appveyor.yml: Install python "six" module.

It is now required for the build.

Thanks to Alin Gabriel Serdean for helping figure out the correct
solution here.

This adds --diable-pip-version-check because upgrading pip (as
suggested by the error that this option suppresses) causes pip
to fail, which is in turn a bug in pip that manifests only on
Windows: https://github.com/pypa/pip/issues/3383.

Signed-off-by: Ben Pfaff <blp@ovn.org>
Acked-by: Alin Gabriel Serdean <aserdean@cloudbasesolutions.com>

diff --git a/appveyor.yml b/appveyor.yml
index 9efddeb..de0b4a5 100644 (file)
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -33,6 +33,8 @@ init:
 
     cd C:\openvswitch
 
+    python -m pip install six --disable-pip-version-check
+
 build_script:
 - '"C:\Program Files (x86)\Microsoft Visual Studio 12.0\Common7\Tools\VsDevCmd"'
 - C:\MinGW\msys\1.0\bin\bash -lc "echo \"C:/MinGW /mingw\" > /etc/fstab"