node: Restrict use of systemd to Linux not Unix

Building with Zigbuild for macOS caused build issues. Strengthen the
condition for using systemd from the Unix family to Linux specifically.

crates/radicle-node/Cargo.toml

@@ -39,7 +39,6 @@ radicle-fetch = { workspace = true }
 radicle-git-ext = { workspace = true, features = ["serde"] }
 radicle-protocol = { workspace = true }
 radicle-signals = { workspace = true }
-radicle-systemd = { workspace = true, optional = true }
 sqlite = { workspace = true, features = ["bundled"] }
 scrypt = { version = "0.11.0", default-features = false }
 serde = { workspace = true, features = ["derive"] }
@@ -49,6 +48,9 @@ socket2 = "0.5.7"
 tempfile = { workspace = true }
 thiserror = { workspace = true }
 
+[target.'cfg(target_os = "linux")'.dependencies]
+radicle-systemd = { workspace = true, optional = true }
+
 [dev-dependencies]
 qcheck = { workspace = true }
 qcheck-macros = { workspace = true }
@@ -56,4 +58,4 @@ radicle = { workspace = true, features = ["test"] }
 radicle-protocol = { workspace = true, features = ["test"] }
 radicle-crypto = { workspace = true, features = ["test", "cyphernet"] }
 snapbox = { workspace = true }
-test-log = "0.2.18"
+test-log = "0.2.18"

crates/radicle-node/src/main.rs

@@ -93,10 +93,15 @@ fn execute() -> anyhow::Result<()> {
     let level = options.log.unwrap_or(config.node.log);
 
     let logger = {
-        let journal = if cfg!(all(feature = "systemd", target_family = "unix")) {
-            radicle_systemd::journal::logger::<&str, &str, _>("radicle-node".to_string(), [])?
-        } else {
-            None
+        let journal = {
+            #[cfg(all(feature = "systemd", target_os = "linux"))]
+            {
+                radicle_systemd::journal::logger::<&str, &str, _>("radicle-node".to_string(), [])?
+            }
+            #[cfg(not(all(feature = "systemd", target_os = "linux")))]
+            {
+                None
+            }
         };
 
         if let Some(logger) = journal {

crates/radicle-node/src/runtime.rs

@@ -344,7 +344,7 @@ impl Runtime {
         Ok(())
     }
 
-    #[cfg(all(feature = "systemd", target_family = "unix"))]
+    #[cfg(all(feature = "systemd", target_os = "linux"))]
     fn receive_listener() -> Option<UnixListener> {
         use std::os::fd::FromRawFd;
         match radicle_systemd::listen::fd("control") {
@@ -371,7 +371,7 @@ impl Runtime {
     }
 
     fn bind(path: PathBuf) -> Result<ControlSocket, Error> {
-        #[cfg(all(feature = "systemd", target_family = "unix"))]
+        #[cfg(all(feature = "systemd", target_os = "linux"))]
         {
             if let Some(listener) = Self::receive_listener() {
                 log::info!(target: "node", "Received control socket.");