$ git clone -n https://src.fedoraproject.org/rpms/zfstream.git /var/lib/mock/f45-build-39339-733/root/chroot_tmpdir/scmroot/zfstream
Cloning into '/var/lib/mock/f45-build-39339-733/root/chroot_tmpdir/scmroot/zfstream'...
$ git fetch origin 4ce8c90409d037d305d377a2d6525c0b2a00c5f5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/zfstream
 * [new ref]         4ce8c90409d037d305d377a2d6525c0b2a00c5f5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4ce8c90 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild