Azure Automation:存储帐户之间blob拷贝

在两个存储帐户之间进行blob拷贝，在客户端，使用Azue PowerShell脚本， 用存储帐户上下文（New-AzureStorageContext）来获取某个StorageAccount中的Container。进而，我们想使用Azure Portal的自动化(Automation), 在Runbook中运行同样的脚本，就出现了如下的错误：

5/25/2015 9:49:19 AM, Error: Get-AzureStorageContainer : Cannot bind parameter 'Context'. Cannot convert the
"Microsoft.WindowsAzure.Commands.Common.Storage.AzureStorageContext" value of type
"Deserialized.Microsoft.WindowsAzure.Commands.Common.Storage.AzureStorageContext" to type
"Microsoft.WindowsAzure.Commands.Common.Storage.AzureStorageContext".
At storageAccountCopy:28 char:28

从网上查询问题原因，有人说是这样的，即Automation中运行的是PowerShell Workflow,其中返回的类型是deserialized, 而在PowerShell中返回的类型是非deserialized，所以你不能将Deserialized类型的AzueStorageContext转换为AzureStorageContext：解决方法是在脚本中使用关键字InlineScript包裹这些代码，使得他们仍然返回AzureStorageContext，而不是PowerShell Workflow中默认的Deserialized AzureStorageContext.

原话如下：

This is due to PowerShell Workflow returning values in deserialized form. See http://social.msdn.microsoft.com/Forums/windowsazure/en-US/1adec597-964c-402e-b1f1-b195d00a20be/exception-calling-azureprovisioningconfig?forum=azureautomation for more details.

The workaround is to just use an InlineScript within the workflow to run these commands in the PowerShell context instead of the PowerShell Workflow context.

示例代码如下：（这段代码所实现的是在同一个Subscription中，将源存储帐户中的blob文件拷贝到目标存储帐户中）

workflow storageAccountCopy
{
#Script by LeX (Qijie Xue)
#sign in Azure Subscription
$Credential = Get-AutomationPSCredential -Name "PSCredential"
$SubscriptionName = Get-AutomationVariable -Name "SubscriptionName"

#connect to Azure using PowerShell Credential
Add-AzureAccount -Credential $Credential

#Select the Azure subscription to use in this workflow
Select-AzureSubscription -SubscriptionName $SubscriptionName

inlinescript{
#source Storage Account
$srcStorageAccountName = ""
$srcStorageKey=""

#target Storage Account
$trgStorageAccountName=""
$trgStorageKey =""

# storage context, source and target
$srcContext = New-AzureStorageContext -StorageAccountName $srcStorageAccountName -StorageAccountKey $srcStorageKey
$trgContext = New-AzureStorageContext -StorageAccountName $trgStorageAccountName -StorageAccountKey $trgStorageKey

# all containers in source Storage Account
$containers = Get-AzureStorageContainer -Context $srcContext
ForEach($container in $containers)
{
    $trgContainers = Get-AzureStorageContainer -Context $trgContext
    $exists=0
    ForEach($item in $trgContainers)
    {
        if($item.Name -eq $container.Name)
        {
            $exists=1
        }
    }
    if($exists -eq 0)
    {
         New-AzureStorageContainer $container.Name -Permission Container -Context $trgContext
    }   

    # do the copy blob for the current container
    $blobs = Get-AzureStorageBlob -Container $container.Name -Context $srcContext
    $blobs | Start-AzureStorageBlobCopy -DestContainer $container.Name -DestContext $trgContext -Force
}
}
}