$ git clone -n https://src.fedoraproject.org/rpms/gqrx.git /var/lib/mock/f39-build-2407999-60557/root/chroot_tmpdir/scmroot/gqrx
Cloning into '/var/lib/mock/f39-build-2407999-60557/root/chroot_tmpdir/scmroot/gqrx'...
$ git fetch origin cbb607789fab07d85c5606c5e8d6328c2d3e2fd1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gqrx
 * [new ref]         cbb607789fab07d85c5606c5e8d6328c2d3e2fd1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cbb6077 New version