$ git clone -n https://src.fedoraproject.org/rpms/sendemail.git /var/lib/mock/f45-build-35783-699/root/chroot_tmpdir/scmroot/sendemail
Cloning into '/var/lib/mock/f45-build-35783-699/root/chroot_tmpdir/scmroot/sendemail'...
$ git fetch origin 59bf6472c920f80ccea8b0e4999063f8b17ff44c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sendemail
 * [new ref]         59bf6472c920f80ccea8b0e4999063f8b17ff44c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 59bf647 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild