$ git clone -n https://src.fedoraproject.org/rpms/sexpp.git /var/lib/mock/f45-build-35833-699/root/chroot_tmpdir/scmroot/sexpp
Cloning into '/var/lib/mock/f45-build-35833-699/root/chroot_tmpdir/scmroot/sexpp'...
$ git fetch origin ad09e536c2c9e1d3a9972b0743cec63e0131d904:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sexpp
 * [new ref]         ad09e536c2c9e1d3a9972b0743cec63e0131d904 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ad09e53 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild