Fix build on *BSD, illumos, etc. (#6456)

* nu-path: use 'linux' code on all non-macOS unix

* nu-command: cfg() the Ps command to platforms it's actually implemented on

* nu-system: cfg() the Ps test to the platforms Ps is implemented on

crates/nu-command/src/default_context.rs

@@ -160,10 +160,17 @@ pub fn create_default_context() -> EngineState {
             Exec,
             External,
             NuCheck,
-            Ps,
             Sys,
         };
 
+        #[cfg(any(
+            target_os = "android",
+            target_os = "linux",
+            target_os = "macos",
+            target_os = "windows"
+        ))]
+        bind_command! { Ps };
+
         #[cfg(feature = "which-support")]
         bind_command! { Which };
 

crates/nu-command/src/system/mod.rs

@@ -2,6 +2,12 @@ mod benchmark;
 mod complete;
 mod exec;
 mod nu_check;
+#[cfg(any(
+    target_os = "android",
+    target_os = "linux",
+    target_os = "macos",
+    target_os = "windows"
+))]
 mod ps;
 mod run_external;
 mod sys;
@@ -11,6 +17,12 @@ pub use benchmark::Benchmark;
 pub use complete::Complete;
 pub use exec::Exec;
 pub use nu_check::NuCheck;
+#[cfg(any(
+    target_os = "android",
+    target_os = "linux",
+    target_os = "macos",
+    target_os = "windows"
+))]
 pub use ps::Ps;
 pub use run_external::{External, ExternalCommand};
 pub use sys::Sys;

crates/nu-path/Cargo.toml

@@ -11,5 +11,5 @@ version = "0.67.1"
 dirs-next = "2.0.0"
 dunce = "1.0.1"
 
-[target.'cfg(target_os = "linux")'.dependencies]
+[target.'cfg(all(unix, not(target_os = "macos")))'.dependencies]
 pwd = "1.3.1"

crates/nu-path/src/tilde.rs

@@ -1,4 +1,4 @@
-#[cfg(target_os = "linux")]
+#[cfg(all(unix, not(target_os = "macos")))]
 use pwd::Passwd;
 use std::path::{Path, PathBuf};
 
@@ -45,7 +45,7 @@ fn expand_tilde_with_home(path: impl AsRef<Path>, home: Option<PathBuf>) -> Path
     }
 }
 
-#[cfg(target_os = "linux")]
+#[cfg(all(unix, not(target_os = "macos")))]
 fn user_home_dir(username: &str) -> PathBuf {
     let passwd = Passwd::from_name(username);
     match &passwd.ok() {

crates/nu-system/src/main.rs

@@ -1,13 +1,17 @@
-use std::thread::available_parallelism;
-use std::time::Duration;
-
 fn main() {
-    let cores = match available_parallelism() {
+    #[cfg(any(
+        target_os = "android",
+        target_os = "linux",
+        target_os = "macos",
+        target_os = "windows"
+    ))]
+    {
+        let cores = match std::thread::available_parallelism() {
             Ok(p) => p.get(),
             Err(_) => 1usize,
         };
         for run in 1..=10 {
-        for proc in nu_system::collect_proc(Duration::from_millis(100), false) {
+            for proc in nu_system::collect_proc(std::time::Duration::from_millis(100), false) {
                 if proc.cpu_usage() > 0.00001 {
                     println!(
                         "{} - {} - {} - {} - {:.2}% - {}M - {}M - {} procs",
@@ -25,3 +29,4 @@ fn main() {
             std::thread::sleep(std::time::Duration::from_millis(1000));
         }
     }
+}