Repack a NuGet package with a new ID

repack.ps1

<#
.SYNOPSIS
    Creates a package with the same content as another package, but with a new ID.
.PARAMETER Id
    The original ID of the package to download.
.PARAMETER NewId
    The ID of the package to create.
.PARAMETER Version
    The version of the package to download.
.PARAMETER OutDir
    The directory to write the new nupkg file to.
.PARAMETER Source
    The URL to the NuGet server to download the original package from.
#>
[CmdletBinding(SupportsShouldProcess=$true,ConfirmImpact='Low')]
Param(
    [Parameter(Mandatory=$true,Position=1)]
    [string]$Id,
    [Parameter(Mandatory=$true,Position=2)]
    [string]$NewId,
    [Parameter(Mandatory=$true,Position=3)]
    [string]$Version,
    [Parameter()]
    [string]$OutDir = '.',
    [Parameter()]
    [string]$Source = 'https://api.nuget.org/v3/index.json'
)

# Intentionally use a nonsense framework so that no dependencies will be downloaded.
$Framework = 'net42'

if (Test-Path $Id) {
    Remove-Item -Recurse $Id
}

if ($PSCmdlet.ShouldProcess("$($Id).$Version", "nuget install")) {
    $script:ProgressPreference = 'SilentlyContinue'
    try {
        $NuGetToolPath = Get-Command nuget.exe
    } catch {
        Invoke-WebRequest -Uri "https://dist.nuget.org/win-x86-commandline/latest/nuget.exe" -OutFile nuget.exe
        $NuGetToolPath = '.\nuget.exe'
    }
    Write-Progress -Activity "Installing $Id $Version"
    & $NuGetToolPath install $Id -version $Version -source $Source -packagesavemode nuspec -excludeversion -framework $Framework -Verbosity quiet
    if ($LASTEXITCODE -ne 0) {
        exit $LASTEXITCODE
    }
}

# Delete the signature file, if there is one.
$SignatureFilePath = "$Id\.signature.p7s"
If (Test-Path $SignatureFilePath) {
    Remove-Item $SignatureFilePath
}

$NuspecFilePath = Join-Path $PWD "$Id\$Id.nuspec"
if ($PSCmdlet.ShouldProcess("Replace package ID `"$Id`" with `"$NewId`"?")) {
    [xml]$nuspec = Get-Content $NuspecFilePath
    $nuspec.package.metadata.id = $NewId
    $nuspec.Save($NuspecFilePath)
}

if ($PSCmdlet.ShouldProcess("Pack `"$NewId`"?")) {
    Write-Progress -Activity "Packing $NewId $Version"
    & $NuGetToolPath pack $NuspecFilePath -OutputDirectory $OutDir
}

# Clean up unpacked directory
Remove-Item $Id -Recurse

Write-Progress -Activity Repack -Completed