$ git clone -n https://src.fedoraproject.org/rpms/flatpak.git /var/lib/mock/f45-build-9052-398/root/chroot_tmpdir/scmroot/flatpak
Cloning into '/var/lib/mock/f45-build-9052-398/root/chroot_tmpdir/scmroot/flatpak'...
$ git fetch origin a7096736df420140022c578a38a9faa1045a0763:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/flatpak
 * [new ref]         a7096736df420140022c578a38a9faa1045a0763 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a709673 Update to 1.18.4