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Re: tarfile : read from a socket?

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From Peter Otten <__peter__@web.de>
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Subject Re: tarfile : read from a socket?
Date Thu, 11 Feb 2016 18:18:55 +0100
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Ulli Horlacher wrote:

> Ulli Horlacher <framstag@rus.uni-stuttgart.de> wrote:
> 
>> With
>> 
>>   taro = tarfile.open(fileobj=sock.makefile('w',kB64),mode='w|')
>> 
>> I get no more error.
> 
> Of course, this is the writing client.
> 
> Now I have a small problem with the reading client.
> 
> This code works so far:
> 
>   sfo = sock.makefile('r')
>   taro = tarfile.open(fileobj=sfo,mode='r|')
>   taro.extractall(path=edir)
> 
> But it does not writes anything to the terminal to inform the user.
> 
> When I use:
> 
>   for member in taro.getmembers():
>       print('extracting "%s"' % member.name)
>       taro.extract(member)
> 
> I get the error:
> 
>   File "/usr/lib/python2.7/tarfile.py", line 556, in seek
>     raise StreamError("seeking backwards is not allowed")
> 
> Of course, a stream is not seekable.
> 
> Any ideas?

A look into the source is often helpful ;)

$ cat extract_from_stream.py
import sys
from tarfile import TarFile

class MyTarFile(TarFile):
    def extract(self, member, path="."):
        print "extracting", member
        return TarFile.extract(self, member, path)

tf = MyTarFile.open(fileobj=sys.stdin, mode="r|")
tf.extractall()
$ touch foo bar
$ tar -cf archive.tar foo bar
$ python extract_from_stream.py < archive.tar 
extracting <TarInfo 'foo' at 0x7f2b3f394890>
extracting <TarInfo 'bar' at 0x7f2b3f3a4bd0>

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tarfile : read from a socket? Ulli Horlacher <framstag@rus.uni-stuttgart.de> - 2016-02-11 08:31 +0000
  Re: tarfile : read from a socket? INADA Naoki <songofacandy@gmail.com> - 2016-02-11 19:26 +0900
  Re: tarfile : read from a socket? Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2016-02-11 11:47 +0100
    Re: tarfile : read from a socket? Ulli Horlacher <framstag@rus.uni-stuttgart.de> - 2016-02-11 12:53 +0000
      Re: tarfile : read from a socket? MRAB <python@mrabarnett.plus.com> - 2016-02-11 13:16 +0000
      Re: tarfile : read from a socket? Chris Angelico <rosuav@gmail.com> - 2016-02-12 00:18 +1100
        Re: tarfile : read from a socket? Ulli Horlacher <framstag@rus.uni-stuttgart.de> - 2016-02-11 13:34 +0000
      Re: tarfile : read from a socket? Ulli Horlacher <framstag@rus.uni-stuttgart.de> - 2016-02-11 13:25 +0000
        Re: tarfile : read from a socket? Ulli Horlacher <framstag@rus.uni-stuttgart.de> - 2016-02-11 16:41 +0000
          Re: tarfile : read from a socket? MRAB <python@mrabarnett.plus.com> - 2016-02-11 17:10 +0000
          modifying a standard module? (was: Re: tarfile : read from a socket?) Ulli Horlacher <framstag@rus.uni-stuttgart.de> - 2016-02-11 17:10 +0000
            Re: modifying a standard module? (was: Re: tarfile : read from a socket?) Matt Wheeler <m@funkyhat.org> - 2016-02-12 20:53 +0000
              Re: modifying a standard module? Ulli Horlacher <framstag@rus.uni-stuttgart.de> - 2016-02-12 22:46 +0000
                Re: modifying a standard module? Paul Rubin <no.email@nospam.invalid> - 2016-02-12 16:21 -0800
          Re: tarfile : read from a socket? Peter Otten <__peter__@web.de> - 2016-02-11 18:18 +0100
          Re: tarfile : read from a socket? Lars Gustäbel <lars@gustaebel.de> - 2016-02-11 18:27 +0100
          Re: tarfile : read from a socket? Random832 <random832@fastmail.com> - 2016-02-11 16:23 -0500
          Re: tarfile : read from a socket? Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2016-02-12 09:35 +0100
          Re: tarfile : read from a socket? Lars Gustäbel <lars@gustaebel.de> - 2016-02-12 09:40 +0100
            Re: tarfile : read from a socket? Ulli Horlacher <framstag@rus.uni-stuttgart.de> - 2016-02-12 12:48 +0000

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