Can't upload a file to AzDO repo when flow runs a second time

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Posted on by PaulinoV Microsoft Employee

Hi Power Users,

I'm building a flow that every time a new file is added to a Sharepoint it uploads it to an AzDO repository, I can manage it to run correctly one time, if I run the flow for a second time I get this error:

TF401028: The reference 'refs/heads/master' has already been updated by another client, so you cannot update it.

This is request I'm using:

If you have any corrections or insight I would like to read it.

Thanks in advance

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Building flows

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Expiscornovus 33,195 Most Valuable Professional on at

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Hi @PaulinoV,

Are you trying to add/commit the same file3.zip for the second time?

In the request the oldObjectId ref is 0000000000000000000000000000000000000000. After that request it would have a different id because it already exists (the newObjectId should be returned in the outputs). That is probably the reason why the second run is failing, because the oldObjectId is not 0000000000000000000000000000000000000000 anymore.

Alternatively, you might workaround this by generating a unique file name for the zip (you can use a utcNow function for that) every time you add the same file. Below is a sample expression:

concat('/', utcNow('yyyyMMddHHmm'), 'file3.zip')

Below is some documentation of Refs requests:

https://learn.microsoft.com/en-us/rest/api/azure/devops/git/refs/update-refs?view=azure-devops-rest-7.1&tabs=HTTP#create/update/delete-a-ref-by-repositoryid

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