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d/t/unshare-qemuwrapper: copy APT preferences into the VM's chroot

Benjamin Drung requested to merge bdrung/sbuild:apt-preferences into main

The autopkgtest d/t/unshare uses sbuild, which fails on Ubuntu lunar (sbuild 0.83.1ubuntu1) as the chroot setup cannot find adduser (not in the chroot as it's now an alternative dependency in apt).

This is fixed in lunar-proposed (sbuild 0.84.1ubuntu2; commit 0d35fa01) since it no longer depends on adduser in the chroot.

However, d/t/unshare-qemuwrapper runs d/t/unshare in a QEMU VM, but its image still does not ship sbuild from lunar-proposed, thus unshare fails anyway (and its parent unshare-qemuwrapper).

The reason is, even though the apt sources are used to build the vm disk image thus lunar-proposed is available, it is not used because apt preferences (autopkgtest --apt-pocket=proposed=src:...) are not copied in.

This is now required as lunar has -proposed pocket w/ NotAutomatic.

So copy all APT preferences into the VM's chroot.

This change is only missing change to get Ubuntu back in sync again.

Bug-Ubuntu: https://launchpad.net/bugs/2000015

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