$ git clone -n https://src.fedoraproject.org/rpms/kf5-kcontacts.git /var/lib/mock/f45-build-14821-464/root/chroot_tmpdir/scmroot/kf5-kcontacts
Cloning into '/var/lib/mock/f45-build-14821-464/root/chroot_tmpdir/scmroot/kf5-kcontacts'...
$ git fetch origin 8c62f868936fee9826a85a925d9971f77ab78588:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf5-kcontacts
 * [new ref]         8c62f868936fee9826a85a925d9971f77ab78588 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8c62f86 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild