# Copyright 2020 Canonical Ltd.
#
# 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.
"""A helper to work with the Juju version."""
import os
import re
from functools import total_ordering
from typing import Union
[docs]@total_ordering
class JujuVersion:
"""Helper to work with the Juju version.
It knows how to parse the ``JUJU_VERSION`` environment variable, and
exposes different capabilities according to the specific version. It also
allows users to compare ``JujuVersion`` instances with ``<`` and ``>``
operators.
"""
_pattern_re = re.compile(r'''^
(?P<major>\d{1,9})\.(?P<minor>\d{1,9}) # <major> and <minor> numbers are always there
((?:\.|-(?P<tag>[a-z]+))(?P<patch>\d{1,9}))? # sometimes with .<patch> or -<tag><patch>
(\.(?P<build>\d{1,9}))?$ # and sometimes with a <build> number.
''', re.VERBOSE)
def __init__(self, version: str):
m = self._pattern_re.match(version)
if not m:
raise RuntimeError(f'"{version}" is not a valid Juju version string')
d = m.groupdict()
self.major = int(m.group('major'))
self.minor = int(m.group('minor'))
self.tag = d['tag'] or ''
self.patch = int(d['patch'] or 0)
self.build = int(d['build'] or 0)
def __repr__(self):
if self.tag:
s = f'{self.major}.{self.minor}-{self.tag}{self.patch}'
else:
s = f'{self.major}.{self.minor}.{self.patch}'
if self.build > 0:
s += f'.{self.build}'
return s
def __eq__(self, other: Union[str, 'JujuVersion']) -> bool:
if self is other:
return True
if isinstance(other, str):
other = type(self)(other)
elif not isinstance(other, JujuVersion):
raise RuntimeError(f'cannot compare Juju version "{self}" with "{other}"')
return (
self.major == other.major
and self.minor == other.minor
and self.tag == other.tag
and self.build == other.build
and self.patch == other.patch)
def __lt__(self, other: Union[str, 'JujuVersion']) -> bool:
if self is other:
return False
if isinstance(other, str):
other = type(self)(other)
elif not isinstance(other, JujuVersion):
raise RuntimeError(f'cannot compare Juju version "{self}" with "{other}"')
if self.major != other.major:
return self.major < other.major
elif self.minor != other.minor:
return self.minor < other.minor
elif self.tag != other.tag:
if not self.tag:
return False
elif not other.tag:
return True
return self.tag < other.tag
elif self.patch != other.patch:
return self.patch < other.patch
elif self.build != other.build:
return self.build < other.build
return False
[docs] @classmethod
def from_environ(cls) -> 'JujuVersion':
"""Build a version from the ``JUJU_VERSION`` environment variable."""
v = os.environ.get('JUJU_VERSION')
if v is None:
v = '0.0.0'
return cls(v)
[docs] def has_app_data(self) -> bool:
"""Report whether this Juju version supports app data."""
return (self.major, self.minor, self.patch) >= (2, 7, 0)
[docs] def is_dispatch_aware(self) -> bool:
"""Report whether this Juju version supports dispatch."""
return (self.major, self.minor, self.patch) >= (2, 8, 0)
[docs] def has_controller_storage(self) -> bool:
"""Report whether this Juju version supports controller-side storage."""
return (self.major, self.minor, self.patch) >= (2, 8, 0)
@property
def has_secrets(self) -> bool:
"""Report whether this Juju version supports the "secrets" feature."""
# Juju version 3.0.0 had an initial version of secrets, but:
# * In 3.0.2, secret-get "--update" was renamed to "--refresh", and
# secret-get-info was separated into its own hook tool
# * In 3.0.3, a bug with observer labels was fixed (juju/juju#14916)
return (self.major, self.minor, self.patch) >= (3, 0, 3)
@property
def supports_open_port_on_k8s(self) -> bool:
"""Report whether this Juju version supports open-port on Kubernetes."""
# Support added: https://bugs.launchpad.net/juju/+bug/1920960
return (self.major, self.minor, self.patch) >= (3, 0, 3)
@property
def supports_exec_service_context(self) -> bool:
"""Report whether this Juju version supports exec's service_context option."""
if (self.major, self.minor, self.patch) < (3, 1, 6):
# First released in 3.1.6
return False
if (self.major, self.minor, self.patch) == (3, 2, 0):
# 3.2.0 was released before Pebble was updated, but all other 3.2
# releases have the change (3.2.1 tag was never released).
return False
return True