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Date: Fri, 04 May 2007 13:54:28 -0400
From: Jason Tishler <jason@tishler.net>
Subject: Re: popen problems
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Dan,

On Fri, May 04, 2007 at 09:36:23AM -0500, Dan Armbrust wrote:
> [snip]
> >>>import os.path
> >>>os.popen('ls').readline()
> Traceback (most recent call last):
>  File "<stdin>", line 1, in ?
> OSError: [Errno 13] Permission denied
> 
> What on earth happened?

The above indicates that /bin/sh.exe is not executable.  I can reproduce
the problem with the following:

    $ python -c 'import os; os.popen("ls").readline()' # works
    $ chmod -x /bin/sh.exe
    $ python -c 'import os; os.popen("ls").readline()' # doesn't work
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
    OSError: [Errno 13] Permission denied
    $ chmod +x /bin/sh.exe
    $ python -c 'import os; os.popen("ls").readline()' # works again
    $

> Any idea how I can fix this?

Make your Cygwin executables and DLLs executable.  You may have to use
Windows tools, if chmod is not executable...

Jason

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