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I made an Azure Powershell function that needs to write some data into a blob, so am using an outputBlob binding along with:

Push-OutputBinding -Name <name> -Value <value>

That writes the data I need into the blob - great! But the issue is that every time the function runs it overwrites the blob content. I cannot see how to get the Push-OutputBinding cmdlet to append data into the blob, rather than 'set' it. I have tried setting the -Clobber switch, but it doesn't seem to make any difference.

Bindings seem like a nice way to interact with Blob storage without having to pull in more code to instantiate a more full-on client session, I hope this is possible? Would appreciate any pointers.

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4 Answers 4

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I'm reasonably confident there is no native way to append to a blob in powershell and in the output binding of an azure function, so you'd have to code for that (also, i think the only way to append to block blob is to download the content and append locally and reupload, but I'm not sure about this one).

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Understood. Thanks for clarifying.
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As 4c74356b41 said, there is no native way to append to a blob in powershell.

But you don't need to download the content to a file locally, $storageBlob.ICloudBlob.DownloadText() can be used to download.

Following is my test code to append "123456789" to the Blob:

$connctionstring = ""
$container = ""
$blob = ""
$appendText = "123456789"

$blobContext = New-AzureStorageContext -ConnectionString $connctionstring
$storageBlob = Get-AzureStorageBlob -Blob $blob -Container $container -Context $blobContext 

$storageBlobContent = $storageBlob.ICloudBlob.DownloadText()

$storageBlobContent

$storageBlob.ICloudBlob.UploadText($storageBlobContent + $appendText)

enter image description here

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Nice solution. Very helpful!
wdym "you don't need to download the content locally" - when you download it, lol. you dont have to save it to a file and do that in memory - sure. but you have to download it.
Yes, it will download to memory. I mean "you don't need to download the content locally" as a file. I will edit it.
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Create an Append blob using powershell command Set-AzStorageBlobContent with blob type Append

$storageAccountName = ""
$containerName= ""
$storageContext= ""
$blobName = ""
$appendText = "123456789"

$storageContext = New-AzStorageContext -StorageAccountName $storageAccountName -StorageAccountKey $AccountKey
$patchContainer = Get-AzStorageContainer -Name $containerName -Context $storageContext
$storageBlob = Get-AzStorageBlob -Blob $blobName -Container $containerName -Context $storageContext 
$patchLogBlob = Get-AzStorageBlob -Blob $blobName -Container $containerName -Context $storageContext                         
$patchLogBlob.ICloudBlob.AppendText($appendText)
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You mention using Set-AzStorageBlobContent in the first part of your solution, but that commandlet doesn't appear in the code sample. Is there missing code from your example?
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It seems, there's no necessity neither to create a new StorageContext nor to Get a new storage blob, all you need to do is to get the blob object and correctly call it's interface method.

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