My first real request for help

Gene Heskett gheskett at wdtv.com
Tue Nov 19 17:19:26 CET 2013


On Tuesday 19 November 2013 11:16:10 Peter Otten did opine:

> Gene Heskett wrote:
> > Old python, 2.6.4 I believe, not update able from the Ubuntu 10.04.3
> > LTS repo's.
> > 
> > Should be a mauchs nichs as the code was written on, and is running
> > on, several of these same linuxcnc installs.
> > 
> > But when I switch in, as one of the plugins a new .py version of
> > camview- emc, I get this when I attempt to run linuxcnc -l, where the
> > -l is "use the same config as last time" option.
> > 
> > Starting LinuxCNC...
> > 
> > Traceback (most recent call last):
> >   File "/usr/bin/axis", line 3326, in <module>
> >   
> >     _dynamic_tabs(inifile)
> >   
> >   File "/usr/bin/axis", line 3182, in _dynamic_tabs
> >   
> >     child = Popen(cmd)
> >   
> >   File "/usr/lib/python2.6/subprocess.py", line 633, in __init__
> >   
> >     errread, errwrite)
> >   
> >   File "/usr/lib/python2.6/subprocess.py", line 1139, in
> >   _execute_child
> >   
> >     raise child_exception
> > 
> > OSError: [Errno 2] No such file or directory
> > 
> > No clue, even when straced, as to what file might be missing.
> > 
> > So, how do I find out?
> 
> How about inserting a
> 
> print cmd
> 
> before the line
> 
> child = Popen(cmd)
> 
> ? Depending on its value it may not even be a missing command, e. g.
> This doesn't work:
> 
> Python 2.6.7 (r267:88850, Sep 28 2012, 16:26:39)
> [GCC 4.6.1] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
> 
> >>> import subprocess
> >>> subprocess.Popen("ls -1")
> 
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "/usr/lib/python2.6/subprocess.py", line 623, in __init__
>     errread, errwrite)
>   File "/usr/lib/python2.6/subprocess.py", line 1141, in _execute_child
>     raise child_exception
> OSError: [Errno 2] No such file or directory
> 
> But this works:
> >>> subprocess.Popen(["ls", "-1"])
> 
> <subprocess.Popen object at 0x7f8b31c5cfd0>
> 
> >>> alpha
> 
> beta
> gamma
> 
> And this works, too (but is a bit less robust):
> 
> subprocess.Popen("ls -1", shell=True)
> <subprocess.Popen object at 0x7f8b31c5cd90>
> 
> >>> alpha
> 
> beta
> gamma

You are suggesting I edit /usr/lib/python2.6/subprocess.py?

Thanks.

Cheers, Gene
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)

I have great faith in fools -- self confidence my friends call it.
		-- Edgar Allan Poe
A pen in the hand of this president is far more
dangerous than 200 million guns in the hands of
         law-abiding citizens.



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