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# -*- coding: UTF-8 -*-

# Copyright © 2011 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.

from __future__ import with_statement

import logging

from os import environ, listdir, remove, rmdir

from os.path import dirname, exists, join, getsize, split

from subprocess import Popen, PIPE

from debpython.pydist import PUBLIC_DIR_RE

from debpython.tools import memoize, sitedir

log = logging.getLogger(__name__)

def parse(fpaths, other=None):

"""Parse namespace_packages.txt files."""

result = set(other or [])

for fpath in fpaths:

with open(fpath, 'r') as fp:

for line in fp:

if line:

result.add(line.strip())

return result

@memoize

def load(package=None):

"""Return a set of namespaces to regenerate/clean.

:param package: limit namespaces to the ones needed by given package

"""

fpaths = None

# DESTDIR is used in tests

nsdir = "%s/usr/share/python/ns/" % environ.get('DESTDIR', '')

if package:

# only one package is processed, no need to load all files

fpath = join(nsdir, package)

if exists(fpath):

fpaths = [fpath]

else:

# load all files

if exists(nsdir):

fpaths = [join(nsdir, i) for i in listdir(nsdir)]

if fpaths:

result = set(i.replace('.', '/') for i in parse(fpaths))

else:

result = set()

return result

def add_namespace_files(files, package=None, action=None):

"""Add __init__.py files to given generator."""

if action is not None:

namespaces = load(package)

already_processed = set()

removal_candidates = set()

for fn in files:

yield fn

if action is None:

continue

dpath = dirname(fn)

if dpath not in already_processed:

already_processed.add(dpath)

m = PUBLIC_DIR_RE.match(dpath)

if m:

public_dir = m.group()

while dpath != public_dir:

ns_dir = dpath[len(public_dir) + 1:]

if ns_dir in namespaces:

fpath = join(dpath, '__init__.py')

if action is True:

try:

open(fpath, 'a').close()

except Exception:

log.error('cannot create %s', fpath)

else:

yield fpath

else: # action is False

# postpone it due to dpkg -S call

removal_candidates.add(fpath)

already_processed.add(dpath)

dpath = split(dpath)[0]

# now deal with to-be-removed namespace candidates (dpkg -S is expensive)

# dpgk -S is used just to be safe (in case some other package is providing

# __init__.py file although it's in /usr/share/python/ns dir)

if action is False and removal_candidates:

process = Popen("/usr/bin/dpkg -S %s 2>/dev/null" % \

' '.join(removal_candidates), shell=True, stdout=PIPE)

# FIXME: len(search_string) > 131072

stdout, stderr = process.communicate()

for line in stdout.splitlines():

ns = line.split(': ', 1)[1]

if ns in removal_candidates:

removal_candidates.remove(ns)

for fpath in removal_candidates:

try:

remove(fpath)

except (IOError, OSError), e:

log.error('cannot remove %s', fpath)

log.debug(e)

else:

yield fpath

def remove_from_package(package, namespaces, versions):

"""Remove empty __init__.py files for requested namespaces."""

if not isinstance(namespaces, set):

namespaces = set(namespaces)

keep = set()

for ns in namespaces:

for version in versions:

fpath = join(sitedir(version, package), *ns.split('.'))

fpath = join(fpath, '__init__.py')

if not exists(fpath):

continue

if getsize(fpath) != 0:

log.warning('file not empty, cannot share %s namespace', ns)

keep.add(ns)

break

# return a set of namespaces that should be handled by pycompile/pyclean

result = namespaces - keep

# remove empty __init__.py files, if available

for ns in result:

for version in versions:

dpath = join(sitedir(version, package), *ns.split('.'))

fpath = join(dpath, '__init__.py')

if exists(fpath):

remove(fpath)

if not listdir(dpath):

rmdir(dpath)

# clean pyshared dir as well

dpath = join('debian', package, 'usr/share/pyshared', *ns.split('.'))

fpath = join(dpath, '__init__.py')

if exists(fpath):

remove(fpath)

if not listdir(dpath):

rmdir(dpath)

return result