$ git clone -n https://src.fedoraproject.org/rpms/gqrx.git /var/lib/mock/f41-build-836403-158823/root/chroot_tmpdir/scmroot/gqrx
Cloning into '/var/lib/mock/f41-build-836403-158823/root/chroot_tmpdir/scmroot/gqrx'...
$ git fetch origin 19c657768ec2a1639ceba68d8f81ad6c3168c564:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gqrx
 * [new ref]         19c657768ec2a1639ceba68d8f81ad6c3168c564 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 19c6577 Rebuilt for new gnuradio