install: add workaround for rosetta2 path error to msg

[dcow]

It's possible the user's terminal emulator is running under rosetta2.
Consequently, the i86_64 version of the ruby interpreter will be used.
Likely, the right thing to do is simply install the arm64 version of the
requested package. This can be accomplished using: arch -arm64 brew ...

Fixes: #10313

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes? Here's an example.
• Have you successfully run brew style with your changes locally?
• Have you successfully run brew typecheck with your changes locally?
• Have you successfully run brew tests with your changes locally?

  There were numerous failures...

• Have you successfully run brew man locally and committed any changes?

  Failure: Broken pipe

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Please help direct me to the right tests (if necessary). Also, I'm unable to test this because it does no appear that brew cares about the prefix when it's not in /opt or /usr. When I run arch -x86_64 brew install ... it completes successfully and does not complain. Is there a way to instruct brew to care so I can hit the codepath?

[MikeMcQuaid]

Thanks for the PR. Looks good so far!

[dcow]

@MikeMcQuaid let me know how you like the new prose. Thinking about it now, I wonder if we should but the more hand-holdy explanation in the brew doctor output and keep it terse in install.rb. Happy to keep moving things around and rewriting.

Also, I'm unable to test this because it does no appear that brew cares about the prefix when it's not in /opt or /usr. When I run arch -x86_64 bin/brew install ... it completes successfully and does not complain. Is there a way to instruct brew to care so I can hit the codepath?

[MikeMcQuaid]

Also, I'm unable to test this because it does no appear that brew cares about the prefix when it's not in /opt or /usr. When I run arch -x86_64 bin/brew install ... it completes successfully and does not complain. Is there a way to instruct brew to care so I can hit the codepath?

You'll need to install into the expected location to hit that codepath (or temporarily edit code elsewhere to match whatever prefix you're using).

[MikeMcQuaid]

Thanks so much for your first contribution! Without people like you submitting PRs we couldn't run this project. You rock, @dcow!