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I'm attempting to write a script that will gather the output of a few basic windows commands into a set of files, and am finding my vssadmin commands frustrating. The command is a relatively simple 

os.system('vssadmin list writers>> x:\foo\vss.txt')

The problem is that I'm writing in python 32-bit and want to make sure this will function on 64-bit Windows. When executing this, the return is:

vssadmin 1.1 - Volume Shadow Copy Service administrative command-line tool (C) Copyright 2001-2005 Microsoft Corp.

Error: A Volume Shadow Copy Service component encountered an unexpected error. Check the Application event log for more information.

Can I invoke a 64-bit command line from 32-bit python and decide whether to invoke it with a bit-depth detecting function, or is there another more elegant solution?

Follow-up: using MBu as a jumping off point I found that the following command does the trick:

os.system('%systemroot%\\sysnative\\cmd.exe /c vssadmin list writers > x:\\foo\\vss.txt')
jgeller
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2 Answers2

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Launch C:\Windows\SysWOW64\vssadmin.exe explicitly to always get the 64-bit version.

orlp
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  • That exposes the same error as invoking vssadmin from python. The matrix for this error is: 'Python + syswow64 = Fail python + system32 = fail os + syswow64 = fail os + system32 = proper output' I've tried this on a number of congruent environments with the same results. – jgeller Aug 15 '13 at 15:46
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Under Windows 2008 or newer you can launch c:\Windows\Sysnative\vssadmin.exe. Under Windows 2003 a hotfix is needed, but you can also create a filesystem junction to reach the 64-bit system file from 32-bit applications. For details see my answer to this question. While it was about launching 64-bit cmd.exe from 32-bit cmd.exe, the rules stay the same for all applications.

Community
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MBu
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