Converting ZIP archives to TAR archives

# File: zip2tar.py
#
# Convert ZIP archive to TAR.GZ archive.
#
# Written by Fredrik Lundh, March 2005.

# helpers (tweak as necessary)

def getuser():
    # return user name and user id
    return "anonymous", 1000

def getmode(name, data):
    # return mode ("b" or "t") for the given file.
    # you can do this either by inspecting the name, or
    # the actual data (e.g. by looking for non-ascii, non-
    # line-feed data).
    return "t" # assume everything's text, for now

#
# main

import tarfile
import zipfile

import glob, os, StringIO, sys, time

now = time.time()

user = getuser()

def fixup(infile):

    file, ext = os.path.splitext(infile)

    outfile = file + ".tar.gz"
    dirname = os.path.basename(file)

    print outfile

    zip = zipfile.ZipFile(infile, "r")

    tar = tarfile.open(outfile, "w:gz")
    tar.posix = 1

    for name in zip.namelist():

        if name.endswith("/"):
            continue

        data = zip.read(name)
        if getmode(name, data) == "t":
            data = data.replace("\r\n", "\n")

        tarinfo = tarfile.TarInfo()
        tarinfo.name = name
        tarinfo.size = len(data)
        tarinfo.mtime = now
        tarinfo.uname = tarinfo.gname = user[0]
        tarinfo.uid = tarinfo.gid = user[1]
        tar.addfile(tarinfo, StringIO.StringIO(data))

    tar.close()
    zip.close()

# convert all ZIP files in the current directory
for file in glob.glob("*.zip"):
    fixup(file)