[issue9699] invalid call of Windows API _popen() generating The input line is too long error message

[Mark Lawrence]

Change by Mark Lawrence :


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nosy:  -BreamoreBoy

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[issue9699] invalid call of Windows API _popen() generating The input line is too long error message

[Mark Lawrence]

Mark Lawrence added the comment:

@Tim can you pick this up?

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nosy: +BreamoreBoy
versions: +Python 3.4, Python 3.5 -Python 3.2

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[issue9699] invalid call of Windows API _popen() generating The input line is too long error message

[Brian Curtin]

Changes by Brian Curtin br...@python.org:


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[issue9699] invalid call of Windows API _popen() generating The input line is too long error message

[Terry J. Reedy]

Changes by Terry J. Reedy tjre...@udel.edu:


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versions:  -Python 2.5, Python 2.6, Python 3.1

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[issue9699] invalid call of Windows API _popen() generating The input line is too long error message

[sorin]

sorin sorin.sbar...@gmail.com added the comment:

I made a small but important update to quote_command(), now it does quote the 
command line only under Windows because doing this under other platforms may 
break the command line.

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[issue9699] invalid call of Windows API _popen() generating The input line is too long error message

[sorin]

New submission from sorin sorin.sbar...@gmail.com:

Behavior: you get The input line is too long. error message when you try to 
run an external process by using os.system(), subprocess.Popen() or other 
similar methods.

The real command line limit is 8192 under Windows and in most cases (if not 
all) the cause for getting this message is not the length.

The real cause is that if you even have a quote inside your command line you 
need to include the entire command in quote.

Here are some details:
http://stackoverflow.com/questions/682799/what-to-do-with-the-input-line-is-too-long-error-message/3583282#3583282
http://msdn.microsoft.com/en-us/library/96ayss4b.aspx (see comment)

Even if this is caused by a bug on Windows that is present for more than ten 
years I think Python needs to workaround it by adding the quotes when they are 
needed.

This will prevent other developers from writing OS specific code in their 
Python programs in order to workaround this bug.

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components: Windows
messages: 115062
nosy: sorin
priority: normal
severity: normal
status: open
title: invalid call of Windows API _popen() generating The input line is too 
long error message
type: behavior
versions: Python 2.5, Python 2.6, Python 2.7, Python 3.1, Python 3.2, Python 3.3

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[issue9699] invalid call of Windows API _popen() generating The input line is too long error message

[R. David Murray]

R. David Murray rdmur...@bitdance.com added the comment:

Python does not call _popen, though it does call cmd.exe (through 
CreateProcess) when shell=True in subprocess.  Can you provide an example that 
shows this error occurring?

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versions:  -Python 2.5, Python 3.3

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[issue9699] invalid call of Windows API _popen() generating The input line is too long error message

[sorin]

sorin sorin.sbar...@gmail.com added the comment:

I'm currently building some samples (one that could be run on any Windows 
machine).

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[issue9699] invalid call of Windows API _popen() generating The input line is too long error message

[sorin]

sorin sorin.sbar...@gmail.com added the comment:

Here is a test file. It does contain 3 command lines that are similar but one 
of them is not working (cmd_2).

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Added file: http://bugs.python.org/file18662/bug_line_too_long.py

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[issue9699] invalid call of Windows API _popen() generating The input line is too long error message

[sorin]

sorin sorin.sbar...@gmail.com added the comment:

True about tee, I forgot to remove it. By the way, in case the other patch does 
not solve the issue we can use the quote_command() from 
http://github.com/ssbarnea/tendo/blob/master/tendo/tee.py to solve it.

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[issue9699] invalid call of Windows API _popen() generating The input line is too long error message

[R. David Murray]

R. David Murray rdmur...@bitdance.com added the comment:

Thanks, sorin.  This issue is at least affected by the fix to issue 2304.  I 
don't currently have an up-to-date version of 2.7 trunk on my windows VM, so I 
can't test your code there.  (Note that 'import tee' needs to be removed before 
your test program will run.)  Adding Tim and Brian to nosy so they can check it 
out.  It is quite possible (even likely) that 2304 fixed this problem as well.

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[issue9699] invalid call of Windows API _popen() generating The input line is too long error message

[Tim Golden]

Changes by Tim Golden m...@timgolden.me.uk:


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[issue9699] invalid call of Windows API _popen() generating The input line is too long error message

[Tim Golden]

Tim Golden m...@timgolden.me.uk added the comment:

I'll pick this up and try to decide what's best to
do. I'm away from home for a few weeks and have only
intermittent internet access. Thanks, Sorin, for
a reproducible test case.

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title: invalid call of Windows API _popen() generating The input line is too 
long error message - invalid call of Windows API _popen() generating The input 
   line is too long error message

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