$ git clone -n https://src.fedoraproject.org/rpms/python-signedjson.git /var/lib/mock/f45-build-32955-665/root/chroot_tmpdir/scmroot/python-signedjson
Cloning into '/var/lib/mock/f45-build-32955-665/root/chroot_tmpdir/scmroot/python-signedjson'...
$ git fetch origin 772710eaa2834ac412d44760312aa998c435002f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-signedjson
 * [new ref]         772710eaa2834ac412d44760312aa998c435002f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 772710e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild