Re: Please, minimize your build chroots
Quoting Santiago Vila (2022-12-16 02:15:13)
> I've just filed 21 bugs with subject "Missing build-depends on tzdata"
> in bookworm (as tzdata is not build-essential).
thank you for that!
> I can think of two solutions for this:
>
> A) Either debootstrap, when using buildd profile, installs only
> essential and build-essential packages.
>
> or
>
> B) debootstrap keeps installing all required packages in the buildd profile,
> no matter if they are really build-essential or not, but those who
> are not build-essential should have their priority downgraded to "important"
> by ftpmaster.
>
> This problem was already reported here:
>
> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=837060
Thank you for finding my bug from back then. :)
> and apparently we have not decided yet if we are going to do A or B,
> or maybe some other thing. I don't really care how it's fixed, but I
> believe it's about time that we sync practice with policy, because
> currently we are doing this in a quite suboptimal way.
I think truly fixing this problem is a bit more tricky because most build tools
like the sbuild schroot backend require apt being installed in the chroot. As
of today, the sbuild schroot backend is unable to function with a chroot that
doesn't contain apt. I don't think it's conceptually possible to fix the
schroot backend to work with chroots without apt because schroot (for good
reason) doesn't give you root anywhere but inside the chroot.
To be able to install build dependencies in chroots without apt, the sbuild
unshare backend could be used. Also helmut's mdbp can easily be changed to
build packages in chroots without apt when using its mmdebstrap backend.
But of course changing debootstrap to only install essential, build-essential
and apt (but not prio:required) would already fix a large part of the problem.
> In the meantime: If you want to help QA and have any kind of chroot used
> for any kind of QA (say, ci.debian.org or reproducible-builds, or even
> your personal chroots), please try to minimize the packages there,
> do not merely accept debootstrap default behaviour.
You can use mmdebstrap to create such a chroot:
$ mmdebstrap --variant=apt --include=build-essential unstable chroot.tar
This will also install apt because most build tools need it. The mmdebstrap
package mimics debootstrap behaviour. As soon as debootstrap --variant=buildd
is fixed, I'll let mmdebstrap do the same thing.
Thanks!
cheers, josch
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