$ git clone -n https://src.fedoraproject.org/rpms/firmitas.git /var/lib/mock/f45-build-8990-397/root/chroot_tmpdir/scmroot/firmitas
Cloning into '/var/lib/mock/f45-build-8990-397/root/chroot_tmpdir/scmroot/firmitas'...
$ git fetch origin a098a743ec882e7771c650f7a274b51cec29ea8a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/firmitas
 * [new ref]         a098a743ec882e7771c650f7a274b51cec29ea8a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a098a74 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild