$ git clone -n https://src.fedoraproject.org/rpms/papers.git /var/lib/mock/f42-build-3358065-45030/root/chroot_tmpdir/scmroot/papers
Cloning into '/var/lib/mock/f42-build-3358065-45030/root/chroot_tmpdir/scmroot/papers'...
$ git fetch origin 65d5f71cbb894ac9ec2684cdc33014ee2a3fdf2f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/papers
 * [new ref]         65d5f71cbb894ac9ec2684cdc33014ee2a3fdf2f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 65d5f71 Simplify cargo macro usage and fix ELN build