Bug#775076: adt-setup-vm: sets force-unsafe-io for host dpkg, not guest

[debian@kvr.at (Christian Kastner)]

Source: autopkgtest
Version: 3.9
Severity: serious
Justification: Unwittingly sets dpkg force-unsafe-io on host
Tags: patch

Hi,

adt-setup-vm creates /etc/dpkg/dpkg.cfg.d/autopkgtest on the host,
instead of in the guest, because the path is missing the $root prefix
pointing to the directory where the guest's root is mounted.

This is very unfortunate, as that file sets force-unsafe-io for dpkg,
so this puts the host at risk to data loss.

Regards,
Christian
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