pe_agent provision from local cache

[cdenneen]

Is there a way to install from download_file location rather than contacting master? Would be beneficial when offline or off VPN with no connectivity to master and don't want to have to spin up a master in vagrant... makes pe_build useful for installing latest PE version on agent to do local applies with. (beats having to deal with latest boxes on atlas with 4.3.2 on them)

[Sharpie]

This currently isn't supported by the pe_agent provisioner as it just calls through to the pe_repo module on the master. Looking at the top-level class in pe_repo, the staging directory where tarballs are stored is hard-coded to /opt/puppetlabs/server/data/staging and isn't exposed as a parameter. So it's not possible to configure pe_repo for a shared tarball cache.

The other option would be to add some logic to the provisioner to download and copy repo files outside of the provisioner --- but the code paths that handle that for pe_bootstrap aren't set up to handle agent version numbers. So, this is probably blocked on getting #97 done first so that pe_build is aware of PE version/agent version combinations instead of delegating that entirely to the pe_repo module.