$ git clone -n https://src.fedoraproject.org/rpms/freedv.git /var/lib/mock/f39-build-1667292-40809/root/chroot_tmpdir/scmroot/freedv
Cloning into '/var/lib/mock/f39-build-1667292-40809/root/chroot_tmpdir/scmroot/freedv'...
$ git fetch origin 13f579e007163ee9109ab3b468c70924c4b2e8a8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/freedv
 * [new ref]         13f579e007163ee9109ab3b468c70924c4b2e8a8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 13f579e Rebuild for codec2.