[PATCH 2/6] HACKS: pass stderr along in kfigure.py

[Daniel Vetter]

Some addition comments on the implementation:
- Also needs to be hacked up for svg conversion.
- Inline kernel-render creates temp files and caches them, doesn't
  seem that good an idea. Probably should switch over to using pipes.
- Reimplements sphinx' depency tracking. Might be fixable if we just
  use pipes (and using the sphinx functions to open/read files).
- Linenumbers are off, but no idea how to fix that.
- Script looks a bit complicated to me, but I don't have python clue.

Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
---
 Documentation/sphinx/kfigure.py | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/Documentation/sphinx/kfigure.py b/Documentation/sphinx/kfigure.py
index 76425b461a40..d6819337edf6 100644
--- a/Documentation/sphinx/kfigure.py
+++ b/Documentation/sphinx/kfigure.py
@@ -50,6 +50,7 @@ import os
 from os import path
 import subprocess
 from hashlib import sha1
+import sys
 
 from docutils import nodes
 from docutils.statemachine import ViewList
@@ -278,11 +279,16 @@ def dot2format(dot_fname, out_fname):
 
     """
     out_format = path.splitext(out_fname)[1][1:]
-    cmd = [dot_cmd, '-T%s' % out_format, dot_fname]
+    cmd = [dot_cmd, '-T%s' % out_format, dot_fname, '-v']
     exit_code = 42
     with open(out_fname, "w") as out:
-        exit_code = subprocess.call(
+        p = subprocess.Popen(
             cmd, stdout = out, stderr = subprocess.PIPE )
+        meh, err = p.communicate()
+
+        sys.stderr.write(err)
+
+        exit_code = p.returncode
         out.flush()
     return bool(exit_code == 0)
 
-- 
2.11.0