Obs/bin/ObsDep/content/Powershell/Roles/Common/LiveUpdate/ApplyWindowsCustomPatch.psm1

<###################################################
 # #
 # Copyright (c) Microsoft. All rights reserved. #
 # #
 ##################################################>


Import-Module -Name "$PSScriptRoot\..\RoleHelpers.psm1" -DisableNameChecking

function Cleanup-UpdateFolder
{
   [CmdletBinding()]
    param (
        [Parameter(Mandatory=$true)]
        $Session,

        [Parameter(Mandatory=$true)]
        [string]
        $Destination
    )

    $ErrorActionPreference = 'stop'

    Invoke-Command -Session $Session -ScriptBlock {

        if(Test-Path $Using:Destination)
        {
            Remove-Item -Path $Using:Destination -Recurse -Force
        }
    } -ErrorAction Stop
}

# Summary: Copy-OSCustomBinaries function copies the patches from the infra share to local drive to avoid any remote access issue during the installation process
function Copy-OSCustomBinaries
{
    [CmdletBinding()]
    param (

        [Parameter(Mandatory=$true)]
        $Session,

        [Parameter(Mandatory=$true)]
        [string]
        $Destination,

        [Parameter(Mandatory=$true)]
        [string]
        $WcpSourcePath,

        [Parameter(Mandatory=$true)]
        [string]
        $WcpSourcePathCsv,

        [Parameter(Mandatory=$true)]
        [string]
        $WcpFolderName
    )

    $ErrorActionPreference = 'stop'

    # Idempotency: Cleanup any existing or partial OS custom binary content.
    Trace-Execution "[Copy-OSCustomBinaries] cleanup any existing or partially copied custom binaries folders."
    Cleanup-UpdateFolder -Session $Session -Destination $Destination

    Trace-Execution "[Copy-OSCustomBinaries] Copying custom binaries to the local node."
    Invoke-Command -Session $Session -ScriptBlock {

        $ErrorActionPreference = 'stop'

        $tmpWcpSourcePath = $null

        if(Test-Path $Using:WcpSourcePathCsv) # to avoid intermittent loop back issue while smb share from host node
        {
            $tmpWcpSourcePath = $Using:WcpSourcePathCsv
        }
        elseif(Test-Path $Using:WcpSourcePath) # to handle situations when node is not part of cluster
        {
            $tmpWcpSourcePath = $Using:WcpSourcePath
        }
        else
        {
            throw "Cannot access wcp Smb path: '$($Using:WcpSourcePath)' and Csv path: '$($Using:WcpSourcePathCsv)'."
        }

        # Create InProgress WCP folder
        $inProgressWcpPath = Join-Path $Using:Destination "InProgress.$Using:WcpFolderName" -Verbose
        New-Item -Path $inProgressWcpPath -ItemType Directory -Force -Verbose

        # Copy WCP packages
        Copy-Item -Path "$tmpWcpSourcePath\*" -Destination $inProgressWcpPath -Recurse -Force -Verbose

        # Rename InProgress folder to final folder
        Rename-Item -Path $inProgressWcpPath -NewName $Using:WcpFolderName -Force -Verbose

    } -ErrorAction Stop
}

function Invoke-WcpInstallScript
{
   [CmdletBinding()]
    param (

        [Parameter(Mandatory=$true)]
        $Session,

        [Parameter(Mandatory=$true)]
        [string]
        $Destination,

        [Parameter(Mandatory=$true)]
        [string]
        $FolderName
    )

    $ErrorActionPreference = 'stop'

    Invoke-Command -Session $Session -ScriptBlock {

        $localWcpPath = Join-Path $Using:Destination "$Using:FolderName"

        if(Test-Path $localWcpPath)
        {
            $InstallScriptPath = Join-Path $localWcpPath "Install.ps1"

            if(Test-Path $InstallScriptPath)
            {
                & $InstallScriptPath -ErrorAction Stop -Verbose
            }
            else
            {
                throw "Install.ps1 script is NOT found under WCP folder in package: '$InstallScriptPath'."
            }
        }
    } -ErrorAction Stop
}

function Apply-WindowsCustomPatchOnline
{
   [CmdletBinding()]
    param (
        [Parameter(Mandatory=$true)]
        $Session,

        [Parameter(Mandatory=$true)]
        [string]
        $Destination,

        [Parameter(Mandatory=$true)]
        [string]
        $WcpSourcePath,

        [Parameter(Mandatory=$true)]
        [string]
        $WcpSourcePathCsv,

        [Parameter(Mandatory=$true)]
        [string]
        $WcpFolderName
    )

    $ErrorActionPreference = 'stop'

    Trace-Execution "[Apply-WindowsCustomPatchOnline] Copying OS updates ..."
    Copy-OSCustomBinaries -Session $Session -Destination $Destination -WcpSourcePath $WcpSourcePath -WcpSourcePathCsv $WcpSourcePathCsv -WcpFolderName $WcpFolderName

    Trace-Execution "[Apply-WindowsCustomPatchOnline] Installing wcp online ..."
    Invoke-WcpInstallScript -Session $Session -Destination $Destination -FolderName $WcpFolderName
}

function Get-WindowsCustomPatchLocation
{
    [CmdletBinding()]
    param
    (
        [Parameter(Mandatory=$true)]
        [CloudEngine.Configurations.EceInterfaceParameters]
        $Parameters
    )

    $urpRole = $Parameters.Roles["URP"].PublicConfiguration
    $wcpSourceFolderName = $urpRole.PublicInfo.UpdatePackagePaths.WCPFolder.Name
    Trace-Execution "[Get-WindowsCustomPatchLocation] WCP folder name '$wcpSourceFolderName'."

    $clusterName = Get-ManagementClusterName $Parameters
    Trace-Execution "[Get-WindowsCustomPatchLocation] cluster name '$clusterName'."

    $virtualMachinesRole = $Parameters.Roles["VirtualMachines"].PublicConfiguration
    $msuStorePath = Get-SharePath $Parameters $virtualMachinesRole.PublicInfo.WindowsUpdateStagingFolder.Path $clusterName
    Trace-Execution "[Get-WindowsCustomPatchLocation] management cluster store name '$msuStorePath'."

    $currentWindowsUpdatesFolder = Get-AzSVersionedPath -Path $msuStorePath -ErrorAction SilentlyContinue
    Trace-Execution "[Get-WindowsCustomPatchLocation] current windows update path '$currentWindowsUpdatesFolder'."

    $wcpUpdateFolderPath = Join-Path -Path $currentWindowsUpdatesFolder -ChildPath $wcpSourceFolderName
    Trace-Execution "[Get-WindowsCustomPatchLocation] WCP folder folder path '$wcpUpdateFolderPath'."

    return $wcpUpdateFolderPath
}

function Apply-WindowsCustomPatch
{
    [CmdletBinding()]
    param (
        [Parameter(Mandatory=$true)]
        [CloudEngine.Configurations.EceInterfaceParameters]
        $Parameters
    )

    $ErrorActionPreference = 'stop'

    $Destination="D:\Updates\OS\CustomBinary"

    # Get node name from execution context
    $nodeName = Get-ExecutionContextNodeName -Parameters $Parameters
    Trace-Execution "[Apply-WindowsCustomPatch] Node to be updated Custom OS Binary is: $nodeName."

    if([string]::IsNullOrEmpty($nodeName))
    {
        throw "No node name was provided in the execution context."
    }

    # Get domain credential
    $domainCredential = Get-DomainCredential -Parameters $Parameters
    Trace-Execution "[Apply-WindowsCustomPatch] Domain Credential UserName is $($domainCredential.UserName)."

    # Getting WCP folder names
    $urpRole = $Parameters.Roles["URP"].PublicConfiguration
    $wcpSourceFolderName = $urpRole.PublicInfo.UpdatePackagePaths.WCPFolder.Name
    Trace-Execution "[Apply-WindowsCustomPatch] WCP folder name '$wcpSourceFolderName'."

    $clusterName = Get-ManagementClusterName $Parameters
    Trace-Execution "[Apply-WindowsCustomPatch] cluster name '$clusterName'."

    $virtualMachinesRole = $Parameters.Roles["VirtualMachines"].PublicConfiguration
    $msuStorePath = Get-SharePath $Parameters $virtualMachinesRole.PublicInfo.WindowsUpdateStagingFolder.Path $clusterName
    Trace-Execution "[Apply-WindowsCustomPatch] management cluster store name '$msuStorePath'."

    $currentWindowsUpdatesFolder = Get-AzSVersionedPath -Path $msuStorePath -ErrorAction SilentlyContinue
    Trace-Execution "[Apply-WindowsCustomPatch] current windows update path '$currentWindowsUpdatesFolder'."

    $wcpUpdateFolderPath = Join-Path -Path $currentWindowsUpdatesFolder -ChildPath $wcpSourceFolderName
    Trace-Execution "[Apply-WindowsCustomPatch] WCP folder - Smb folder path '$wcpUpdateFolderPath'."

    $wcpUpdateFolderPathCsv = Get-LocalCsvPathFromSharePath -Parameters $Parameters -UNCSharePath $wcpUpdateFolderPath
    Trace-Execution "[Apply-WindowsCustomPatch] WCP folder - Csv folder path '$wcpUpdateFolderPathCsv'."

    Trace-Execution "[Apply-WindowsCustomPatch] destination folder path '$Destination'."

    # Create Remote Session
    Trace-Execution "[Apply-WindowsCustomPatch] Create remote session to '$nodeName' using creds '$($domainCredential.UserName)'."
    $Session = New-PSSession -cn $nodeName -Credential $domainCredential -Authentication Credssp

    try
    {
        Apply-WindowsCustomPatchOnline -Session $Session -Destination $Destination -WcpSourcePath $wcpUpdateFolderPath -WcpSourcePathCsv $wcpUpdateFolderPathCsv -WcpFolderName $wcpSourceFolderName
    }
    finally
    {
        $Session | Remove-PSSession -ErrorAction Ignore
    }
}

function Test-WindowsCustomPatchOnHost
{
    [CmdletBinding()]
    param (
        [Parameter(Mandatory=$true)]
        [CloudEngine.Configurations.EceInterfaceParameters]
        $Parameters,

        [Parameter(Mandatory=$true)]
        [string]
        $HostName
    )

    $ErrorActionPreference = 'stop'

    $localDestination="D:\Updates\OS\CustomBinary"

    # Getting WCP folder names
    $urpRole = $Parameters.Roles["URP"].PublicConfiguration
    $WcpFolderName = $urpRole.PublicInfo.UpdatePackagePaths.WCPFolder.Name

    $wcpFolder = Get-WindowsCustomPatchLocation -Parameters $Parameters
    Trace-Execution "WCP folder - Smb folder Path '$wcpFolder'."

    $wcpFolderCsv = Get-LocalCsvPathFromSharePath -Parameters $Parameters -UNCSharePath $wcpFolder
    Trace-Execution "WCP folder -Csv folder Path '$wcpFolderCsv'."

    $evaluatePs1 = [System.IO.Path]::Combine($wcpFolder, "Evaluate.ps1")
    Trace-Execution "evaluate.ps1 full path '$evaluatePs1'."

    if (![System.IO.File]::Exists($evaluatePs1))
    {
        throw "Evaluate.ps1 was not found."
    }

    $credential = Get-DomainCredential -Parameters $Parameters

    $localEvaluatePs1 = [System.IO.Path]::Combine($LocalDestination, $WcpFolderName, "Evaluate.ps1")
    Trace-Execution "Local evaluate.ps1 full path '$localEvaluatePs1'."

    # Create Remote Session
    Trace-Execution "Create remote session to '$HostName' using creds '$($credential.UserName)'."
    $Session = New-PSSession -ComputerName $HostName -Credential $credential -Authentication Credssp

    try
    {
        Trace-Execution "Copying OS updates to local directory on host..."
        $null = Copy-OSCustomBinaries -Session $Session -Destination $LocalDestination -WcpSourcePath $wcpFolder -WcpSourcePathCsv $wcpFolderCsv -WcpFolderName $WcpFolderName

        Trace-Execution "Running evaluate.ps1 locally on host '$HostName' using '$($credential.UserName)'."
        $result = Invoke-Command -Session $Session -ScriptBlock { & "$($using:localEvaluatePs1)" -ErrorAction Stop -Verbose }
    }
    finally
    {
        $Session | Remove-PSSession -ErrorAction Ignore
    }

    Trace-Execution "Result of running evaluate.ps1 on host '$HostName' is '$result'."

    return $result
}

Export-ModuleMember Apply-WindowsCustomPatch
Export-ModuleMember Get-WindowsCustomPatchLocation
Export-ModuleMember Test-WindowsCustomPatchOnHost
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