$ git clone -n https://src.fedoraproject.org/rpms/weston.git /var/lib/mock/f41-build-744385-13343/root/chroot_tmpdir/scmroot/weston
Cloning into '/var/lib/mock/f41-build-744385-13343/root/chroot_tmpdir/scmroot/weston'...
$ git fetch origin 20306919854b31b4e9ec1d4604fbd9623b858844:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/weston
 * [new ref]         20306919854b31b4e9ec1d4604fbd9623b858844 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2030691 Split desktop session into its own subpackage