$ git clone -n https://src.fedoraproject.org/rpms/matrix-synapse.git /var/lib/mock/f41-build-856068-167438/root/chroot_tmpdir/scmroot/matrix-synapse
Cloning into '/var/lib/mock/f41-build-856068-167438/root/chroot_tmpdir/scmroot/matrix-synapse'...
$ git fetch origin 3b126db1f3b70a45b0b2f2b706204371af3e5922:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/matrix-synapse
 * [new ref]         3b126db1f3b70a45b0b2f2b706204371af3e5922 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3b126db Update to v1.115.0