$ git clone -n https://src.fedoraproject.org/rpms/wsjtx.git /var/lib/mock/f39-build-1921861-42957/root/chroot_tmpdir/scmroot/wsjtx
Cloning into '/var/lib/mock/f39-build-1921861-42957/root/chroot_tmpdir/scmroot/wsjtx'...
$ git fetch origin ff1d82283bcd1fbb859c7053cb40f2f8de04e806:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/wsjtx
 * [new ref]         ff1d82283bcd1fbb859c7053cb40f2f8de04e806 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ff1d822 Include changes needed for 2.7.0.