$ git clone -n https://src.fedoraproject.org/rpms/flatpak-kcm.git /var/lib/mock/f42-build-862508-170850/root/chroot_tmpdir/scmroot/flatpak-kcm
Cloning into '/var/lib/mock/f42-build-862508-170850/root/chroot_tmpdir/scmroot/flatpak-kcm'...
$ git fetch origin 02bc3c160528ddebd50db7720de500b31329f7ea:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/flatpak-kcm
 * [new ref]         02bc3c160528ddebd50db7720de500b31329f7ea -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 02bc3c1 6.2.4