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#!/usr/bin/python
# LSB release detection module for Debian
# (C) 2005-09 Chris Lawrence <lawrencc@debian.org>
# This package is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 dated June, 1991.
# This package is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this package; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
# 02111-1307, USA.
import sys
import commands
import os
import re
# XXX: Update as needed
# This should really be included in apt-cache policy output... it is already
# in the Release file...
RELEASE_CODENAME_LOOKUP = {
'1.1' : 'buzz',
'1.2' : 'rex',
'1.3' : 'bo',
'2.0' : 'hamm',
'2.1' : 'slink',
'2.2' : 'potato',
'3.0' : 'woody',
'3.1' : 'sarge',
'4.0' : 'etch',
'5.0' : 'lenny',
}
TESTING_CODENAME = 'unknown.new.testing'
def lookup_codename(release, unknown=None):
m = re.match(r'(\d+)\.(\d+)(r(\d+))?', release)
if not m:
return unknown
shortrelease = '%s.%s' % m.group(1,2)
return RELEASE_CODENAME_LOOKUP.get(shortrelease, unknown)
# LSB compliance packages... may grow eventually
PACKAGES = 'lsb-core lsb-cxx lsb-graphics lsb-desktop lsb-qt4 lsb-languages lsb-multimedia lsb-printing'
modnamere = re.compile(r'lsb-(?P<module>[a-z0-9]+)-(?P<arch>[^ ]+)(?: \(= (?P<version>[0-9.]+)\))?')
def valid_lsb_versions(version, module):
# If a module is ever released that only appears in >= version, deal
# with that here
if version == '3.0':
return ['2.0', '3.0']
elif version == '3.1':
if module in ('desktop', 'qt4'):
return ['3.1']
else:
return ['2.0', '3.0', '3.1']
elif version == '3.2':
if module == 'desktop':
return ['3.1', '3.2']
elif module == 'qt4':
return ['3.1']
elif module in ('printing', 'languages', 'multimedia'):
return ['3.2']
elif module == 'cxx':
return ['3.0', '3.1', '3.2']
else:
return ['2.0', '3.0', '3.1', '3.2']
elif version == '4.0':
if module == 'desktop':
return ['3.1', '3.2', '4.0']
elif module == 'qt4':
return ['3.1']
elif module in ('printing', 'languages', 'multimedia'):
return ['3.2', '4.0']
elif module == 'security':
return ['4.0']
elif module == 'cxx':
return ['3.0', '3.1', '3.2', '4.0']
else:
return ['2.0', '3.0', '3.1', '3.2', '4.0']
return [version]
try:
set # introduced in 2.4
except NameError:
import sets
set = sets.Set
# This is Debian-specific at present
def check_modules_installed():
# Find which LSB modules are installed on this system
output = commands.getoutput("dpkg-query -f '${Version} ${Provides}\n' -W %s 2>/dev/null" % PACKAGES)
if not output:
return []
modules = set()
for line in output.split(os.linesep):
version, provides = line.split(' ', 1)
version = version.split('-', 1)[0]
for pkg in provides.split(','):
mob = modnamere.search(pkg)
if not mob:
continue
mgroups = mob.groupdict()
# If no versioned provides...
if mgroups.get('version'):
module = '%(module)s-%(version)s-%(arch)s' % mgroups
modules.add(module)
else:
module = mgroups['module']
for v in valid_lsb_versions(version, module):
mgroups['version'] = v
module = '%(module)s-%(version)s-%(arch)s' % mgroups
modules.add(module)
modules = list(modules)
modules.sort()
return modules
longnames = {'v' : 'version', 'o': 'origin', 'a': 'suite',
'c' : 'component', 'l': 'label'}
def parse_policy_line(data):
retval = {}
bits = data.split(',')
for bit in bits:
kv = bit.split('=', 1)
if len(kv) > 1:
k, v = kv[:2]
if k in longnames:
retval[longnames[k]] = v
return retval
def parse_apt_policy():
data = []
policy = commands.getoutput('LANG=C apt-cache policy 2>/dev/null')
for line in policy.split('\n'):
line = line.strip()
m = re.match(r'(\d+)', line)
if m:
priority = int(m.group(1))
if line.startswith('release'):
bits = line.split(' ', 1)
if len(bits) > 1:
data.append( (priority, parse_policy_line(bits[1])) )
return data
def guess_release_from_apt(origin='Debian', component='main',
ignoresuites=('experimental'),
label='Debian'):
releases = parse_apt_policy()
if not releases:
return None
# We only care about the specified origin, component, and label
releases = [x for x in releases if (
x[1].get('origin', '') == origin and
x[1].get('component', '') == component and
x[1].get('label', '') == label)]
# Check again to make sure we didn't wipe out all of the releases
if not releases:
return None
releases.sort()
releases.reverse()
# We've sorted the list by descending priority, so the first entry should
# be the "main" release in use on the system
return releases[0][1]
def guess_debian_release():
distinfo = {'ID' : 'Debian'}
kern = os.uname()[0]
if kern in ('Linux', 'Hurd', 'NetBSD'):
distinfo['OS'] = 'GNU/'+kern
elif kern == 'FreeBSD':
distinfo['OS'] = 'GNU/k'+kern
else:
distinfo['OS'] = 'GNU'
distinfo['DESCRIPTION'] = '%(ID)s %(OS)s' % distinfo
if os.path.exists('/etc/debian_version'):
try:
release = open('/etc/debian_version').read().strip()
except IOError, msg:
print >> sys.stderr, 'Unable to open /etc/debian_version:', str(msg)
release = 'unknown'
if not release[0:1].isalpha():
# /etc/debian_version should be numeric
codename = lookup_codename(release, 'n/a')
distinfo.update({ 'RELEASE' : release, 'CODENAME' : codename })
elif release.endswith('/sid'):
if release.rstrip('/sid').lower().isalpha() != 'testing':
global TESTING_CODENAME
TESTING_CODENAME = release.rstrip('/sid')
distinfo['RELEASE'] = 'testing/unstable'
else:
distinfo['RELEASE'] = release
# Only use apt information if we did not get the proper information
# from /etc/debian_version or if we don't have a codename
# (which will happen if /etc/debian_version does not contain a
# number but some text like 'testing/unstable' or 'lenny/sid')
#
# This is slightly faster and less error prone in case the user
# has an entry in his /etc/apt/sources.list but has not actually
# upgraded the system.
rinfo = guess_release_from_apt()
if rinfo and not distinfo.get('CODENAME'):
release = rinfo.get('version')
if release:
codename = lookup_codename(release, 'n/a')
else:
release = rinfo.get('suite', 'unstable')
if release == 'testing':
# Would be nice if I didn't have to hardcode this.
codename = TESTING_CODENAME
else:
codename = 'sid'
distinfo.update({ 'RELEASE' : release, 'CODENAME' : codename })
if distinfo.get('RELEASE'):
distinfo['DESCRIPTION'] += ' %(RELEASE)s' % distinfo
if distinfo.get('CODENAME'):
distinfo['DESCRIPTION'] += ' (%(CODENAME)s)' % distinfo
return distinfo
# Whatever is guessed above can be overridden in /etc/lsb-release
def get_lsb_information():
distinfo = {}
if os.path.exists('/etc/lsb-release'):
try:
for line in open('/etc/lsb-release'):
line = line.strip()
if not line:
continue
# Skip invalid lines
if not '=' in line:
continue
var, arg = line.split('=', 1)
if var.startswith('DISTRIB_'):
var = var[8:]
if arg.startswith('"') and arg.endswith('"'):
arg = arg[1:-1]
if arg: # Ignore empty arguments
distinfo[var] = arg
except IOError, msg:
print >> sys.stderr, 'Unable to open /etc/lsb-release:', str(msg)
return distinfo
def get_distro_information():
lsbinfo = get_lsb_information()
# OS is only used inside guess_debian_release anyway
for key in ('ID', 'RELEASE', 'CODENAME', 'DESCRIPTION',):
if key not in lsbinfo:
distinfo = guess_debian_release()
distinfo.update(lsbinfo)
return distinfo
else:
return lsbinfo
def test():
print get_distro_information()
print check_modules_installed()
if __name__ == '__main__':
test()
