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# -*- coding: UTF-8 -*-
# Copyright © 2010 Piotr Ożarowski <piotr@debian.org>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
import logging
import re
from ConfigParser import SafeConfigParser
from os.path import exists, dirname, join
from types import GeneratorType
# will be overriden via debian_defaults file few lines later
SUPPORTED = [(2, 7),]
DEFAULT = (2, 7)
RANGE_PATTERN = r'(-)?(\d\.\d+)(?:(-)(\d\.\d+)?)?'
RANGE_RE = re.compile(RANGE_PATTERN)
log = logging.getLogger(__name__)
# try to read debian_defaults and get a list of supported Python versions and
# the default one from there
_config = SafeConfigParser()
_config.read(['/usr/share/python/debian_defaults',
join(dirname(__file__), '..', 'debian', 'debian_defaults')])
try:
DEFAULT = tuple(int(i) for i in _config.get('DEFAULT',
'default-version')[6:].split('.'))
except Exception:
log.exception('cannot read debian_defaults')
try:
SUPPORTED = tuple(tuple(int(j) for j in i.strip()[6:].split('.'))\
for i in _config.get('DEFAULT',
'supported-versions').split(','))
except Exception:
log.exception('cannot read debian_defaults')
def get_requested_versions(vrange=None, available=None):
"""Return a set of requested and supported Python versions.
:param available: if set to `True`, return installed versions only,
if set to `False`, return requested versions that are not installed.
By default returns all requested versions.
:type available: bool
>>> sorted(get_requested_versions([(2, 5), (3, 0)]))
[(2, 6), (2, 7)]
>>> sorted(get_requested_versions('')) == sorted(SUPPORTED)
True
>>> sorted(get_requested_versions([None, None])) == sorted(SUPPORTED)
True
>>> get_requested_versions([(5, 0), None])
set([])
"""
if isinstance(vrange, basestring):
vrange = parse_vrange(vrange)
if not vrange or list(vrange) == [None, None]:
versions = set(SUPPORTED)
else:
minv = (0, 0) if vrange[0] is None else vrange[0]
maxv = (99, 99) if vrange[1] is None else vrange[1]
if minv == maxv:
versions = set((minv,) if minv in SUPPORTED else tuple())
else:
versions = set(v for v in SUPPORTED if minv <= v < maxv)
if available:
versions = set(v for v in versions \
if exists("/usr/bin/python%d.%d" % v))
elif available is False:
versions = set(v for v in versions \
if not exists("/usr/bin/python%d.%d" % v))
return versions
def parse_vrange(value):
"""Return minimum and maximum Python version from given range.
>>> parse_vrange('2.4-')
((2, 4), None)
>>> parse_vrange('2.4-2.6')
((2, 4), (2, 6))
>>> parse_vrange('2.4-3.0')
((2, 4), (3, 0))
>>> parse_vrange('-2.7')
(None, (2, 7))
>>> parse_vrange('2.5')
((2, 5), (2, 5))
>>> parse_vrange('') == parse_vrange('-') == (None, None)
True
"""
if value in ('', '-'):
return None, None
match = RANGE_RE.match(value)
if not match:
raise ValueError("version range is invalid: %s" % value)
groups = match.groups()
if list(groups).count(None) == 3: # only one version is allowed
minv = tuple(int(i) for i in groups[1].split('.'))
return minv, minv
minv = maxv = None
if groups[0]: # maximum version only
maxv = groups[1]
else:
minv = groups[1]
maxv = groups[3]
minv = tuple(int(i) for i in minv.split('.')) if minv else None
maxv = tuple(int(i) for i in maxv.split('.')) if maxv else None
if maxv and minv and minv > maxv:
raise ValueError("version range is invalid: %s" % value)
return minv, maxv
def parse_pycentral_vrange(value):
"""Parse XS-Python-Version.
>>> parse_pycentral_vrange('current') == (DEFAULT, DEFAULT)
True
>>> parse_pycentral_vrange('all')
(None, None)
>>> parse_pycentral_vrange('all, >= 2.4')
((2, 4), None)
>>> parse_pycentral_vrange('all, << 3.0')
(None, (3, 0))
>>> parse_pycentral_vrange('2.6')
((2, 6), (2, 6))
>>> parse_pycentral_vrange('2.5, 2.6')
((2, 5), None)
"""
get = lambda x: get_requested_versions(parse_vrange(x))
current = False
minv = maxv = None
hardcoded = set()
for item in value.split(','):
item = item.strip()
if item == 'all':
continue
elif item == 'current':
current = True
continue
match = re.match('>=\s*([\d\.]+)', item)
if match:
minv = "%.3s" % match.group(1)
continue
match = re.match('<<\s*([\d\.]+)', item)
if match:
maxv = "%.3s" % match.group(1)
continue
match = re.match('^[\d\.]+$', item)
if match:
hardcoded.add("%.3s" % match.group(0))
if len(hardcoded) == 1:
ver = hardcoded.pop()
return getver(ver), getver(ver)
if not minv and hardcoded:
# yeah, no maxv!
minv = sorted(hardcoded)[0]
if current:
versions = sorted(get("%s-%s" % (minv if minv else '', \
maxv if maxv else '')))
if not versions:
raise ValueError("version range doesn't match installed Python versions: %s" % value)
# not really what "current" means...
if DEFAULT in versions:
return DEFAULT, DEFAULT
else:
return versions[0], versions[0]
return getver(minv) if minv else None, \
getver(maxv) if maxv else None
def vrange_str(vrange):
"""Return version range string from given range.
>>> vrange_str(((2, 4), None))
'2.4-'
>>> vrange_str(((2, 4), (2, 6)))
'2.4-2.6'
>>> vrange_str(((2, 4), (3, 0)))
'2.4-3.0'
>>> vrange_str((None, (2, 7)))
'-2.7'
>>> vrange_str(((2, 5), (2, 5)))
'2.5'
>>> vrange_str((None, None))
'-'
"""
if vrange[0] is vrange[1] is None:
return '-'
if vrange[0] == vrange[1]:
return '.'.join(str(i) for i in vrange[0])
elif vrange[0] is None:
return '-' + '.'.join(str(i) for i in vrange[1])
elif vrange[1] is None:
return '.'.join(str(i) for i in vrange[0]) + '-'
else:
return "%s-%s" % ('.'.join(str(i) for i in vrange[0]),
'.'.join(str(i) for i in vrange[1]))
def vrepr(value):
"""
>>> vrepr(([2, 7], [3, 2]))
['2.7', '3.2']
>>> vrepr(('2.6', '3.1'))
['2.6', '3.1']
>>> vrepr('2.7')
'2.7'
>>> vrepr((2, 7))
'2.7'
"""
if isinstance(value, basestring):
return value
elif not isinstance(value, (GeneratorType, set))\
and isinstance(value[0], int):
return '.'.join(str(i) for i in value)
result = []
for version in value:
if isinstance(version, basestring):
result.append(version)
else:
result.append('.'.join(str(i) for i in version))
return result
def getver(value):
"""Return pair of integers that represent version.
>>> getver('2.5')
(2, 5)
>>> getver('2.6.4')
(2, 6)
>>> getver(None)
''
"""
if not value:
return ''
return tuple(int(i) for i in value.split('.', 2))[:2]
def debsorted(versions, return_str=None):
"""Return sorted list of versions starting with default Python
version (if available) then list of suppored versions greater than default
one followed by reversed list of older versions.
List of versions sorted this way can be used in Depends field.
:param vrepr: return string represenatations of versions, by default the
same format is used as in :param:`versions`
>>> debsorted([(2, 6), (3, 1), (2, 5), (2, 4), (2, 7)])[0] == DEFAULT
True
>>> debsorted(('2.4', '3.2', '2.6', '2.7'))[-1]
(2, 4)
>>> debsorted(set([(2, 1), (2, 2)]))
[(2, 2), (2, 1)]
>>> debsorted([(2, 1), (2, 2)], return_str=True)
['2.2', '2.1']
"""
result = []
old_versions = []
for version in sorted(versions):
if isinstance(version, basestring):
version = getver(version)
if version < DEFAULT:
old_versions.append(version)
else:
result.append(version)
result.extend(reversed(old_versions))
if return_str and result:
return vrepr(result)
return result
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