travis-ci/travis-build — comment on commit f04d09fab9f36e66cbc0fefb05f7c7a2933dc626
File:  line 0
By svenfuchs:

it's a protected method:

https://github.com/travis-ci/travis-build/blob/f04d09fab9f36e66cbc0fefb05f7c7a2933dc626/lib/travis/build/shell/session.rb#L105-109