Re: Three steps we could take to make supply chain attacks a bit harder

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On Sun, Mar 31, 2024 at 11:20:17PM -0700, Adam Williamson wrote:
> On Sun, 2024-03-31 at 22:13 -0700, Carlos Rodriguez-Fernandez wrote:
> > Adam,
> > 
> > Is there a way already to achieve test isolation during the rpm build?
> 
> Nothing systematic that I'm aware of, no. It would be tricky because
> there is no one universal Standard Test System (not even within a
> single language ecosystem, let alone across all of them). Currently
> you'd have to design something unique, if you wanted to implement this
> for your package.

If we wanted to pursue that, I'd suggest the following:
remount $RPM_BUILD_ROOT read-only for the %check phase
(or maybe overmount it with a writable overlayfs that is thrown
away after %check finishes, and warn if any modifications were made.)
%check is executed after %install, so everything should be in place
before %check, and %check may be skipped, so no modifications to
installed files should be done in %check.

Considering possible implemention details, machinectl has 'bind' and
'bind --read-only' that might be useful here. But mock uses
systemd-nspawn in a way that does register the container with machined.
So maybe it'd be more reasonable to just execute a mount command directly
from mock.

This is independent of the test system and does not require splitting
of the test sources.

Zbyszek
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