// Wrap whole file in a function to avoid polluting the global namespace
(function() {
  jsTestOptions = function () {
    if (TestData) {
      return Object.merge(_jsTestOptions, {
        setParameters: TestData.setParameters,
        setParametersMongos: TestData.setParametersMongos,
        storageEngine: TestData.storageEngine,
        wiredTigerEngineConfigString: TestData.wiredTigerEngineConfigString,
        wiredTigerCollectionConfigString: TestData.wiredTigerCollectionConfigString,
        wiredTigerIndexConfigString: TestData.wiredTigerIndexConfigString,
        noJournal: TestData.noJournal,
        noJournalPrealloc: TestData.noJournalPrealloc,
        auth: TestData.auth,
        keyFile: TestData.keyFile,
        authUser: "__system",
        authPassword: TestData.keyFileData,
        authMechanism: TestData.authMechanism,
        adminUser: TestData.adminUser || "admin",
        adminPassword: TestData.adminPassword || "password",
        useLegacyConfigServers: TestData.useLegacyConfigServers || false,
        useLegacyReplicationProtocol: TestData.useLegacyReplicationProtocol || false,
        enableEncryption: TestData.enableEncryption,
        encryptionKeyFile: TestData.encryptionKeyFile,
        auditDestination: TestData.auditDestination,
        useSSL: TestData.useSSL,
        minPort: TestData.minPort,
        maxPort: TestData.maxPort,
      });
    }
    return _jsTestOptions;
  };

  // Shim to allow compatibility with newer shells.
  if (typeof stopMongod === 'undefined') {
    stopMongod = _stopMongoProgram;
  }
  if (typeof startMongod === 'undefined') {
    startMongod = function() {
      argArray = arguments;
      if (jsTestOptions().useSSL) {
        if (argArray.indexOf('--sslMode') < 0) {
          argArray.push(
              '--sslMode', 'requireSSL',
              '--sslPEMKeyFile', 'jstests/libs/server.pem',
              '--sslCAFile', 'jstests/libs/ca.pem',
              '--sslWeakCertificateValidation');
        }
      }
      _startMongod.apply(null, argArray);
    };
  }

  _parsePath = function() {
    var dbpath = "";
    for (var i = 0; i < arguments.length; ++i) {
      if (arguments[i] === "--dbpath") {
        dbpath = arguments[i + 1];
      }
    }

    if (dbpath === "") {
      throw Error("No dbpath specified");
    }

    return dbpath;
  };

  _parsePort = function() {
    var port = "";
    for (var i = 0; i < arguments.length; ++i) {
      if (arguments[i] === "--port") {
        port = arguments[i + 1];
      }
    }

    if (port === "") {
      throw Error("No port specified");
    }
    return port;
  };

  connectionURLTheSame = function(a, b) {

    if (a === b) {
      return true;
    }

    if (!a || !b) {
      return false;
    }

    if (a.host) {
      return connectionURLTheSame(a.host, b);
    }
    if (b.host) {
      return connectionURLTheSame(a, b.host);
    }

    if (a.name) {
      return connectionURLTheSame(a.name, b);
    }
    if (b.name) {
      return connectionURLTheSame(a, b.name);
    }

    if (a.indexOf("/") < 0 && b.indexOf("/") < 0) {
      a = a.split(":");
      b = b.split(":");

      if (a.length !== b.length) {
        return false;
      }

      if (a.length === 2 && a[1] !== b[1]) {
        return false;
      }

      if (a[0] === "localhost" || a[0] === "127.0.0.1") {
        a[0] = getHostName();
      }
      if (b[0] === "localhost" || b[0] === "127.0.0.1") {
        b[0] = getHostName();
      }

      return a[0] === b[0];
    }
    var a0 = a.split("/")[0];
    var b0 = b.split("/")[0];
    return a0 === b0;
  };

  assert(connectionURLTheSame("foo", "foo"));
  assert(!connectionURLTheSame("foo", "bar"));

  assert(connectionURLTheSame("foo/a,b", "foo/b,a"));
  assert(!connectionURLTheSame("foo/a,b", "bar/a,b"));

  createMongoArgs = function(binaryName, args) {
    var fullArgs = [binaryName];

    if (args.length === 1 && isObject(args[0])) {
      var o = args[0];
      for (var k in o) {
        if (o.hasOwnProperty(k)) {
          if (k === "v" && isNumber(o[k])) {
            var n = o[k];
            if (n > 0) {
              if (n > 10) {
                n = 10;
              }
              var temp = "-";
              while (n-- > 0) {
                temp += "v";
              }
              fullArgs.push(temp);
            }
          } else {
            fullArgs.push("--" + k);
            if (o[k] !== "") {
              fullArgs.push(String(o[k]));
            }
          }
        }
      }
    } else {
      for (var i=0; i<args.length; i++) {
        fullArgs.push(args[i]);
      }
    }

    return fullArgs;
  };


  MongoRunner = function() {};

  MongoRunner.dataDir = "/data/db";
  MongoRunner.dataPath = "/data/db/";
  MongoRunner.usedPortMap = {};

  MongoRunner.VersionSub = function(regex, version) {
    this.regex = regex;
    this.version = version;
  };

  // These patterns allow substituting the binary versions used for each
  // version string to support the dev/stable MongoDB release cycle.
  MongoRunner.binVersionSubs = [
    new MongoRunner.VersionSub(/^latest$/, ""),
    new MongoRunner.VersionSub(/^oldest-supported$/, "1.8"),
    // To-be-updated when 3.0 becomes available
    new MongoRunner.VersionSub(/^last-stable$/, "2.6"),
    // Latest unstable and next stable are effectively the same release
    new MongoRunner.VersionSub(/^2\.7(\..*){0,1}/, ""),
    new MongoRunner.VersionSub(/^2\.8(\..*){0,1}/, ""),
    new MongoRunner.VersionSub(/^3\.0(\..*){0,1}/, ""),
    new MongoRunner.VersionSub(/^3\.1(\..*){0,1}/, ""),
  ];

  MongoRunner.getBinVersionFor = function(version) {

    // If this is a version iterator, iterate the version via toString()
    if (version instanceof MongoRunner.versionIterator.iterator) {
      version = version.toString();
    }

    // No version set means we use no suffix, this is *different* from "latest"
    // since latest may be mapped to a different version.
    version = version || "";
    version = version.trim();
    if (version === "") {
      return "";
    }

    // See if this version is affected by version substitutions
    for (var i = 0; i < MongoRunner.binVersionSubs.length; i++) {
      var sub = MongoRunner.binVersionSubs[i];
      if (sub.regex.test(version)) {
        version = sub.version;
      }
    }

    return version;
  };

  MongoRunner.areBinVersionsTheSame = function(versionA, versionB) {
    versionA = MongoRunner.getBinVersionFor(versionA);
    versionB = MongoRunner.getBinVersionFor(versionB);

    if (versionA === "" || versionB === "") {
      return versionA === versionB;
    }

    return versionA.startsWith(versionB) ||
           versionB.startsWith(versionA);
  };

  MongoRunner.logicalOptions = {
    runId: true,
    pathOpts: true,
    remember: true,
    noRemember: true,
    appendOptions: true,
    restart: true,
    noCleanData: true,
    cleanData: true,
    startClean: true,
    forceLock: true,
    useLogFiles: true,
    logFile: true,
    useHostName: true,
    useHostname: true,
    noReplSet: true,
    forgetPort: true,
    arbiter: true,
    noJournalPrealloc: true,
    noJournal: true,
    binVersion: true,
    waitForConnect: true,
  };

  MongoRunner.toRealPath = function(path, pathOpts) {
    // Replace all $pathOptions with actual values
    pathOpts = pathOpts || {};
    path = path.replace(/\$dataPath/g, MongoRunner.dataPath);
    path = path.replace(/\$dataDir/g, MongoRunner.dataDir);
    for (key in pathOpts) { // eslint-disable-line guard-for-in
      path = path.replace(RegExp("\\$" + RegExp.escape(key), "g"), pathOpts[key]);
    }

    // Relative path
    // Detect Unix and Windows absolute paths
    // as well as Windows drive letters
    // Also captures Windows UNC paths
    if (!path.match(/^(\/|\\|[A-Za-z]:)/)) {
      if (path !== "" && !path.endsWith("/")) {
        path += "/";
      }

      path = MongoRunner.dataPath + path;
    }

    return path;
  };

  MongoRunner.toRealDir = function(path, pathOpts) {
    path = MongoRunner.toRealPath(path, pathOpts);
    if (path.endsWith("/")) {
      path = path.substring(0, path.length - 1);
    }
    return path;
  };

  MongoRunner.toRealFile = MongoRunner.toRealDir;

  MongoRunner.nextOpenPort = function() {
    if (typeof allocatePort === "function") {
      return allocatePort();
    }

    var i = 0;
    while (MongoRunner.usedPortMap[String(27000 + i)]) {
      i++;
    }
    MongoRunner.usedPortMap[String(27000 + i)] = true;

    return 27000 + i;
  };

  /**
   * Returns an iterator object which yields successive versions on toString(), starting from a
   * random initial position, from an array of versions.
   *
   * If passed a single version string or an already-existing version iterator, just returns the
   * object itself, since it will yield correctly on toString()
   *
   * @param {Array.<String>}|{String}|{versionIterator}
   */
  MongoRunner.versionIterator = function(arr, isRandom) {

    // If this isn't an array of versions, or is already an iterator, just use it
    if (typeof arr === "string") {
      return arr;
    }
    if (arr.isVersionIterator) {
      return arr;
    }

    isRandom = isRandom || false;

    // Starting pos
    var i = isRandom ? parseInt(Random.rand() * arr.length) : 0;

    return new MongoRunner.versionIterator.iterator(i, arr);
  };

  MongoRunner.versionIterator.iterator = function(i, arr) {

    this.toString = function() {
      i = (i + 1) % arr.length;
      print("Returning next version : " + i +
               " (" + arr[i] + ") from " + tojson(arr) + "...");
      return arr[i];
    };

    this.isVersionIterator = true;

  };

  /**
   * Converts the args object by pairing all keys with their value and appending
   * dash-dash (--) to the keys. The only exception to this rule are keys that
   * are defined in MongoRunner.logicalOptions, of which they will be ignored.
   *
   * @param {string} binaryName
   * @param {Object} args
   *
   * @return {Array.<String>} an array of parameter strings that can be passed
   *   to the binary.
   */
  MongoRunner.arrOptions = function(binaryName, args) {
    var fullArgs = [""];

    // isObject returns true even if "args" is an array, so the else branch of this statement is
    // dead code.  See SERVER-14220.
    if (isObject(args) || (args.length === 1 && isObject(args[0]))) {
      var o = isObject(args) ? args : args[0];

      // If we've specified a particular binary version, use that
      if (o.binVersion && o.binVersion !== "") {
        binaryName += "-" + o.binVersion;
      }

      // Manage legacy options
      var isValidOptionForBinary = function(option, value) {
        if (!o.binVersion) {
          return true;
        }

        // Version 1.x options
        if (o.binVersion.startsWith("1.")) {
          return ["nopreallocj"].indexOf(option) < 0;
        }

        return true;
      };

      var addOptionsToFullArgs = function(k, v) {
        if (v === undefined || v === null) {
          return;
        }

        fullArgs.push("--" + k);

        if (v !== "") {
          fullArgs.push("" + v);
        }
      };

      for (var k in o) {
        // Make sure our logical option should be added to the array of options
        if (!o.hasOwnProperty(k) ||
            k in MongoRunner.logicalOptions ||
            !isValidOptionForBinary(k, o[k])) {
          continue;
        }

        if ((k === "v" || k === "verbose") && isNumber(o[k])) {
          var n = o[k];
          if (n > 0) {
            if (n > 10) {
              n = 10;
            }
            var temp = "-";
            while (n-- > 0) {
              temp += "v";
            }
            fullArgs.push(temp);
          }
        } else if (k === "setParameter" && isObject(o[k])) {
            // If the value associated with the setParameter option is an object, we want
            // to add all key-value pairs in that object as separate --setParameters.
          for (var l = 0; l < Object.keys(o[k]).length; l++) {
            var paramKey = Object.keys(o[k])[l];
            addOptionsToFullArgs(k, "" + paramKey + "=" + o[k][paramKey]);
          }
        } else {
          addOptionsToFullArgs(k, o[k]);
        }
      }
    } else {
      for (var i=0; i<args.length; i++) {
        fullArgs.push(args[i]);
      }
    }

    fullArgs[0] = binaryName;
    return fullArgs;
  };

  MongoRunner.arrToOpts = function(arr) {
    var opts = {};
    for (var i = 1; i < arr.length; i++) {
      if (arr[i].startsWith("-")) {
        var opt = arr[i].replace(/^-/, "").replace(/^-/, "");
        if (arr.length > i + 1 && !arr[i + 1].startsWith("-")) {
          opts[opt] = arr[i + 1];
          i++;
        } else {
          opts[opt] = "";
        }

        if (opt.replace(/v/g, "") === "") {
          opts["verbose"] = opt.length;
        }
      }
    }

    return opts;
  };

  MongoRunner.savedOptions = {};

  MongoRunner.mongoOptions = function(opts) {
    // Don't remember waitForConnect
    var waitForConnect = opts.waitForConnect;
    delete opts.waitForConnect;

    // If we're a mongo object
    if (opts.getDB) {
      opts = {restart: opts.runId};
    }

    // Initialize and create a copy of the opts
    opts = Object.merge(opts || {}, {});

    opts.restart = opts.restart || false;

    // RunId can come from a number of places
    // If restart is passed as an old connection
    if (opts.restart && opts.restart.getDB) {
      opts.runId = opts.restart.runId;
      opts.restart = true;
    } else if (isObject(opts.restart)) {
      // If it's the runId itself
      opts.runId = opts.restart;
      opts.restart = true;
    }

    if (isObject(opts.remember)) {
      opts.runId = opts.remember;
      opts.remember = true;
    } else if (opts.remember === undefined) {
      // Remember by default if we're restarting
      opts.remember = opts.restart;
    }

    // If we passed in restart : <conn> or runId : <conn>
    if (isObject(opts.runId) && opts.runId.runId) {
      opts.runId = opts.runId.runId;
    }

    if (opts.restart && opts.remember) {
      opts = Object.merge(MongoRunner.savedOptions[opts.runId], opts);
    }

    // Create a new runId
    opts.runId = opts.runId || ObjectId();

    // Save the port if required
    if (!opts.forgetPort) {
      opts.port = opts.port || MongoRunner.nextOpenPort();
    }

    var shouldRemember = (!opts.restart && !opts.noRemember) || (opts.restart && opts.appendOptions);

    // Normalize and get the binary version to use
    opts.binVersion = MongoRunner.getBinVersionFor(opts.binVersion);

    if (shouldRemember) {
      MongoRunner.savedOptions[opts.runId] = Object.merge(opts, {});
    }

    // Default for waitForConnect is true
    opts.waitForConnect = (waitForConnect === undefined || waitForConnect === null) ?
        true : waitForConnect;

    if (jsTestOptions().useSSL) {
      opts.sslMode = opts.sslMode || "requireSSL";
      opts.sslPEMKeyFile = opts.sslPEMKeyFile || "jstests/libs/server.pem";
      opts.sslCAFile = opts.sslCAFile || "jstests/libs/ca.pem";

      // Needed for jstest/ssl/upgrade_to_ssl.js
      opts.sslWeakCertificateValidation = "";

      // Needed for jstest/ssl/ssl_hostname_validation.js
      opts.sslAllowInvalidHostnames = "";
    }

    if (jsTestOptions().useX509 && !opts.clusterAuthMode) {
      opts.clusterAuthMode = "x509";
    }

    opts.port = opts.port || MongoRunner.nextOpenPort();
    MongoRunner.usedPortMap[String(parseInt(opts.port))] = true;

    opts.pathOpts = Object.merge(opts.pathOpts || {}, {
      port: String(opts.port),
      runId: String(opts.runId),
    });

    if (!opts.bind_ip) {
      opts.bind_ip = "0.0.0.0";
    }

    return opts;
  };

  /**
   * @option {object} opts
   *
   *   {
   *     dbpath {string}
   *     useLogFiles {boolean}: use with logFile option.
   *     logFile {string}: path to the log file. If not specified and useLogFiles
   *       is true, automatically creates a log file inside dbpath.
   *     noJournalPrealloc {boolean}
   *     noJournal {boolean}
   *     keyFile
   *     replSet
   *     oplogSize
   *   }
   */
  MongoRunner.mongodOptions = function(opts) {
    opts = MongoRunner.mongoOptions(opts);
    opts.dbpath = MongoRunner.toRealDir(opts.dbpath || "$dataDir/mongod-$port",
                                         opts.pathOpts);
    opts.pathOpts = Object.merge(opts.pathOpts, {dbpath: opts.dbpath});

    if (!opts.logFile && opts.useLogFiles) {
      opts.logFile = opts.dbpath + "/mongod.log";
    } else if (opts.logFile) {
      opts.logFile = MongoRunner.toRealFile(opts.logFile, opts.pathOpts);
    }

    if (opts.logFile !== undefined) {
      opts.logpath = opts.logFile;
    }

    if (jsTestOptions().noJournalPrealloc || opts.noJournalPrealloc) {
      opts.nopreallocj = "";
    }

    if (jsTestOptions().noJournal || opts.noJournal) {
      opts.nojournal = "";
    }

    if (jsTestOptions().keyFile && !opts.keyFile) {
      opts.keyFile = jsTestOptions().keyFile;
    }

    if (jsTestOptions().useSSL) {
      opts.sslMode = opts.sslMode || "requireSSL";
      opts.sslPEMKeyFile = opts.sslPEMKeyFile || "jstests/libs/server.pem";
      opts.sslCAFile = opts.sslCAFile || "jstests/libs/ca.pem";

      // Needed for jstest/ssl/upgrade_to_ssl.js
      opts.sslWeakCertificateValidation = "";

      // Needed for jstest/ssl/ssl_hostname_validation.js
      opts.sslAllowInvalidHostnames = "";
    }

    if (jsTestOptions().useX509 && !opts.clusterAuthMode) {
      opts.clusterAuthMode = "x509";
    }

    if (opts.noReplSet) {
      opts.replSet = null;
    }
    if (opts.arbiter) {
      opts.oplogSize = 1;
    }

    return opts;
  };

  MongoRunner.mongosOptions = function(opts) {
    opts = MongoRunner.mongoOptions(opts);

    // Normalize configdb option to be host string if currently a host
    if (opts.configdb && opts.configdb.getDB) {
      opts.configdb = opts.configdb.host;
    }

    opts.pathOpts = Object.merge(opts.pathOpts, {
      configdb: opts.configdb.replace(/:|,/g, "-")
    });

    if (!opts.logFile && opts.useLogFiles) {
      opts.logFile = MongoRunner.toRealFile("$dataDir/mongos-$configdb-$port.log",
                                               opts.pathOpts);
    } else if (opts.logFile) {
      opts.logFile = MongoRunner.toRealFile(opts.logFile, opts.pathOpts);
    }

    if (opts.logFile !== undefined) {
      opts.logpath = opts.logFile;
    }

    if (jsTestOptions().keyFile && !opts.keyFile) {
      opts.keyFile = jsTestOptions().keyFile;
    }

    return opts;
  };

  /**
   * Starts a mongod instance.
   *
   * @param {Object} opts
   *
   *   {
   *     useHostName {boolean}: Uses hostname of machine if true
   *     forceLock {boolean}: Deletes the lock file if set to true
   *     dbpath {string}: location of db files
   *     cleanData {boolean}: Removes all files in dbpath if true
   *     startClean {boolean}: same as cleanData
   *     noCleanData {boolean}: Do not clean files (cleanData takes priority)
   *
   *     @see MongoRunner.mongodOptions for other options
   *   }
   *
   * @return {Mongo} connection object to the started mongod instance.
   *
   * @see MongoRunner.arrOptions
   */
  MongoRunner.runMongod = function(opts) {
    opts = opts || {};
    var useHostName = false;
    var runId = null;
    var waitForConnect = true;
    var fullOptions = opts;

    if (isObject(opts)) {
      opts = MongoRunner.mongodOptions(opts);
      fullOptions = opts;

      useHostName = opts.useHostName || opts.useHostname;
      runId = opts.runId;
      waitForConnect = opts.waitForConnect;

      if (opts.forceLock) {
        removeFile(opts.dbpath + "/mongod.lock");
      }
      if ((opts.cleanData || opts.startClean) || (!opts.restart && !opts.noCleanData)) {
        print("Resetting db path '" + opts.dbpath + "'");
        resetDbpath(opts.dbpath);
      }

      opts = MongoRunner.arrOptions("mongod", opts);
    }

    var mongod = MongoRunner.startWithArgs(opts, waitForConnect);
    if (!waitForConnect) {
      mongos = {};
    }
    if (!mongod) {
      return null;
    }

    mongod.commandLine = MongoRunner.arrToOpts(opts);
    mongod.name = (useHostName ? getHostName() : "localhost") + ":" + mongod.commandLine.port;
    mongod.host = mongod.name;
    mongod.port = parseInt(mongod.commandLine.port);
    mongod.runId = runId || ObjectId();
    mongod.dbpath = fullOptions.dbpath;
    mongod.savedOptions = MongoRunner.savedOptions[mongod.runId];
    mongod.fullOptions = fullOptions;

    return mongod;
  };

  MongoRunner.runMongos = function(opts) {
    opts = opts || {};
    var useHostName = false;
    var runId = null;
    var waitForConnect = true;
    var fullOptions = opts;

    if (isObject(opts)) {
      opts = MongoRunner.mongosOptions(opts);
      fullOptions = opts;

      useHostName = opts.useHostName || opts.useHostname;
      runId = opts.runId;
      waitForConnect = opts.waitForConnect;

      opts = MongoRunner.arrOptions("mongos", opts);
    }

    var mongos = MongoRunner.startWithArgs(opts, waitForConnect);
    if (!waitForConnect) {
      mongos = {};
    }
    if (!mongos) {
      return null;
    }

    mongos.commandLine = MongoRunner.arrToOpts(opts);
    mongos.name = (useHostName ? getHostName() : "localhost") + ":" + mongos.commandLine.port;
    mongos.host = mongos.name;
    mongos.port = parseInt(mongos.commandLine.port);
    mongos.runId = runId || ObjectId();
    mongos.savedOptions = MongoRunner.savedOptions[mongos.runId];
    mongos.fullOptions = fullOptions;

    return mongos;
  };

  /**
   * Kills a mongod process.
   *
   * @param {number} port the port of the process to kill
   * @param {number} signal The signal number to use for killing
   * @param {Object} opts Additional options. Format:
   *    {
   *      auth: {
   *        user {string}: admin user name
   *        pwd {string}: admin password
   *      }
   *    }
   *
   * Note: The auth option is required in a authenticated mongod running in Windows since
   *  it uses the shutdown command, which requires admin credentials.
   */
  MongoRunner.stopMongod = function(port, signal, opts) {
    if (!port) {
      print("Cannot stop mongo process " + port);
      return;
    }

    signal = signal || 15;

    if (port.port) {
      port = parseInt(port.port);
    }

    if (port instanceof ObjectId) {
      opts = MongoRunner.savedOptions(port);
      if (opts) {
        port = parseInt(opts.port);
      }
    }

    var exitCode = stopMongod(parseInt(port), parseInt(signal), opts);

    delete MongoRunner.usedPortMap[String(parseInt(port))];

    return exitCode;
  };

  MongoRunner.stopMongos = MongoRunner.stopMongod;

  MongoRunner.isStopped = function(port) {
    if (!port) {
      print("Cannot detect if process " + port + " is stopped.");
      return;
    }

    if (port.port) {
      port = parseInt(port.port);
    }

    if (port instanceof ObjectId) {
      opts = MongoRunner.savedOptions(port);
      if (opts) {
        port = parseInt(opts.port);
      }
    }

    return !MongoRunner.usedPortMap[String(parseInt(port))];
  };

  /**
   * Starts an instance of the specified mongo tool
   *
   * @param {String} binaryName The name of the tool to run
   * @param {Object} opts options to pass to the tool
   *    {
   *      binVersion {string}: version of tool to run
   *    }
   *
   * @see MongoRunner.arrOptions
   */
  MongoRunner.runMongoTool = function(binaryName, opts) {
    opts = opts || {};
    // Normalize and get the binary version to use
    opts.binVersion = MongoRunner.getBinVersionFor(opts.binVersion);

    var argsArray = MongoRunner.arrOptions(binaryName, opts);

    return runMongoProgram.apply(null, argsArray);
  };

  // Given a test name figures out a directory for that test to use for dump files and makes sure
  // that directory exists and is empty.
  MongoRunner.getAndPrepareDumpDirectory = function(testName) {
    var dir = MongoRunner.dataPath + testName + "_external/";
    resetDbpath(dir);
    return dir;
  };

  // Start a mongod instance and return a 'Mongo' object connected to it.
  // This function's arguments are passed as command line arguments to mongod.
  // The specified 'dbpath' is cleared if it exists, created if not.
  // var conn = startMongodEmpty("--port", 30000, "--dbpath", "asdf");
  startMongodEmpty = function () {
    var args = createMongoArgs("mongod", arguments);

    var dbpath = _parsePath.apply(null, args);
    resetDbpath(dbpath);

    return startMongoProgram.apply(null, args);
  };
  startMongod = function () {
    print("startMongod WARNING DELETES DATA DIRECTORY THIS IS FOR TESTING ONLY");
    return startMongodEmpty.apply(null, arguments);
  };
  startMongodNoReset = function() {
    var args = createMongoArgs("mongod", arguments);
    return startMongoProgram.apply(null, args);
  };

  startMongos = function(args) {
    return MongoRunner.runMongos(args);
  };

  /**
   * Returns a new argArray with any test-specific arguments added.
   */
  function appendSetParameterArgs(argArray) {
    var programName = argArray[0];
    if (programName.endsWith('mongod') || programName.endsWith('mongos')) {
      if (jsTest.options().enableTestCommands) {
        argArray.push('--setParameter', "enableTestCommands=1");
      }
      if (jsTest.options().authMechanism && jsTest.options().authMechanism !== "SCRAM-SHA-1") {
        var hasAuthMechs = false;
        for (i in argArray) {
          if (typeof argArray[i] === 'string' &&
                    argArray[i].indexOf('authenticationMechanisms') !== -1) {
            hasAuthMechs = true;
            break;
          }
        }
        if (!hasAuthMechs) {
          argArray.push('--setParameter', "authenticationMechanisms=" + jsTest.options().authMechanism);
        }
      }
      if (jsTest.options().auth) {
        argArray.push('--setParameter', "enableLocalhostAuthBypass=false");
      }
      if (jsTestOptions().useSSL) {
        if (argArray.indexOf('--sslMode') < 0) {
          argArray.push(
              '--sslMode', 'requireSSL',
              '--sslPEMKeyFile', 'jstests/libs/server.pem',
              '--sslCAFile', 'jstests/libs/ca.pem',
              '--sslWeakCertificateValidation');
        }
      }

      if (programName.endsWith('mongos')) {
        // mongos only options
        // apply setParameters for mongos
        if (jsTest.options().setParametersMongos) {
          var params = jsTest.options().setParametersMongos.split(",");
          if (params && params.length > 0) {
            params.forEach(function(p) {
              if (p) {
                argArray.push('--setParameter', p);
              }
            });
          }
        }
      } else if (programName.endsWith('mongod')) {
        // mongod only options
        // set storageEngine for mongod
        if (jsTest.options().storageEngine) {
          if (argArray.indexOf("--storageEngine") < 0) {
            argArray.push('--storageEngine', jsTest.options().storageEngine);
          }
        }
        if (jsTest.options().wiredTigerEngineConfigString) {
          argArray.push('--wiredTigerEngineConfigString', jsTest.options().wiredTigerEngineConfigString);
        }
        if (jsTest.options().wiredTigerCollectionConfigString) {
          argArray.push('--wiredTigerCollectionConfigString', jsTest.options().wiredTigerCollectionConfigString);
        }
        if (jsTest.options().wiredTigerIndexConfigString) {
          argArray.push('--wiredTigerIndexConfigString', jsTest.options().wiredTigerIndexConfigString);
        }
        // apply setParameters for mongod
        if (jsTest.options().setParameters) {
          params = jsTest.options().setParameters.split(",");
          if (params && params.length > 0) {
            params.forEach(function(p) {
              if (p) {
                argArray.push('--setParameter', p);
              }
            });
          }
        }
      }
    }
    return argArray;
  }

  /**
   * Start a mongo process with a particular argument array.  If we aren't waiting for connect,
   * return null.
   */
  MongoRunner.startWithArgs = function(argArray, waitForConnect) {
    // TODO: Make there only be one codepath for starting mongo processes
    argArray = appendSetParameterArgs(argArray);
    var port = _parsePort.apply(null, argArray);
    var pid = _startMongoProgram.apply(null, argArray);

    var conn = null;
    if (waitForConnect) {
      assert.soon(function() {
        try {
          conn = new Mongo("127.0.0.1:" + port);
          return true;
        } catch (e) {
          if (!checkProgram(pid)) {
            print("Could not start mongo program at " + port + ", process ended");
            return true;
          }
        }
        return false;
      }, "unable to connect to mongo program on port " + port, 600 * 1000);
    }

    return conn;
  };

  /**
   * DEPRECATED
   *
   * Start mongod or mongos and return a Mongo() object connected to there.
   * This function's first argument is "mongod" or "mongos" program name, \
   * and subsequent arguments to this function are passed as
   * command line arguments to the program.
   */
  startMongoProgram = function() {
    var port = _parsePort.apply(null, arguments);

    // Enable test commands.
    // TODO: Make this work better with multi-version testing so that we can support
    // enabling this on 2.4 when testing 2.6
    var args = Array.from(arguments);
    args = appendSetParameterArgs(args);
    var pid = _startMongoProgram.apply(null, args);

    var m;
    assert.soon(function() {
      try {
        m = new Mongo("127.0.0.1:" + port);
        return true;
      } catch (e) {
        if (!checkProgram(pid)) {

          print("Could not start mongo program at " + port + ", process ended");

                // Break out
          m = null;
          return true;
        }
      }
      return false;
    }, "unable to connect to mongo program on port " + port, 600 * 1000);

    return m;
  };

  runMongoProgram = function() {
    var args = Array.from(arguments);
    var progName = args[0];

    if (jsTestOptions().auth) {
      args = args.slice(1);
      args.unshift(progName,
                      '-u', jsTestOptions().authUser,
                      '-p', jsTestOptions().authPassword,
                      '--authenticationDatabase=admin'
                    );
    }

    if (jsTestOptions().useSSL) {
      args.push("--ssl",
          "--sslPEMKeyFile", "jstests/libs/client.pem",
          "--sslCAFile", "jstests/libs/ca.pem",
          "--sslAllowInvalidHostnames");
    }

    if (progName === 'mongo' && !_useWriteCommandsDefault()) {
      progName = args[0];
      args = args.slice(1);
      args.unshift(progName, '--useLegacyWriteOps');
    }

    return _runMongoProgram.apply(null, args);
  };

  // Start a mongo program instance.  This function's first argument is the
  // program name, and subsequent arguments to this function are passed as
  // command line arguments to the program.  Returns pid of the spawned program.
  startMongoProgramNoConnect = function() {
    var args = Array.from(arguments);
    var progName = args[0];

    if (jsTestOptions().auth) {
      args = args.slice(1);
      args.unshift(progName,
          '-u', jsTestOptions().authUser,
          '-p', jsTestOptions().authPassword,
          '--authenticationDatabase=admin');
    }

    if (jsTestOptions().useSSL) {
      args.push("--ssl",
          "--sslPEMKeyFile", "jstests/libs/client.pem",
          "--sslCAFile", "jstests/libs/ca.pem",
          "--sslAllowInvalidHostnames");
    }

    if (progName === 'mongo' && !_useWriteCommandsDefault()) {
      args = args.slice(1);
      args.unshift(progName, '--useLegacyWriteOps');
    }

    return _startMongoProgram.apply(null, args);
  };

  myPort = function() {
    var m = db.getMongo();
    if (m.host.match(/:/)) {
      return m.host.match(/:(.*)/)[1];
    }
    return 27017;
  };

}());
