bug#42849: [PATCH 3/3] installer: Run the installation inside a container.

[Mathieu Othacehe]

Hey Ludo,

> So perhaps we can settle on the solution you sent, but let’s see if we
> can move complexity out of sight.  For example, if we can arrange to
> have a ‘fork+exec-command/container’ procedure that can be passed the
> PID of a namespace, such that the ‘start’ method of guix-daemon is just
> a few more lines its current definition, I’ll be happy.
>
> How does that sound?

Sounds fine! I added a "fork+exec-command/container" in (gnu build
shepherd) module, that uses "container-excursion" to enter the
namespaces of the process passed as argument.

I also took your other remarks into account and pushed this
serie. Thanks a lot for diving into this harsh stuff :).

Locally, the installer tests behave fine, but I'll monitor the CI to see
how it goes.

Now, the only installation test failure I'm aware of is
https://issues.guix.gnu.org/41948. The good news, is that I have a Guile
patch that seem to solve it[1].

Thanks,

Mathieu

[1]: https://lists.gnu.org/archive/html/bug-guile/2020-08/msg00023.html