popen pipes fail when cwd is a UNC path

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  • Tim Black
    #1

    popen pipes fail when cwd is a UNC path

    In my recent experience, popen os pipes always fail when cwd is a UNC
    path. Can anyone shed any light on this? Although I've seen lots of
    UNC path-related problems in this newsgroup, I've not been able to
    find anything specifically about os pipes and UNC paths.

    Here's a session dump that demonstrates what I'm talking about:

    Python 2.3.4 (#53, May 25 2004, 21:17:02) [MSC v.1200 32 bit (Intel)]
    on win32
    Type "help", "copyright" , "credits" or "license" for more information.[color=blue][color=green][color=darkred]
    >>> os.getcwd()[/color][/color][/color]
    'c:\\Python23'[color=blue][color=green][color=darkred]
    >>> f=os.popen("dir "); r=f.read(); print f.close()[/color][/color][/color]
    None[color=blue][color=green][color=darkred]
    >>> os.getcwd()[/color][/color][/color]
    'c:\\Python23'[color=blue][color=green][color=darkred]
    >>> os.chdir("c:\\" )
    >>> os.getcwd()[/color][/color][/color]
    'c:\\'[color=blue][color=green][color=darkred]
    >>> f=os.popen("dir "); r=f.read(); print f.close()[/color][/color][/color]
    None[color=blue][color=green][color=darkred]
    >>> os.chdir("\\\\T imb\\Python23")
    >>> os.getcwd()[/color][/color][/color]
    '\\\\Timb\\Pyth on23'[color=blue][color=green][color=darkred]
    >>> f=os.popen("dir "); r=f.read(); print f.close()[/color][/color][/color]
    1

    As you can see, this last pipe fails. This only happens when cwd is a
    UNC path. Please let me know if you have seen this, solved this, know
    a nice workaround, etc. as I find this quite annoying.

    Thanks,
    Tim
    Tags: None
    • Mark Hadfield
      #2
      Re: popen pipes fail when cwd is a UNC path

      Tim Black wrote:[color=blue]
      > In my recent experience, popen os pipes always fail when cwd is a UNC
      > path. Can anyone shed any light on this? Although I've seen lots of
      > UNC path-related problems in this newsgroup, I've not been able to
      > find anything specifically about os pipes and UNC paths.[/color]

      It's a problem with the Windows command interpreter (cmd.exe on the NT
      family) which gets invoked by popen. To demonstrate this. try cd'ing to
      a UNC path. You will get a message like

      '\\foo\bar' is an invalid current directory path. UNC paths are not
      supported.


      --
      Mark Hadfield "Ka puwaha te tai nei, Hoea tatou"
      m.hadfield@niwa .co.nz
      National Institute for Water and Atmospheric Research (NIWA)

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        • Steve Christensen
          #3
          Re: popen pipes fail when cwd is a UNC path

          In article <cho314$4e1$1@n ewsreader.mailg ate.org>, Mark Hadfield wrote:[color=blue]
          > Tim Black wrote:[color=green]
          >> In my recent experience, popen os pipes always fail when cwd is a UNC
          >> path. Can anyone shed any light on this? Although I've seen lots of
          >> UNC path-related problems in this newsgroup, I've not been able to
          >> find anything specifically about os pipes and UNC paths.[/color]
          >
          > It's a problem with the Windows command interpreter (cmd.exe on the NT
          > family) which gets invoked by popen. To demonstrate this. try cd'ing to
          > a UNC path. You will get a message like
          >
          > '\\foo\bar' is an invalid current directory path. UNC paths are not
          > supported.[/color]

          It won't be directly applicable to the original problem... But, you can
          use 'pushd' on a UNC path. It will temporarily map the UNC path to a
          drive letter. When you do a 'popd' it will unmap the drive letter.

          -Steve

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