$ git clone -n https://src.fedoraproject.org/rpms/tlp.git /var/lib/mock/f40-build-2233817-53385/root/chroot_tmpdir/scmroot/tlp
Cloning into '/var/lib/mock/f40-build-2233817-53385/root/chroot_tmpdir/scmroot/tlp'...
$ git fetch origin 893a2d4a715a5837b469f91ad1a4529089242e18:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tlp
 * [new ref]         893a2d4a715a5837b469f91ad1a4529089242e18 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 893a2d4 Update to 1.6.0