[buildd-tools-devel] Bug#778571: Bug#778571: [Reproducible-builds] Bug#790868: sbuild: Please allow sbuild to use a deterministic build path to build packages

[Roger Leigh]

On 14/07/2015 19:54, Benjamin Drung wrote:

> Instead /var/lib/sbuild/build/sl-bRYRkz could be mounted
> to /var/lib/schroot/mount/$session/usr/src/debian/sl so
> that /var/lib/sbuild/build/sl-bRYRkz/ is accessible
> as /usr/src/debian/sl inside the chroot. The alternative would be to
> bindmount /build/sl-bRYRkz/ to /usr/src/debian/sl inside the chroot
> (which would be an addition bind mount level).
>
> Problem: The path /var/lib/sbuild/build/sl-bRYRkz/ is not static and I
> don't know whether schroot could be configured to support that dynamic
> mounting.

It certainly can.  But not with schroot-1.6; you need 1.7 for user-options.

This would require in schroot
- dropping the /build bind mount in the sbuild profile's fstab
- adding the appropriate user-modifiable keys to the default chroot 
config (maybe also allow profiles to provide default keys so we can do 
transparent upgrades)
- adding a custom sbuild setup script to use the user-provided values to 
do the bind mount

And in sbuild
- invoking schroot with the appropriate options if using a recent enough 
schroot release

It's mostly done today; user-modifiable keys are one of the new 1.7 
features.  The remaining work is primarily in the integration, the work 
to add the setup script, the user keys and tweaking sbuild is just a few 
minutes work, though tying it all together will take considerably longer.


Regards,
Roger