Description

zerobrew fails to install sketchybar from the FelixKratz/formulae tap repository, but the main issue is that the original Ruby exception is returned directly to the user instead of being wrapped into a zerobrew-level error.

The original Homebrew setup guide uses a tap-first flow:

brew tap FelixKratz/formulae
brew install sketchybar

With zerobrew, the equivalent tap formula install was attempted as:

zb install felixkratz/formulae/sketchybar

The formula references Homebrew's MacOS constant, which is not available in the zerobrew shim/runtime. As a result, Ruby raises a raw NameError:

uninitialized constant Sketchybar::MacOS (NameError)

This raw exception leaks implementation details from the Ruby shim:

/opt/zerobrew/tmp/build/sketchybar/zerobrew_shim.rb:622:in `<main>'

Upstream Homebrew installation guide

brew tap FelixKratz/formulae
brew install sketchybar

Zerobrew command

zb install felixkratz/formulae/sketchybar

Actual behavior

The command fails with an unwrapped Ruby exception:

/opt/zerobrew/tmp/rb_cache/https:__raw.githubusercontent.com_felixkratz_homebrew-formulae_master_sketchybar.rb:24:in `install': uninitialized constant Sketchybar::MacOS (NameError)
	from /opt/zerobrew/tmp/build/sketchybar/zerobrew_shim.rb:622:in `<main>'

The same raw exception is repeated several times in the output.

Expected behavior

zerobrew should catch this kind of tap formula/shim failure and return a wrapped, user-facing error, for example:

Error: formula from tap FelixKratz/formulae uses unsupported Homebrew API: MacOS

or a more generic compatibility error:

Error: this tap formula is not compatible with zerobrew because it uses unsupported Homebrew Ruby APIs.

The original Ruby backtrace could still be available in debug/verbose mode, but should not be the primary error shown to the user.

Full output

==> Installing felixkratz/formulae/sketchybar...
==> Resolving dependencies (1 packages)...
    • sketchybar 2.23.0
==> Downloading and installing formulas...
/opt/zerobrew/tmp/rb_cache/https:__raw.githubusercontent.com_felixkratz_homebrew-formulae_master_sketchybar.rb:24:in `install': uninitialized constant Sketchybar::MacOS (NameError)
	from /opt/zerobrew/tmp/build/sketchybar/zerobrew_shim.rb:622:in `<main>'
==> Building sketchybar 2.23.0

Note: This package can't be installed with zerobrew.
      Error: source build failed (exit code: Some(1))
/opt/zerobrew/tmp/rb_cache/https:__raw.githubusercontent.com_felixkratz_homebrew-formulae_master_sketchybar.rb:24:in `install': uninitialized constant Sketchybar::MacOS (NameError)
	from /opt/zerobrew/tmp/build/sketchybar/zerobrew_shim.rb:622:in `<main>'

      Try installing with Homebrew instead:
      brew install felixkratz/formulae/sketchybar

error: source build failed (exit code: Some(1))
/opt/zerobrew/tmp/rb_cache/https:__raw.githubusercontent.com_felixkratz_homebrew-formulae_master_sketchybar.rb:24:in `install': uninitialized constant Sketchybar::MacOS (NameError)
	from /opt/zerobrew/tmp/build/sketchybar/zerobrew_shim.rb:622:in `<main>'

Notes

The install failure itself may be expected if MacOS is currently unsupported.

The bug is that the low-level Ruby NameError is exposed directly instead of being normalized into a clear zerobrew error for an unsupported tap formula.

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