# Copyright 2017 The Bazel Authors. All rights reserved.

#

# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

#

# http://www.apache.org/licenses/LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

# From https://github.com/tensorflow/tensorflow/blob/5541ef4fbba56cf8930198373162dd3119e6ee70/tensorflow/workspace.bzl#L44

# Parse the bazel version string from `native.bazel_version`.

# The format is "<major>.<minor>.<patch>-<date> <commit>"

# Returns a 3-tuple of numbers: (<major>, <minor>, <patch>)

def _parse_bazel_version(bazel_version):

# Remove commit from version.

version = bazel_version.split(" ", 1)[0]

# Split into (release, date) parts and only return the release

# as a tuple of integers.

parts = version.split("-", 1)

# Handle format x.x.xrcx

parts = parts[0].split("rc", 1)

# Turn "release" into a tuple of numbers

version_tuple = ()

for number in parts[0].split("."):

version_tuple += (int(number),)

return version_tuple

# Check that a specific bazel version is being used.

# Args: bazel_version in the form "<major>.<minor>.<patch>"

def check_bazel_version(bazel_version):

if "bazel_version" not in dir(native):

fail("\nCurrent Bazel version is lower than 0.2.1, expected at least %s\n" %

bazel_version)

elif not native.bazel_version:

print("\nCurrent Bazel is not a release version, cannot check for " +

"compatibility.")

print("Make sure that you are running at least Bazel %s.\n" % bazel_version)

else:

current_bazel_version = _parse_bazel_version(native.bazel_version)

minimum_bazel_version = _parse_bazel_version(bazel_version)

if minimum_bazel_version > current_bazel_version:

fail("\nCurrent Bazel version is {}, expected at least {}\n".format(

native.bazel_version, bazel_version))