schroot: 20copyfiles: cp: cannot create regular file '.../etc/resolv.conf'

[Daniel Shahaf <danielsh@apache.org>]

Hello,

I usually build packages in a sid chroot using sbuild, but that stopped
working at some point:

% sudo schroot -c source:unstable-amd64-sbuild -d /root 
E: 20copyfiles: cp: cannot create regular file '/var/run/schroot/mount/unstable-amd64-sbuild-0d2f358b-da5e-41fa-8221-d416e21f9d2e/etc/resolv.conf': No such file or directory
E: unstable-amd64-sbuild-19f85771-f85c-4a5d-89da-3c6644ff7005: Chroot setup failed: stage=setup-start
zsh: exit 1

The 'cp' fails because
/var/run/schroot/mount/unstable-amd64-sbuild-0d2f358b-da5e-41fa-8221-d416e21f9d2e/
exists but does not have an "etc/" subdirectory.

It works fine with a jessie schroot on the same host.

The host runs jessie.  schroot version is 1.6.10-2~bpo8+1.

What might be the problem?

Thanks,

Daniel