rolling timeout for child processes. Test via `mrt update` on a system with `git 1.7.1` installed. `rm -rf ~/.meteorite/source/meteor` to clear local cache so clone is invoked.

in-sources-git.js

GitSource.prototype._clone = function(fn) {
  var self = this,
      timeout = 5000,
      handle,
      child,
      errOutput = [];

  //console.log('git clone')
  if (!fs.existsSync(this.sourcePath)) {
    child = exec('git clone --progress ' + self.url + ' "' + this.sourcePath + '"', function(err, stdout, stderr) {
      //console.log('exec cb fired')
      if (err) {
        console.error(errOutput.join(''))
        throw "There was a problem cloning repo: " + self.url +
          "\nPlease check https://github.com/oortcloud/meteorite/blob/master/CONTRIBUTING.md#troubleshooting for potential explanations.";
      }
      errOutput = null;
      fn();
    });

    function rescheduleKill () {
      //console.log('rescheduleKill');
      if (handle) {
        clearTimeout(handle)
      }
      handle = setTimeout(function () {
        console.log('killing child process...')
        child.kill('SIGHUP')
      }, timeout)
    }

    rescheduleKill()
    
    child.stdout.on('data', function (data) {
      rescheduleKill()
      //console.log('git clone stdout: ', data.toString());
    });
    child.stderr.on('data', function (data) {
      rescheduleKill()
      //console.log('git clone stderr: ', data.toString());
      errOutput.push(data.toString())
    });

    child.on('close', function (code, signal) {
      clearTimeout(handle);
      if (signal) {
        console.log('child process closed due to receipt of signal '+signal);
      }
    });
    child.on('exit', function (code, signal) {
      clearTimeout(handle);
      if (signal) {
        console.log('child process exited due to receipt of signal '+signal);
        console.error('stopping meteorite due to hung git process')
        console.error(errOutput.join(''))
        process.exit(1)
      }
    });
  } else {
    fn();
  }
};

smart.json

{
  "meteor": {
    "tag":"release/0.6.4.1"
  },
  "packages": {
    "testp1": {
      "git":"https://github.com/meteor/meteor.git"
    },
    "twilio-meteor": {
      "git":"http://github.com/andreioprisan/twilio-meteor.git"
    }
  }
}

test-results.txt

(Notes:  Rolling timeout successfully lets long clone of Meteor repo complete, while hung process for twilio-meteor is killed as hoped.)

[rack-user@sw911-a app]$ mrt update
project fetch
✓ testp1
    branch: https://github.com/meteor/meteor.git#master

✓ twilio-meteor
    branch: http://github.com/andreioprisan/twilio-meteor.git#master
killing child process...
child process exited due to receipt of signal SIGHUP
stopping meteorite due to hung git process
error: RPC failed; result=22, HTTP code = 405

[rack-user@sw911-a app]$