From 5a790239be6d70f65447c0a0e69d593fe2fa2305 Mon Sep 17 00:00:00 2001
From: Jon Thacker <thacker.jon@gmail.com>
Date: Thu, 27 Dec 2018 10:20:11 -0800
Subject: [PATCH] Fix endless while loop on EOF for pty process

os.read spec says that when EOF is reached by the fd, an empty bytes
object is returned.
---
 src/execution/process_pty.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/execution/process_pty.py b/src/execution/process_pty.py
index 48d1415a..43de6ec7 100644
--- a/src/execution/process_pty.py
+++ b/src/execution/process_pty.py
@@ -72,6 +72,8 @@ def pipe_process_output(self):
                     while True:
                         try:
                             chunk = os.read(self.pty_master, max_read_bytes)
+                            if not chunk:
+                                break
                             data += chunk
 
                         except BlockingIOError: