$ git clone -n https://src.fedoraproject.org/rpms/classified-ads.git /var/lib/mock/f45-build-3979-329/root/chroot_tmpdir/scmroot/classified-ads
Cloning into '/var/lib/mock/f45-build-3979-329/root/chroot_tmpdir/scmroot/classified-ads'...
$ git fetch origin b321192d2cbe16c05d847d146e0cffee2d33c60d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/classified-ads
 * [new ref]         b321192d2cbe16c05d847d146e0cffee2d33c60d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b321192 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild