rules:
  - id: set-pipefail
    languages: [dockerfile]
    message: >-
      Only the exit code from the final command in this RUN instruction will be evaluated unless 'pipefail' is set.
      If you want to fail the command at any stage in the pipe, set 'pipefail' by including 'SHELL ["/bin/bash", "-o", "pipefail", "-c"] before the command.
      If you're using alpine and don't have bash installed, communicate this explicitly with `SHELL ["/bin/ash"]`.
    metadata:
      references:
        - https://github.com/hadolint/hadolint/wiki/DL4006
      source-rule-url: https://github.com/hadolint/hadolint/wiki/DL4006
      category: best-practice
      technology:
        - dockerfile
    patterns:
      - pattern-either:
          - pattern: RUN ... | ...
          - pattern: RUN ... || ...
      - pattern-not-inside: |
          SHELL [..., "pipefail", ...]
          ...
          RUN ... | ...
      - pattern-not-inside: |
          SHELL ["/bin/ash", ...]
          ...
          RUN ... | ...
    severity: WARNING