$ git clone -n https://src.fedoraproject.org/rpms/fedmod.git /var/lib/mock/f38-build-side-42-init-devel-1392677-30946/root/chroot_tmpdir/scmroot/fedmod
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1392677-30946/root/chroot_tmpdir/scmroot/fedmod'...
$ git fetch origin ab817d737e16fdd838cf8f145bffe7a83404dfd5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fedmod
 * [new ref]         ab817d737e16fdd838cf8f145bffe7a83404dfd5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ab817d7 Update to 0.6.6