tarfile module crash: Anyone else having this problem?

Coding Python Support
1

I am still plugging away at my python script installer/manager (http://blenderartists.org/forum/showthread.php?t=81748), but came across an interesting problem using the tarfile module. If tarfile.is_tarfile() or tarfile.open() is given an invalid tar file, Blender crashes.

I submitted a bug report here:
http://projects.blender.org/tracker/?func=detail&aid=5668&group_id=9&atid=125
even though I’m not really sure that this is Blender’s fault.

My question is, does the following script crash Blender for anyone besides me?

import tarfile
print tarfile.is_tarfile("blender.html")

If not, maybe the problem is just mine and I can go ahead and keep on using is_tarfile(), and just refrain from loading invalid tar files in my tests. Otherwise, it’d be nice to have help or a second opinion in resolving this issue.

Thanks!
Levi

2

does it crash if running in vanilla python?

3

Nope. That’s the strange part. I’m assuming that it doesn’t crash for you, either. Are you on Windows?

Edit: It appears that it’s not the tarfile module at all, but rather the bz2 module. The following is what blows up for me:

import bz2
f = bz2.BZ2File("blender.html")
print f.read() # Crash!

Levi

4

No help from me, just confirming the crash on:
Windows XP, blender 2.42a win 32 dynamic, python 2.4
Windows XP, blender cvs 21-12-2006 win32 dynamic, python 2.4

Following commands crash:
next()
read()
readline()
readlines()
seek()
Following do work:
close()
closed
mode
name
newlines
softspace
tell()
xreadlines() [no idea what the parameters should be, but it doesn’t crash]

Your first post about .is_tarfile() does crash as well.

5

Thanks Crouch! I was hoping it wasn’t just me. Then again, that means I’ll need to find a hack to get around it. Rats.

The reason the is_tarfile() and tarfile.open() crashes is because it tries to open the file using all three compression settings (raw, gzipped, and bz2). When it tries bz2 on a non-bz2 file … crash!

Levi