var exec = require('child_process').execFileSync;
var githubhook = require('githubhook');
var github = githubhook({/* options */});

function runCmd( cmd, args ){
  exec( cmd, args || [], { stdio: 'inherit' } );
}

github.listen();

github.on('push:REPO_NAME:refs/heads/BRANCH1', function (event, repo, ref, data) {
  runCmd('git-pull.sh', '/home/user/reponame' );
});