$ git clone -n https://src.fedoraproject.org/rpms/vala.git /var/lib/mock/f40-build-2138681-50841/root/chroot_tmpdir/scmroot/vala
Cloning into '/var/lib/mock/f40-build-2138681-50841/root/chroot_tmpdir/scmroot/vala'...
$ git fetch origin 6d2befbbef7eda8cb3a56c6494706274763f09ef:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vala
 * [new ref]         6d2befbbef7eda8cb3a56c6494706274763f09ef -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6d2befb Update to 0.56.14