$ git clone -n https://src.fedoraproject.org/rpms/poke.git /var/lib/mock/f40-build-1474638-23785/root/chroot_tmpdir/scmroot/poke
Cloning into '/var/lib/mock/f40-build-1474638-23785/root/chroot_tmpdir/scmroot/poke'...
$ git fetch origin 45c5507c4d99798fff36612496d06b05b1244dd0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/poke
 * [new ref]         45c5507c4d99798fff36612496d06b05b1244dd0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 45c5507 New upstream release 4.2