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""" 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,
))
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