2010 - Update-SPSolution required after solution installed?

Question

I created a new feature and performed a Uninstall/Remove/Add/Install-SPSolution using PowerShell to deploy it. The solution deployed correctly and the feature was added to the 14 hive, but did not appear in the UI until I performed an Update-SPSolution. Only after I performed this update was the feature usable.

Why on earth would an update be required in order to make the feature visible, when the solution has just been freshly installed?

Answer 1

Just run Update-SPSolution and theh Install-SPFeature

Here is my code:

$WSPpath = "$($dataFolder)\WSP"
$wspWeb = Get-SPWeb $SiteUrl

foreach($wsp in Get-ChildItem -Path $WSPpath -Exclude "*.ps1")
{
       $sol = $null


       $sol = Get-SPSolution -Identity $wsp.Name -ErrorAction SilentlyContinue

       if($sol -ne $null)
       {
             Write-Output "Updating solution $($wsp.FullName)"
             Update-SPSolution -LiteralPath $wsp.FullName -Identity $wsp.Name -GACDeployment -Force

       }
       else
       {
             Write-Output "Installing solution $($wsp.FullName)"
             $sol = Add-SPSolution -LiteralPath $wsp.FullName

           if($sol.ContainsWebApplicationResource)
           {
               Install-SPSolution -Identity $sol -WebApplication $wspWeb.Site.WebApplication.Url -GACDeployment
           }
           else
           {
                 Install-SPSolution -Identity $sol -GACDeployment
           }
       }

        $sol = Get-SPSolution $wsp.Name
        while($sol.JobExists)
        {
            Write-Output "Installing solution $($wsp.Name) ...."
            Start-Sleep -Seconds 5
            $sol = Get-SPSolution $wsp.Name
        }
}

Install-SPFeature -AllExistingFeatures