Scripts/Installation.ps1
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class CmxInstallation { [string] GetFolder() { <# .SYNOPSIS Gets the path to the official powershell installation folder for the current user. #> return [Environment]::GetFolderPath('MyDocuments') + '\WindowsPowerShell\Modules\CmxModule' } [PsCustomObject] GetSymlinkFolder() { <# .SYNOPSIS Gets the symlink folder. The symlink folder has the name "LATEST". #> [PsCustomObject]$result = @{ ExistsFolder = $false ExistsTarget = $false Target = $null Path = $null } $installationDir = $this.GetFolder() Write-Host "InstallationDir: $installationDir" $latestPath = $installationDir + '\LATEST' $result.Path = $latestPath $latestFolder = Get-Item $latestPath Write-Host "LatestPath: $latestFolder" if(Test-Path -Path $latestFolder -PathType Container) { Write-Verbose "The item is a folder." $result.ExistsFolder = $true if($latestFolder.LinkType -eq "SymbolicLink") { Write-Verbose "The item is a symbolic link." $result.ExistsTarget = $true; [string]$result.Target = $latestFolder.Target } } return $result } [PsCustomObject] GetVersionFolder() { <# .SYNOPSIS Gets the version folder with the highest version. #> [PsCustomObject]$result = @{ ExistsPath = $false Version = $null Path = $null } $installationDir = $this.GetFolder() $refVersion = [System.Version]::new() $latestVersion = (Get-ChildItem $installationDir).Name | Where-Object { $true -eq [System.Version]::TryParse($_,[ref]$refVersion) } | Foreach-Object { [System.Version]::Parse($_) } | Sort-Object | Select-Object -Last 1 $latestVersionFolder = $latestVersion.ToString() if($null -ne $latestVersionFolder) { Write-Host "Version: $latestVersionFolder" $result.Version = $latestVersionFolder $pathToLatestModule = $installationDir + '\' + $latestVersionFolder Write-Host "Path: $pathToLatestModule" $result.Path = $pathToLatestModule if(Test-Path -Path $pathToLatestModule -PathType Container) { $result.ExistsPath = $true } } return $result } [bool] IsSymlinkFolderUpdateToDate() { <# .SYNOPSIS Checks whether the symlink folder points to the version folder with the highest version. #> $symlink = $this.GetSymlinkFolder() if($symlink.ExistsFolder -and $symlink.ExistsTarget) { $versionFolder = $this.GetVersionFolder() if($versionFolder.ExistsPath) { $resolvedVersionPath = [System.IO.Path]::GetFullPath($versionFolder.Path) Write-Host "Version Path: $resolvedVersionPath" $resolvedSymlinkTarget = [System.IO.Path]::GetFullPath($symlink.Target) Write-Host "Symlink Target: $resolvedSymlinkTarget" return $resolvedVersionPath -eq $resolvedSymlinkTarget } } return $false } [bool] DeleteSymlinkFolder() { <# .SYNOPSIS Deletes the symlink folder. #> $symlink = $this.GetSymlinkFolder() if($symlink.ExistsFolder) { $latestItem = Get-Item $symlink.Path $latestItem.Delete() return $true } return $false } CreateSymlinkFolder() { <# .SYNOPSIS Creates a new symlink folder which points to the version folder with the highest version. #> $versionFolder = $this.GetVersionFolder() if($versionFolder.ExistsPath) { $target = [System.IO.Path]::GetFullPath($versionFolder.Path) Write-Host "Target: $target" $installationDir = $this.GetFolder() Write-Host "InstallationDir: $installationDir" $source = $installationDir + '\LATEST' New-Item -ItemType SymbolicLink -Path $source -Target $target | Out-Null } } static UpdateSymlinkFolder() { <# .SYNOPSIS Checks whether a symlink folder exists and whether the symlink folder points to the version folder with the highest version. If not, then deletes the current and creates a new symlink folder. #> $instance = [CmxInstallation]::new() if(-not ($instance.IsSymlinkFolderUpdateToDate())) { Write-Host "The symlink folder is out of date." Write-Host "Try to update the symlink folder." $instance.DeleteSymlinkFolder $instance.CreateSymlinkFolder $result = $instance.IsSymlinkFolderUpdateToDate Write-Host "Succeeded to update the symlink folder: $result" return } Write-Host "The symlink folder is already up to date." } } function CmxInstallationUpdateSymlinkFolder { <# .SYNOPSIS Checks whether a symlink folder exists and whether the symlink folder points to the version folder with the highest version. If not, then deletes the current and creates a new symlink folder. #> [CmdletBinding()] param() [CmxInstallation]::UpdateSymlinkFolder() } |