$ git clone -n https://src.fedoraproject.org/rpms/python-canonicaljson.git /var/lib/mock/f45-build-29815-641/root/chroot_tmpdir/scmroot/python-canonicaljson
Cloning into '/var/lib/mock/f45-build-29815-641/root/chroot_tmpdir/scmroot/python-canonicaljson'...
$ git fetch origin d804df41a62f9d4eb718e92f3e4adbf448edb903:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-canonicaljson
 * [new ref]         d804df41a62f9d4eb718e92f3e4adbf448edb903 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d804df4 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild