$ git clone -n https://src.fedoraproject.org/rpms/spamassassin-iXhash2.git /var/lib/mock/f45-build-36271-702/root/chroot_tmpdir/scmroot/spamassassin-iXhash2
Cloning into '/var/lib/mock/f45-build-36271-702/root/chroot_tmpdir/scmroot/spamassassin-iXhash2'...
$ git fetch origin eb083148d5767f58960a17256f5f4972cf03fcc4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/spamassassin-iXhash2
 * [new ref]         eb083148d5767f58960a17256f5f4972cf03fcc4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at eb08314 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild