Cannot use Databricks REST API for secrets "get" inside bash script (byte format only)

[m997al]

Hi,

I am trying to use Databricks-backed secret scopes inside Azure DevOps pipelines.  I am almost successful.

I can use the REST API to "get" a secret value back inside my bash script, but, the value is in byte format, so it is unusable as a local variable in my script (for other logins, etc.)

I know that dbutils can be used inside Databricks notebooks, but that is not my use case here.  I want to use the secrets from the Databricks-backed secret scopes as key vaults that I can access from inside my ADO pipeline yaml files.

Does anyone know what the solution might be?

[m997al]

Hi - I think I have discovered the issue.  In my bash script in the ADO pipeline, I tried to assign the value from the "get" to a local variable in the yaml file, for example:

$secret_val=$(<get secret from Databricks scope via REST API>)
<another external REST API call to a non-Databricks service, using bearer: $secret_val>

But this should work (I have seen it work elsewhere):

<another external REST API call to a non-Databricks service, using bearer: $(get secret from Databricks scope vai REST API)>

...i.e., you have to use the secret on-the-fly, rather than assign it to a variable and use the secondary variable.

Thanks!

[m997al]

I wanted to add an addendum to this.  So in Azure DevOps, when working with yaml files, you can use the Azure DevOps pipelines "Library" to load environment variables.  When you look at those environment variables, in the Azure DevOps pipeline library, there is a way to "lock" the variable so that it is not plain-text (and thus masked by asterisks so that no one else with access to the library can see it).

Where is this going?  So it turns out (and this is all Azure DevOps pipelines thus far we are talking about) that when a pipeline library variable is masked, it can only be used in the yaml file "on-the-fly"...meaning you cannot assign the environment variable to another local yaml file variable, such as "mytempvar=$(library_masked_variable)"... 

That will not work as "$mytempvar" will just be encrypted and unuseable.

I think the same thing is going on with secrets that are pulled from a Databricks secret scope and used inside Azure DevOps pipeline yaml files.  This might have more to do with Azure DevOps and the way it processes bash scripting in yaml files than it does with anything about Azure Databricks secret scopes and the REST API.

Hope that helps.