On 01/01/2012 10:14 PM, David Goldsmith wrote:
On Jan 1, 7:05 am, Tim Golden<m...@timgolden.me.uk> wrote:
On 01/01/2012 12:05, David Goldsmith wrote:
>> ie can the Python process creating the directories,
>
> Yes.
>
>> and a subprocess called from it create a simple file?
>
> No.
>
>> Depending on where you are in the filesystem, it may indeed
>> be necessary to be running as administrator. But don't try
>> to crack every security nut with an elevated sledgehammer.
>
> If you mean running as admin., those were my sentiments exactly. So,
> there isn't something specific I should be doing to assure that my
> subproceses can write to directories?
In the general case, no. By default, a subprocess will have
the same security context as its parent. The exception is
where the parent (the Python processing invoking subprocess.call
in this example) is already impersonating a different user;
in that case, the subprocess will inherit its grandparent's
context.
But unless you're doing something very deliberate here then
I doubt if that's biting you.
Can I ask: are you absolutely certain that the processes
you're calling are doing what you think they are and failing
where you think they're failing?
TJG
I'm a mathematician: the only thing I'm absolutely certain of is
nothing.
Here's my script, in case that helps:
import os
import sys
import stat
import os.path as op
import subprocess as sub
from os import remove
from os import listdir as ls
from os import makedirs as mkdir
def doFlac2Mp3(arg, d, fl):
if '.flac' in [f[-5:] for f in fl]:
newD = d.replace('FLACS', 'MP3s')
mkdir(newD)
for f in fl:
if f[-5:]=='.flac':
root = f.replace('.flac', '')
cmd = ['"C:\\Program Files (x86)\\aTunes\\win_tools\
\flac.exe" -d ' +
'--output-prefix=' + newD + '\\', f]
res = sub.call(cmd)#, env={'PATH': os.defpath})
if not res:
cmd = ['"C:\\Program Files (x86)\\aTunes\\win_tools
\\lame.exe" -h',
newD + root + '.wav', newD + root +
'.mp3']
res = sub.call(cmd)#, env={'PATH': os.defpath})
if not res:
rf = newD + root + '.wav'
remove(rf)
top=sys.argv[1]
op.walk(top, doFlac2Mp3, None)
The line cmd= is bogus. You're trying to run a program with a -h after
the filename. The reason you're passing a list to sub.call is to
separate the parameters from the program name, not to mention with
quotes in its name. So the -h has to be a separate list item.
(Although Windows will probably handle it correctly if you combine the
-h with the FOLLOWING argument, it's still bad practice]
cmd = [ "c:\\program files .... \\lame.exe", "-h", newD + root + ....."
--
DaveA
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