How do I access the exit code of a heroku one-off dyno?

Question

I'm using heroku's platform API + the rendezvous client to execute a command and retrieve it's output + exit code.

def run_command(heroku_client, app_name, command)

  dyno = heroku_client.dyno.create(app_name, command: command, attach: true)



  rendezvous_url = dyno["attach_url"]



  rz = Rendezvous.new({

    input:StringIO.new,

    output:StringIO.new,

    url: rendezvous_url

  })



  rz.start # Blocks until the command completes



  rz.output.rewind

  rz.output.readlines.join

end

I can fetch the output just fine, as shown above. I can't find a way to access the exit code though. I tried fetching

dyno.info

from the API after the process has exited, but I get a

404

.

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Answer 1

Heroku doesn't support retrieving exit codes from a one-off dyno. One way to achieve this would be to use my_command; echo $? and then parse out the exit code manually. This gem has a plugin that does that.

How do I access the exit code of a heroku one-off dyno?

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