formula_installer: fix postinstall using incorrect formula file #15561
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In certain cases the wrong, resolved file path is used in the postinstall stage. Confusingly, when this happened postinstall would actually just be skipped silently without any warnings unless you had
--debug
so the issue was easy to miss and could have been an issue for some time.The build stage uses
specified_path
so the fix here is to be consistent with the rest of FormulaInstaller and do the same with postinstall.Fixes Homebrew/homebrew-core#130672.