Updating Pester on Windows 10 1809 throw an exception

1. General summary of the issue

Updating Pester by command described in the README document (Install-Module -Name Pester -Force), throw a PublishersMismatch exception:

A Microsoft-signed module named 'Pester' with version '3.4.0' that was previously installed conflicts with the new module 'Pester' from publisher 'CN=DigiCert Assured ID Root CA, OU=www.digicert.com, O=DigiCert Inc, C=US' with version '4.4.4'. Installing the new module may result in system instability. If you still want to install or update, use -SkipPublisherCheck parameter.

2. Describe Your Environment

Pester version     : 3.4.0 C:\Program Files\WindowsPowerShell\Modules\Pester\3.4.0\Pester.psd1
PowerShell version : 5.1.17763.134
OS version         : Microsoft Windows NT 10.0.17763.0

3. Expected Behavior

The command Install-Module -Name Pester -Force installs a new Pester version side-by-side with the already installed version.

4.Current Behavior

The command Install-Module -Name Pester -Force throw the exception with FullyQualifiedError Id PublishersMismatch,Validate-ModuleAuthenticodeSignature,Microsoft.PowerShell.PackageManagement.Cmdlets.InstallPackage.

5. Possible Solution

At this moment, enabling the SkipPublisherCheck switch solves the issue.

[nohwnd]

@robdesideri Thanks for reporting this. This is a whole new level of awfulness. Could you tell me what versions of PowerShell get you have please?

get-module powershellget -List

Hi @nohwnd,

Could you tell me what versions of PowerShell get you have please?

1.0.0.1

[fflaten]

I can reproduce it with both PowerShellGet 1.0.0.1 (built-in) and latest 2.0.3 on PowerShell 5.1 (latest Win10 insider). When you only have the built-in 3.4.0 version of Pester installed, the exception is thrown. If you already have 4.4.3 and try to install 4.4.4, then it installs fine with just -Force.

[nohwnd]

I cannot replicate this, with the newer PowerShellGet. @fflaten are you sure you have the correct PowerShellGet version loaded?

Using the built-in 1.6.0 version of PoweShellGet module I get the error you see because there is no exclusion for Pester, and so -SkipPublisherCheck has to be used. So to me everything looks like it works as expected.

So @robdesideri I can only recommed updating your PowerShellGet.

[zlatin]

I think Wiki should mention updating PowerShellGet if this error occurs. Not everyone will look at closed issue to resolve the problem.

[nohwnd]

@zlatin agree :) wiki is free to edit, feel free to add the info. If you don't I will add it over the weekend. https://github.com/pester/Pester/wiki/Installation-and-Update#installing-from-psgallery-windows-10-or-windows-server-2016

[bmkaiser]

I've installed PowerShellGet 2.1.4 and am running Windows 10 1809 with PSVersion 5.1.17763.503 and am also getting the error described by @fflaten.

PS C:\WINDOWS\system32> $PSVersionTable

Name                           Value
----                           -----
PSVersion                      5.1.17763.503
PSEdition                      Desktop
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}
BuildVersion                   10.0.17763.503
CLRVersion                     4.0.30319.42000
WSManStackVersion              3.0
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1


PS C:\WINDOWS\system32> Get-Module -Name PowerShellGet -ListAvailable


    Directory: C:\Program Files\WindowsPowerShell\Modules


ModuleType Version    Name                                ExportedCommands
---------- -------    ----                                ----------------
Script     2.1.4      PowerShellGet                       {Find-Command, Find-DSCResource, Find-Module, Find-RoleCap...
Script     1.0.0.1    PowerShellGet                       {Install-Module, Find-Module, Save-Module, Update-Module...}


PS C:\WINDOWS\system32> Get-Module -Name PowerShellGet

ModuleType Version    Name                                ExportedCommands
---------- -------    ----                                ----------------
Script     2.1.4      PowerShellGet                       {Find-Command, Find-DscResource, Find-Module, Find-RoleCap...


PS C:\WINDOWS\system32> Get-Module -Name Pester -ListAvailable


    Directory: C:\Program Files\WindowsPowerShell\Modules


ModuleType Version    Name                                ExportedCommands
---------- -------    ----                                ----------------
Script     3.4.0      Pester                              {Describe, Context, It, Should...}


PS C:\WINDOWS\system32> Install-Module -Name Pester -Force -Repository PSGallery
PackageManagement\Install-Package : A Microsoft-signed module named 'Pester' with version '3.4.0' that was previously 
installed conflicts with the new module 'Pester' from publisher 'CN=DigiCert Assured ID Root CA, OU=www.digicert.com, 
O=DigiCert Inc, C=US' with version '4.8.1'. Installing the new module may result in system instability. If you still 
want to install or update, use -SkipPublisherCheck parameter.
At C:\Program Files\WindowsPowerShell\Modules\PowerShellGet\2.1.4\PSModule.psm1:9521 char:21
+ ...          $null = PackageManagement\Install-Package @PSBoundParameters
+                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (Microsoft.Power....InstallPackage:InstallPackage) [Install-Package], 
Exception
    + FullyQualifiedErrorId : 
PublishersMismatch,Validate-ModuleAuthenticodeSignature,Microsoft.PowerShell.PackageManagement.Cmdlets.InstallPackage
PackageManagement\Install-Package : A Microsoft-signed module named 'Pester' with version '3.4.0' that was previously
installed conflicts with the new module 'Pester' from publisher 'CN=DigiCert Assured ID Root CA, OU=www.digicert.com,
O=DigiCert Inc, C=US' with version '4.8.1'. Installing the new module may result in system instability. If you still
want to install or update, use -SkipPublisherCheck parameter.
At C:\Program Files\WindowsPowerShell\Modules\PowerShellGet\2.1.4\PSModule.psm1:9521 char:21
+ ...          $null = PackageManagement\Install-Package @PSBoundParameters
+                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (Microsoft.Power....InstallPackage:InstallPackage) [Install-Package],
   Exception
    + FullyQualifiedErrorId : PublishersMismatch,Validate-ModuleAuthenticodeSignature,Microsoft.PowerShell.PackageMana
   gement.Cmdlets.InstallPackage

[hassant]

$module = "C:\Program Files\WindowsPowerShell\Modules\Pester"
takeown /F $module /A /R
icacls $module /reset
icacls $module /grant Administrators:'F' /inheritance:d /T
Remove-Item -Path $Module -Recurse -Force -Confirm:$false

Install-Module -Name Pester -Force

[thuld]

@hassant Your code does not solve my problem: After executing icacls $module /grant Administrators:'F' /inheritance:d /T is the following error shown:

Administrators: No mapping between account names and security IDs was done.
Successfully processed 0 files; Failed processing 1 files

Any idea on how I could make this work?

[thuld]

It was possible when using the the name of my local user "foobar" instead of "Administrators"

icacls $module /grant _foobar_:'F' /inheritance:d /T

Once this command was executed was is possible to run the delete code

Remove-Item -Path $Module -Recurse -Force -Confirm:$false

[nohwnd]

@thuld maybe your system is in a different language and the Administrators group name is localized to that language?

[thuld]

@nohwnd You are right. My lang. is DE.