readFileSync of undefined when building Meteor docker image on Jenkins

[sishengz]

Meteor version we're using: 1.4.1.3
Docker Version: 1.6.0
Jenkins Version: 2.19.3
Open Shift Version 3.2

When building our docker image on Jenkins, most of our builds we get the following error.

[91minfo�[0m�[91m �[0m�[91merror reading version TypeError: Cannot read property 'readFileSync' of undefined
�[0m�[91minfo error reading version at /root/.meteor/packages/meteor-tool/.1.4.1_3.8dq62w++os.linux.x86_64+web.browser+web.cordova/mt-os.linux.x86_64/dev_bundle/lib/node_modules/cordova-lib/node_modules/npm/lib/npm.js:42:24
�[0m�[91minfo error reading version�[0m�[91m at Object. (/root/.meteor/packages/meteor-tool/.1.4.1_3.8dq62w++os.linux.x86_64+web.browser+web.cordova/mt-os.linux.x86_64/dev_bundle/lib/node_modules/cordova-lib/node_modules/npm/lib/npm.js:475:3)

However building our docker image directly on Open Shift works.