Remove usage of command-group on unix (#64)

Cargo.toml

@@ -55,7 +55,6 @@ zip = "2.1"
 
 async-once-cell = "0.5"
 async-signal = "0.2"
-command-group = { version = "5.0", features = ["with-tokio"] }
 futures = "0.3"
 reqwest = { version = "0.12", default-features = false, features = [
     "rustls-tls",
@@ -91,6 +90,7 @@ tracing-subscriber = { optional = true, version = "0.3", features = [
 ] }
 
 [target.'cfg(windows)'.dependencies]
+command-group = { version = "5.0", features = ["with-tokio"] }
 winapi = { version = "0.3", features = ["processthreadsapi", "wincon"] }
 winreg = "0.52"
 

lib/system/runner.rs

@@ -1,8 +1,10 @@
 use std::ffi::OsStr;
 use std::io::Result as IoResult;
 
-use async_signal::{Signal, Signals};
+#[cfg(windows)]
 use command_group::AsyncCommandGroup;
+
+use async_signal::{Signal, Signals};
 use futures::StreamExt;
 use tokio::{
     process::Command,
@@ -80,24 +82,30 @@ where
         The newer `process-wrap` crate claims to also support this behavior
         for inheriting process group but it doesn't seem to work as expected.
     */
-    let mut child_handle = Command::new(command)
-        .args(args)
-        .group()
-        .kill_on_drop(true)
-        .spawn()?;
+    let mut command = Command::new(command);
+    let mut child = {
+        #[cfg(unix)]
+        {
+            command.args(args).kill_on_drop(true).spawn()?
+        }
+        #[cfg(windows)]
+        {
+            command.args(args).group().kill_on_drop(true).spawn()?
+        }
+    };
 
     let code = tokio::select! {
         // If the spawned process exits cleanly, we'll return its exit code,
         // which may or may not exist. Interpret a non-existent code as 1.
-        command_result = child_handle.wait() => {
+        command_result = child.wait() => {
             let code = command_result.ok().and_then(|s| s.code()).unwrap_or(1);
             signal_aborter.abort();
             code
         }
         // If the command was manually interrupted by a signal, we will
         // return a special exit code for the signal. More details above.
         task_result = signal_handle => {
-            child_handle.kill().await.ok();
+            child.kill().await.ok();
             task_result.unwrap_or(EXIT_CODE_GOT_SIGNAL)
         }
     };