# Copyright 2010 Baptiste Lepilleur and The JsonCpp Authors
# Distributed under MIT license, or public domain if desired and
# recognized in your jurisdiction.
# See file LICENSE for detail or copy at http://jsoncpp.sourceforge.net/LICENSE

from contextlib import closing
import os
import tarfile

TARGZ_DEFAULT_COMPRESSION_LEVEL = 9

def make_tarball(tarball_path, sources, base_dir, prefix_dir=''):
 """Parameters:
 tarball_path: output path of the .tar.gz file
 sources: list of sources to include in the tarball, relative to the current directory
 base_dir: if a source file is in a sub-directory of base_dir, then base_dir is stripped
 from path in the tarball.
 prefix_dir: all files stored in the tarball be sub-directory of prefix_dir. Set to ''
 to make them child of root.
 """
 base_dir = os.path.normpath(os.path.abspath(base_dir))
 def archive_name(path):
 """Makes path relative to base_dir."""
 path = os.path.normpath(os.path.abspath(path))
 common_path = os.path.commonprefix((base_dir, path))
 archive_name = path[len(common_path):]
 if os.path.isabs(archive_name):
 archive_name = archive_name[1:]
 return os.path.join(prefix_dir, archive_name)
 def visit(tar, dirname, names):
 for name in names:
 path = os.path.join(dirname, name)
 if os.path.isfile(path):
 path_in_tar = archive_name(path)
 tar.add(path, path_in_tar)
 compression = TARGZ_DEFAULT_COMPRESSION_LEVEL
 with closing(tarfile.TarFile.open(tarball_path, 'w:gz',
 compresslevel=compression)) as tar:
 for source in sources:
 source_path = source
 if os.path.isdir(source):
 for dirpath, dirnames, filenames in os.walk(source_path):
 visit(tar, dirpath, filenames)
 else:
 path_in_tar = archive_name(source_path)
 tar.add(source_path, path_in_tar) # filename, arcname

def decompress(tarball_path, base_dir):
 """Decompress the gzipped tarball into directory base_dir.
 """
 with closing(tarfile.TarFile.open(tarball_path)) as tar:
 tar.extractall(base_dir)