$ git clone -n https://src.fedoraproject.org/rpms/matrix-synapse.git /var/lib/mock/f40-build-1063483-19507/root/chroot_tmpdir/scmroot/matrix-synapse
Cloning into '/var/lib/mock/f40-build-1063483-19507/root/chroot_tmpdir/scmroot/matrix-synapse'...
$ git fetch origin 4f7acb581a7b06479b5767be2ea08b44165c5408:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/matrix-synapse
 * [new ref]         4f7acb581a7b06479b5767be2ea08b44165c5408 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4f7acb5 Update to v1.109.0