
         .trim();
 
-    if (!argResults.wasParsed('out')) {
+    if (!argResults.wasParsed('out') && !argResults.wasParsed('install')) {
       print(systemdText);
+    } else if (argResults.wasParsed('install')) {
+      var systemdPath = argResults.wasParsed('out')
+          ? argResults['out'] as String
+          : p.join('etc', 'systemd', 'system');
+      var serviceFilename = p.join(systemdPath,
+          p.setExtension(argResults['install'] as String, '.service'));
+      var file = new File(serviceFilename);
+      await file.create(recursive: true);
+      await file.writeAsString(systemdText);
+      print(green.wrap(
+          "$checkmark Successfully generated systemd service in '${file.path}'."));
+
+      // sudo systemctl daemon-reload
+      if (await runCommand('sudo', ['systemctl', 'daemon-reload'])) {
+        // sudo service <name> start
+        if (await runCommand('sudo', [
+          'service',
+          p.basenameWithoutExtension(serviceFilename),
+          'start'
+        ])) {
+        } else {
+          print(red.wrap('$ballot Failed to install service system-wide.'));
+        }
+      } else {
+        print(red.wrap('$ballot Failed to install service system-wide.'));
+      }
     } else {
       var file = new File(argResults['out'] as String);
       await file.create(recursive: true);

lib/src/util.dart

@@ -25,3 +25,26 @@ Future savePubspec(Pubspec pubspec) async {
   // TODO: Save pubspec for real?
   //var text = toYamlString(pubspec);
 }
+
+Future<bool> runCommand(String exec, List<String> args) async {
+  var s = '$exec ${args.join(' ')}'.trim();
+  stdout.write(darkGray.wrap('Running `$s`... '));
+
+  try {
+    var p = await Process.start(exec, args);
+    var code = await p.exitCode;
+
+    if (code == 0) {
+      print(green.wrap(checkmark));
+      return true;
+    } else {
+      print(red.wrap(ballot));
+      await stdout.addStream(p.stdout);
+      await stderr.addStream(p.stderr);
+      return false;
+    }
+  } catch (e) {
+    print(red.wrap('$ballot Failed to run process.'));
+    return false;
+  }
+}