app.portBindings and newManifest.tcpPorts may be null

src/shell.js

@@ -0,0 +1,58 @@
+'use strict';
+
+exports = module.exports = {
+    sudo: sudo,
+    exec: exec
+};
+
+var assert = require('assert'),
+    child_process = require('child_process'),
+    debug = require('debug')('box:shell.js'),
+    once = require('once'),
+    util = require('util');
+
+var SUDO = '/usr/bin/sudo';
+
+function exec(tag, file, args, callback) {
+    assert.strictEqual(typeof tag, 'string');
+    assert.strictEqual(typeof file, 'string');
+    assert(util.isArray(args));
+    assert.strictEqual(typeof callback, 'function');
+
+    callback = once(callback); // exit may or may not be called after an 'error'
+
+    debug(tag + ' execFile: %s %s', file, args.join(' '));
+
+    var cp = child_process.spawn(file, args);
+    cp.stdout.on('data', function (data) {
+        debug(tag + ' (stdout): %s', data.toString('utf8'));
+    });
+
+    cp.stderr.on('data', function (data) {
+        debug(tag + ' (stderr): %s', data.toString('utf8'));
+    });
+
+    cp.on('exit', function (code, signal) {
+        if (code || signal) debug(tag + ' code: %s, signal: %s', code, signal);
+
+        callback(code === 0 ? null : new Error(util.format('Exited with error %s signal %s', code, signal)));
+    });
+
+    cp.on('error', function (error) {
+        debug(tag + ' code: %s, signal: %s', error.code, error.signal);
+        callback(error);
+    });
+
+    return cp;
+}
+
+function sudo(tag, args, callback) {
+    assert.strictEqual(typeof tag, 'string');
+    assert(util.isArray(args));
+    assert.strictEqual(typeof callback, 'function');
+
+    // -S makes sudo read stdin for password
+    var cp = exec(tag, SUDO, [ '-S' ].concat(args), callback);
+    cp.stdin.end();
+}
+