SyncFilesToSlot.ps1

<#
 .SYNOPSIS
    Copies all of a web app's files to a given slot

 .DESCRIPTION
    Copies all of a web app's files to a given slot. Skips "newrelic" folder as the files are in use.
    
 .PARAMETER SubscriptionId
    The subscription id where the resources reside.

 .PARAMETER ResourceGroupName
    The resource group where the resources reside.

 .PARAMETER WebAppName
    Name of the web app containing files for the slot.
    
 .PARAMETER SlotName
    Name of the slot to fill with files from web app.
#>

param(
    [string]
    $SubscriptionId,

    [Parameter(Mandatory = $True)]
    [string]
    $ResourceGroupName,

    [Parameter(Mandatory = $false)]
    [string]
    $WebAppName,

    [Parameter(Mandatory = $True)]
    [string]
    $SlotName
)

[System.Reflection.Assembly]::LoadWithPartialName("Microsoft.Web.Deployment")

function Get-AzureRmWebAppPublishingCredentials($ResourceGroupName, $WebAppName, $SlotName = $null){
  if ([string]::IsNullOrWhiteSpace($SlotName)) {
    $resourceType = "Microsoft.Web/sites/config";
    $resourceName = "$WebAppName/publishingcredentials";
  }
  else {
    $resourceType = "Microsoft.Web/sites/slots/config";
    $resourceName = "$WebAppName/$SlotName/publishingcredentials";
  }
  $publishingCredentials = Invoke-AzureRmResourceAction -ResourceGroupName $ResourceGroupName -ResourceType $resourceType -ResourceName $resourceName -Action list -ApiVersion 2016-08-01 -Force;
  return $publishingCredentials;
}

function GetScmUrl($ResourceGroupName, $WebAppName, $SlotName) {
    # revert to this when MS fixes https://social.msdn.microsoft.com/Forums/expression/en-US/938e59f6-6a83-4640-a423-26fe91d66cf3/scm-uri-for-web-app-deployment-slots
    #$scmUrl = $publishingCredentials.properties.scmUri
    #$scmUrlNoCreds = $scmUrl.Replace($scmUrl.Substring($scmUrl.IndexOf('$'), ($scmUrl.IndexOf('@')-$scmUrl.IndexOf('$')+1)), '')
    #$apiUrl = "$scmUrl/api/command"
    # revert below
    if($SlotName) {
        $slot = Get-AzureRmWebAppSlot -ResourceGroupname $ResourceGroupName -Name $WebAppName -Slot $SlotName;
        $scmUrl = $slot.EnabledHostNames | where { $_.Contains('.scm.') };
    } else {
        $scmUrl = "$WebAppName.scm.azurewebsites.net";
    }
    # revert above
    return "https://$scmUrl";
}

function SyncWebApps($srcUrl, $srcCredentials, $destUrl, $destCredentials) {
    $syncOptions = New-Object Microsoft.Web.Deployment.DeploymentSyncOptions;
    #$syncOptions.DoNotDelete = $true;
    $appOfflineRule = $null;
    $availableRules = [Microsoft.Web.Deployment.DeploymentSyncOptions]::GetAvailableRules();
    if (!$availableRules.TryGetValue('AppOffline', [ref]$appOfflineRule)) {
        Write-Host "Failed to find AppOffline Rule";
    } else {
        $syncOptions.Rules.Add($appOfflineRule);
        Write-Host "Enabled AppOffline Rule";
    }
    
    $skipNewRelic = New-Object Microsoft.Web.Deployment.DeploymentSkipDirective -ArgumentList @("skipNewRelic", 'objectName=dirPath,absolutePath=.*\\newrelic', $true);

    $sourceBaseOptions = New-Object Microsoft.Web.Deployment.DeploymentBaseOptions;
    $sourceBaseOptions.ComputerName = $srcUrl + "/msdeploy.axd";
    $sourceBaseOptions.UserName = $srcCredentials.properties.PublishingUserName;
    $sourceBaseOptions.Password = $srcCredentials.properties.PublishingPassword;
    $sourceBaseOptions.AuthenticationType = "basic";
    $sourceBaseOptions.SkipDirectives.Add($skipNewRelic);

    $destBaseOptions = New-Object Microsoft.Web.Deployment.DeploymentBaseOptions;
    $destBaseOptions.ComputerName = $destUrl + "/msdeploy.axd";
    $destBaseOptions.UserName = $destCredentials.properties.PublishingUserName;
    $destBaseOptions.Password = $destCredentials.properties.PublishingPassword;
    $destBaseOptions.AuthenticationType = "basic";
    $destBaseOptions.SkipDirectives.Add($skipNewRelic);

    $destProviderOptions = New-Object Microsoft.Web.Deployment.DeploymentProviderOptions -ArgumentList @("contentPath");
    $destProviderOptions.Path = "/site";
    $sourceObj = [Microsoft.Web.Deployment.DeploymentManager]::CreateObject("contentPath", "/site", $sourceBaseOptions);
    $sourceObj.SyncTo($destProviderOptions, $destBaseOptions, $syncOptions); 
}

if($SubscriptionId) {
    try {
        Set-AzureRmContext -SubscriptionID $SubscriptionId;
    } catch {
    	Login-AzureRmAccount;
	    Set-AzureRmContext -SubscriptionID $SubscriptionId;
    }
}

$srcCreds = Get-AzureRmWebAppPublishingCredentials $ResourceGroupName $WebAppName;
$srcUrl = GetScmUrl $ResourceGroupName $WebAppName;
$destCreds = Get-AzureRmWebAppPublishingCredentials $ResourceGroupName $WebAppName $SlotName;
$destUrl = GetScmUrl $ResourceGroupName $WebAppName $SlotName;
SyncWebApps $srcUrl $srcCreds $destUrl $destCreds;