$ git clone -n https://src.fedoraproject.org/rpms/zstr.git /var/lib/mock/f45-build-39423-735/root/chroot_tmpdir/scmroot/zstr
Cloning into '/var/lib/mock/f45-build-39423-735/root/chroot_tmpdir/scmroot/zstr'...
$ git fetch origin 398e6832518c2837a9b173714f515d295eca80d0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/zstr
 * [new ref]         398e6832518c2837a9b173714f515d295eca80d0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 398e683 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild