Troubleshooting

With any porter error, it can really help to re-run the command again with the --debug flag.

mapping values are not allowed in this context

When you run your bundle you see the following error

executing install action from HELLO (bundle instance: HELLO)
=== Step Data ===
map[bundle:map[credentials:map[] dependencies:map[] description:An example Porter configuration images:map[] invocationImage:porter-hello:latest name:HELLO outputs:map[] parameters:map[test:{"test": "test"}] version:0.1.0]]
=== Step Template ===
exec:
  command: bash
  description: Install Hello World
  flags:
    c: echo '{{ bundle.parameters.test }}'

=== Rendered Step ===
exec:
  command: bash
  description: Install Hello World
  flags:
    c: echo '{"test": "value"}'

Error: unable to resolve step: invalid step yaml
exec:
  command: bash
  description: Install Hello World
  flags:
    c: echo '{"test": "value"}'
: yaml: line 5: mapping values are not allowed in this context

Right now Porter doesn’t preserve the wrapping quotes around mapping values, so if you have lines that contain a colon followed by a space : or a hash # preceeded by a space, then things will get tricky. If you can remove the space, or wrap the entire line in an extra quote, that should workaround the problem.

before

parameters:
- name: test
  description: test
  type: string
  default: '{"test": "value"}'

install:
  - exec:
      description: "Install Hello World"
      command: bash
      flags:
        c: "echo {{ bundle.parameters.test}}"

after

Remove the extra space after the colon when defining the test parameter’s default

parameters:
- name: test
  description: test
  type: string
  default: '{"test":"value"}'

install:
  - exec:
      description: "Install Hello World"
      command: bash
      flags:
        c: "echo {{ bundle.parameters.test}}"

you see apt errors when you use a custom Dockerfile

When you use a custom Dockerfile you see apt errors even though you did not use apt in your Dockerfile. This is because Porter assumes a debian-based base image that has apt available. Many of the mixins use apt to install the dependencies and the binary that they shim.

Starting Invocation Image Build =======>
Error: unable to build CNAB invocation image: failed to stream docker build output: The command '/bin/sh -c apt-get update && apt-get install -y apt-transport-https curl && curl -o kubectl https://storage.googleapis.com/kubernetes-release/release/v1.15.5/bin/linux/amd64/kubectl && mv kubectl /usr/local/bin && chmod a+x /usr/local/bin/kubectl' returned a non-zero code: 127

For now you must base your custom Dockerfile on debian or ubuntu.