Issue 96, don't crash on closed stdin

src/zelos/handles/base_handles.py

@@ -317,9 +317,18 @@ def __init__(self, processes, hook_manager, file_system):
 
         def init_handles(p):
             # Add some default system handles
-            if not sys.stdin.isatty() and isinstance(
-                sys.stdin, io.TextIOWrapper
-            ):
+            try:
+                passthrough_stdin = not sys.stdin.isatty() and isinstance(
+                    sys.stdin, io.TextIOWrapper
+                )
+            except ValueError:  # stdin was closed
+                self.logger.notice(
+                    "stdin was closed, not redirecting to emulated stdin"
+                )
+                passthrough_stdin = False
+
+            if passthrough_stdin:
+                self.logger.info("Passing stdin to emulated program")
                 self.new_file(
                     "stdin_redirect",
                     handle_num=0,

tests/test_handles.py

@@ -110,6 +110,16 @@ def test_stdin_redirect(self):
                 z.start()
                 self.assertIn("string is: test data", stdout.getvalue())
 
+    def test_issue_96_closing_stdin(self):
+        # Zelos shouldn't crash if stdin is closed before zelos is
+        # initialized.
+        new_stdin = io.TextIOWrapper(
+            io.BufferedReader(io.BytesIO(b"test data"))
+        )
+        with patch("sys.stdin", new=new_stdin):
+            new_stdin.close()
+            Zelos(None)
+
 
 def main():
     unittest.main()