$ git clone -n https://src.fedoraproject.org/rpms/wsjtx.git /var/lib/mock/f41-build-829372-156084/root/chroot_tmpdir/scmroot/wsjtx
Cloning into '/var/lib/mock/f41-build-829372-156084/root/chroot_tmpdir/scmroot/wsjtx'...
$ git fetch origin 837073e3d7149867ee56b005434ca633d78dca4c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/wsjtx
 * [new ref]         837073e3d7149867ee56b005434ca633d78dca4c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 837073e Update to 2.7.0 RC6.