$ git clone -n https://src.fedoraproject.org/rpms/sfsexp.git /var/lib/mock/f45-build-35842-699/root/chroot_tmpdir/scmroot/sfsexp
Cloning into '/var/lib/mock/f45-build-35842-699/root/chroot_tmpdir/scmroot/sfsexp'...
$ git fetch origin 71e14ed4341a858af0b53daacbed1136d0f74c0f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sfsexp
 * [new ref]         71e14ed4341a858af0b53daacbed1136d0f74c0f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 71e14ed Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild