Bicep 0.4.412 always writes to standard error

[afscrome]

Bicep version
Bicep CLI version 0.4.412 (f1169d0)

Describe the bug
In our pipeline, we build our bicep template before deploying it. We want to get behaviour similar to .Net's "Warning as Errors", so we've configured our task to fail if anything is written to standard error. This worked in previous bicep versions, however the latest bicep version has broken this as it appears to write the following text to standard error

WARNING: Build succeeded: 0 Warning(s), 0 Error(s)

To Reproduce
Have a devops task like the following, and attempt to build a valid bicep file. That task will error, even if bicep hasn't failed.

        - task: CmdLine@2
          displayName: 'Transpile Bicep Template'
          inputs:
            failOnStderr: true
            script: az bicep build --file '${{ parameters.bicepTemplate }}' --outfile '$(transpiledFileFullPath)'

Additional context
In #3285, I can see the recommendation is to look for Exit Code rather than look at standard error, but that a build with warnings still produces an exit code of 0.

Do you have an alternative recommendation for how to fail on warnings

[afscrome]

I've tried to mitigate this by downgrading to an older bicep version, however that now fails is it writes a helpful out of date warning to std error 😂

WARNING: A new Bicep release is available: v0.4.412. Upgrade now by running "az bicep upgrade".

[johan-lindqvist]

Having the same issue with Azure/arm-deploy and with the Azure CLI (Azure/arm-deploy#70 (comment))

[thesushil]

Same issue, my temporary workaround is to remove failOnStderr:true, not ideal!

[majastrz]

This is caused by the new build summary capability that was added in #3195. The AZ CLI and AZ PS have to be modified to pass the --no-summary switch.

[alex-frankel]

Can you try installing an older version in the meantime?

az bicep install --version v0.4.63

[afscrome]

@alex-frankel since the older version now writes an upgrade message to stderr so that is also broken

WARNING: A new Bicep release is available: v0.4.412. Upgrade now by running "az bicep upgrade".

[majastrz]

The version warning is coming from Az CLI and not from Bicep CLI, so we will need to deal with it separately. We will modify Bicep CLI to stop emitting the summary and cut a new release this week.

[majastrz]

New release with the fix should come by the end of this week (most likely sooner).

[afscrome]

My builds are working again with this morning's 0.4.451 release. Thanks @majastrz for the quick turn around.

[majastrz]

np - glad it's working now.