sbuild --chroot-mode=unshare -d $suite{,-security,-proposed} magic for Ubuntu

[Alessandro Astone]

This seems cool;

But is there a way to make the build happen in RAM, like you could with 
schroot as explained in https://wiki.ubuntu.com/SimpleSbuild ("Creating 
the schroots", step 10)?

On 11/12/2024 14:18, Julian Andres Klode wrote:
> Hey folks,
>
> (just in proposed but don't want to forget to announce it :D)
>
> sbuild recently gained the magic to automatically bootstrap
> tarballs for the unshare backend using mmdebstrap. No more
> schroots to manage, everything is magical!
>
> I have just uploaded a new sbuild that makes this feature
> work correctly for Ubuntu. If you set
>
>      $chroot_mode = "unshare";
>      $unshare_mmdebstrap_keep_tarball = 1;
>
> (the second one is optionally and makes sbuild cache the tarballs
>   in ~/.cache/sbuild; refreshing them after 7 days)
>
> in your sbuild configuration (or pass them on the command-line), then
>
> * `sbuild -d noble` will build the package for noble, with updates
>     enabled
> * `sbuild -d noble-proposed` builds with proposed enabled too
> * `sbuild -d noble-security` builds for the security pocket
> * `sbuild -d noble-backports` builds with backports enabled too (but
>    I think it's still pinned down, I assume you want to use a different
>    solver here to not pull in all backported packages?)
>
> We enable the `main` and `universe` components by default. Should
> we perhaps enable `restricted` and `multiverse` too? There's no
> easy way otherwise to override.
>
> I could not get the tests passing locally so far, but I saw no
> regression and the changes seem unlikely to cause any, so I uploaded
> in the hopes they infrastructure fairs better.
>
> I've now managed to run them and there is failure related to
> cross-bootstrap (yes sbuild --arch=armhf -d plucky also works);
> I'll dig deeper and hopefully fix that too.
>
> You'll need to install mmdebstrap for this. Once it has landed
> I'll try to make the case for the mmdebstrap MIR again.