107 lines
3.8 KiB
Python
107 lines
3.8 KiB
Python
# Copyright 2020 Canonical Ltd.
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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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import os
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import re
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from functools import total_ordering
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@total_ordering
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class JujuVersion:
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PATTERN = r'''^
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(?P<major>\d{1,9})\.(?P<minor>\d{1,9}) # <major> and <minor> numbers are always there
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((?:\.|-(?P<tag>[a-z]+))(?P<patch>\d{1,9}))? # sometimes with .<patch> or -<tag><patch>
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(\.(?P<build>\d{1,9}))?$ # and sometimes with a <build> number.
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'''
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def __init__(self, version):
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m = re.match(self.PATTERN, version, re.VERBOSE)
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if not m:
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raise RuntimeError('"{}" is not a valid Juju version string'.format(version))
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d = m.groupdict()
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self.major = int(m.group('major'))
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self.minor = int(m.group('minor'))
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self.tag = d['tag'] or ''
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self.patch = int(d['patch'] or 0)
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self.build = int(d['build'] or 0)
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def __repr__(self):
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if self.tag:
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s = '{}.{}-{}{}'.format(self.major, self.minor, self.tag, self.patch)
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else:
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s = '{}.{}.{}'.format(self.major, self.minor, self.patch)
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if self.build > 0:
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s += '.{}'.format(self.build)
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return s
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def __eq__(self, other):
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if self is other:
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return True
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if isinstance(other, str):
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other = type(self)(other)
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elif not isinstance(other, JujuVersion):
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raise RuntimeError('cannot compare Juju version "{}" with "{}"'.format(self, other))
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return (
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self.major == other.major
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and self.minor == other.minor
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and self.tag == other.tag
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and self.build == other.build
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and self.patch == other.patch)
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def __lt__(self, other):
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if self is other:
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return False
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if isinstance(other, str):
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other = type(self)(other)
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elif not isinstance(other, JujuVersion):
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raise RuntimeError('cannot compare Juju version "{}" with "{}"'.format(self, other))
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if self.major != other.major:
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return self.major < other.major
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elif self.minor != other.minor:
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return self.minor < other.minor
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elif self.tag != other.tag:
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if not self.tag:
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return False
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elif not other.tag:
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return True
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return self.tag < other.tag
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elif self.patch != other.patch:
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return self.patch < other.patch
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elif self.build != other.build:
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return self.build < other.build
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return False
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@classmethod
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def from_environ(cls) -> 'JujuVersion':
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"""Build a JujuVersion from JUJU_VERSION."""
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v = os.environ.get('JUJU_VERSION')
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if v is None:
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v = '0.0.0'
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return cls(v)
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def has_app_data(self) -> bool:
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"""Determine whether this juju version knows about app data."""
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return (self.major, self.minor, self.patch) >= (2, 7, 0)
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def is_dispatch_aware(self) -> bool:
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"""Determine whether this juju version knows about dispatch."""
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return (self.major, self.minor, self.patch) >= (2, 8, 0)
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def has_controller_storage(self) -> bool:
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"""Determine whether this juju version supports controller-side storage."""
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return (self.major, self.minor, self.patch) >= (2, 8, 0)
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