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# -*- coding: utf-8 -*-
"""
g_octave.description
~~~~~~~~~~~~~~~~~~~~
This module implements a Python object with the content of a given
DESCRIPTION file.
DESCRIPTION files are basically key/value files with multi-line support.
The separator is a ':'.
:copyright: (c) 2009-2010 by Rafael Goncalves Martins
:license: GPL-2, see LICENSE for more details.
"""
from __future__ import absolute_import
__all__ = [
'Description',
'SvnDescription',
're_depends',
're_pkg_atom'
]
import os
import re
import shutil
import tempfile
from contextlib import closing
from .config import Config
from .compat import py3k
from .checksum import sha1_compute
from .exception import DescriptionException
from .info import Info
if py3k:
import urllib.request as urllib
else:
import urllib2 as urllib
from .log import Log
log = Log('g_octave.description')
conf = Config()
# octave-forge DESCRIPTION's dependencies atoms
re_depends = re.compile(r'^([a-zA-Z0-9-]+) *(\( *([><=]?=?) *([0-9.]+) *\))?')
# we'll use atoms like 'control-1.0.11' for g-octave packages
re_pkg_atom = re.compile(r'^(.+)-([0-9.]+)$')
class Description(object):
def __init__(self, file, parse_sysreq=True):
log.info('Parsing file: %s' % file)
if not os.path.exists(file):
log.error('File not found: %s' % file)
raise DescriptionException('File not found: %s' % file)
self._file = file
self._info = Info(os.path.join(conf.db, 'info.json'))
# dictionary with the parsed content of the DESCRIPTION file
self._desc = dict()
# current key
key = None
with open(file, 'rb') as fp:
for line in fp:
line = line.decode('iso-8859-15')
line_splited = line.split(':')
# 'key: value' found?
if len(line_splited) >= 2:
# by default we have a key before the first ':'
key = line_splited[0].strip().lower()
# all the stuff after the first ':' is the value
# ':' included.
value = ':'.join(line_splited[1:]).strip()
# the key already exists?
if key in self._desc:
# it's one of the dependencies?
if key in ('depends', 'systemrequirements', 'buildrequires'):
# use ', ' to separate the values
self._desc[key] += ', '
else:
# use a single space to separate the values
self._desc[key] += ' '
# key didn't exists yet. initializing...
else:
self._desc[key] = ''
self._desc[key] += value
# it's not a 'key: value', so it's probably a continuation
# of the previous line.
else:
# empty line
if len(line) == 0:
continue
# comments (started with '#')
if line[0] == '#':
continue
# line continuations starts with a single space
if line[0] != ' ':
continue
# the first line can't be a continuation, obviously :)
if key is None:
continue
# our line already have a single space at the start.
# we only needs strip spaces at the end of the line
self._desc[key] += line.rstrip()
# add the 'self_depends' key
self._desc['self_depends'] = list()
# add the 'gentoo_license' key
self._desc['license_gentoo'] = ''
# parse the dependencies and license
for key in self._desc:
# depends
if key == 'depends':
depends = self._desc[key]
self._desc[key] = self._parse_depends(depends)
self._desc['self_depends'] = self._parse_self_depends(depends)
# requirements
if key in ('systemrequirements', 'buildrequires') and parse_sysreq:
self._desc[key] = self._parse_depends(self._desc[key])
# license
if key == 'license':
try:
new_license = self._info.licenses.get(self._desc['license'])
except:
new_license = ''
if new_license not in [None, '']:
self._desc['license_gentoo'] = new_license
else:
self._desc['license_gentoo'] = self._desc['license']
def _parse_depends(self, depends):
"""returns a list with gentoo atoms for the 'depends' (the other
octave-forge packages or the octave itself)
"""
# the list that will be returned
depends_list = list()
for depend in depends.split(','):
# use the 're_depends' regular expression to filter the
# package name, the version an the comparator
re_match = re_depends.match(depend.strip())
# the depend is valid?
if re_match is not None:
# initialize the atom string empty
atom = ''
# extract the needed values
name = re_match.group(1)
comparator = re_match.group(3)
version = re_match.group(4)
# we have a comparator and a version?
if comparator is not None and version is not None:
# special case: '==' for octave forge is '=' for gentoo
if comparator == '==':
atom += '='
else:
atom += comparator
# as octave is already in the portage tree, the atom is
# predefined.
if name.lower() == 'octave':
atom += 'sci-mathematics/octave'
elif name in self._info.dependencies:
if self._info.dependencies[name] == '':
continue
atom += self._info.dependencies[name]
# the octave-forge packages will be put inside a "fake"
# category: g-octave
else:
atom += 'g-octave/' + str(name)
# append the version to the atom, if needed
if comparator is not None and version is not None:
atom += '-' + str(version)
depends_list.append(atom)
# invalid dependency atom
else:
log.error('Invalid dependency atom: %s' % depend)
raise DescriptionException('Invalid dependency atom: %s' % depend)
return list(set(depends_list))
def _parse_self_depends(self, depends):
"""returns a list of tuples (name, comparator, version) for the
other octave-forge packages.
"""
# the list that will be returned
depends_list = list()
for depend in depends.split(','):
# use the 're_depends' regular expression to filter the
# package name, the version an the comparator
re_match = re_depends.match(depend.strip())
# the depend is valid?
if re_match is not None:
# extract the needed values
name = re_match.group(1)
comparator = re_match.group(3)
version = re_match.group(4)
# we need only the octave-forge packages, nor octave
if name.lower() != 'octave':
depends_list.append((name, comparator, version))
# invalid dependency atom
else:
log.error('Invalid dependency atom: %s' % depend)
raise DescriptionException('Invalid dependency atom: %s' % depend)
return depends_list
def sha1sum(self):
return sha1_compute(self._file)
def __getattr__(self, name):
"""method that overloads the object atributes, returning the needed
atribute based on the dict with the previously parsed content.
"""
return self._desc.get(name, None)
class SvnDescription(Description):
_url = 'https://octave.svn.sourceforge.net/svnroot/octave/trunk/octave-forge'
def __init__(self, category, package):
temp_desc = config_file = tempfile.mkstemp()[1]
desc_url = '%s/%s/%s/DESCRIPTION' % (
self._url,
category,
package,
)
try:
with closing(urllib.urlopen(desc_url)) as fp:
with open(temp_desc, 'wb') as fp_:
shutil.copyfileobj(fp, fp_)
except:
raise DescriptionException('Failed to fetch DESCRIPTION file from SVN')
Description.__init__(self, temp_desc)
os.unlink(temp_desc)
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