"Failed to Unmarshall Output URL" Error on Successful Pulumi Update

[mickey0425]

What happened?

During the execution of a Pulumi update operation using a custom Go automation script, the process ends with an error message "Failed to unmarshall output URL", despite the Pulumi operation itself successfully creating, updating, and deleting resources. This issue leads to the Go automation script interpreting the entire operation as a failure, reflected by a non-zero exit code, which contradicts the successful execution of resource changes by Pulumi.

Example

Outputs:
  + stackOutput: {
      + cloudFront: {
          + distributions: {
              + dashboard: {
                  + cachePolicy: {
                      + dev-default-CdnCachePolicyCors: "bxxxxxef-9447-xxxxxxx-dfe6d4axxxxxx"
                    }
                  + id         : "xxxxxxxxxxx"
                }
            }
        }
      + s3        : {
          + buckets: {
              + liveconnect-dashboard-dev                 : {
                  + domain: "liveconnect-dashboard-dev.s3.ap-southeast-1.amazonaws.com"
                }
              + liveconnect-dashboard-dev-2024-01-25-16-39: {
                  + domain: "liveconnect-dashboard-dev-2024-01-25-16-39.s3.ap-southeast-1.amazonaws.com"
                }
            }
        }
    }

Resources:
    + 3 created
    ~ 1 updated
    4 changes. 9 unchanged

Duration: 4m32s

Update succeeded!
**Failed to unmarshall output URL**

Output of pulumi about

CLI          
Version      3.96.2
Go Version   go1.21.4
Go Compiler  gc

Host     
OS       ubuntu
Version  22.04
Arch     x86_64

Backend        
Name           pulumi.com
URL            https://app.pulumi.com
User           Unknown
Organizations  
Token type     personal

Additional context

No response

Contributing

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[julienp]

Hi @mickey0425, if you adapted one of the examples it is likely that the issue is towards the end of your main function. The examples read the output from the pulumi program like this:

	// get the URL from the stack outputs
	url, ok := res.Outputs["websiteUrl"].Value.(string)
	if !ok {
		fmt.Println("Failed to unmarshall output URL")
		os.Exit(1)
	}

(from the inline program example)

If you changed the name or types of the outputs of the pulumi program (what you pass to ctx.Export), you need to update the unmarshalling code to match it.

Could you please check if this is the cause here? If not, would it be possible to provide some code showing the failing output reading?

[mikhailshilkov]

Since we haven't heard back, I'll go ahead and close the issue as non-actionable. If the problem is still relevant, please provide further details as requested above.