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Re: [atomic-devel] Live container updates without in-container DNF



On Tue, 2015-10-20 at 12:09 +0200, Nick Coghlan wrote:
> On 15 October 2015 at 17:56, Pavel Odvody <podvody redhat com> wrote:
> > Hello,
> > 
> > at [0] is a rationale and description of the process, whereas at
> > [1] is
> > the final code.
> > The example uses hosts DNF but could be easily extrapolated and use
> > DNF
> > via another (spc) container (Atomic use-case).
> > 
> > [0]: https://docs.google.com/document/d/1dsStqcuZTeeu3BgwZwmX2zRsuY
> > JoD9Qt9I3SQA9F7Lc/pub
> > [1]: https://github.com/shaded-enmity/dnf-container-update
> 
> Could this be adapted to do container builds in a way where the build
> container is separate from the container being built? (At the moment,
> s2i still has the two merged, so you end up with build tools and
> artifacts in your runtime container by default)
> 
> Regards,
> Nick.
> 

Creating fully-working container chroot can be done with DNF alone [0]:

dnf -y --releasever=21 --nogpg --installroot=/srv/mycontainer -
-disablerepo='*' --enablerepo=fedora install systemd passwd dnf fedora
-release vim-minimal

But I guess that is still slightly different from what you're asking. 
Shameless plug of docker-hica [1] - one specific use case I had in mind
when building HICA was that I want to use bleeding edge LLVM to test 
how good is the code that is coming out of their optimizer. Here's how
I tackle it:
  * create F22-based image with latest LLVM compiled from SVN checkout
  * CD into directory with the project I want to compile, and execute:
    docker run -v $(pwd):$(pwd) -w $(pwd) /build llvm-builder bash -c
'./configure && make'
   
Of course I don't write that ugly Docker command by hand all the time,
but use label 'io.hica.bind_pwd', then it can be launched:

   docker-hica llvm-builder -- bash -c "./configure && make"

While this may not be the exact answer neither, I think we're getting
close.


[0]: http://www.freedesktop.org/software/systemd/man/systemd-nspawn.html
[1]: https://github.com/shaded-enmity/docker-hica

-- 
Pavel Odvody <podvody redhat com>
Software Engineer - EMEA ENG Developer Experience
5EC1 95C1 8E08 5BD9 9BBF 9241 3AFA 3A66 024F F68D
Red Hat Czech s.r.o., Purky┼łova 99/71, 612 45, Brno


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