Merge pull request #20992 from Homebrew/source-build-postinstall-from-keg

formula_installer: use formula from keg when post-installing source builds

Author: MikeMcQuaid

Library/Homebrew/formula_installer.rb

@@ -1313,6 +1313,7 @@ def post_install_formula_path
     # Use the formula from the keg when any of the following is true:
     # * We're installing from the JSON API
     # * We're installing a local bottle file
+    # * We're building from source
     # * The formula doesn't exist in the tap (or the tap isn't installed)
     # * The formula in the tap has a different `pkg_version``.
     #
@@ -1323,6 +1324,7 @@ def post_install_formula_path
     keg_formula_path = formula.opt_prefix/".brew/#{formula.name}.rb"
     return keg_formula_path if formula.loaded_from_api?
     return keg_formula_path if formula.local_bottle_path.present?
+    return keg_formula_path if build_from_source?
 
     tap_formula_path = T.must(formula.specified_path)
     return keg_formula_path unless tap_formula_path.exist?

Library/Homebrew/utils/path.rb

@@ -24,10 +24,6 @@ def self.loadable_package_path?(path, package_type)
       else
         "#{Cask::Caskroom.path}/"
       end
-      unless Homebrew::EnvConfig.no_install_from_api?
-        require "api"
-        allowed_paths << "#{Homebrew::API::HOMEBREW_CACHE_API_SOURCE}/"
-      end
 
       return true if !path_realpath.end_with?(".rb") && !path_string.end_with?(".rb")
       return true if allowed_paths.any? { |path| path_realpath.start_with?(path) }