$ git clone -n https://src.fedoraproject.org/rpms/flatpak-rpm-macros.git /var/lib/mock/f40-build-2687103-68083/root/chroot_tmpdir/scmroot/flatpak-rpm-macros
Cloning into '/var/lib/mock/f40-build-2687103-68083/root/chroot_tmpdir/scmroot/flatpak-rpm-macros'...
$ git fetch origin 075320b4c1a760763e6142af7e820b4241de0fdc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/flatpak-rpm-macros
 * [new ref]         075320b4c1a760763e6142af7e820b4241de0fdc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 075320b Version bump for F40