resource script (/opt/resource/out /tmp/build/put) output a null version

[kalrashubham49]

Summary

Custom Resource Not Working

Steps to reproduce

when trying to run a pipeline with below content out executable is not working

resource_types:
    - name: http-api
      type: docker-image
      source:
        repository: kalrashubham49/custom-http-resource
        tag: v2.2

resources:
      - name: clair
        type: http-api
        source:
            uri: http://45.33.90.33:8081/health
            method: GET
jobs:
      - name: test-http
        plan:
          - put: clair

Expected results

Actual results

Additional context

Triaging info

• Concourse version:
• Browser (if applicable):
• Did this used to work?

[jamieklassen]

tl;dr - please provide more details, as there's very little information to help with.

Converting to a discussion as we have no reproducible. It sounds like you're looking for advice on how to write a custom resource type, but to get meaningful help you're probably going to need to share:

• a reproducible concourse setup, ideally in the form of a docker-compose.yml file so that it's clear what version of concourse you're running and how it's configured.
• the code that runs in your kalrashubham49/custom-http-resource image. I looked around on your github profile but I didn't see anything obvious.

I'll mention https://concourse-ci.org/implementing-resource-types.html, but it seems like you've probably read that.

The error you're getting is from

concourse/atc/resource/resource_put.go

Line 36 in 248606d

return runtime.VersionResult{}, fmt.Errorf("resource script (%s %s) output a null version", spec.Path, strings.Join(spec.Args, " "))

which suggests that your /opt/resource/out script is printing valid JSON on stdout, but that JSON is supposed to have a structure like

{
  "version": { "ref": "61cebf" },
  "metadata": [
    { "name": "commit", "value": "61cebf" },
    { "name": "author", "value": "Mick Foley" }
  ]
}

In your case, when the output is parsed, the result has a null value for version. This suggests either that your script is outputting JSON like {"version":null} or more likely that your script is outputting JSON that doesn't have a version field at all.

EDIT: I just tried

$ echo '{"source":{"uri":"http://45.33.90.33:8081/health","method":"GET"}}' | docker run --rm kalrashubham49/custom-http-resource:v2.2 /opt/resource/out /tmp
{"ref":""}

which suggests pretty strongly that your script needs to be printing JSON with a version field in it.