$ git clone -n https://src.fedoraproject.org/rpms/libXfixes.git /var/lib/mock/f40-build-2228201-53073/root/chroot_tmpdir/scmroot/libXfixes
Cloning into '/var/lib/mock/f40-build-2228201-53073/root/chroot_tmpdir/scmroot/libXfixes'...
$ git fetch origin 964236e424cc38ca6b00934c4dea67359cedb324:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libXfixes
 * [new ref]         964236e424cc38ca6b00934c4dea67359cedb324 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 964236e libXfixes 6.0.1