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# Copyright 2018 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.
"""Skylib module containing functions for checking Bazel versions."""
def _get_bazel_version():
"""Returns the current Bazel version"""
return native.bazel_version
def _extract_version_number(bazel_version):
"""Extracts the semantic version number from a version string
Args:
bazel_version: the version string that begins with the semantic version
e.g. "1.2.3rc1 abc1234" where "abc1234" is a commit hash.
Returns:
The semantic version string, like "1.2.3".
"""
for i in range(len(bazel_version)):
c = bazel_version[i]
if not (c.isdigit() or c == "."):
return bazel_version[:i]
return bazel_version
# Parse the bazel version string from `native.bazel_version`.
# e.g.
# "0.10.0rc1 abc123d" => (0, 10, 0)
# "0.3.0" => (0, 3, 0)
def _parse_bazel_version(bazel_version):
"""Parses a version string into a 3-tuple of ints
int tuples can be compared directly using binary operators (<, >).
For a development build of Bazel, this returns an unspecified version tuple
that compares higher than any released version.
Args:
bazel_version: the Bazel version string
Returns:
An int 3-tuple of a (major, minor, patch) version.
"""
version = _extract_version_number(bazel_version)
if not version:
return (999999, 999999, 999999)
return tuple([int(n) for n in version.split(".")])
def _is_at_most(threshold, version):
"""Check that a version is lower or equals to a threshold.
Args:
threshold: the maximum version string
version: the version string to be compared to the threshold
Returns:
True if version <= threshold.
"""
return _parse_bazel_version(version) <= _parse_bazel_version(threshold)
def _is_at_least(threshold, version):
"""Check that a version is higher or equals to a threshold.
Args:
threshold: the minimum version string
version: the version string to be compared to the threshold
Returns:
True if version >= threshold.
"""
return _parse_bazel_version(version) >= _parse_bazel_version(threshold)
def _check_bazel_version(minimum_bazel_version, maximum_bazel_version = None, bazel_version = None):
"""Check that the version of Bazel is valid within the specified range.
Args:
minimum_bazel_version: minimum version of Bazel expected
maximum_bazel_version: maximum version of Bazel expected
bazel_version: the version of Bazel to check. Used for testing, defaults to native.bazel_version
"""
if not bazel_version:
if "bazel_version" not in dir(native):
fail("Current Bazel version is lower than 0.2.1; expected at least {}".format(
minimum_bazel_version,
))
elif not native.bazel_version:
# Using a non-release version, assume it is good.
return
else:
bazel_version = native.bazel_version
if not _is_at_least(
threshold = minimum_bazel_version,
version = bazel_version,
):
fail("Current Bazel version is {}; expected at least {}".format(
bazel_version,
minimum_bazel_version,
))
if maximum_bazel_version:
if not _is_at_most(
threshold = maximum_bazel_version,
version = bazel_version,
):
fail("Current Bazel version is {}; expected at most {}".format(
bazel_version,
maximum_bazel_version,
))
pass
versions = struct(
get = _get_bazel_version,
parse = _parse_bazel_version,
check = _check_bazel_version,
is_at_most = _is_at_most,
is_at_least = _is_at_least,
)
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