$ git clone -n https://src.fedoraproject.org/rpms/spamassassin-iXhash2.git /var/lib/mock/f40-build-2645598-66572/root/chroot_tmpdir/scmroot/spamassassin-iXhash2
Cloning into '/var/lib/mock/f40-build-2645598-66572/root/chroot_tmpdir/scmroot/spamassassin-iXhash2'...
$ git fetch origin a9cc733d49211c4a6372c1777de0c0526f4bda84:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/spamassassin-iXhash2
 * [new ref]         a9cc733d49211c4a6372c1777de0c0526f4bda84 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a9cc733 Upgrade to 4.00 (#2222974)