formula_installer: add fallback to use tap formula
The keg formula isn't present in some old bottles. Use the tap formula as a fallback when this is the case.
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@ -1056,9 +1056,11 @@ class FormulaInstaller
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# * Installing from a local bottle, or
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# * The formula doesn't exist in the tap (or the tap isn't installed), or
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# * The formula in the tap has a different pkg_version.
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#
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# In all other cases, including if the formula from the keg is unreadable
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# (third-party taps may `require` some of their own libraries), use the
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# formula from the tap.
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# (third-party taps may `require` some of their own libraries) or if there
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# is no formula present in the keg (as is the case with old bottles), use
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# the formula from the tap.
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formula_path = begin
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keg_formula_path = formula.opt_prefix/".brew/#{formula.name}.rb"
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tap_formula_path = formula.path
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@ -1073,7 +1075,7 @@ class FormulaInstaller
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else
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tap_formula_path
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end
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rescue FormulaUnreadableError
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rescue FormulaUnavailableError, FormulaUnreadableError
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tap_formula_path
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end
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