$ git clone -n https://src.fedoraproject.org/rpms/rpmconf.git /var/lib/mock/f40-build-2143216-50854/root/chroot_tmpdir/scmroot/rpmconf
Cloning into '/var/lib/mock/f40-build-2143216-50854/root/chroot_tmpdir/scmroot/rpmconf'...
$ git fetch origin a8aca86f53f0b268b2bf3422554bf971ed18693a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rpmconf
 * [new ref]         a8aca86f53f0b268b2bf3422554bf971ed18693a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a8aca86 setup packit pull-from-upstream automation