$ git clone -n https://src.fedoraproject.org/rpms/flatpak-kcm.git /var/lib/mock/f40-build-763293-122463/root/chroot_tmpdir/scmroot/flatpak-kcm
Cloning into '/var/lib/mock/f40-build-763293-122463/root/chroot_tmpdir/scmroot/flatpak-kcm'...
$ git fetch origin 87af73a0ca76ba2b6cb41a5df1b2d545120c2112:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/flatpak-kcm
 * [new ref]         87af73a0ca76ba2b6cb41a5df1b2d545120c2112 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 87af73a Update to 5.90.0