$ git clone -n https://src.fedoraproject.org/rpms/tart.git /var/lib/mock/f41-build-side-1-2949542-35473/root/chroot_tmpdir/scmroot/tart
Cloning into '/var/lib/mock/f41-build-side-1-2949542-35473/root/chroot_tmpdir/scmroot/tart'...
$ git fetch origin 384e3c162b3c99f5df3847b2fe424197fb2605cc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tart
 * [new ref]         384e3c162b3c99f5df3847b2fe424197fb2605cc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 384e3c1 revise .cabal file