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Get-DscResource throws an error when there is an Inheritance in class based DSC Resources #489
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Activity
I'm afraid that's not a bug from a DSC Resource of the Resources Kit, but a PowerShell one.
As you are using Windows PowerShell, your best bet is probably to open a support request with Microsoft, but not sure it'd go very far.
If you can reproduce on PS Core, you might want to file it on the PowerShell/PowerShell github repository.Btw, I love the work you guys do there 🤓
I'll leave that open for now so that the community can see it, learn, and maybe find tips & work around.
Reacted by SimeonGerginovHi SimeonGerginov,
I struggle to reproduce your error.
Could you please let me know what's your$PSversionTable.PSVersion
Also do aget-module -listAvailable PSDesiredStateConfiguration(could be my environment that has been altered).
Could you provide a repository with the modules and tests you run?To attempt to reproduce I created two modules:
├───ClassExtends │ ClassExtends.psd1 │ ClassExtends.psm1 │ ├───ClassRsrcWithSubType2 │ ClassRsrcWithSubType2.psd1 │ ClassRsrcWithSubType2.psm1The ClassRsrcWithSubType2 is just a Class based resource that works fine.
The Second is this, as per your issue:Using module ClassRsrcWithSubType2 [DscResource()] class ClassExtends : ClassRsrcWithSubType2 { [DscProperty()] [string] $stuff }
When I do:
ipmo ClassRsrcWithSubType2
thenGet-DsCResourceI have no (related) issues as you mention, and it does find myClassExtendsresource.I do see why it could fail (if it duplicates the class entry in the cache), but it does not seem to (for me).
- PowerShell version
PS C:\windows\system32> $PSversionTable.PSVersion Major Minor Build Revision ----- ----- ----- -------- 5 1 17763 592- Desired State Configuration Module
PS C:\windows\system32> Get-Module -ListAvailable PSDesiredStateConfiguration Directory: C:\windows\system32\WindowsPowerShell\v1.0\Modules ModuleType Version Name ExportedCommands ---------- ------- ---- ---------------- Manifest 1.1 PSDesiredStateConfiguration {Set-DscLocalConfigurationManager, Start-DscConfiguration, Test-DscConfiguration, Publish-DscConfiguration...}Well based on your example I get the impression that ClassRsrcWithSubType2 is a Class based DSC Resource but in my case BaseDSC is not a DSC Resource. It is a PowerShell class only that is then extended by the DSC Resources. So that may be the reason why the error is not reproduced.
P.S. If the bug is still not reproduced, I will provide an example module with more details.
Description: There seems to be a problem when having base classes for DSC Resources you want to reuse. The problem occurs when having the 'Using module' clause, if you define the base class in the same file, no error is thrown. However, this way you cannot reuse base classes for multiple DSC Resources.
Full Example:
BaseDSC class is defined in a separate module 'Base'.
With 'Using module' I import it in the Resource module:
When you import the module and call Get-DscResource:
The following error is thrown:
The problem only occurs when calling Get-DscResource in the same process as Import-Module. If we Import the module in one process and call Get-DscResource in another, the error does not occur.