$ git clone -n https://src.fedoraproject.org/rpms/spamassassin.git /var/lib/mock/f45-build-36268-702/root/chroot_tmpdir/scmroot/spamassassin
Cloning into '/var/lib/mock/f45-build-36268-702/root/chroot_tmpdir/scmroot/spamassassin'...
$ git fetch origin 5acd255b7519d82abe939a17f4c6f34a2a9d6389:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/spamassassin
 * [new ref]         5acd255b7519d82abe939a17f4c6f34a2a9d6389 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5acd255 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild