matrix-docker-ansible-deploy/roles/matrix-synapse/templates/synapse/systemd/matrix-synapse-worker@.service.j2

#jinja2: lstrip_blocks: "True"
# c.f. https://github.com/matrix-org/synapse/pull/4662
[Unit]
Description=Synapse Matrix Worker
After=matrix-synapse.service
BindsTo=matrix-synapse.service

[Service]
Type=simple

# Intentional delay, so that the homeserver (we likely depend on) can manage to start.
ExecStartPre=/bin/sleep 5

# systemd ftw 🤦‍♂️
# https://github.com/systemd/systemd/issues/14895#issuecomment-594123923
ExecStart=/bin/sh -c "WORKER=%i; WORKER=$${WORKER%%:*}; \
			exec /usr/bin/docker exec \
			--user={{ matrix_user_uid }}:{{ matrix_user_gid }} \
			matrix-synapse \
			python -m synapse.app.$${WORKER} -c /data/homeserver.yaml -c /data/worker.%i.yaml"

ExecStop=/usr/bin/docker exec matrix-synapse pkill -f %i
KillMode=process
Restart=always
RestartSec=10
SyslogIdentifier=matrix-synapse-%i

[Install]
WantedBy=matrix-synapse.service