I want to automatically add and install some wsp files. To check if the file is already installed I (think I) need the identity of the solution that I am about to deploy. How can I extract the Identity of the solution out of the WSP file?

foreach ($wspFIL in $solutionsARY) {
    $fileNameSTR = $filesDIR + $wspFIL
    $identitySTR = getIdentityFromWsp fileNameSTR#... this is what I need

    Add-SPSolution -LiteralPath  $fileNameSTR
    Install-SPSolution -Identity  $identitySTR
  • 1
    AFAIK the identity is also the name of the .wsp file, is it not? So in your code above, the identity would be $wspFIL. Commented Dec 2, 2015 at 14:17

1 Answer 1


Actually, you don't need to get the Id of the solution: solutions are identified by their file names (xxxx.wsp) OR their Id.
If a solution with the same file name is already added/deployed, you cannot add another one with the same file name...

[Update 1]
Manually, the Id can be extracted by renaming the .wsp to .cab, extracting the manifest.xml file and open it to find its SolutionId attribute.
There should be a way to automate this through PowerShell.

[Update 2]
Here's the PowerShell code to automate it:

#Create a temp folder
$tempFolder = "C:\temp"
New-Item -ItemType Directory -Force -Path $tempFolder

# Extract the manifest.xml file from the wsp file
expand $fileNameSTR /f:manifest.xml $tempFolder

# Read the XML file and create namespace
$xml = [xml](Get-Content "$tempFolder\manifest.xml")
$xmlNsManager = New-Object System.Xml.XmlNamespaceManager($xml.NameTable)
$xmlNsManager.AddNamespace("ns", "http://schemas.microsoft.com/sharepoint/")

# Get the SolutionId attribute of the Solution node
$identitySTR = $xml.SelectSingleNode('//ns:Solution', $xmlNsManager).SolutionId
  • Yes, but I actually want to remove and uninstall the solution before deployment, the same way and I can't guarantee the filenames are the same...
    – Dave
    Commented Dec 2, 2015 at 14:19
  • As @dave says, you can always change the filename of a solution from what it was originally deployed with, but you would want to uninstall / update the existing one (with the old filename). Commented Dec 2, 2015 at 14:21
  • Edited my answer, and still looking for a way to automate Id extraction by code.
    – Evariste
    Commented Dec 2, 2015 at 14:23
  • Finally added the PowerShell code
    – Evariste
    Commented Dec 2, 2015 at 14:42

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