$ git clone -n https://src.fedoraproject.org/rpms/matrix-synapse.git /var/lib/mock/f40-build-2646974-66673/root/chroot_tmpdir/scmroot/matrix-synapse
Cloning into '/var/lib/mock/f40-build-2646974-66673/root/chroot_tmpdir/scmroot/matrix-synapse'...
$ git fetch origin dec2205479ab1cbe8fd599da439276e24852dbf8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/matrix-synapse
 * [new ref]         dec2205479ab1cbe8fd599da439276e24852dbf8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dec2205 Update to v1.103.0