$ git clone -n https://src.fedoraproject.org/rpms/kf6-purpose.git /var/lib/mock/f41-build-849771-165005/root/chroot_tmpdir/scmroot/kf6-purpose
Cloning into '/var/lib/mock/f41-build-849771-165005/root/chroot_tmpdir/scmroot/kf6-purpose'...
$ git fetch origin 71f5a87b6f09ac911d48fef8da725b2e0759927c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-purpose
 * [new ref]         71f5a87b6f09ac911d48fef8da725b2e0759927c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 71f5a87 6.6.0