$ git clone -n https://src.fedoraproject.org/rpms/buildstream.git /var/lib/mock/f41-build-854338-166847/root/chroot_tmpdir/scmroot/buildstream
Cloning into '/var/lib/mock/f41-build-854338-166847/root/chroot_tmpdir/scmroot/buildstream'...
$ git fetch origin 355170d85c17cb11e67a9b7078b937bd81bdbf52:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/buildstream
 * [new ref]         355170d85c17cb11e67a9b7078b937bd81bdbf52 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 355170d Update to BuilStream 2.3.0