YAML Powershell Install-Module every time?

Question

Hi,
I have an pipeline that executes a powershell script. In that script I need to install a module.

### INSTALL MODULES AND LOGIN TO POWER ###
Write-Host "### Installing PBI module..." -ForegroundColor Green;
Install-module -Name "MicrosoftPowerBIMgmt" -AllowClobber -Scope CurrentUser -Verbose

My questions is: it's possible to install the module just once, without having to install every time the script runs?

Thanks.

Answer 1

Yes, if you have permissions. PS has a store of all installed modules. When you install a module you specify whether to install per user or per machine. If you install at the machine level, again assuming permissions, then the module need only be installed once. Thereafter if you try to use a command in the module then PS will auto-load the module. Technically the same thing will work with a per-user module.

What I personally recommend is that you first check to see if the module is installed. If it isn't then install the module. After that you can run normally and PS will load the module. Something like this for PS 7.1 (not tested).

   function EnsureModuleInstalled ( $name ) {  
      $module = Get-InstalledModule -Name $name  
      if ($null -eq $module) {  
         Install-Module -Name $name -Scope CurrentUser -AllowClobber  
      }  
   }  

Answer 2

Sorry, but I forget to mention that this script runs in Azure DevOps.

Answer 3

Hi,

Unless you add the "-Force" switch to the Install-Module cmdlet, the module will be skipped by default if it's already installed.
Install-Module

Best Regards，
Ian Xue

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