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design/package-layering: New file

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I keep explaining the vision verbally, let's write it down.
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Colin Walters 2014-06-18 08:48:03 -04:00
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rpm-ostree should support layering packages on top of a base tree. Use cases:
* As a system administrator, I need to use a
profiling/debugging/tracing tool like perf, strace, nmap
* As a system administrator, I prefer Emacs over vi/nano
The design here is this:
$ rpm-ostree add emacs
This will
* Resolve dependencies between the requested emacs package and what we have installed
* Download all packages
* Check out via hardlinks a *new* copy of the base tree
* Unpack and install all requested layered RPMs on top. This requires
that the %post scripts are whitelisted
http://lists.rpm.org/pipermail/rpm-maint/2014-April/003682.html
* Commit that tree as a local branch
* Deploy that branch for the *next* boot
In this model, you will then have to reboot to install Emacs. A
future step for rpm-ostree will be applying partial live updates:
http://blog.verbum.org/2014/02/26/ostree-rigorous-and-reliable-deployment/