# Systemd unit for running Echo in production. Copy to /etc/systemd/system/,
# edit the paths and User, then: systemctl daemon-reload && systemctl enable --now echo
#
# Assumes a dedicated system user and a data directory holding config.toml and
# the event log (echo.db.jsonl, written relative to WorkingDirectory):
#   useradd --system --home-dir /opt/echo --shell /usr/sbin/nologin echo
#   install -o echo -g echo target/release/echo /opt/echo/echo
#   install -o echo -g echo config.toml /opt/echo/config.toml

[Unit]
Description=Echo IRC services
After=network-online.target
Wants=network-online.target

[Service]
Type=simple
User=echo
Group=echo
WorkingDirectory=/opt/echo
ExecStart=/opt/echo/echo /opt/echo/config.toml
Restart=on-failure
RestartSec=5s
# Give in-flight work a moment; the store fsyncs every event so a hard stop
# never loses a committed change.
TimeoutStopSec=15s

# Hardening. Echo needs only the network and its own data directory.
NoNewPrivileges=true
ProtectSystem=full
ProtectHome=true
PrivateTmp=true
ProtectKernelTunables=true
ProtectKernelModules=true
ProtectControlGroups=true
RestrictSUIDSGID=true
RestrictRealtime=true
LockPersonality=true
ReadWritePaths=/opt/echo
# If you do NOT run a local sendmail (i.e. [email] uses a network relay like
# msmtp), you can tighten this to ProtectSystem=strict for a read-only root.

[Install]
WantedBy=multi-user.target