$ git clone -n https://src.fedoraproject.org/rpms/flatpak-kcm.git /var/lib/mock/f40-build-2185042-51289/root/chroot_tmpdir/scmroot/flatpak-kcm
Cloning into '/var/lib/mock/f40-build-2185042-51289/root/chroot_tmpdir/scmroot/flatpak-kcm'...
$ git fetch origin 818756ea706d924104e623ff98f0f536ef2738f5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/flatpak-kcm
 * [new ref]         818756ea706d924104e623ff98f0f536ef2738f5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 818756e 5.91.0