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AnswerDot-Sourcing a PowerShell script in .NET and then running a cmdlet defined in the script.

  • Thursday, June 25, 2009 6:04 PMlushdog Users MedalsUsers MedalsUsers MedalsUsers MedalsUsers Medals
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    The HyperV guys have a nice hyperv.ps1 script that contains definitions for cmdlets like (Get-VM, Get-VMHost etc. etc.).

    So in the PowerShell command line i dot source (. ./hyperv.ps1) then run 'Get-VM' and all is well.

    I'd like to do the same from .Net:

    string scriptContents = string.Empty;
using(StreamReader fs = new StreamReader(@"hyperv.ps1"))
{
  scriptContents = fs.ReadToEnd();
}
.
.
.
.
pipeline.Commands.AddScript("scriptContents");
pipeline.Command.Add(new Command("Get-VM"));
pipeline.Invoke();
    Unfortunately I get a CommandNOtFoundException :"The term 'Get-VMHost' is not recognized as a cmdlet, function, operable program, or script file. Verify the term and try again." 

    Thanks for your help in advance.

    Matt




     

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  • Thursday, June 25, 2009 6:31 PMMarco ShawMVP, ModeratorUsers MedalsUsers MedalsUsers MedalsUsers MedalsUsers Medals
     
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    That's a good one.

    Since this is a runspace, I think I'd try this first by modifying the function in hyper.ps1:

    Instead of:
    function get-vm {...
    }

    Change it to:
    function global:get-vm {...
    }

    Then when you load hyper.ps1, I think you will have access to the function in your current scope.

    I don't know what might be the implications of changing *all* the functions to be in the global scope in this case.
     
  • Thursday, June 25, 2009 10:42 PMlushdog Users MedalsUsers MedalsUsers MedalsUsers MedalsUsers Medals
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    I figured out that i should be loading the script in the runspace rather than the pipeline: 

    myRunspaceInvoke.Invoke(". ./hyperv.ps1");

    Unfortunately I get a "AuthorizationManager check failed." exception as I believe the script is not signed or some other authentication problem.
     
  • Friday, June 26, 2009 1:38 PMMarco ShawMVP, ModeratorUsers MedalsUsers MedalsUsers MedalsUsers MedalsUsers Medals
     
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    Are you using the new v2 CTP3 here?

    Known problem:
    https://connect.microsoft.com/feedback/ViewFeedback.aspx?FeedbackID=466285&SiteID=99
     
  • Friday, June 26, 2009 5:17 PMlushdog Users MedalsUsers MedalsUsers MedalsUsers MedalsUsers Medals
     
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    Nope I'm using Powershell 1.0.

    I can't seem to find that feedback item you've linked.

    Can you cut and paste the summary here so I can read it over?
     
  • Friday, June 26, 2009 5:53 PMMarco ShawMVP, ModeratorUsers MedalsUsers MedalsUsers MedalsUsers MedalsUsers Medals
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    I'll have to try some more testing with runspaces.  This may be related directly to WMI though...

    When the WMI service (winmgmt) is "paused", the policy execution equal to "AllSigned" and i run powershell.exe, i get this error :
    -------
    Windows PowerShell V2 (Community Technology Preview - Features Subject to Change)
    Copyright (C) 2008 Microsoft Corporation. All rights reserved.

    AuthorizationManager check failed.
    At line:1 char:2
    + . <<<< 'C:\Documents and Settings\UserTest\Mes documents\WindowsPowerShell\profile.ps1'
        + CategoryInfo         : NotSpecified: (:) [], PSSecurityException
        + FullyQualifiedErrorId : RuntimeException

    AuthorizationManager check failed.
    At line:1 char:2
    + . <<<< 'C:\Documents and Settings\UserTest\Mes documents\WindowsPowerShell\Microsoft.PowerShell_profile.ps1'
        + CategoryInfo         : NotSpecified: (:) [], PSSecurityException
        + FullyQualifiedErrorId : RuntimeException
     
  • Friday, June 26, 2009 6:54 PMlushdog Users MedalsUsers MedalsUsers MedalsUsers MedalsUsers Medals
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    Good call, but my service is running so I don't think this is the case for my issue.

    I was thinking that perhaps it is due to the fact that even if you set the execution policy to allow any script to run, you are still prompted to allow a script to run:

    Security Warning
Run only scripts that you trust. While scripts from the Internet can be useful, this script can potentially harm your
computer. Do you want to run C:\hyperv.ps1?
[D] Do not run  [R] Run once  [S] Suspend  [?] Help (default is "D"): r
    Perhaps this is why the AuthorizationManager check fail is being raised as there is no user confirmation when dot-sourcing/running a script from .net.
     
  • Friday, June 26, 2009 7:10 PMMarco ShawMVP, ModeratorUsers MedalsUsers MedalsUsers MedalsUsers MedalsUsers Medals
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    If you used IE to download this script, right-click on hyperv.ps1 and select "unblock".  That might be your problem...
     
  • Monday, June 29, 2009 7:46 PMlushdog Users MedalsUsers MedalsUsers MedalsUsers MedalsUsers Medals
     
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    Yep that got rid of the 'prompt' which made it work ok in .NET.

    Thanks for you help.

    On a side note I went with putting the cmdlet code from the .ps1 file into string resources in my .NET project as I do not want the need for the heightened priviledges required for dot-sourcing a script.