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#!/usr/bin/python
# -*- coding: utf-8 -*-
#################################################################################
# LAYMAN TAR OVERLAY HANDLER
#################################################################################
# File: tar.py
#
# Handles tar overlays
#
# Copyright:
# (c) 2005 - 2008 Gunnar Wrobel
# Distributed under the terms of the GNU General Public License v2
#
# Author(s):
# Gunnar Wrobel <wrobel@gentoo.org>
#
''' Tar overlay support.'''
__version__ = "$Id: tar.py 310 2007-04-09 16:30:40Z wrobel $"
#===============================================================================
#
# Dependencies
#
#-------------------------------------------------------------------------------
import os, os.path, sys, urllib2, shutil, tempfile
import xml.etree.ElementTree as ET # Python 2.5
from layman.utils import path, ensure_unicode
#from layman.debug import OUT
from layman.overlays.source import OverlaySource, require_supported
#===============================================================================
#
# Class TarOverlay
#
#-------------------------------------------------------------------------------
class TarOverlay(OverlaySource):
''' Handles tar overlays.
>>> from layman.debug import OUT
>>> import xml.etree.ElementTree as ET # Python 2.5
>>> repo = ET.Element('repo')
>>> repo_name = ET.Element('name')
>>> repo_name.text = 'dummy'
>>> desc = ET.Element('description')
>>> desc.text = 'Dummy description'
>>> owner = ET.Element('owner')
>>> owner_email = ET.Element('email')
>>> owner_email.text = 'dummy@example.org'
>>> owner[:] = [owner_email]
>>> source = ET.Element('source', type='tar')
>>> here = os.path.dirname(os.path.realpath(__file__))
>>> source.text = 'file://' + here + '/../tests/testfiles/layman-test.tar.bz2'
>>> subpath = ET.Element('subpath')
>>> subpath.text = 'layman-test'
>>> repo[:] = [repo_name, desc, owner, source, subpath]
>>> config = {'tar_command':'/bin/tar'}
>>> testdir = os.tmpnam()
>>> os.mkdir(testdir)
>>> from layman.overlays.overlay import Overlay
>>> a = Overlay(repo, config, quiet=False)
>>> OUT.color_off()
>>> a.add(testdir) #doctest: +ELLIPSIS
* Running... # /bin/tar -v -x -f...
>>> sorted(os.listdir(testdir + '/dummy'))
['app-admin', 'app-portage']
>>> shutil.rmtree(testdir)
'''
type = 'Tar'
type_key = 'tar'
def __init__(self, parent, xml, config, _location, ignore = 0, quiet = False):
super(TarOverlay, self).__init__(parent, xml, config, _location, ignore, quiet)
_subpath = xml.find('subpath')
if _subpath != None:
self.subpath = ensure_unicode(_subpath.text.strip())
elif 'subpath' in xml.attrib:
self.subpath = ensure_unicode(xml.attrib['subpath'])
else:
self.subpath = ''
self.output = config['output']
def __eq__(self, other):
res = super(TarOverlay, self).__eq__(other) \
and self.subpath == other.subpath
return res
def __ne__(self, other):
return not self.__eq__(other)
# overrider
def to_xml_hook(self, repo_elem):
if self.subpath:
_subpath = ET.Element('subpath')
_subpath.text = self.subpath
repo_elem.append(_subpath)
del _subpath
def _extract(self, base, tar_url, dest_dir):
ext = '.tar.noidea'
for i in [('tar.%s' % e) for e in ('bz2', 'gz', 'lzma', 'xz', 'Z')] \
+ ['tgz', 'tbz', 'taz', 'tlz', 'txz']:
candidate_ext = '.%s' % i
if self.src.endswith(candidate_ext):
ext = candidate_ext
break
try:
tar = urllib2.urlopen(tar_url).read()
except Exception, error:
raise Exception('Failed to fetch the tar package from: '
+ self.src + '\nError was:' + str(error))
pkg = path([base, self.parent.name + ext])
try:
out_file = open(pkg, 'w')
out_file.write(tar)
out_file.close()
except Exception, error:
raise Exception('Failed to store tar package in '
+ pkg + '\nError was:' + str(error))
# tar -v -x -f SOURCE -C TARGET
args = ['-v', '-x', '-f', pkg, '-C', dest_dir]
result = self.run_command(self.command(), *args, cmd=self.type)
os.unlink(pkg)
return result
def _add_unchecked(self, base, quiet):
def try_to_wipe(folder):
if not os.path.exists(folder):
return
try:
self.output.info('Deleting directory "%s"' % folder, 2)
shutil.rmtree(folder)
except Exception, error:
raise Exception('Failed to remove unnecessary tar structure "'
+ folder + '"\nError was:' + str(error))
final_path = path([base, self.parent.name])
temp_path = tempfile.mkdtemp(dir=base)
try:
result = self._extract(base=base, tar_url=self.src,
dest_dir=temp_path)
except Exception, error:
try_to_wipe(temp_path)
raise error
if result == 0:
if self.subpath:
source = temp_path + '/' + self.subpath
else:
source = temp_path
if os.path.exists(source):
if os.path.exists(final_path):
self.delete(base)
try:
os.rename(source, final_path)
except Exception, error:
raise Exception('Failed to rename tar subdirectory ' +
source + ' to ' + final_path +
'\nError was:' + str(error))
os.chmod(final_path, 0755)
else:
raise Exception('Given subpath "' + source + '" does not exist '
' in the tar package!')
try_to_wipe(temp_path)
return result
def add(self, base, quiet = False):
'''Add overlay.'''
self.supported()
target = path([base, self.parent.name])
if os.path.exists(target):
raise Exception('Directory ' + target + ' already exists.' +\
' Will not overwrite its contents!')
return self.postsync(
self._add_unchecked(base, quiet),
cwd=target)
def sync(self, base, quiet = False):
'''Sync overlay.'''
self.supported()
target = path([base, self.parent.name])
return self.postsync(
self._add_unchecked(base, quiet),
cwd=target)
def supported(self):
'''Overlay type supported?'''
return require_supported([(self.command(), 'tar', 'app-arch/tar'), ])
if __name__ == '__main__':
import doctest
# Ignore warnings here. We are just testing
from warnings import filterwarnings, resetwarnings
filterwarnings('ignore')
doctest.testmod(sys.modules[__name__])
resetwarnings()
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