$ git clone -n https://src.fedoraproject.org/rpms/itinerary.git /var/lib/mock/f39-build-1672165-40869/root/chroot_tmpdir/scmroot/itinerary
Cloning into '/var/lib/mock/f39-build-1672165-40869/root/chroot_tmpdir/scmroot/itinerary'...
$ git fetch origin a89241cb1517d79344b502dc99eadd3275d10bbb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/itinerary
 * [new ref]         a89241cb1517d79344b502dc99eadd3275d10bbb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a89241c Updated readme