commit 07898e752cf02518508f193a0be2e451450044bd
author George Karpenkov <cheshire@google.com> Wed May 20 11:28:10 2020 -0700
committer TensorFlower Gardener <gardener@tensorflow.org> Wed May 20 11:31:08 2020 -0700
tree 214399f621258ed6a47a3f53eb206928c830e79f
parent be0672e8d66c1fabe2b7be7d558e19125da1696d

Provide a more informative error message when the bazel version check fails

Currently, if the version check fails, the error message is:

```
subprocess.CalledProcessError: Command '['bazel', '--batch', '--bazelrc=/dev/null', 'version']' returned non-zero exit status 1.
```

After this patch, it becomes:

```
Error checking bazel version:  ERROR: The project you're trying to build requires Bazel 3.0.0 (specified in /usr/local/google/home/cheshire/code/opensource/docker_tf/tensorflow/.bazelversion), but it wasn't found in /usr/bin.

You can install the required Bazel version via apt:
  sudo apt update && sudo apt install bazel-3.0.0
```

PiperOrigin-RevId: 312520687
Change-Id: I41523f7defa3db10aa34b6b313d6b65c792b2020

configure.py

diff --git a/configure.py b/configure.py
index 9154000..0a5b8717 100644
--- a/configure.py
+++ b/configure.py
@@ -1368,8 +1368,13 @@
   # environment variables.
   environ_cp = dict(os.environ)
 
-  current_bazel_version = check_bazel_version(_TF_MIN_BAZEL_VERSION,
-                                              _TF_MAX_BAZEL_VERSION)
+  try:
+    current_bazel_version = check_bazel_version(_TF_MIN_BAZEL_VERSION,
+                                                _TF_MAX_BAZEL_VERSION)
+  except subprocess.CalledProcessError as e:
+    print("Error checking bazel version: ", e.output.decode('UTF-8').strip())
+    raise e
+
   _TF_CURRENT_BAZEL_VERSION = convert_version_to_int(current_bazel_version)
 
   reset_tf_configure_bazelrc()