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# Copyright (C) 2011 Codethink Limited
#
# This program 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 of the License.
#
# This program 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 program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
'''Functions for dealing with Baserock binaries.
Binaries are chunks, strata, and system images.
'''
import logging
import os
import re
import tarfile
import morphlib
def create_chunk(rootdir, chunk_filename, regexps):
'''Create a chunk from the contents of a directory.
Only files and directories that match at least one of the regular
expressions are accepted. The regular expressions are implicitly
anchored to the beginning of the string, but not the end. The
filenames are relative to rootdir.
'''
def mkrel(filename):
assert filename.startswith(rootdir)
if filename == rootdir:
return '.'
assert filename.startswith(rootdir + '/')
return filename[len(rootdir + '/'):]
def matches(filename):
return any(x.match(filename) for x in compiled)
def names_to_root(filename):
yield filename
while filename != rootdir:
filename = os.path.dirname(filename)
yield filename
logging.debug('Creating chunk file %s from %s with regexps %s' %
(chunk_filename, rootdir, regexps))
compiled = [re.compile(x) for x in regexps]
include = set()
for dirname, subdirs, basenames in os.walk(rootdir):
if matches(dirname):
include.add(dirname)
filenames = [os.path.join(dirname, x) for x in basenames]
for filename in filenames:
if matches(mkrel(filename)):
for name in names_to_root(filename):
include.add(name)
include = sorted(include)
tar = tarfile.open(name=chunk_filename, mode='w:gz')
for filename in include:
tar.add(filename, arcname=mkrel(filename), recursive=False)
tar.close()
include.remove(rootdir)
for filename in reversed(include):
if os.path.isdir(filename):
if not os.listdir(filename):
os.rmdir(filename)
else:
os.remove(filename)
def unpack_chunk(chunk_filename, dirname):
'''Unpack a chunk into a directory.
The directory must exist already.
'''
logging.debug('Unpacking chunk %s into %s' % (chunk_filename, dirname))
tar = tarfile.open(name=chunk_filename)
tar.extractall(path=dirname)
tar.close()
def create_stratum(rootdir, stratum_filename):
'''Create a stratum from the contents of a directory.'''
logging.debug('Creating stratum file %s from %s' %
(stratum_filename, rootdir))
tar = tarfile.open(name=stratum_filename, mode='w:gz')
tar.add(rootdir, arcname='.')
tar.close()
def unpack_stratum(stratum_filename, dirname):
'''Unpack a stratum into a directory.
The directory must exist already.
'''
logging.debug('Unpacking stratum %s into %s' % (stratum_filename, dirname))
tar = tarfile.open(name=stratum_filename)
tar.extractall(path=dirname)
tar.close()
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