$ git clone -n https://src.fedoraproject.org/rpms/whois.git /var/lib/mock/f39-build-1530747-36198/root/chroot_tmpdir/scmroot/whois
Cloning into '/var/lib/mock/f39-build-1530747-36198/root/chroot_tmpdir/scmroot/whois'...
$ git fetch origin a9c26954ce51aaa87b5b1b2d42ba4e8800ad8232:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/whois
 * [new ref]         a9c26954ce51aaa87b5b1b2d42ba4e8800ad8232 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a9c2695 Update to 5.5.18 (#2224795)