Bug#955307: debrebuild: should avoid downgrades

[Holger Levsen]

Package: devscripts
Version: 2.20.2
Severity: normal

Dear Maintainer,

this bug report is a bit premature, as currently debrebuild does not setup
the chroot debrebuild (or rather the sbuild command generated by debrebuild),
but anyway, let's file a bug to track this problem and improve upon:

I just tried to rebuild bash 5.0.6 for amd64, which was built on February 25th
2020, using a sid schroot created today. This resulted in many downgrades by
sbuild (as invoked by debrebuild) which in this case (by luck) worked nicely,
but downgrading packages is neither supported by design nor testing, thus
should be avoided.

Thus it would be fantastic if debrebuild would start with a buster schroot
and upgrade that to the packages needed to build bash 5.0.6 for amd64. (With
the logic being: this is a rebuild for a package from unstable built in 
February 2020, thus the build base should be the stable release at that time.)

Currently this is nothing debrebuild can do, but for a future standalone
rebuilder tool this will be a very nice feature.

-- 
cheers,
	Holger

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               holger@(debian|reproducible-builds|layer-acht).org
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