$ git clone -n https://src.fedoraproject.org/rpms/matrix-synapse.git /var/lib/mock/f39-build-2344259-59905/root/chroot_tmpdir/scmroot/matrix-synapse
Cloning into '/var/lib/mock/f39-build-2344259-59905/root/chroot_tmpdir/scmroot/matrix-synapse'...
$ git fetch origin fe74762cfec245f9fed60a649f9bc98195eaf19b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/matrix-synapse
 * [new ref]         fe74762cfec245f9fed60a649f9bc98195eaf19b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fe74762 Update to v1.99.0