From 7d62c79ab7606d99ba1db7e54a67d65aee055ddb Mon Sep 17 00:00:00 2001
From: David Wilson <dw@botanicus.net>
Date: Sat, 11 Aug 2018 17:46:44 +0100
Subject: [PATCH] docker: redirect stderr to stdout for nicer exceptions.

Unclear whether or not this is a hack, or whether it should be the
default for more connection methods. When enabled, the exception text
thrown when bootstrap fails includes the stderr text, which is
apparently always useful.
---
 mitogen/docker.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/mitogen/docker.py b/mitogen/docker.py
index 38ee9d4e..36b0635b 100644
--- a/mitogen/docker.py
+++ b/mitogen/docker.py
@@ -43,6 +43,11 @@ class Stream(mitogen.parent.Stream):
     username = None
     docker_path = 'docker'
 
+    # TODO: better way of capturing errors such as "No such container."
+    create_child_args = {
+        'merge_stdio': True
+    }
+
     def construct(self, container=None, image=None,
                   docker_path=None, username=None,
                   **kwargs):