Bringing vars back to command/host env

[paul-hammant]

Describe the idea

The commanding machine might like to retrieve one or more vars from a remote invoked Efs2file script. Like so:

CAPTURE $vm_pub_key
RUN cat /root/.ssh/id_rsa.pub

PUT something_else somewhere_else
RUN something

The above would be for VMs created with initial name/password entry .. and an Efs2file script would upgrade that to PKI in the target machine.

Additional context

Sure, the entire log of an Efs2file invocation could be captured and then grep/sed'd on the host* to extract the same info, but that could result in many smaller Efs2file rather than a reduced number that could casually capture multiple vars as they go.

* what's the canonical name for the controlling machine: host, hub, controller ??

[madflojo]

I have to think about this. I like the idea of doing variables within the Efs2file but need to think through a way to implement it that still keeps things simple.

[paul-hammant]

You know, it'd be OK to capture vars as the script progresses, then return them from guest/target to host/source in one go. Specifically, the last operation the executor does is to return vars as a set.

[madflojo]

Yeah, right now the file is fully parsed then each command executes on its own. I would need to change how it parses and specifically split it for each host. Again I’m with the idea just want to think about how to do it before I implement.

[paul-hammant]

I think that's OK too. Traction before perfection.