Az.ConnectedKubernetes

0.11.0

ConnectedKubernetes.Autorest/custom/helpers/HelmHelper.ps1

                                [CmdletBinding()]

param()

function Set-HelmClientLocation {

    [Microsoft.Azure.PowerShell.Cmdlets.ConnectedKubernetes.DoNotExportAttribute()]

    param(

    )

    process {

        Write-Debug "Setting Helm client location."

        $HelmLocation = Get-HelmClientLocation

        if ($null -eq $HelmLocation) {

            Write-Debug "Helm location not found."

            return

        }

        if (!($env:Path.contains($HelmLocation)) -and (Test-Path $HelmLocation)) {

            Write-Debug "Updating PATH environment variable with Helm location."

            $PathStr = $HelmLocation + ";$env:Path"

            Set-Item -Path Env:Path -Value $PathStr

        }

    }

}

function Get-HelmClientLocation {

    [Microsoft.Azure.PowerShell.Cmdlets.ConnectedKubernetes.DoNotExportAttribute()]

    param(

    )

    process {

        Write-Debug "Getting Helm client location."

        if (IsWindows -and IsAmd64) {

            Write-Debug "Detected Windows AMD64 architecture."

            if (Test-Path Env:HELM_CLIENT_PATH) {

                $CustomPath = (Get-Item Env:HELM_CLIENT_PATH).Value

                Write-Debug "Custom Helm path detected: $CustomPath"

                if ($CustomPath.EndsWith("helm.exe") -and (!((Get-Item $CustomPath) -is [System.IO.DirectoryInfo]))) {

                    $CustomPath = $CustomPath.Replace("helm.exe", "")

                }

                return $CustomPath

            }

            if (Test-Path Env:Home) {

                $HomePath = (Get-Item Env:HOME).Value

            }

            else {

                $HomePath = $Home

            }

            # $Version = "v3.6.3"

            $Version = "v3.12.2"

            $ZipName = "helm-$Version-windows-amd64.zip"

            $RootFolder = Join-Path -Path $HomePath -ChildPath ".azure" | Join-Path -ChildPath "helm" | Join-Path -ChildPath "$Version"

            $ZipLocation = Join-Path -Path $RootFolder -ChildPath $ZipName

            $InstallLocation = Join-Path -Path $RootFolder -ChildPath "windows-amd64"

            $HelmLocation = Join-Path -Path $InstallLocation -ChildPath "helm.exe"

            try {

                if (!(Test-Path $RootFolder)) {

                    Write-Debug "Creating Helm root folder: $RootFolder"

                    $null = New-Item $RootFolder -ItemType Directory

                }

                if ((!(Test-Path $HelmLocation))) {

                    Write-Debug "Downloading Helm zip to: $ZipLocation"

                    Invoke-WebRequest -Uri "https://k8connecthelm.azureedge.net/helmsigned/$ZipName" -OutFile $ZipLocation -UseBasicParsing

                    Write-Debug "Extracting Helm zip to: $RootFolder"

                    Expand-Archive $ZipLocation $RootFolder

                    Write-Verbose "Downloaded helm: $HelmLocation"

                }

            }

            catch {

                throw "Failed to download helm ($_)"

            }

        }

        else {

            Write-Warning "Helm version 3.6.3 is required. Learn more at https://aka.ms/arc/k8s/onboarding-helm-install"

        }

        return $InstallLocation

    }

}

function Get-ReleaseInstallNamespace {

    [Microsoft.Azure.PowerShell.Cmdlets.ConnectedKubernetes.DoNotExportAttribute()]

    param(

    )

    process {

        Write-Debug "Getting Helm release install namespace."

        return "azure-arc-release"

    }

}

function IsWindows {

    [Microsoft.Azure.PowerShell.Cmdlets.ConnectedKubernetes.DoNotExportAttribute()]

    param(

    )

    process {

        Write-Debug "Determining if the system is Windows."

        return (Get-OSName).contains("Windows")

    }

}

function Get-OSName {

    [Microsoft.Azure.PowerShell.Cmdlets.ConnectedKubernetes.DoNotExportAttribute()]

    param(

    )

    process {

        Write-Debug "Getting the operating system name."

        if ($PSVersionTable.PSEdition.Contains("Core")) {

            $OSPlatform = $PSVersionTable.OS

        }

        else {

            $OSPlatform = $env:OS

        }

        return $OSPlatform

    }

}

function IsAmd64 {

    [Microsoft.Azure.PowerShell.Cmdlets.ConnectedKubernetes.DoNotExportAttribute()]

    param(

    )

    process {

        Write-Debug "Checking if the architecture is AMD64."

        $isSupport = [Environment]::Is64BitOperatingSystem -and ($env:PROCESSOR_ARCHITECTURE -eq "AMD64")

        return $isSupport

    }

}

function Get-HelmChartPath {

    [Microsoft.Azure.PowerShell.Cmdlets.ConnectedKubernetes.DoNotExport()]

    param (

        [Parameter(Mandatory)]

        [string]$RegistryPath,

        [Parameter(Mandatory)]

        [string]$HelmClientLocation,

        [string]$KubeConfig,

        [string]$KubeContext,

        [string]$ChartFolderName = 'AzureArcCharts',

        [string]$ChartName = 'azure-arc-k8sagents',

        [bool]$NewPath = $true

    )

    Write-Debug "Preparing to export Helm chart to a specific path."

    # Special path!

    $PreOnboardingHelmChartsFolderName = 'PreOnboardingChecksCharts'

    # Exporting Helm chart

    Write-Verbose "Using 'helm' to add Azure Arc resources to Kubernetes cluster"

    $ChartExportPath = Join-Path $env:USERPROFILE ('.azure', $ChartFolderName -join '\')

    try {

        if (Test-Path $ChartExportPath) {

            Write-Debug "Cleaning up existing Helm chart folder at: $ChartExportPath"

            Remove-Item $ChartExportPath -Recurse -Force

        }

    }

    catch {

        Write-Warning -Message "Unable to cleanup the $ChartFolderName already present on the machine. In case of failure, please cleanup the directory '$ChartExportPath' and try again."

    }

    Write-Debug "Starting Helm chart export to path: $ChartExportPath"

    Get-HelmChart -RegistryPath $RegistryPath -ChartExportPath $ChartExportPath -KubeConfig $KubeConfig -KubeContext $KubeContext -HelmClientLocation $HelmClientLocation -NewPath $NewPath -ChartName $ChartName

    # Returning helm chart path

    $HelmChartPath = Join-Path $ChartExportPath $ChartName

    if ($ChartFolderName -eq $PreOnboardingHelmChartsFolderName) {

        $ChartPath = $HelmChartPath

    }

    else {

        $ChartPath = if ($env:HELMCHART) { $env:HELMCHART } else { $HelmChartPath }

    }

    Write-Debug "Helm chart path is: $ChartPath"

    return $ChartPath

}

function Get-HelmChart {

    [Microsoft.Azure.PowerShell.Cmdlets.ConnectedKubernetes.DoNotExport()]

    param (

        [Parameter(Mandatory)]

        [string]$RegistryPath,

        [Parameter(Mandatory)]

        [string]$ChartExportPath,

        [string]$KubeConfig,

        [string]$KubeContext,

        [Parameter(Mandatory)]

        [string]$HelmClientLocation,

        [bool]$NewPath,

        [string]$ChartName = 'azure-arc-k8sagents',

        [int]$RetryCount = 5,

        [int]$RetryDelay = 3

    )

    $chartUrl = $RegistryPath.Split(':')[0]

    $chartVersion = $RegistryPath.Split(':')[1]

    if ($NewPath) {

        # Version check for stable release train (chart_version will be in X.Y.Z format as opposed to X.Y.Z-NONSTABLE)

        if (-not $chartVersion.Contains('-') -and ([version]$chartVersion -lt [version]"1.14.0")) {

            $errorSummary = "This CLI version does not support upgrading to Agents versions older than v1.14"

            # Assuming telemetry.set_exception and consts.Operation_Not_Supported_Fault_Type are handled elsewhere

            throw "Operation not supported on older Agents: $errorSummary"

        }

        # We do not use Split-Path here because it results in "\" characters in

        # the results.

        $basePath, $imageName = if ($chartUrl -match "(^.*?)/([^/]+$)") { $matches[1], $matches[2] }

        $chartUrl = "$basePath/v2/$imageName"

        # Write-Error "Chart URL: $chartUrl"

    }

    $cmdHelmChartPull = @($HelmClientLocation, "pull", "oci://$chartUrl", "--untar", "--untardir", $ChartExportPath, "--version", $chartVersion)

    if ($KubeConfig) {

        $cmdHelmChartPull += "--kubeconfig", $KubeConfig

    }

    if ($KubeContext) {

        $cmdHelmChartPull += "--kube-context", $KubeContext

    }

    Write-Debug "Pull helm chart: $cmdHelmChartPull[0] $cmdHelmChartPull[1..($cmdHelmChartPull.Count - 1)]"

    for ($i = 0; $i -lt $RetryCount; $i++) {

        try {

            Invoke-ExternalCommand $cmdHelmChartPull[0] $cmdHelmChartPull[1..($cmdHelmChartPull.Count - 1)]

            break

        }

        catch {

            Start-Sleep -Seconds $RetryDelay

        }

    }

    if ($i -eq $RetryCount) {

        # Assuming telemetry.set_exception and consts.Pull_HelmChart_Fault_Type are handled elsewhere

        throw "Unable to pull '$ChartName' helm chart from the registry '$RegistryPath'."

    }

}

# This method exists to allow us to effectively Mock the call operator (&).

# We cannnot do that directly so instead we have this wrapper, which we can mock!

function Invoke-ExternalCommand {

    [Microsoft.Azure.PowerShell.Cmdlets.ConnectedKubernetes.DoNotExport()]

    param (

        [Parameter(Mandatory = $true)]

        [string]$Command,

        [array]$Arguments

    )

    & $Command $Arguments

}

function Set-HelmRepositoryAndModules {

    param (

        [string]$KubeConfig,

        [string]$KubeContext,

        [string]$Location,

        [string]$ProxyCert,

        [bool]$DisableAutoUpgrade,

        [string]$ContainerLogPath,

        [string]$CustomLocationsOid

    )

    Write-Debug "Setting Helm repository and checking for required modules."

    if ((Test-Path Env:HELMREPONAME) -and (Test-Path Env:HELMREPOURL)) {

        $HelmRepoName = Get-ChildItem -Path Env:HELMREPONAME

        $HelmRepoUrl = Get-ChildItem -Path Env:HELMREPOURL

        helm repo add $HelmRepoName $HelmRepoUrl --kubeconfig $KubeConfig --kube-context $KubeContext

    }

    $resources = Get-Module Az.Resources -ListAvailable

    if ($null -eq $resources) {

        Write-Error "Missing required module(s): Az.Resources. Please run 'Install-Module Az.Resources -Repository PSGallery' to install Az.Resources."

        return

    }

    if (Test-Path Env:HELMREGISTRY) {

        $RegistryPath = Get-ChildItem -Path Env:HELMREGISTRY

    }

    else {

        $ReleaseTrain = ''

        if ((Test-Path Env:RELEASETRAIN) -and (Test-Path Env:RELEASETRAIN)) {

            $ReleaseTrain = Get-ChildItem -Path Env:RELEASETRAIN

        }

        else {

            $ReleaseTrain = 'stable'

        }

        $AzLocation = Get-AzLocation | Where-Object { ($_.DisplayName -ieq $Location) -or ($_.Location -ieq $Location) }

        $Region = $AzLocation.Location

        if ($null -eq $Region) {

            Write-Error "Invalid location: $Location"

            return

        }

        else {

            $Location = $Region

        }

        $ChartLocationUrl = "https://${Location}.dp.kubernetesconfiguration.azure.com/azure-arc-k8sagents/GetLatestHelmPackagePath?api-version=2019-11-01-preview&releaseTrain=${ReleaseTrain}"

        $Uri = [System.Uri]::New($ChartLocationUrl)

        $Account = [Microsoft.Azure.Commands.Common.Authentication.Abstractions.AzureRmProfileProvider]::Instance.Profile.DefaultContext.Account

        $Env = [Microsoft.Azure.Commands.Common.Authentication.Abstractions.AzureEnvironment]::PublicEnvironments[[Microsoft.Azure.Commands.Common.Authentication.Abstractions.EnvironmentName]::AzureCloud]

        $TenantId = [Microsoft.Azure.Commands.Common.Authentication.Abstractions.AzureRmProfileProvider]::Instance.Profile.DefaultContext.Tenant.Id

        $PromptBehavior = [Microsoft.Azure.Commands.Common.Authentication.ShowDialog]::Never

        $Token = [Microsoft.Azure.Commands.Common.Authentication.AzureSession]::Instance.AuthenticationFactory.Authenticate($account, $env, $tenantId, $null, $promptBehavior, $null)

        $AccessToken = $Token.AccessToken

        $HeaderParameter = @{

            "Authorization" = "Bearer $AccessToken"

        }

        $Response = Invoke-WebRequest -Uri $Uri -Headers $HeaderParameter -Method Post -UseBasicParsing

        if ($Response.StatusCode -eq 200) {

            $RegistryPath = ($Response.Content | ConvertFrom-Json).repositoryPath

        }

        else {

            Write-Error "Error while fetching helm chart registry path: ${$Response.RawContent}"

            return

        }

    }

    Set-Item -Path Env:HELM_EXPERIMENTAL_OCI -Value 1

    return $RegistryPath

}

function Get-HelmReleaseNamespaces {

    param (

        [string]$KubeConfig,

        [string]$KubeContext

    )

    Write-Debug "Getting release namespace."

    $ReleaseInstallNamespace = Get-ReleaseInstallNamespace

    $ReleaseNamespace = $null

    try {

        $ReleaseNamespace = (helm status azure-arc -o json --kubeconfig $KubeConfig --kube-context $KubeContext -n $ReleaseInstallNamespace 2> $null | ConvertFrom-Json).namespace

    }

    catch {

        Write-Error "Fail to find the namespace for azure-arc."

    }

    #  return @{"site" = $($site); "app" = $($app)}

    return , @{"ReleaseNamespace" = $($ReleaseNamespace); "ReleaseInstallNamespace" = $($ReleaseInstallNamespace) }

}

function Confirm-HelmVersion {

    param (

        [string]$KubeConfig

    )

    Write-Debug "Setting up Helm client location and validating Helm version."

    try {

        Set-HelmClientLocation

        $HelmVersion = helm version --template='{{.Version}}' --kubeconfig $KubeConfig

        if ($HelmVersion.Contains("v2")) {

            Write-Error "Helm version 3+ is required (not ${HelmVersion}). Learn more at https://aka.ms/arc/k8s/onboarding-helm-install"

            return

        }

        $HelmVersion = helm version --short --kubeconfig $KubeConfig

        # Compare the helm version to 3.8 in a symantic versioning valid way

        # Strip the leading "v" from the helm version and discard any metadata

        $HelmVersion = $HelmVersion.Substring(1)

        $HelmVersion = $HelmVersion.Split('+')[0]

        $helmV380 = [System.Version]::Parse("3.8.0")

        $helmThisVersion = [System.Version]::Parse($HelmVersion)

        if ($helmThisVersion -lt $helmV380) {

            Write-Error "Helm version of at least 3.8 is required for latest OCI handling."

            return

        }

    }

    catch {

        throw "Failed to install Helm version 3+ ($_). Learn more at https://aka.ms/arc/k8s/onboarding-helm-install"

    }

}

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