fix: Deno.Command - improve error message when cwd is not a directory (#20460)

cli/tests/unit/command_test.ts

@@ -424,6 +424,31 @@ Deno.test({ permissions: { run: true } }, function commandSyncNotFound() {
   );
 });
 
+Deno.test({ permissions: { run: true, read: true } }, function cwdNotFound() {
+  assertThrows(
+    () =>
+      new Deno.Command(Deno.execPath(), {
+        cwd: Deno.cwd() + "/non-existent-directory",
+      }).output(),
+    Deno.errors.NotFound,
+    "No such cwd",
+  );
+});
+
+Deno.test(
+  { permissions: { run: true, read: true } },
+  function cwdNotDirectory() {
+    assertThrows(
+      () =>
+        new Deno.Command(Deno.execPath(), {
+          cwd: Deno.execPath(),
+        }).output(),
+      Deno.errors.NotFound,
+      "cwd is not a directory",
+    );
+  },
+);
+
 Deno.test(
   { permissions: { run: true, read: true } },
   async function commandFailedWithCode() {
@@ -892,12 +917,12 @@ Deno.test(
     assertThrows(
       () => new Deno.Command("doesntexist").outputSync(),
       Error,
-      "Failed to spawn: doesntexist",
+      "Failed to spawn 'doesntexist'",
     );
     await assertRejects(
       async () => await new Deno.Command("doesntexist").output(),
       Error,
-      "Failed to spawn: doesntexist",
+      "Failed to spawn 'doesntexist'",
     );
   },
 );

runtime/ops/process.rs

@@ -286,12 +286,53 @@ fn spawn_child(
   // We want to kill child when it's closed
   command.kill_on_drop(true);
 
-  let mut child = command.spawn().with_context(|| {
-    format!(
-      "Failed to spawn: {}",
-      command.as_std().get_program().to_string_lossy()
-    )
-  })?;
+  let mut child = match command.spawn() {
+    Ok(child) => child,
+    Err(err) => {
+      let command = command.as_std();
+      let command_name = command.get_program().to_string_lossy();
+
+      if let Some(cwd) = command.get_current_dir() {
+        // launching a sub process always depends on the real
+        // file system so using these methods directly is ok
+        #[allow(clippy::disallowed_methods)]
+        if !cwd.exists() {
+          return Err(
+            std::io::Error::new(
+              std::io::ErrorKind::NotFound,
+              format!(
+                "Failed to spawn '{}': No such cwd '{}'",
+                command_name,
+                cwd.to_string_lossy()
+              ),
+            )
+            .into(),
+          );
+        }
+
+        #[allow(clippy::disallowed_methods)]
+        if !cwd.is_dir() {
+          return Err(
+            std::io::Error::new(
+              std::io::ErrorKind::NotFound,
+              format!(
+                "Failed to spawn '{}': cwd is not a directory '{}'",
+                command_name,
+                cwd.to_string_lossy()
+              ),
+            )
+            .into(),
+          );
+        }
+      }
+
+      return Err(AnyError::from(err).context(format!(
+        "Failed to spawn '{}'",
+        command.get_program().to_string_lossy()
+      )));
+    }
+  };
+
   let pid = child.id().expect("Process ID should be set.");
 
   let stdin_rid = child
@@ -362,7 +403,7 @@ fn op_spawn_sync(
   let mut command = create_command(state, args, "Deno.Command().outputSync()")?;
   let output = command.output().with_context(|| {
     format!(
-      "Failed to spawn: {}",
+      "Failed to spawn '{}'",
       command.get_program().to_string_lossy()
     )
   })?;