$ git clone -n https://src.fedoraproject.org/rpms/serdisplib.git /var/lib/mock/f45-build-35776-699/root/chroot_tmpdir/scmroot/serdisplib
Cloning into '/var/lib/mock/f45-build-35776-699/root/chroot_tmpdir/scmroot/serdisplib'...
$ git fetch origin e573b9fbce242ab31c0defb57dff504ad002739f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/serdisplib
 * [new ref]         e573b9fbce242ab31c0defb57dff504ad002739f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e573b9f Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild