$ git clone -n https://src.fedoraproject.org/rpms/buildstream-plugins.git /var/lib/mock/f42-build-side-1-3588355-46945/root/chroot_tmpdir/scmroot/buildstream-plugins
Cloning into '/var/lib/mock/f42-build-side-1-3588355-46945/root/chroot_tmpdir/scmroot/buildstream-plugins'...
$ git fetch origin 0cf5f93ec578289b978be6dc5de9bb6442e8bdbc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/buildstream-plugins
 * [new ref]         0cf5f93ec578289b978be6dc5de9bb6442e8bdbc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0cf5f93 buildstream-plugins.spec: make it depend on buildstream