$ git clone -n https://src.fedoraproject.org/rpms/wsjtx.git /var/lib/mock/f41-build-side-1-2771629-32239/root/chroot_tmpdir/scmroot/wsjtx
Cloning into '/var/lib/mock/f41-build-side-1-2771629-32239/root/chroot_tmpdir/scmroot/wsjtx'...
$ git fetch origin 8a6c20d03ba9d51ddbd320ac3163f09ecf51e93a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/wsjtx
 * [new ref]         8a6c20d03ba9d51ddbd320ac3163f09ecf51e93a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8a6c20d Remove superfox binaries and patch build system.