$ git clone -n https://src.fedoraproject.org/rpms/python-debrepo.git /var/lib/mock/f45-build-30269-643/root/chroot_tmpdir/scmroot/python-debrepo
Cloning into '/var/lib/mock/f45-build-30269-643/root/chroot_tmpdir/scmroot/python-debrepo'...
$ git fetch origin 47d5f070f4faf10d0d0a8d2c5c65d2233abfe46e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-debrepo
 * [new ref]         47d5f070f4faf10d0d0a8d2c5c65d2233abfe46e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 47d5f07 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild