$ git clone -n https://src.fedoraproject.org/rpms/python-prometheus_client.git /var/lib/mock/f40-build-2223028-52723/root/chroot_tmpdir/scmroot/python-prometheus_client
Cloning into '/var/lib/mock/f40-build-2223028-52723/root/chroot_tmpdir/scmroot/python-prometheus_client'...
$ git fetch origin 08f14a3a8491a6987373aa5af1382990dfae4880:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-prometheus_client
 * [new ref]         08f14a3a8491a6987373aa5af1382990dfae4880 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 08f14a3 Update to v0.19.0