Upgrade WSS3 to SP2010 , missing features

Question

I am upgrading from wss3 to sp2010 (eventually to 2013) using reattach db method.

I have a custom feature in wss3, that allow user to customer the page's master page. However I don't have the feature installation file.

I only know that in WSS3, it have custom files in following path 12 hive\TEMPLATE\FEATURES 12 hive\TEMPLATE\LAYOUTS

I copy those files to the 14 hive, and run the Test-SPContentDatabase command and it show error:

The feature with Id {GUID} is referenced in the database [WSS_Content], but is not installed on the current farm. The missing feature may cause upgrade to fail. Please install any solution which contains the feature and restart upgrade if necessary.

So my question is, how can I export the feature from wss3 farm, and install back to 2010 farm?

Answer 1

The following PowerShell script will extract the solutions for you from the old farm and drop them into a folder. You can then add the one you need to the new farm.

[Void][System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SharePoint") 
$farm = [Microsoft.SharePoint.Administration.SPFarm]::Local 

$path = Split-Path $MyInvocation.MyCommand.Path 
[Void]( ni "$path\Solutions" -type Directory -force ) 

$farm.Solutions |% { 
  Write-Host $_.Name 
  $solution = $_.SolutionFile 
  $solution.SaveAs("$path\solutions\$($solution.Name)") 
}

If you'd prefer to simply remove the references, have a look at Solving [MissingSetupFile] errors from SharePoint HEalth Analyzer which contains some PowerShell to remove stale references. Note that at the bottom of that page there are links to solutions for other types of errors reported, namely missing web parts, missing aseembly and missing feature.