Run a command if either of two preconditions is true?

[quentinsf]

I'd like to be able to run a deployment only if EITHER:

• A. The working directory is a clean checkout from git, OR
• B. The variable ALLOW_UNCLEAN is set to 1

(I'd be happy with alternatives to the second one, like having to confirm at a prompt that I really want to go ahead.)

I can specify either of these as a precondition just fine, but if I specify both of them, then they both have to be true.

Is there a good way to do OR, instead of AND, other than combining them both into a complex shell expression?

Instead of using precinditions, I wondered about something like making the deployment task DEPEND on a checking task which normally would run the git test but would use a 'status' clause to check whether it needs to, by looking at the environment variable. I think that might work, but wondered if that was the best way! It might not be very self-explanatory.

[quentinsf]

Well, I decided in the end just to use the shell to do the 'OR'.

Each task depends on a 'prompt-if-dirty' task. This only runs a prompt asking for confirmation, but it has a 'status' clause saying that it doesn't need to do that if either the working directory is clean or the variable is set:

  prompt-if-dirty:
    desc:  Check if the git repository is clean and prompt if not.
    prompt: The working directory isn't clean - really continue?
    run: once
    internal: true
    silent: true
    status:
      - test "${ALLOW_UNCLEAN}" == "1" || test -z "$(git status --porcelain)"

That'll do for now.