$ git clone -n https://src.fedoraproject.org/rpms/flatpak-builder.git /var/lib/mock/f40-build-801661-143843/root/chroot_tmpdir/scmroot/flatpak-builder
Cloning into '/var/lib/mock/f40-build-801661-143843/root/chroot_tmpdir/scmroot/flatpak-builder'...
$ git fetch origin a18936fc93e71bc9b3213cb65c2b17a92be1483b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/flatpak-builder
 * [new ref]         a18936fc93e71bc9b3213cb65c2b17a92be1483b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a18936f Update to 1.4.1