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import os
import tempfile
import tarfile
import bz2
class ArchivationError(Exception):
pass
class NoFilesArchivationError(ArchivationError):
pass
class ArchiveBaseClass(object):
"""Base class for archive classes."""
_compression = False
_ext = ".ext"
_mimetype = ""
def __init__(self, *args, **kwargs):
self._tar_ext = ".tar"
@property
def support_compression(self):
"""Return True if compression is supported/used."""
return self._compression
@property
def file_ext(self):
"""Return extension for output file."""
return self._ext
@property
def mimetype(self):
"""Return archive mime type."""
return self._mimetype
def _create_tmp_tar(self, filelist):
_, tmpfile = tempfile.mkstemp(suffix=self._tar_ext)
tar = tarfile.open(tmpfile, "w")
for name in filelist:
pieces = name.rsplit('/', 2)
arcname = "%s/%s" % (pieces[-2], pieces[-1])
tar.add(name, arcname=arcname)
tar.close()
return tmpfile
def create_archive(self, outfilename, filelist):
raise NotImplementedError()
class Bzip2Archive(ArchiveBaseClass):
"""Class for bzip2 compression."""
_compression = True
_ext = ".bz2"
_mimetype = "application/x-bzip2"
def __init__(self, usetar=True, *args, **kwargs):
ArchiveBaseClass.__init__(self, args, kwargs)
self.usetar = usetar
@property
def file_ext(self):
"""Return extension for output file."""
if self.usetar:
return "%s%s" % (self._tar_ext, self._ext)
return self._ext
def create_archive(self, outfilename, filelist):
"""Create compressed archive containing files listed in filelist."""
if not filelist:
raise NoFilesArchivationError("No files to archive.")
size = 0
for file in filelist:
size += os.path.getsize(file)
if size <= 0:
raise NoFilesArchivationError("No files to archive.")
if not self.usetar and len(filelist) > 1:
raise ArchivationError( \
"Bzip2 cannot archive multiple files without tar.")
if self.usetar:
f_in_path = self._create_tmp_tar(filelist)
else:
f_in_path = filelist[0]
f_in = open(f_in_path, 'rb')
f_out = bz2.BZ2File(outfilename, 'w')
f_out.writelines(f_in)
f_out.close()
f_in.close()
if self.usetar:
os.remove(f_in_path)
return outfilename
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