$ git clone -n https://src.fedoraproject.org/rpms/open-sendmail.git /var/lib/mock/f45-build-20946-576/root/chroot_tmpdir/scmroot/open-sendmail
Cloning into '/var/lib/mock/f45-build-20946-576/root/chroot_tmpdir/scmroot/open-sendmail'...
$ git fetch origin 16098f13b7d90c39c8868f16d962ef1cb5283164:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/open-sendmail
 * [new ref]         16098f13b7d90c39c8868f16d962ef1cb5283164 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 16098f1 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild