[ptxdist] Ptxdist lightweight packaging usecase.

[Christian Melki <christian.melki@t2data.com>]

Hi.

I'd like to package (docker) a complete ptxdist build environment for a 
target platform but as light as possible. Since most application 
developers do not care about platform stuff, but still need to build 
images from time to time.

So now I have this question: Can I purge build and still produce results?

If I build a platform and remove src, platform-X/build-target, 
platform-X/build-host the actual storage requirements for a docker 
becomes _far_ less. All state are kept so I'd want the user to be able 
to do clean && compile for his rules. Also I'd like to be able to do a 
complete go && images.

The major caveat seems to be the sources directory. If I whipe the 
sources, ptxdist tries to rebuild stuff, even if there is no file (not 
changed, missing) and all states are completed. Get, prepare, compile, 
install etc.

Is there a proper way ptxdist can accomodate this usecase? I don't find 
it unresonable. There is little point in keeping everything or every 
user producing every bit of the result.
Storage requirements is only like 10% of the original. Far easier to 
keep complete states of releases as fast checkpoints for minor corrections.

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