tarfile with socket incompatability

[AlexLeach]

BPO	11458
Nosy	@bitdancer
Files	unnamed

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2011-03-10.03:46:01.692>
created_at = <Date 2011-03-10.02:33:59.354>
labels = ['extension-modules']
title = 'tarfile with socket incompatability'
updated_at = <Date 2011-03-10.09:59:09.989>
user = 'https://bugs.python.org/AlexLeach'

bugs.python.org fields:

activity = <Date 2011-03-10.09:59:09.989>
actor = 'Alex.Leach'
assignee = 'none'
closed = True
closed_date = <Date 2011-03-10.03:46:01.692>
closer = 'r.david.murray'
components = ['Extension Modules']
creation = <Date 2011-03-10.02:33:59.354>
creator = 'Alex.Leach'
dependencies = []
files = ['21069']
hgrepos = []
issue_num = 11458
keywords = []
message_count = 3.0
messages = ['130482', '130486', '130496']
nosy_count = 2.0
nosy_names = ['r.david.murray', 'Alex.Leach']
pr_nums = []
priority = 'normal'
resolution = 'works for me'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue11458'
versions = []

[AlexLeach]

Hi,

I'm trying to parse the contents of tar archives (.tgz) on the fly, and failing to do so. The tar archives in question have directory hierarchies, and only if a TarInfo object is a file (.isreg() ) will I try and read it's contents.

I figured a sensible idea would be to pass a socket(.makefile()) object to the fileobj attribute of tarfile.open. This doesn't work because a socket file descriptor does not have a tell() method. I understand that a socket object shouldn't need to have a tell method, but why should the fileobj passed to tarfile.open need it?

Code:-

def get_headers( self, file_name ):
    sock = socket.socket()
    sock.bind(('localhost',0))
    fd = sock.makefile()
    handle = tarfile.open( file_name,'r',fileobj=fd ) # This line breaks

I'm currently testing on Python v2.6.6 EPD 6.3-2 64 bit, on an Autumn 2010 Mac Pro.

My dirty bug-fix idea is to subclass tarfile.TarFile, and give it a tell() method, to just return 0. I don't want to have to do that. Any alternative suggestions would be greatly appreciated.

Cheers,
Alex

[bitdancer]

I believe you are looking for mode 'r|'.

[AlexLeach]

Thanks! =D

On Thu, Mar 10, 2011 at 3:46 AM, R. David Murray <report@bugs.python.org>wrote:

R. David Murray <rdmurray@bitdance.com> added the comment:

I believe you are looking for mode 'r|'.

----------
nosy: +r.david.murray
resolution: -> works for me
stage: -> committed/rejected
status: open -> closed

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