Re: [atomic-devel] Documenting "rpm-ostree override"

[Chris Negus <cnegus redhat com>]

Thanks. I added a write-up of "rpm-ostree override" to the Atomic Install and Config guide (currently in QA). I'd be glad for any comments:

  https://access.qa.redhat.com/documentation/en-us/red_hat_enterprise_linux_atomic_host/7/html-single/installation_and_configuration_guide/#overriding_an_existing_rpm_package

-- Chris Negus

----- Original Message -----
> On Tue, May 15, 2018 at 3:51 PM, Chris Negus <cnegus redhat com> wrote:
> > In the wake of James Mills' excellent article on replacing docker in Atomic
> > (https://access.redhat.com/solutions/3414221), I realized we had missed
> > documenting "rpm-ostree override" in the RHEL Atomic user docs. I'll point
> > to that article, but I want to add some new content as well.
> >
> > As I've played around with rpm-ostree override, a few questions have come
> > up:
> >
> > * Can someone suggest a good package to use to override an Atomic package
> > in the base system? Each package I try fails with some dependency issues I
> > don't know how to get around.
> 
> Hmm, interesting -- can you share an example? Remember you'll want to
> pass it all the related packages.
> Any leaf package is easy for demo purposes. E.g. strace is probably a good
> one.
> Though a more realistic example is probably more convincing. If you
> don't want to copy the docker one, maybe openssh?
> I just tried this here:
> 
> ```
> rpm-ostree override replace openssh-7.4p1-15.el7.x86_64.rpm
> openssh-clients-7.4p1-15.el7.x86_64.rpm
> openssh-server-7.4p1-15.el7.x86_64.rpm
> ```
> 
> We've also done some work upstream recently to fully support systemd
> and kernel replacements.
> https://github.com/projectatomic/rpm-ostree/releases/tag/v2018.5
> 
> > * Must a base system package always be removed before it is replaced?
> 
> Nope, the `override replace` operation will take care of that.
> 
> > * Is there a proper way to back out, if you decide you want to go back to
> > the original packages?
> 
> For specific packages: `override reset $pkg1 $pkg2 ...`
> To clear *all* overrides: `override reset --all`
>