$ git clone -n https://src.fedoraproject.org/rpms/vala.git /var/lib/mock/f39-build-1649144-40458/root/chroot_tmpdir/scmroot/vala
Cloning into '/var/lib/mock/f39-build-1649144-40458/root/chroot_tmpdir/scmroot/vala'...
$ git fetch origin 716d3d353a705ff5985b3da91c4e2b67a46f17b4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vala
 * [new ref]         716d3d353a705ff5985b3da91c4e2b67a46f17b4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 716d3d3 Update to 0.56.13