| """ Helpers to check minimum version of bazel.""" |
| |
| 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 (<, >). |
| |
| Args: |
| bazel_version: the Bazel version string |
| |
| Returns: |
| An int 3-tuple of a (major, minor, patch) version. |
| """ |
| |
| version = _extract_version_number(bazel_version) |
| return tuple([int(n) for n in version.split(".")]) |
| |
| def check_bazel_version_at_least(minimum_bazel_version): |
| if "bazel_version" not in dir(native): |
| fail("\nCurrent Bazel version is lower than 0.2.1, expected at least %s\n" % minimum_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" % minimum_bazel_version) |
| return |
| |
| if _parse_bazel_version(native.bazel_version) < _parse_bazel_version(minimum_bazel_version): |
| fail("\nCurrent Bazel version is {}, expected at least {}\n".format( |
| native.bazel_version, minimum_bazel_version)) |
