$ git clone -n https://src.fedoraproject.org/rpms/volk.git /var/lib/mock/f40-build-2271005-54871/root/chroot_tmpdir/scmroot/volk
Cloning into '/var/lib/mock/f40-build-2271005-54871/root/chroot_tmpdir/scmroot/volk'...
$ git fetch origin 7f8cf1d46b53eaac89f7c2ed3d343ba8bf5da9cd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/volk
 * [new ref]         7f8cf1d46b53eaac89f7c2ed3d343ba8bf5da9cd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7f8cf1d New version