How to build a shared library for TensorFlow on Travis-CI

Question

I'm assisting in building a Ruby-wrapper for TensorFlow. Obviously. we'd want to setup automatic test of the project and so I'm currently trying struggling to configure Travis-CI to build the project and run tests like I can on my own machine (OSX El Capitan).

My question is: What is the magic that needs to go in the .travis.yml-file to properly bazel build a shared lib (tensorflow.so) for TensorFlow?

As far as I can tell, I've successfully installed TensorFlow's dependencies, including Google's build tool Bazel, but Travis-CI still can't build. As of this writing the bazel build command fails with the message:

...
...
INFO: Building...
[1 / 13] Writing file external/gif_archive/libgif.so-2.params
[3 / 13] Compiling external/gif_archive/giflib-5.1.4/lib/egif_lib.c
ERROR: /home/travis/.cache/bazel/_bazel_travis/1a58902034d650eeef2a9da5b1248179/external/gif_archive/BUILD:14:1: C++ compilation of rule '@gif_archive//:gif' failed: namespace-sandbox failed: error executing command 
  (cd /home/travis/.cache/bazel/_bazel_travis/1a58902034d650eeef2a9da5b1248179/execroot/tensorflow && \
  exec env - \
...
...
The command "bazel build --verbose_failures=1 @gif_archive//:gif" failed and exited with 1 during .

https://travis-ci.org/chrhansen/tensorflow.rb/builds/145716589

Note: I've noticed that the guys over at github.com/node-tensorflow/node-tensorflow successfully made this happen: https://travis-ci.org/node-tensorflow/node-tensorflow/builds

UPDATE: https://github.com/tensorflow/tensorflow/issues/3374

Answer 1

The issue has been solved (https://github.com/tensorflow/tensorflow/issues/3374), you should be able to build tensorflow with sandbox enabled.