add unless-stopped restart policy, systemd user unit, readme

README.md

@@ -46,6 +46,22 @@ Placeholders in `command` / `stop_command`: `{name}`, `{workdir}`, `{pid}`, `{lo
 
 See `config.example.toml` for a full example.
 
+## systemd (user mode)
+
+```sh
+mkdir -p ~/.config/systemd/user
+cp contrib/rss.service ~/.config/systemd/user/
+systemctl --user daemon-reload
+systemctl --user enable rss
+systemctl --user start rss
+```
+
+Requires `linger` for headless users:
+
+```sh
+sudo loginctl enable-linger $USER
+```
+
 ## Install
 
 ```sh

contrib/rss.service

@@ -0,0 +1,13 @@
+[Unit]
+Description=RuSt Supervisor
+After=network.target
+
+[Service]
+Type=simple
+ExecStart=%h/.cargo/bin/rss daemon
+Restart=on-failure
+RestartSec=5
+Environment=RSS_CONFIG=%h/.config/rss/config.toml
+
+[Install]
+WantedBy=default.target

src/config.rs

@@ -55,6 +55,8 @@ fn default_stop_signal() -> String {
 pub enum RestartPolicy {
     No,
     Always,
+    #[serde(alias = "unless-stopped")]
+    UnlessStopped,
     OnFailure,
 }
 

src/supervisor.rs

@@ -77,7 +77,7 @@ pub fn run_supervisor(name: &str, cfg: &ServiceConfig) {
 
                 let should_restart = match cfg.restart {
                     RestartPolicy::No => false,
-                    RestartPolicy::Always => true,
+                    RestartPolicy::Always | RestartPolicy::UnlessStopped => true,
                     RestartPolicy::OnFailure => !status.success(),
                 };