default to /tmp/rss/ for shared multi-user access

- runtime_dir() defaults to /tmp/rss (no user-specific fallback)
- socket_path() defaults to /tmp/rss/rss.sock (overridable via RSS_SOCKET)
- enabled markers in runtime_dir, not config_dir (shared state)
- daemon creates /tmp/rss/ with explicit 770 permissions

contrib/rss.service

@@ -7,8 +7,6 @@ Type=simple
 ExecStart=%h/.cargo/bin/rss daemon
 Restart=on-failure
 RestartSec=5
-Environment=RSS_CONFIG=%h/.config/rss/config.toml
-Environment=RSS_STATE_DIR=%h/.local/share/rss
 
 [Install]
 WantedBy=default.target

src/daemon.rs

@@ -47,14 +47,7 @@ pub fn run(config_path: String) {
     }
     if let Some(parent) = sock_path.parent() {
         fs::create_dir_all(parent).ok();
-        // Make directory group-accessible (rwxrwx---)
-        if let Ok(dir) = fs::metadata(parent) {
-            let perm = dir.permissions();
-            let mode = perm.mode();
-            // set group rwx if owner has it
-            let group = (mode & 0o700) >> 3;
-            let _ = fs::set_permissions(parent, fs::Permissions::from_mode(mode | group));
-        }
+        let _ = fs::set_permissions(parent, fs::Permissions::from_mode(0o770));
     }
 
     // Load config

src/state.rs

@@ -4,14 +4,14 @@ pub fn runtime_dir() -> PathBuf {
     if let Ok(dir) = std::env::var("RSS_STATE_DIR") {
         return PathBuf::from(dir);
     }
-    if let Ok(dir) = std::env::var("XDG_RUNTIME_DIR") {
-        return PathBuf::from(dir).join("rss");
+    PathBuf::from("/tmp/rss")
+}
+
+pub fn socket_path() -> PathBuf {
+    if let Ok(p) = std::env::var("RSS_SOCKET") {
+        return PathBuf::from(p);
     }
-    if let Ok(home) = std::env::var("HOME") {
-        return PathBuf::from(home).join(".local/share/rss");
-    }
-    let user = std::env::var("USER").unwrap_or_else(|_| "unknown".into());
-    PathBuf::from(format!("/tmp/rss-{}", user))
+    PathBuf::from("/tmp/rss/rss.sock")
 }
 
 pub fn config_dir() -> PathBuf {
@@ -24,13 +24,6 @@ pub fn config_dir() -> PathBuf {
     PathBuf::from("/etc/rss")
 }
 
-pub fn socket_path() -> PathBuf {
-    if let Ok(p) = std::env::var("RSS_SOCKET") {
-        return PathBuf::from(p);
-    }
-    runtime_dir().join("rss.sock")
-}
-
 pub fn daemon_pid_path() -> PathBuf {
     runtime_dir().join("daemon.pid")
 }
@@ -40,7 +33,7 @@ pub fn log_path(name: &str) -> PathBuf {
 }
 
 pub fn enabled_path(name: &str) -> PathBuf {
-    config_dir().join("enabled").join(name)
+    runtime_dir().join("enabled").join(name)
 }
 
 pub fn write_pid(path: &PathBuf) -> std::io::Result<()> {
@@ -68,7 +61,7 @@ pub fn disable(name: &str) {
 }
 
 pub fn list_enabled() -> std::io::Result<Vec<String>> {
-    let dir = config_dir().join("enabled");
+    let dir = runtime_dir().join("enabled");
     if !dir.exists() {
         return Ok(Vec::new());
     }