$ git clone -n https://src.fedoraproject.org/rpms/flatpak.git /var/lib/mock/f42-build-side-1-3533498-46362/root/chroot_tmpdir/scmroot/flatpak
Cloning into '/var/lib/mock/f42-build-side-1-3533498-46362/root/chroot_tmpdir/scmroot/flatpak'...
$ git fetch origin 2be1e9ef880d9f06fec2d0b4dcea9dbda02e218e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/flatpak
 * [new ref]         2be1e9ef880d9f06fec2d0b4dcea9dbda02e218e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2be1e9e Update to 1.16.1 (#2365496)