Can't write to a directory made w/ os.makedirs

[David Goldsmith]

On Jan 1, 7:43 pm, MRAB <pyt... at mrabarnett.plus.com> wrote:
> On 02/01/2012 03:14, David Goldsmith wrote:
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> > On Jan 1, 7:05 am, Tim Golden<m... at timgolden.me.uk>  wrote:
> >>  On 01/01/2012 12:05, David Goldsmith wrote:
> >>    >>  ie can the Python process creating the directories,
>
> >>    >  Yes.
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> >>    >>  and a subprocess called from it create a simple file?
>
> >>    >  No.
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> >>    >>  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.
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> >>    >  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?
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> >>  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.
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> >>  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?
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> >>  TJG
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> > I'm a mathematician: the only thing I'm absolutely certain of is
> > nothing.
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> > 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)
>
> I think that if the command line should be something like:
>
> "C:\Program Files (x86)\aTunes\win_tools\flac.exe" -d
> --output-prefix=FOO\ BAR
>
> then the cmd should be something like:
>
> cmd = ['C:\\Program Files (x86)\\aTunes\\win_tools\\flac.exe', '-d',
> '--output-prefix="' + newD + '\\"', f]

Thanks again all!  MRAB: your advice was sufficient to get me over the
hump, so to speak, thanks for chiming in!