$ git clone -n https://src.fedoraproject.org/rpms/vdrift.git /var/lib/mock/f40-build-780873-131366/root/chroot_tmpdir/scmroot/vdrift
Cloning into '/var/lib/mock/f40-build-780873-131366/root/chroot_tmpdir/scmroot/vdrift'...
$ git fetch origin 6c9fe122f4083c9e88cd6e7d0ef35804f35fcce7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vdrift
 * [new ref]         6c9fe122f4083c9e88cd6e7d0ef35804f35fcce7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6c9fe12 Fix FTBFS