129 lines
4.0 KiB
Python
129 lines
4.0 KiB
Python
# Copyright 2018 The Bazel Authors. All rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Skylib module containing functions for checking Bazel versions."""
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def _get_bazel_version():
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"""Returns the current Bazel version"""
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return native.bazel_version
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def _extract_version_number(bazel_version):
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"""Extracts the semantic version number from a version string
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Args:
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bazel_version: the version string that begins with the semantic version
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e.g. "1.2.3rc1 abc1234" where "abc1234" is a commit hash.
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Returns:
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The semantic version string, like "1.2.3".
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"""
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for i in range(len(bazel_version)):
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c = bazel_version[i]
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if not (c.isdigit() or c == "."):
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return bazel_version[:i]
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return bazel_version
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# Parse the bazel version string from `native.bazel_version`.
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# e.g.
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# "0.10.0rc1 abc123d" => (0, 10, 0)
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# "0.3.0" => (0, 3, 0)
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def _parse_bazel_version(bazel_version):
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"""Parses a version string into a 3-tuple of ints
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int tuples can be compared directly using binary operators (<, >).
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Args:
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bazel_version: the Bazel version string
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Returns:
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An int 3-tuple of a (major, minor, patch) version.
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"""
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version = _extract_version_number(bazel_version)
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return tuple([int(n) for n in version.split(".")])
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def _is_at_most(threshold, version):
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"""Check that a version is lower or equals to a threshold.
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Args:
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threshold: the maximum version string
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version: the version string to be compared to the threshold
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Returns:
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True if version <= threshold.
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"""
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return _parse_bazel_version(version) <= _parse_bazel_version(threshold)
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def _is_at_least(threshold, version):
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"""Check that a version is higher or equals to a threshold.
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Args:
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threshold: the minimum version string
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version: the version string to be compared to the threshold
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Returns:
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True if version >= threshold.
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"""
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return _parse_bazel_version(version) >= _parse_bazel_version(threshold)
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def _check_bazel_version(minimum_bazel_version, maximum_bazel_version = None, bazel_version = None):
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"""Check that the version of Bazel is valid within the specified range.
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Args:
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minimum_bazel_version: minimum version of Bazel expected
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maximum_bazel_version: maximum version of Bazel expected
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bazel_version: the version of Bazel to check. Used for testing, defaults to native.bazel_version
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"""
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if not bazel_version:
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if "bazel_version" not in dir(native):
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fail("Current Bazel version is lower than 0.2.1; expected at least {}".format(
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minimum_bazel_version,
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))
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elif not native.bazel_version:
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# Using a non-release version, assume it is good.
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return
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else:
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bazel_version = native.bazel_version
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if not _is_at_least(
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threshold = minimum_bazel_version,
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version = bazel_version,
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):
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fail("Current Bazel version is {}; expected at least {}".format(
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bazel_version,
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minimum_bazel_version,
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))
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if maximum_bazel_version:
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if not _is_at_most(
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threshold = maximum_bazel_version,
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version = bazel_version,
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):
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fail("Current Bazel version is {}; expected at most {}".format(
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bazel_version,
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maximum_bazel_version,
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))
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pass
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versions = struct(
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get = _get_bazel_version,
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parse = _parse_bazel_version,
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check = _check_bazel_version,
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is_at_most = _is_at_most,
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is_at_least = _is_at_least,
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)
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