Merge branch 'master' into mohammad

.github/workflows/tests.yml

@@ -107,7 +107,6 @@ jobs:
           brew tap homebrew/cask-versions
           brew tap homebrew/command-not-found
           brew tap homebrew/formula-analytics
-          brew tap homebrew/linux-dev
           brew tap homebrew/portable-ruby
           brew tap homebrew/services
 
@@ -136,7 +135,6 @@ jobs:
                                          homebrew/autoupdate\
                                          homebrew/command-not-found \
                                          homebrew/formula-analytics \
-                                         homebrew/linux-dev \
                                          homebrew/portable-ruby
 
       - name: Run brew style on cask taps

.github/workflows/triage.yml

@@ -23,7 +23,7 @@ jobs:
     steps:
       - name: Re-run this workflow
         if: github.event_name == 'schedule' || github.event.action == 'closed'
-        uses: reitermarkus/rerun-workflow@cd46218e13bd336b1c551c6ef4dc82aa5316facf
+        uses: reitermarkus/rerun-workflow@c8d5bc3526acb50c12004f31c0dcb1598c87e32d
         with:
           token: ${{ secrets.HOMEBREW_GITHUB_PUBLIC_REPO_TOKEN }}
           continuous-label: waiting for feedback
@@ -35,7 +35,7 @@ jobs:
             github.event.action != 'closed' && github.event.pull_request.state != 'closed'
         uses: actions/github-script@v6
         with:
-          github-token: ${{ secrets.HOMEBREW_GITHUB_PUBLIC_REPO_TOKEN }}
+          github-token: ${{ secrets.HOMEBREW_BREW_TRIAGE_PULL_REQUESTS_TOKEN }}
           script: |
             async function approvePullRequest(pullRequestNumber) {
               const reviews = await approvalsByAuthenticatedUser(pullRequestNumber)

Library/.rubocop.yml

@@ -13,6 +13,7 @@ inherit_mode:
 AllCops:
   TargetRubyVersion: 2.6
   DisplayCopNames: false
+  ActiveSupportExtensionsEnabled: true
   # enable all pending rubocops
   NewCops: enable
   Include:
@@ -97,7 +98,7 @@ Naming/InclusiveLanguage:
         - "patches/13_fix_scope_for_show_slave_status_data.patch" # Used in formula `mytop`
 
 Naming/MethodName:
-  IgnoredPatterns:
+  AllowedPatterns:
     - '\A(fetch_)?HEAD\?\Z'
 
 # Both styles are used depending on context,
@@ -122,6 +123,14 @@ Style/BarePercentLiterals:
 Style/CollectionMethods:
   Enabled: true
 
+# This is quite a large change, so don't enforce this yet for formulae.
+# We should consider doing so in the future, but be aware of the impact on third-party taps.
+Style/FetchEnvVar:
+  Exclude:
+    - "Taps/*/*/*.rb"
+    - "/**/Formula/*.rb"
+    - "**/Formula/*.rb"
+
 # Prefer tokens with type annotations for consistency
 # between formatting numbers and strings.
 Style/FormatStringToken:
@@ -389,7 +398,7 @@ Naming/MethodParameterName:
 Layout/LineLength:
   Max: 118
   # ignore manpage comments and long single-line strings
-  IgnoredPatterns:
+  AllowedPatterns:
     [
       "#: ",
       ' url "',

Library/Homebrew/Gemfile.lock

@@ -35,6 +35,7 @@ GEM
       domain_name (~> 0.5)
     i18n (1.10.0)
       concurrent-ruby (~> 1.0)
+    json (2.6.2)
     json_schemer (0.2.21)
       ecma-re-validator (~> 0.3)
       hana (~> 1.3)
@@ -56,7 +57,7 @@ GEM
       mime-types-data (~> 3.2015)
     mime-types-data (3.2022.0105)
     mini_portile2 (2.8.0)
-    minitest (5.16.0)
+    minitest (5.16.1)
     msgpack (1.5.2)
     mustache (1.1.1)
     net-http-digest_auth (1.4.1)
@@ -66,7 +67,7 @@ GEM
       mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
     parallel (1.22.1)
-    parallel_tests (3.11.0)
+    parallel_tests (3.11.1)
       parallel
     parlour (8.0.0)
       commander (~> 4.5)
@@ -123,13 +124,14 @@ GEM
       rspec (>= 3, < 4)
     rspec_junit_formatter (0.5.1)
       rspec-core (>= 2, < 4, != 2.12.0)
-    rubocop (1.27.0)
+    rubocop (1.31.1)
+      json (~> 2.3)
       parallel (~> 1.10)
       parser (>= 3.1.0.0)
       rainbow (>= 2.2.2, < 4.0)
       regexp_parser (>= 1.8, < 3.0)
-      rexml
+      rexml (>= 3.2.5, < 4.0)
-      rubocop-ast (>= 1.16.0, < 2.0)
+      rubocop-ast (>= 1.18.0, < 2.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 3.0)
     rubocop-ast (1.18.0)
@@ -137,13 +139,13 @@ GEM
     rubocop-performance (1.14.2)
       rubocop (>= 1.7.0, < 2.0)
       rubocop-ast (>= 0.4.0)
-    rubocop-rails (2.15.0)
+    rubocop-rails (2.15.1)
       activesupport (>= 4.2.0)
       rack (>= 1.1)
       rubocop (>= 1.7.0, < 2.0)
     rubocop-rspec (2.11.1)
       rubocop (~> 1.19)
-    rubocop-sorbet (0.6.8)
+    rubocop-sorbet (0.6.10)
       rubocop (>= 0.90.0)
     ruby-macho (3.0.0)
     ruby-progressbar (1.11.0)
@@ -157,14 +159,14 @@ GEM
       simplecov (~> 0.19)
     simplecov-html (0.12.3)
     simplecov_json_formatter (0.1.4)
-    sorbet (0.5.10097)
+    sorbet (0.5.10132)
-      sorbet-static (= 0.5.10097)
+      sorbet-static (= 0.5.10132)
-    sorbet-runtime (0.5.10097)
+    sorbet-runtime (0.5.10132)
     sorbet-runtime-stub (0.2.0)
-    sorbet-static (0.5.10097-universal-darwin-14)
+    sorbet-static (0.5.10132-universal-darwin-14)
-    sorbet-static-and-runtime (0.5.10097)
+    sorbet-static-and-runtime (0.5.10132)
-      sorbet (= 0.5.10097)
+      sorbet (= 0.5.10132)
-      sorbet-runtime (= 0.5.10097)
+      sorbet-runtime (= 0.5.10132)
     spoom (1.1.11)
       sorbet (>= 0.5.9204)
       sorbet-runtime (>= 0.5.9204)
@@ -184,7 +186,7 @@ GEM
     unf (0.1.4)
       unf_ext
     unf_ext (0.0.8.2)
-    unicode-display_width (2.1.0)
+    unicode-display_width (2.2.0)
     unparser (0.6.4)
       diff-lcs (~> 1.3)
       parser (>= 3.1.0)

Library/Homebrew/brew.rb

@@ -11,35 +11,14 @@ raise "HOMEBREW_BREW_FILE was not exported! Please call bin/brew directly!" unle
 std_trap = trap("INT") { exit! 130 } # no backtrace thanks
 
 # check ruby version before requiring any modules.
-unless ENV["HOMEBREW_REQUIRED_RUBY_VERSION"]
+REQUIRED_RUBY_X, REQUIRED_RUBY_Y, = ENV.fetch("HOMEBREW_REQUIRED_RUBY_VERSION").split(".").map(&:to_i)
-  raise "HOMEBREW_REQUIRED_RUBY_VERSION was not exported! Please call bin/brew directly!"
-end
-
-REQUIRED_RUBY_X, REQUIRED_RUBY_Y, = ENV["HOMEBREW_REQUIRED_RUBY_VERSION"].split(".").map(&:to_i)
 RUBY_X, RUBY_Y, = RUBY_VERSION.split(".").map(&:to_i)
 if RUBY_X < REQUIRED_RUBY_X || (RUBY_X == REQUIRED_RUBY_X && RUBY_Y < REQUIRED_RUBY_Y)
   raise "Homebrew must be run under Ruby #{REQUIRED_RUBY_X}.#{REQUIRED_RUBY_Y}! " \
         "You're running #{RUBY_VERSION}."
 end
 
-# Also define here so we can rescue regardless of location.
+require_relative "global"
-class MissingEnvironmentVariables < RuntimeError; end
-
-begin
-  require_relative "global"
-rescue MissingEnvironmentVariables => e
-  raise e if ENV["HOMEBREW_MISSING_ENV_RETRY"]
-
-  if ENV["HOMEBREW_DEVELOPER"]
-    $stderr.puts <<~EOS
-      Warning: #{e.message}
-      Retrying with `exec #{ENV["HOMEBREW_BREW_FILE"]}`!
-    EOS
-  end
-
-  ENV["HOMEBREW_MISSING_ENV_RETRY"] = "1"
-  exec ENV["HOMEBREW_BREW_FILE"], *ARGV
-end
 
 begin
   trap("INT", std_trap) # restore default CTRL-C handler
@@ -74,8 +53,8 @@ begin
   args = Homebrew::CLI::Parser.new.parse(ARGV.dup.freeze, ignore_invalid_options: true)
   Context.current = args.context
 
-  path = PATH.new(ENV["PATH"])
+  path = PATH.new(ENV.fetch("PATH"))
-  homebrew_path = PATH.new(ENV["HOMEBREW_PATH"])
+  homebrew_path = PATH.new(ENV.fetch("HOMEBREW_PATH"))
 
   # Add shared wrappers.
   path.prepend(HOMEBREW_SHIMS_PATH/"shared")
@@ -107,6 +86,10 @@ begin
   end
 
   if internal_cmd || Commands.external_ruby_v2_cmd_path(cmd)
+    if Commands::INSTALL_FROM_API_FORBIDDEN_COMMANDS.include?(cmd) && Homebrew::EnvConfig.install_from_api?
+      odie "This command cannot be run while HOMEBREW_INSTALL_FROM_API is set!"
+    end
+
     Homebrew.send Commands.method_name(cmd)
   elsif (path = Commands.external_ruby_cmd_path(cmd))
     require?(path)

Library/Homebrew/brew.sh

@@ -734,7 +734,7 @@ then
 fi
 export HOMEBREW_BREW_GIT_REMOTE
 
-HOMEBREW_CORE_DEFAULT_GIT_REMOTE="https://github.com/Homebrew/homebrew-core"
+export HOMEBREW_CORE_DEFAULT_GIT_REMOTE="https://github.com/Homebrew/homebrew-core"
 if [[ -z "${HOMEBREW_CORE_GIT_REMOTE}" ]]
 then
   HOMEBREW_CORE_GIT_REMOTE="${HOMEBREW_CORE_DEFAULT_GIT_REMOTE}"
@@ -748,34 +748,6 @@ then
   export HOMEBREW_DEVELOPER_COMMAND="1"
 fi
 
-# Set HOMEBREW_DEVELOPER_MODE if this command will turn (or keep) developer mode on. This is the case if:
-# - The command being run is not `brew developer off`
-# - Any of the following are true
-#   - HOMEBREW_DEVELOPER is set
-#   - HOMEBREW_DEV_CMD_RUN is set
-#   - A developer command is being run
-#   - The command being run is `brew developer on`
-if [[ "${HOMEBREW_COMMAND}" != "developer" || ! $* =~ "off" ]] &&
-   [[ -n "${HOMEBREW_DEVELOPER}" ||
-      -n "${HOMEBREW_DEV_CMD_RUN}" ||
-      -n "${HOMEBREW_DEVELOPER_COMMAND}" ||
-      "${HOMEBREW_COMMAND}" == "developer" && $* =~ "on" ]]
-then
-  export HOMEBREW_DEVELOPER_MODE="1"
-fi
-
-if [[ -n "${HOMEBREW_INSTALL_FROM_API}" && -n "${HOMEBREW_DEVELOPER_COMMAND}" && "${HOMEBREW_COMMAND}" != "irb" ]]
-then
-  odie "Developer commands cannot be run while HOMEBREW_INSTALL_FROM_API is set!"
-elif [[ -n "${HOMEBREW_INSTALL_FROM_API}" && -n "${HOMEBREW_DEVELOPER_MODE}" ]]
-then
-  message="Developers should not have HOMEBREW_INSTALL_FROM_API set!
-Please unset HOMEBREW_INSTALL_FROM_API or turn developer mode off by running:
-  brew developer off
-"
-  opoo "${message}"
-fi
-
 if [[ -n "${HOMEBREW_DEVELOPER_COMMAND}" && -z "${HOMEBREW_DEVELOPER}" ]]
 then
   if [[ -z "${HOMEBREW_DEV_CMD_RUN}" ]]

Library/Homebrew/cask/artifact/abstract_uninstall.rb

@@ -106,7 +106,7 @@ module Cask
               +"/Library/LaunchAgents/#{service}.plist",
               +"/Library/LaunchDaemons/#{service}.plist",
             ]
-            paths.each { |elt| elt.prepend(ENV["HOME"]).freeze } unless with_sudo
+            paths.each { |elt| elt.prepend(Dir.home).freeze } unless with_sudo
             paths = paths.map { |elt| Pathname(elt) }.select(&:exist?)
             paths.each do |path|
               command.run!("/bin/rm", args: ["-f", "--", path], sudo: with_sudo)

Library/Homebrew/cask/artifact/installer.rb

@@ -39,7 +39,7 @@ module Cask
             executable_path,
             **args,
             env: { "PATH" => PATH.new(
-              HOMEBREW_PREFIX/"bin", HOMEBREW_PREFIX/"sbin", ENV["PATH"]
+              HOMEBREW_PREFIX/"bin", HOMEBREW_PREFIX/"sbin", ENV.fetch("PATH")
             ) },
           )
         end

Library/Homebrew/cask/artifact/relocated.rb

@@ -96,7 +96,7 @@ module Cask
       end
 
       def printable_target
-        target.to_s.sub(/^#{ENV['HOME']}(#{File::SEPARATOR}|$)/, "~/")
+        target.to_s.sub(/^#{Dir.home}(#{File::SEPARATOR}|$)/, "~/")
       end
     end
   end

Library/Homebrew/cask/audit.rb

@@ -308,6 +308,7 @@ module Cask
     LIVECHECK_REFERENCE_URL = "https://docs.brew.sh/Cask-Cookbook#stanza-livecheck"
 
     def check_hosting_with_livecheck(livecheck_result:)
+      return if cask.discontinued? || cask.version.latest?
       return if block_url_offline? || cask.appcast || cask.livecheckable?
       return if livecheck_result == :auto_detected
 
@@ -315,7 +316,6 @@ module Cask
 
       case cask.url.to_s
       when %r{sourceforge.net/(\S+)}
-        return if cask.version.latest?
         return unless online?
 
         add_error "Download is hosted on SourceForge, #{add_livecheck}"

Library/Homebrew/cask/cask.rb

@@ -6,6 +6,7 @@ require "cask/config"
 require "cask/dsl"
 require "cask/metadata"
 require "searchable"
+require "utils/bottles"
 
 module Cask
   # An instance of a cask.
@@ -20,7 +21,7 @@ module Cask
 
     attr_reader :token, :sourcefile_path, :source, :config, :default_config
 
-    attr_accessor :download
+    attr_accessor :download, :allow_reassignment
 
     def self.all
       Tap.flat_map(&:cask_files).map do |f|
@@ -38,11 +39,12 @@ module Cask
       @tap
     end
 
-    def initialize(token, sourcefile_path: nil, source: nil, tap: nil, config: nil, &block)
+    def initialize(token, sourcefile_path: nil, source: nil, tap: nil, config: nil, allow_reassignment: false, &block)
       @token = token
       @sourcefile_path = sourcefile_path
       @source = source
       @tap = tap
+      @allow_reassignment = allow_reassignment
       @block = block
 
       @default_config = config || Config.new
@@ -57,6 +59,10 @@ module Cask
     def config=(config)
       @config = config
 
+      refresh
+    end
+
+    def refresh
       @dsl = DSL.new(self)
       return unless @block
 
@@ -88,7 +94,7 @@ module Cask
         version_os_hash = {}
         actual_version = MacOS.full_version.to_s
 
-        MacOS::Version::SYMBOLS.each do |os_name, os_version|
+        MacOSVersions::SYMBOLS.each do |os_name, os_version|
           MacOS.full_version = os_version
           cask = CaskLoader.load(token)
           version_os_hash[os_name] = cask.version if cask.version != version
@@ -213,7 +219,7 @@ module Cask
     end
     alias == eql?
 
-    def to_h
+    def to_hash
       {
         "token"          => token,
         "full_token"     => full_name,
@@ -237,11 +243,47 @@ module Cask
       }
     end
 
+    def to_h
+      hash = to_hash
+      variations = {}
+
+      hash_keys_to_skip = %w[outdated installed versions]
+
+      if @dsl.on_system_blocks_exist?
+        [:arm, :intel].each do |arch|
+          MacOSVersions::SYMBOLS.each_key do |os_name|
+            # Big Sur is the first version of macOS that supports arm
+            next if arch == :arm && MacOS::Version.from_symbol(os_name) < MacOS::Version.from_symbol(:big_sur)
+
+            Homebrew::SimulateSystem.os = os_name
+            Homebrew::SimulateSystem.arch = arch
+
+            refresh
+
+            bottle_tag = ::Utils::Bottles::Tag.new(system: os_name, arch: arch).to_sym
+            to_hash.each do |key, value|
+              next if hash_keys_to_skip.include? key
+              next if value.to_s == hash[key].to_s
+
+              variations[bottle_tag] ||= {}
+              variations[bottle_tag][key] = value
+            end
+          end
+        end
+      end
+
+      Homebrew::SimulateSystem.clear
+      refresh
+
+      hash["variations"] = variations
+      hash
+    end
+
     private
 
     def to_h_string_gsubs(string)
       string.to_s
-            .gsub(ENV["HOME"], "$HOME")
+            .gsub(Dir.home, "$HOME")
             .gsub(HOMEBREW_PREFIX, "$(brew --prefix)")
     end
 

Library/Homebrew/cask/cask_loader.rb

@@ -217,14 +217,17 @@ module Cask
         next unless loader_class.can_load?(ref)
 
         if loader_class == FromTapLoader && Homebrew::EnvConfig.install_from_api? &&
-           ref.start_with?("homebrew/cask/") && !Tap.fetch("homebrew/cask").installed? &&
+           ref.start_with?("homebrew/cask/") && Homebrew::API::CaskSource.available?(ref)
-           Homebrew::API::CaskSource.available?(ref)
           return FromContentLoader.new(Homebrew::API::CaskSource.fetch(ref))
         end
 
         return loader_class.new(ref)
       end
 
+      if Homebrew::EnvConfig.install_from_api? && Homebrew::API::CaskSource.available?(ref)
+        return FromContentLoader.new(Homebrew::API::CaskSource.fetch(ref))
+      end
+
       return FromTapPathLoader.new(default_path(ref)) if FromTapPathLoader.can_load?(default_path(ref))
 
       case (possible_tap_casks = tap_paths(ref)).count
@@ -233,14 +236,7 @@ module Cask
       when 2..Float::INFINITY
         loaders = possible_tap_casks.map(&FromTapPathLoader.method(:new))
 
-        raise CaskError, <<~EOS
+        raise TapCaskAmbiguityError.new(ref, loaders)
-          Cask #{ref} exists in multiple taps:
-          #{loaders.map { |loader| "  #{loader.tap}/#{loader.token}" }.join("\n")}
-        EOS
-      end
-
-      if Homebrew::EnvConfig.install_from_api? && Homebrew::API::CaskSource.available?(ref)
-        return FromContentLoader.new(Homebrew::API::CaskSource.fetch(ref))
       end
 
       possible_installed_cask = Cask.new(ref)

Library/Homebrew/cask/caskroom.rb

@@ -47,14 +47,10 @@ module Cask
         token = path.basename.to_s
 
         begin
-          if (tap_path = CaskLoader.tap_paths(token).first)
+          CaskLoader.load(token, config: config)
-            CaskLoader::FromTapPathLoader.new(tap_path).load(config: config)
+        rescue TapCaskAmbiguityError
-          elsif (caskroom_path = Pathname.glob(path.join(".metadata/*/*/*/*.rb")).first) &&
+          tap_path = CaskLoader.tap_paths(token).first
-                (!Homebrew::EnvConfig.install_from_api? || !Homebrew::API::CaskSource.available?(token))
+          CaskLoader::FromTapPathLoader.new(tap_path).load(config: config)
-            CaskLoader::FromPathLoader.new(caskroom_path).load(config: config)
-          else
-            CaskLoader.load(token, config: config)
-          end
         rescue CaskUnavailableError
           # Don't blow up because of a single unavailable cask.
           nil

Library/Homebrew/cask/config.rb

@@ -190,7 +190,7 @@ module Cask
           key = "language"
           value = T.cast(explicit.fetch(:languages, []), T::Array[String]).join(",")
         end
-        "#{key}: \"#{value.to_s.sub(/^#{ENV['HOME']}/, "~")}\""
+        "#{key}: \"#{value.to_s.sub(/^#{Dir.home}/, "~")}\""
       end.join(", ")
     end
 

Library/Homebrew/cask/dsl.rb

@@ -25,6 +25,8 @@ require "cask/dsl/version"
 require "cask/url"
 require "cask/utils"
 
+require "extend/on_system"
+
 module Cask
   # Class representing the domain-specific language used for casks.
   #
@@ -89,8 +91,13 @@ module Cask
       *ARTIFACT_BLOCK_CLASSES.flat_map { |klass| [klass.dsl_key, klass.uninstall_dsl_key] },
     ]).freeze
 
+    extend Predicable
+    include OnSystem
+
     attr_reader :cask, :token
 
+    attr_predicate :on_system_blocks_exist?
+
     def initialize(cask)
       @cask = cask
       @token = cask.token
@@ -112,10 +119,17 @@ module Cask
     def set_unique_stanza(stanza, should_return)
       return instance_variable_get("@#{stanza}") if should_return
 
-      if instance_variable_defined?("@#{stanza}")
+      unless @cask.allow_reassignment
-        raise CaskInvalidError.new(cask, "'#{stanza}' stanza may only appear once.")
+        if instance_variable_defined?("@#{stanza}") && !@called_in_on_system_block
+          raise CaskInvalidError.new(cask, "'#{stanza}' stanza may only appear once.")
+        end
+
+        if instance_variable_defined?("@#{stanza}_set_in_block") && @called_in_on_system_block
+          raise CaskInvalidError.new(cask, "'#{stanza}' stanza may only be overridden once.")
+        end
       end
 
+      instance_variable_set("@#{stanza}_set_in_block", true) if @called_in_on_system_block
       instance_variable_set("@#{stanza}", yield)
     rescue CaskInvalidError
       raise
@@ -137,7 +151,7 @@ module Cask
 
         return unless default
 
-        unless @language_blocks.default.nil?
+        if !@cask.allow_reassignment && @language_blocks.default.present?
           raise CaskInvalidError.new(cask, "Only one default language may be defined.")
         end
 
@@ -281,7 +295,7 @@ module Cask
     end
 
     def discontinued?
-      @caveats&.discontinued?
+      @caveats&.discontinued? == true
     end
 
     # @api public
@@ -294,7 +308,9 @@ module Cask
       @livecheck ||= Livecheck.new(self)
       return @livecheck unless block
 
-      raise CaskInvalidError.new(cask, "'livecheck' stanza may only appear once.") if @livecheckable
+      if !@cask.allow_reassignment && @livecheckable
+        raise CaskInvalidError.new(cask, "'livecheck' stanza may only appear once.")
+      end
 
       @livecheckable = true
       @livecheck.instance_eval(&block)

Library/Homebrew/cask/dsl/depends_on.rb

@@ -55,7 +55,7 @@ module Cask
         begin
           @macos = if args.count > 1
             MacOSRequirement.new([args], comparator: "==")
-          elsif MacOS::Version::SYMBOLS.key?(args.first)
+          elsif MacOSVersions::SYMBOLS.key?(args.first)
             MacOSRequirement.new([args.first], comparator: "==")
           elsif /^\s*(?<comparator><|>|[=<>]=)\s*:(?<version>\S+)\s*$/ =~ args.first
             MacOSRequirement.new([version.to_sym], comparator: comparator)

Library/Homebrew/cask/exceptions.rb

@@ -124,6 +124,20 @@ module Cask
     end
   end
 
+  # Error when a cask with the same name is found in multiple taps.
+  #
+  # @api private
+  class TapCaskAmbiguityError < CaskError
+    extend T::Sig
+
+    def initialize(ref, loaders)
+      super <<~EOS
+        Cask #{ref} exists in multiple taps:
+        #{loaders.map { |loader| "  #{loader.tap}/#{loader.token}" }.join("\n")}
+      EOS
+    end
+  end
+
   # Error when a cask already exists.
   #
   # @api private

Library/Homebrew/cask/url.rb

@@ -225,7 +225,7 @@ class URL < Delegator
     @raw_interpolated_url =
       Pathname(@caller_location.absolute_path)
       .each_line.drop(@caller_location.lineno - 1)
-      .first&.yield_self { |line| line[/url\s+"([^"]+)"/, 1] }
+      .first&.then { |line| line[/url\s+"([^"]+)"/, 1] }
   end
   private :raw_interpolated_url
 

Library/Homebrew/caveats.rb

@@ -78,7 +78,7 @@ class Caveats
 
       s << "  #{Utils::Shell.export_value("CPPFLAGS", "-I#{f.opt_include}")}\n" if f.include.directory?
 
-      if which("pkg-config", ENV["HOMEBREW_PATH"]) &&
+      if which("pkg-config", ORIGINAL_PATHS) &&
          ((f.lib/"pkgconfig").directory? || (f.share/"pkgconfig").directory?)
         s << <<~EOS
 
@@ -109,7 +109,7 @@ class Caveats
 
   def function_completion_caveats(shell)
     return unless keg
-    return unless which(shell.to_s, ENV["HOMEBREW_PATH"])
+    return unless which(shell.to_s, ORIGINAL_PATHS)
 
     completion_installed = keg.completion_installed?(shell)
     functions_installed = keg.functions_installed?(shell)

Library/Homebrew/cleanup.rb

@@ -391,7 +391,7 @@ module Homebrew
     end
 
     def cleanup_portable_ruby
-      rubies = [which("ruby"), which("ruby", ENV["HOMEBREW_PATH"])].compact
+      rubies = [which("ruby"), which("ruby", ORIGINAL_PATHS)].compact
       system_ruby = Pathname.new("/usr/bin/ruby")
       rubies << system_ruby if system_ruby.exist?
 

Library/Homebrew/cmd/--cache.rb

@@ -24,7 +24,7 @@ module Homebrew
              description: "Show the cache file used when building from source."
       switch "--force-bottle",
              description: "Show the cache file used when pouring a bottle."
-      flag "--bottle-tag",
+      flag "--bottle-tag=",
            description: "Show the cache file used when pouring a bottle for the given tag."
       switch "--HEAD",
              description: "Show the cache file used when building from HEAD."

Library/Homebrew/cmd/cleanup.rb

@@ -20,13 +20,13 @@ module Homebrew
         #{days} days old. This can be adjusted with `HOMEBREW_CLEANUP_MAX_AGE_DAYS`.
       EOS
       flag   "--prune=",
-             description: "Remove all cache files older than specified <days>. "\
+             description: "Remove all cache files older than specified <days>. " \
                           "If you want to remove everything, use `--prune=all`."
       switch "-n", "--dry-run",
              description: "Show what would be removed, but do not actually remove anything."
       switch "-s",
-             description: "Scrub the cache, including downloads for even the latest versions. "\
+             description: "Scrub the cache, including downloads for even the latest versions. " \
-                          "Note that downloads for any installed formulae or casks will still not be deleted. "\
+                          "Note that downloads for any installed formulae or casks will still not be deleted. " \
                           "If you want to delete those too: `rm -rf \"$(brew --cache)\"`"
       switch "--prune-prefix",
              description: "Only prune the symlinks and directories from the prefix and remove no other files."
@@ -38,7 +38,7 @@ module Homebrew
   def cleanup
     args = cleanup_args.parse
 
-    days = args.prune.presence&.yield_self do |prune|
+    days = args.prune.presence&.then do |prune|
       case prune
       when /\A\d+\Z/
         prune.to_i

Library/Homebrew/cmd/deps.rb

@@ -41,7 +41,7 @@ module Homebrew
       switch "--include-requirements",
              description: "Include requirements in addition to dependencies for <formula>."
       switch "--tree",
-             description: "Show dependencies as a tree. When given multiple formula arguments, "\
+             description: "Show dependencies as a tree. When given multiple formula arguments, " \
                           "show individual trees for each formula."
       switch "--graph",
              description: "Show dependencies as a directed graph."
@@ -49,16 +49,16 @@ module Homebrew
              depends_on:  "--graph",
              description: "Show text-based graph description in DOT format."
       switch "--annotate",
-             description: "Mark any build, test, optional, or recommended dependencies as "\
+             description: "Mark any build, test, optional, or recommended dependencies as " \
                           "such in the output."
       switch "--installed",
-             description: "List dependencies for formulae that are currently installed. If <formula> is "\
+             description: "List dependencies for formulae that are currently installed. If <formula> is " \
                           "specified, list only its dependencies that are currently installed."
       switch "--all",
              description: "List dependencies for all available formulae."
       switch "--for-each",
-             description: "Switch into the mode used by the `--all` option, but only list dependencies "\
+             description: "Switch into the mode used by the `--all` option, but only list dependencies " \
-                          "for each provided <formula>, one formula per line. This is used for "\
+                          "for each provided <formula>, one formula per line. This is used for " \
                           "debugging the `--installed`/`--all` display mode."
       switch "--formula", "--formulae",
              depends_on:  "--installed",

Library/Homebrew/cmd/desc.rb

@@ -22,13 +22,13 @@ module Homebrew
         first search, making that search slower than subsequent ones.
       EOS
       switch "-s", "--search",
-             description: "Search both names and descriptions for <text>. If <text> is flanked by "\
+             description: "Search both names and descriptions for <text>. If <text> is flanked by " \
                           "slashes, it is interpreted as a regular expression."
       switch "-n", "--name",
-             description: "Search just names for <text>. If <text> is flanked by slashes, it is "\
+             description: "Search just names for <text>. If <text> is flanked by slashes, it is " \
                           "interpreted as a regular expression."
       switch "-d", "--description",
-             description: "Search just descriptions for <text>. If <text> is flanked by slashes, "\
+             description: "Search just descriptions for <text>. If <text> is flanked by slashes, " \
                           "it is interpreted as a regular expression."
       switch "--formula", "--formulae",
              description: "Treat all named arguments as formulae."

Library/Homebrew/cmd/doctor.rb

@@ -21,7 +21,7 @@ module Homebrew
         an issue; just ignore this.
       EOS
       switch "--list-checks",
-             description: "List all audit methods, which can be run individually "\
+             description: "List all audit methods, which can be run individually " \
                           "if provided as arguments."
       switch "-D", "--audit-debug",
              description: "Enable debugging and profiling of audit methods."

Library/Homebrew/cmd/fetch.rb

@@ -20,17 +20,17 @@ module Homebrew
         Download a bottle (if available) or source packages for <formula>e
         and binaries for <cask>s. For files, also print SHA-256 checksums.
       EOS
-      flag "--bottle-tag",
+      flag "--bottle-tag=",
            description: "Download a bottle for given tag."
       switch "--HEAD",
              description: "Fetch HEAD version instead of stable version."
       switch "-f", "--force",
              description: "Remove a previously cached version and re-fetch."
       switch "-v", "--verbose",
-             description: "Do a verbose VCS checkout, if the URL represents a VCS. This is useful for "\
+             description: "Do a verbose VCS checkout, if the URL represents a VCS. This is useful for " \
                           "seeing if an existing VCS cache has been updated."
       switch "--retry",
-             description: "Retry if downloading fails or re-download if the checksum of a previously cached "\
+             description: "Retry if downloading fails or re-download if the checksum of a previously cached " \
                           "version no longer matches."
       switch "--deps",
              description: "Also download dependencies for any listed <formula>."
@@ -39,7 +39,7 @@ module Homebrew
       switch "--build-bottle",
              description: "Download source packages (for eventual bottling) rather than a bottle."
       switch "--force-bottle",
-             description: "Download a bottle if it exists for the current or newest version of macOS, "\
+             description: "Download a bottle if it exists for the current or newest version of macOS, " \
                           "even if it would not be used during installation."
       switch "--[no-]quarantine",
              description: "Disable/enable quarantining of downloads (default: enabled).",

Library/Homebrew/cmd/gist-logs.rb

@@ -25,10 +25,10 @@ module Homebrew
       switch "--with-hostname",
              description: "Include the hostname in the Gist."
       switch "-n", "--new-issue",
-             description: "Automatically create a new issue in the appropriate GitHub repository "\
+             description: "Automatically create a new issue in the appropriate GitHub repository " \
                           "after creating the Gist."
       switch "-p", "--private",
-             description: "The Gist will be marked private and will not appear in listings but will "\
+             description: "The Gist will be marked private and will not appear in listings but will " \
                           "be accessible with its link."
 
       named_args :formula, number: 1

Library/Homebrew/cmd/info.rb

@@ -31,25 +31,25 @@ module Homebrew
         If a <formula> or <cask> is provided, show summary of information about it.
       EOS
       switch "--analytics",
-             description: "List global Homebrew analytics data or, if specified, installation and "\
+             description: "List global Homebrew analytics data or, if specified, installation and " \
-                          "build error data for <formula> (provided neither `HOMEBREW_NO_ANALYTICS` "\
+                          "build error data for <formula> (provided neither `HOMEBREW_NO_ANALYTICS` " \
                           "nor `HOMEBREW_NO_GITHUB_API` are set)."
       flag   "--days=",
              depends_on:  "--analytics",
-             description: "How many days of analytics data to retrieve. "\
+             description: "How many days of analytics data to retrieve. " \
                           "The value for <days> must be `30`, `90` or `365`. The default is `30`."
       flag   "--category=",
              depends_on:  "--analytics",
-             description: "Which type of analytics data to retrieve. "\
+             description: "Which type of analytics data to retrieve. " \
-                          "The value for <category> must be `install`, `install-on-request` or `build-error`; "\
+                          "The value for <category> must be `install`, `install-on-request` or `build-error`; " \
-                          "`cask-install` or `os-version` may be specified if <formula> is not. "\
+                          "`cask-install` or `os-version` may be specified if <formula> is not. " \
                           "The default is `install`."
       switch "--github",
-             description: "Open the GitHub source page for <formula> and <cask> in a browser. "\
+             description: "Open the GitHub source page for <formula> and <cask> in a browser. " \
                           "To view the history locally: `brew log -p` <formula> or <cask>"
       flag   "--json",
-             description: "Print a JSON representation. Currently the default value for <version> is `v1` for "\
+             description: "Print a JSON representation. Currently the default value for <version> is `v1` for " \
-                          "<formula>. For <formula> and <cask> use `v2`. See the docs for examples of using the "\
+                          "<formula>. For <formula> and <cask> use `v2`. See the docs for examples of using the " \
                           "JSON output: <https://docs.brew.sh/Querying-Brew>"
       switch "--bottle",
              depends_on:  "--json",

Library/Homebrew/cmd/install.rb

@@ -41,7 +41,7 @@ module Homebrew
                           "or a shell inside the temporary build directory."
       switch "-f", "--force",
              description: "Install formulae without checking for previously installed keg-only or " \
-                          "non-migrated versions. When installing casks, overwrite existing files "\
+                          "non-migrated versions. When installing casks, overwrite existing files " \
                           "(binaries and symlinks are excluded, unless originally from the same cask)."
       switch "-v", "--verbose",
              description: "Print the verification and postinstall steps."
@@ -140,6 +140,10 @@ module Homebrew
   def install
     args = install_args.parse
 
+    if args.build_from_source? && Homebrew::EnvConfig.install_from_api?
+      raise UsageError, "--build-from-source is not supported when using HOMEBREW_INSTALL_FROM_API."
+    end
+
     if args.env.present?
       # Can't use `replacement: false` because `install_args` are used by
       # `build.rb`. Instead, `hide_from_man_page` and don't do anything with

Library/Homebrew/cmd/link.rb

@@ -22,7 +22,7 @@ module Homebrew
       switch "--overwrite",
              description: "Delete files that already exist in the prefix while linking."
       switch "-n", "--dry-run",
-             description: "List files which would be linked or deleted by "\
+             description: "List files which would be linked or deleted by " \
                           "`brew link --overwrite` without actually linking or deleting any files."
       switch "-f", "--force",
              description: "Allow keg-only formulae to be linked."

Library/Homebrew/cmd/list.rb

@@ -25,17 +25,17 @@ module Homebrew
       switch "--cask", "--casks",
              description: "List only casks, or treat all named arguments as casks."
       switch "--full-name",
-             description: "Print formulae with fully-qualified names. Unless `--full-name`, `--versions` "\
+             description: "Print formulae with fully-qualified names. Unless `--full-name`, `--versions` " \
-                          "or `--pinned` are passed, other options (i.e. `-1`, `-l`, `-r` and `-t`) are "\
+                          "or `--pinned` are passed, other options (i.e. `-1`, `-l`, `-r` and `-t`) are " \
                           "passed to `ls`(1) which produces the actual output."
       switch "--versions",
-             description: "Show the version number for installed formulae, or only the specified "\
+             description: "Show the version number for installed formulae, or only the specified " \
                           "formulae if <formula> are provided."
       switch "--multiple",
              depends_on:  "--versions",
              description: "Only show formulae with multiple versions installed."
       switch "--pinned",
-             description: "List only pinned formulae, or only the specified (pinned) "\
+             description: "List only pinned formulae, or only the specified (pinned) " \
                           "formulae if <formula> are provided. See also `pin`, `unpin`."
       # passed through to ls
       switch "-1",

Library/Homebrew/cmd/log.rb

@@ -42,7 +42,7 @@ module Homebrew
 
     # As this command is simplifying user-run commands then let's just use a
     # user path, too.
-    ENV["PATH"] = ENV["HOMEBREW_PATH"]
+    ENV["PATH"] = PATH.new(ORIGINAL_PATHS).to_s
 
     if args.no_named?
       git_log HOMEBREW_REPOSITORY, args: args

Library/Homebrew/cmd/migrate.rb

@@ -17,7 +17,7 @@ module Homebrew
         packages.
       EOS
       switch "-f", "--force",
-             description: "Treat installed <formula> and provided <formula> as if they are from "\
+             description: "Treat installed <formula> and provided <formula> as if they are from " \
                           "the same taps and migrate them anyway."
       switch "-n", "--dry-run",
              description: "Show what would be migrated, but do not actually migrate anything."

Library/Homebrew/cmd/missing.rb

@@ -20,7 +20,7 @@ module Homebrew
         to be missing dependencies.
       EOS
       comma_array "--hide",
-                  description: "Act as if none of the specified <hidden> are installed. <hidden> should be "\
+                  description: "Act as if none of the specified <hidden> are installed. <hidden> should be " \
                                "a comma-separated list of formulae."
 
       named_args :formula

Library/Homebrew/cmd/outdated.rb

@@ -33,17 +33,17 @@ module Homebrew
                           "`v1` is deprecated and is currently the default if no version is specified. " \
                           "`v2` prints outdated formulae and casks."
       switch "--fetch-HEAD",
-             description: "Fetch the upstream repository to detect if the HEAD installation of the "\
+             description: "Fetch the upstream repository to detect if the HEAD installation of the " \
-                          "formula is outdated. Otherwise, the repository's HEAD will only be checked for "\
+                          "formula is outdated. Otherwise, the repository's HEAD will only be checked for " \
                           "updates when a new stable or development version has been released."
       switch "--greedy",
-             description: "Print outdated casks with `auto_updates true` or `version :latest`."
+             description: "Also include outdated casks with `auto_updates true` or `version :latest`."
 
       switch "--greedy-latest",
-             description: "Print outdated casks including those with `version :latest`."
+             description: "Also include outdated casks including those with `version :latest`."
 
       switch "--greedy-auto-updates",
-             description: "Print outdated casks including those with `auto_updates true`."
+             description: "Also include outdated casks including those with `auto_updates true`."
 
       conflicts "--quiet", "--verbose", "--json"
       conflicts "--formula", "--cask"

Library/Homebrew/cmd/reinstall.rb

@@ -88,6 +88,10 @@ module Homebrew
   def reinstall
     args = reinstall_args.parse
 
+    if args.build_from_source? && Homebrew::EnvConfig.install_from_api?
+      raise UsageError, "--build-from-source is not supported when using HOMEBREW_INSTALL_FROM_API."
+    end
+
     formulae, casks = args.named.to_formulae_and_casks(method: :resolve)
                           .partition { |o| o.is_a?(Formula) }
 

Library/Homebrew/cmd/search.rb

@@ -42,7 +42,7 @@ module Homebrew
       switch "--cask", "--casks",
              description: "Search online and locally for casks."
       switch "--desc",
-             description: "Search for formulae with a description matching <text> and casks with "\
+             description: "Search for formulae with a description matching <text> and casks with " \
                           "a name or description matching <text>."
       switch "--pull-request",
              description: "Search for GitHub pull requests containing <text>."

Library/Homebrew/cmd/tap-info.rb

@@ -19,8 +19,8 @@ module Homebrew
       switch "--installed",
              description: "Show information on each installed tap."
       flag   "--json",
-             description: "Print a JSON representation of <tap>. Currently the default and only accepted "\
+             description: "Print a JSON representation of <tap>. Currently the default and only accepted " \
-                          "value for <version> is `v1`. See the docs for examples of using the JSON "\
+                          "value for <version> is `v1`. See the docs for examples of using the JSON " \
                           "output: <https://docs.brew.sh/Querying-Brew>"
 
       named_args :tap

Library/Homebrew/cmd/tap.rb

@@ -28,14 +28,14 @@ module Homebrew
         using protocols other than HTTPS, e.g. SSH, git, HTTP, FTP(S), rsync.
       EOS
       switch "--full",
-             description: "Convert a shallow clone to a full clone without untapping. Taps are only cloned as "\
+             description: "Convert a shallow clone to a full clone without untapping. Taps are only cloned as " \
                           "shallow clones if `--shallow` was originally passed.",
              replacement: false
       switch "--shallow",
              description: "Fetch tap as a shallow clone rather than a full clone. Useful for continuous integration.",
              replacement: false
       switch "--[no-]force-auto-update",
-             description: "Auto-update tap even if it is not hosted on GitHub. By default, only taps "\
+             description: "Auto-update tap even if it is not hosted on GitHub. By default, only taps " \
                           "hosted on GitHub are auto-updated (for performance reasons)."
       switch "--custom-remote",
              description: "Install or change a tap with a custom remote. Useful for mirrors."

Library/Homebrew/cmd/uninstall.rb

@@ -28,7 +28,7 @@ module Homebrew
              description: "Remove all files associated with a <cask>. " \
                           "*May remove files which are shared between applications.*"
       switch "--ignore-dependencies",
-             description: "Don't fail uninstall, even if <formula> is a dependency of any installed "\
+             description: "Don't fail uninstall, even if <formula> is a dependency of any installed " \
                           "formulae."
       switch "--formula", "--formulae",
              description: "Treat all named arguments as formulae."

Library/Homebrew/cmd/unlink.rb

@@ -19,7 +19,7 @@ module Homebrew
         `brew unlink` <formula> `&&` <commands> `&& brew link` <formula>
       EOS
       switch "-n", "--dry-run",
-             description: "List files which would be unlinked without actually unlinking or "\
+             description: "List files which would be unlinked without actually unlinking or " \
                           "deleting any files."
 
       named_args :installed_formula, min: 1

Library/Homebrew/cmd/update-report.rb

@@ -31,7 +31,7 @@ module Homebrew
       switch "--auto-update", "--preinstall",
              description: "Run in 'auto-update' mode (faster, less output)."
       switch "-f", "--force",
-             description: "Treat installed and updated formulae as if they are from "\
+             description: "Treat installed and updated formulae as if they are from " \
                           "the same taps and migrate them anyway."
 
       hide_from_man_page!
@@ -54,9 +54,9 @@ module Homebrew
        ENV["HOMEBREW_LINUXBREW_CORE_MIGRATION"].blank?
       ohai "Re-running `brew update` for linuxbrew-core migration"
 
-      if ENV["HOMEBREW_CORE_DEFAULT_GIT_REMOTE"] != ENV["HOMEBREW_CORE_GIT_REMOTE"]
+      if HOMEBREW_CORE_DEFAULT_GIT_REMOTE != Homebrew::EnvConfig.core_git_remote
         opoo <<~EOS
-          HOMEBREW_CORE_GIT_REMOTE was set: #{ENV["HOMEBREW_CORE_GIT_REMOTE"]}.
+          HOMEBREW_CORE_GIT_REMOTE was set: #{Homebrew::EnvConfig.core_git_remote}.
           It has been unset for the migration.
           You may need to change this from a linuxbrew-core mirror to a homebrew-core one.
 
@@ -64,9 +64,9 @@ module Homebrew
       end
       ENV.delete("HOMEBREW_CORE_GIT_REMOTE")
 
-      if ENV["HOMEBREW_BOTTLE_DEFAULT_DOMAIN"] != ENV["HOMEBREW_BOTTLE_DOMAIN"]
+      if HOMEBREW_BOTTLE_DEFAULT_DOMAIN != Homebrew::EnvConfig.bottle_domain
         opoo <<~EOS
-          HOMEBREW_BOTTLE_DOMAIN was set: #{ENV["HOMEBREW_BOTTLE_DOMAIN"]}.
+          HOMEBREW_BOTTLE_DOMAIN was set: #{Homebrew::EnvConfig.bottle_domain}.
           It has been unset for the migration.
           You may need to change this from a Linuxbrew package mirror to a Homebrew one.
 
@@ -142,14 +142,14 @@ module Homebrew
     end
 
     Homebrew.failed = true if ENV["HOMEBREW_UPDATE_FAILED"]
-    return if ENV["HOMEBREW_DISABLE_LOAD_FORMULA"]
+    return if Homebrew::EnvConfig.disable_load_formula?
 
     hub = ReporterHub.new
 
     updated_taps = []
     Tap.each do |tap|
       next unless tap.git?
-      next if (tap.core_tap? || tap == "homebrew/cask") && Homebrew::EnvConfig.install_from_api? && args.auto_update?
+      next if (tap.core_tap? || tap == "homebrew/cask") && Homebrew::EnvConfig.install_from_api?
 
       if ENV["HOMEBREW_MIGRATE_LINUXBREW_FORMULAE"].present? && tap.core_tap? &&
          Settings.read("linuxbrewmigrated") != "true"
@@ -239,14 +239,13 @@ module Homebrew
 
     puts
     ohai "Homebrew was updated to version #{new_repository_version}"
+    Settings.write "latesttag", new_repository_version
     if new_repository_version.split(".").last == "0"
-      Settings.write "latesttag", new_repository_version
       puts <<~EOS
         More detailed release notes are available on the Homebrew Blog:
           #{Formatter.url("https://brew.sh/blog/#{new_repository_version}")}
       EOS
     elsif !args.quiet?
-      Settings.write "latesttag", new_repository_version
       puts <<~EOS
         The changelog can be found at:
           #{Formatter.url("https://github.com/Homebrew/brew/releases/tag/#{new_repository_version}")}
@@ -608,9 +607,7 @@ class ReporterHub
   private
 
   def dump_new_formula_report
-    formulae = select_formula_or_cask(:A).sort.map do |name|
+    formulae = select_formula_or_cask(:A).sort.reject { |name| installed?(name) }
-      name unless installed?(name)
-    end.compact
 
     output_dump_formula_or_cask_report "New Formulae", formulae
   end

Library/Homebrew/cmd/update.sh

@@ -701,10 +701,7 @@ EOS
 
   for DIR in "${HOMEBREW_REPOSITORY}" "${HOMEBREW_LIBRARY}"/Taps/*/*
   do
-    # HOMEBREW_UPDATE_AUTO wasn't modified in subshell.
-    # shellcheck disable=SC2031
     if [[ -n "${HOMEBREW_INSTALL_FROM_API}" ]] &&
-       [[ -n "${HOMEBREW_UPDATE_AUTO}" ]] &&
        [[ "${DIR}" == "${HOMEBREW_CORE_REPOSITORY}" ||
           "${DIR}" == "${HOMEBREW_LIBRARY}/Taps/homebrew/homebrew-cask" ]]
     then

Library/Homebrew/cmd/upgrade.rb

@@ -30,11 +30,11 @@ module Homebrew
         upgraded formulae or, every 30 days, for all formulae.
       EOS
       switch "-d", "--debug",
-             description: "If brewing fails, open an interactive debugging session with access to IRB "\
+             description: "If brewing fails, open an interactive debugging session with access to IRB " \
                           "or a shell inside the temporary build directory."
       switch "-f", "--force",
-             description: "Install formulae without checking for previously installed keg-only or "\
+             description: "Install formulae without checking for previously installed keg-only or " \
-                          "non-migrated versions. When installing casks, overwrite existing files "\
+                          "non-migrated versions. When installing casks, overwrite existing files " \
                           "(binaries and symlinks are excluded, unless originally from the same cask)."
       switch "-v", "--verbose",
              description: "Print the verification and postinstall steps."
@@ -49,17 +49,17 @@ module Homebrew
           description: "Compile <formula> from source even if a bottle is available.",
         }],
         [:switch, "-i", "--interactive", {
-          description: "Download and patch <formula>, then open a shell. This allows the user to "\
+          description: "Download and patch <formula>, then open a shell. This allows the user to " \
-                       "run `./configure --help` and otherwise determine how to turn the software "\
+                       "run `./configure --help` and otherwise determine how to turn the software " \
                        "package into a Homebrew package.",
         }],
         [:switch, "--force-bottle", {
-          description: "Install from a bottle if it exists for the current or newest version of "\
+          description: "Install from a bottle if it exists for the current or newest version of " \
                        "macOS, even if it would not normally be used for installation.",
         }],
         [:switch, "--fetch-HEAD", {
-          description: "Fetch the upstream repository to detect if the HEAD installation of the "\
+          description: "Fetch the upstream repository to detect if the HEAD installation of the " \
-                       "formula is outdated. Otherwise, the repository's HEAD will only be checked for "\
+                       "formula is outdated. Otherwise, the repository's HEAD will only be checked for " \
                        "updates when a new stable or development version has been released.",
         }],
         [:switch, "--ignore-pinned", {

Library/Homebrew/commands.rb

@@ -31,6 +31,25 @@ module Commands
     "tc"          => "typecheck",
   }.freeze
 
+  INSTALL_FROM_API_FORBIDDEN_COMMANDS = %w[
+    audit
+    bottle
+    bump-cask-pr
+    bump-formula-pr
+    bump-revision
+    bump-unversioned-casks
+    cat
+    create
+    edit
+    extract
+    formula
+    livecheck
+    pr-pull
+    pr-upload
+    test
+    update-python-resources
+  ].freeze
+
   def valid_internal_cmd?(cmd)
     require?(HOMEBREW_CMD_PATH/cmd)
   end
@@ -74,11 +93,11 @@ module Commands
 
   # Ruby commands which are run by being `require`d.
   def external_ruby_cmd_path(cmd)
-    which("brew-#{cmd}.rb", PATH.new(ENV["PATH"]).append(Tap.cmd_directories))
+    which("brew-#{cmd}.rb", PATH.new(ENV.fetch("PATH")).append(Tap.cmd_directories))
   end
 
   def external_cmd_path(cmd)
-    which("brew-#{cmd}", PATH.new(ENV["PATH"]).append(Tap.cmd_directories))
+    which("brew-#{cmd}", PATH.new(ENV.fetch("PATH")).append(Tap.cmd_directories))
   end
 
   def path(cmd)

Library/Homebrew/dependency.rb

@@ -37,7 +37,7 @@ class Dependency
   alias eql? ==
 
   def hash
-    name.hash ^ tags.hash
+    [name, tags].hash
   end
 
   def to_formula

Library/Homebrew/deprecate_disable.rb

@@ -16,7 +16,7 @@ module DeprecateDisable
     unsupported:         "is not supported upstream",
     deprecated_upstream: "is deprecated upstream",
     versioned_formula:   "is a versioned formula",
-    checksum_mismatch:   "was built with an initially released source file that had "\
+    checksum_mismatch:   "was built with an initially released source file that had " \
                          "a different checksum than the current one. " \
                          "Upstream's repository might have been compromised. " \
                          "We can re-package this once upstream has confirmed that they retagged their release",

Library/Homebrew/dev-cmd/audit.rb

@@ -45,8 +45,8 @@ module Homebrew
              description: "Check all formulae and casks whether installed or not.",
              hidden:      true
       switch "--new", "--new-formula", "--new-cask",
-             description: "Run various additional style checks to determine if a new formula or cask is eligible "\
+             description: "Run various additional style checks to determine if a new formula or cask is eligible " \
-                          "for Homebrew. This should be used when creating new formula and implies "\
+                          "for Homebrew. This should be used when creating new formula and implies " \
                           "`--strict` and `--online`."
       switch "--[no-]appcast",
              description: "Audit the appcast."
@@ -59,27 +59,27 @@ module Homebrew
       switch "--display-cop-names",
              description: "Include the RuboCop cop name for each violation in the output."
       switch "--display-filename",
-             description: "Prefix every line of output with the file or formula name being audited, to "\
+             description: "Prefix every line of output with the file or formula name being audited, to " \
                           "make output easy to grep."
       switch "--display-failures-only",
              description: "Only display casks that fail the audit. This is the default for formulae."
       switch "--skip-style",
-             description: "Skip running non-RuboCop style checks. Useful if you plan on running "\
+             description: "Skip running non-RuboCop style checks. Useful if you plan on running " \
                           "`brew style` separately. Enabled by default unless a formula is specified by name."
       switch "-D", "--audit-debug",
              description: "Enable debugging and profiling of audit methods."
       comma_array "--only",
-                  description: "Specify a comma-separated <method> list to only run the methods named "\
+                  description: "Specify a comma-separated <method> list to only run the methods named " \
                                "`audit_`<method>."
       comma_array "--except",
-                  description: "Specify a comma-separated <method> list to skip running the methods named "\
+                  description: "Specify a comma-separated <method> list to skip running the methods named " \
                                "`audit_`<method>."
       comma_array "--only-cops",
-                  description: "Specify a comma-separated <cops> list to check for violations of only the listed "\
+                  description: "Specify a comma-separated <cops> list to check for violations of only the listed " \
                                "RuboCop cops."
       comma_array "--except-cops",
-                  description: "Specify a comma-separated <cops> list to skip checking for violations of the listed "\
+                  description: "Specify a comma-separated <cops> list to skip checking for violations of the " \
-                               "RuboCop cops."
+                               "listed RuboCop cops."
       switch "--formula", "--formulae",
              description: "Treat all named arguments as formulae."
       switch "--cask", "--casks",
@@ -121,7 +121,7 @@ module Homebrew
     # TODO: 3.6.0: odeprecate not specifying args.all?, require args.installed?
 
     audit_formulae, audit_casks = if args.tap
-      Tap.fetch(args.tap).yield_self do |tap|
+      Tap.fetch(args.tap).then do |tap|
         [
           tap.formula_names.map { |name| Formula[name] },
           tap.cask_files.map { |path| Cask::CaskLoader.load(path) },

Library/Homebrew/dev-cmd/bottle.rb

@@ -58,22 +58,22 @@ module Homebrew
       switch "--no-rebuild",
              description: "If the formula specifies a rebuild version, remove it from the generated DSL."
       switch "--keep-old",
-             description: "If the formula specifies a rebuild version, attempt to preserve its value in the "\
+             description: "If the formula specifies a rebuild version, attempt to preserve its value in the " \
                           "generated DSL."
       switch "--json",
-             description: "Write bottle information to a JSON file, which can be used as the value for "\
+             description: "Write bottle information to a JSON file, which can be used as the value for " \
                           "`--merge`."
       switch "--merge",
-             description: "Generate an updated bottle block for a formula and optionally merge it into the "\
+             description: "Generate an updated bottle block for a formula and optionally merge it into the " \
-                          "formula file. Instead of a formula name, requires the path to a JSON file generated with "\
+                          "formula file. Instead of a formula name, requires the path to a JSON file generated " \
-                          "`brew bottle --json` <formula>."
+                          "with `brew bottle --json` <formula>."
       switch "--write",
              depends_on:  "--merge",
-             description: "Write changes to the formula file. A new commit will be generated unless "\
+             description: "Write changes to the formula file. A new commit will be generated unless " \
                           "`--no-commit` is passed."
       switch "--no-commit",
              depends_on:  "--write",
-             description: "When passed with `--write`, a new commit will not generated after writing changes "\
+             description: "When passed with `--write`, a new commit will not generated after writing changes " \
                           "to the formula file."
       switch "--only-json-tab",
              depends_on:  "--json",
@@ -83,7 +83,7 @@ module Homebrew
       flag   "--root-url=",
              description: "Use the specified <URL> as the root of the bottle's URL instead of Homebrew's default."
       flag   "--root-url-using=",
-             description: "Use the specified download strategy class for downloading the bottle's URL instead of "\
+             description: "Use the specified download strategy class for downloading the bottle's URL instead of " \
                           "Homebrew's default."
 
       conflicts "--no-rebuild", "--keep-old"

Library/Homebrew/dev-cmd/bump-cask-pr.rb

@@ -26,7 +26,7 @@ module Homebrew
              description: "Make the expected file modifications without taking any Git actions."
       switch "--commit",
              depends_on:  "--write-only",
-             description: "When passed with `--write-only`, generate a new commit after writing changes "\
+             description: "When passed with `--write-only`, generate a new commit after writing changes " \
                           "to the cask file."
       switch "--no-audit",
              description: "Don't run `brew audit` before opening the PR."
@@ -67,7 +67,7 @@ module Homebrew
 
     # As this command is simplifying user-run commands then let's just use a
     # user path, too.
-    ENV["PATH"] = ENV["HOMEBREW_PATH"]
+    ENV["PATH"] = PATH.new(ORIGINAL_PATHS).to_s
 
     # Use the user's browser, too.
     ENV["BROWSER"] = Homebrew::EnvConfig.browser

Library/Homebrew/dev-cmd/bump-formula-pr.rb

@@ -42,7 +42,7 @@ module Homebrew
       switch "--write", hidden: true
       switch "--commit",
              depends_on:  "--write-only",
-             description: "When passed with `--write-only`, generate a new commit after writing changes "\
+             description: "When passed with `--write-only`, generate a new commit after writing changes " \
                           "to the formula file."
       switch "--no-audit",
              description: "Don't run `brew audit` before opening the PR."
@@ -55,18 +55,18 @@ module Homebrew
       switch "--no-fork",
              description: "Don't try to fork the repository."
       comma_array "--mirror",
-                  description: "Use the specified <URL> as a mirror URL. If <URL> is a comma-separated list "\
+                  description: "Use the specified <URL> as a mirror URL. If <URL> is a comma-separated list " \
                                "of URLs, multiple mirrors will be added."
       flag   "--fork-org=",
              description: "Use the specified GitHub organization for forking."
       flag   "--version=",
-             description: "Use the specified <version> to override the value parsed from the URL or tag. Note "\
+             description: "Use the specified <version> to override the value parsed from the URL or tag. Note " \
-                          "that `--version=0` can be used to delete an existing version override from a "\
+                          "that `--version=0` can be used to delete an existing version override from a " \
                           "formula if it has become redundant."
       flag   "--message=",
              description: "Append <message> to the default pull request message."
       flag   "--url=",
-             description: "Specify the <URL> for the new download. If a <URL> is specified, the <SHA-256> "\
+             description: "Specify the <URL> for the new download. If a <URL> is specified, the <SHA-256> " \
                           "checksum of the new download should also be specified."
       flag   "--sha256=",
              depends_on:  "--url=",
@@ -74,12 +74,12 @@ module Homebrew
       flag   "--tag=",
              description: "Specify the new git commit <tag> for the formula."
       flag   "--revision=",
-             description: "Specify the new commit <revision> corresponding to the specified git <tag> "\
+             description: "Specify the new commit <revision> corresponding to the specified git <tag> " \
                           "or specified <version>."
       switch "-f", "--force",
              description: "Ignore duplicate open PRs. Remove all mirrors if `--mirror` was not specified."
       flag   "--python-package-name=",
-             description: "Use the specified <package-name> when finding Python resources for <formula>. "\
+             description: "Use the specified <package-name> when finding Python resources for <formula>. " \
                           "If no package name is specified, it will be inferred from the formula's stable URL."
       comma_array "--python-extra-packages=",
                   description: "Include these additional Python packages when finding resources."
@@ -108,7 +108,7 @@ module Homebrew
 
     # As this command is simplifying user-run commands then let's just use a
     # user path, too.
-    ENV["PATH"] = ENV["HOMEBREW_PATH"]
+    ENV["PATH"] = PATH.new(ORIGINAL_PATHS).to_s
 
     # Use the user's browser, too.
     ENV["BROWSER"] = Homebrew::EnvConfig.browser
@@ -275,7 +275,7 @@ module Homebrew
 
     if new_mirrors.present?
       replacement_pairs << [
-        /^( +)(url "#{Regexp.escape(new_url)}"\n)/m,
+        /^( +)(url "#{Regexp.escape(new_url)}"[^\n]*?\n)/m,
         "\\1\\2\\1mirror \"#{new_mirrors.join("\"\n\\1mirror \"")}\"\n",
       ]
     end
@@ -293,7 +293,7 @@ module Homebrew
         ]
       elsif new_url.present?
         [
-          /^( +)(url "#{Regexp.escape(new_url)}"\n)/m,
+          /^( +)(url "#{Regexp.escape(new_url)}"[^\n]*?\n)/m,
           "\\1\\2\\1version \"#{new_version}\"\n",
         ]
       elsif new_revision.present?

Library/Homebrew/dev-cmd/bump-revision.rb

@@ -36,7 +36,7 @@ module Homebrew
 
     # As this command is simplifying user-run commands then let's just use a
     # user path, too.
-    ENV["PATH"] = ENV["HOMEBREW_PATH"]
+    ENV["PATH"] = PATH.new(ORIGINAL_PATHS).to_s
 
     args.named.to_formulae.each do |formula|
       current_revision = formula.revision

Library/Homebrew/dev-cmd/bump-unversioned-casks.rb

@@ -98,7 +98,7 @@ module Homebrew
       return
     end
 
-    last_check_time = state["check_time"]&.yield_self { |t| Time.parse(t) }
+    last_check_time = state["check_time"]&.then { |t| Time.parse(t) }
 
     check_time = Time.now
     if last_check_time && check_time < (last_check_time + 1.day)
@@ -107,7 +107,7 @@ module Homebrew
     end
 
     last_sha256 = state["sha256"]
-    last_time = state["time"]&.yield_self { |t| Time.parse(t) }
+    last_time = state["time"]&.then { |t| Time.parse(t) }
     last_file_size = state["file_size"]
 
     download = Cask::Download.new(cask)

Library/Homebrew/dev-cmd/bump.rb

@@ -61,9 +61,7 @@ module Homebrew
 
     unless Utils::Curl.curl_supports_tls13?
       begin
-        unless Pathname.new(ENV["HOMEBREW_BREWED_CURL_PATH"]).exist?
+        ensure_formula_installed!("curl", reason: "Repology queries") unless HOMEBREW_BREWED_CURL_PATH.exist?
-          ensure_formula_installed!("curl", reason: "Repology queries")
-        end
       rescue FormulaUnavailableError
         opoo "A newer `curl` is required for Repology queries."
       end

Library/Homebrew/dev-cmd/create.rb

@@ -46,8 +46,8 @@ module Homebrew
       switch "--rust",
              description: "Create a basic template for a Rust build."
       switch "--no-fetch",
-             description: "Homebrew will not download <URL> to the cache and will thus not add its SHA-256 "\
+             description: "Homebrew will not download <URL> to the cache and will thus not add its SHA-256 " \
-                          "to the formula for you, nor will it check the GitHub API for GitHub projects "\
+                          "to the formula for you, nor will it check the GitHub API for GitHub projects " \
                           "(to fill out its description and homepage)."
       switch "--HEAD",
              description: "Indicate that <URL> points to the package's repository rather than a file."

Library/Homebrew/dev-cmd/dispatch-build-bottle.rb

@@ -52,7 +52,7 @@ module Homebrew
     if (macos = args.macos&.compact_blank) && macos.present?
       runners += macos.map do |element|
         # We accept runner name syntax (11-arm64) or bottle syntax (arm64_big_sur)
-        os, arch = element.yield_self do |s|
+        os, arch = element.then do |s|
           tag = Utils::Bottles::Tag.from_symbol(s.to_sym)
           [tag.to_macos_version, tag.arch]
         rescue ArgumentError, MacOSVersionError

Library/Homebrew/dev-cmd/generate-man-completions.rb

@@ -23,9 +23,9 @@ module Homebrew
         Generate Homebrew's manpages and shell completions.
       EOS
       switch "--fail-if-not-changed",
-             description: "Return a failing status code if no changes are detected in the manpage outputs. "\
+             description: "Return a failing status code if no changes are detected in the manpage outputs. " \
-                          "This can be used to notify CI when the manpages are out of date. Additionally, "\
+                          "This can be used to notify CI when the manpages are out of date. Additionally, " \
-                          "the date used in new manpages will match those in the existing manpages (to allow "\
+                          "the date used in new manpages will match those in the existing manpages (to allow " \
                           "comparison without factoring in the date)."
       named_args :none
     end

Library/Homebrew/dev-cmd/linkage.rb

@@ -18,16 +18,16 @@ module Homebrew
         provided, check all kegs. Raises an error if run on uninstalled formulae.
       EOS
       switch "--test",
-             description: "Show only missing libraries and exit with a non-zero status if any missing "\
+             description: "Show only missing libraries and exit with a non-zero status if any missing " \
                           "libraries are found."
       switch "--strict",
              depends_on:  "--test",
              description: "Exit with a non-zero status if any undeclared dependencies with linkage are found."
       switch "--reverse",
-             description: "For every library that a keg references, print its dylib path followed by the "\
+             description: "For every library that a keg references, print its dylib path followed by the " \
                           "binaries that link to it."
       switch "--cached",
-             description: "Print the cached linkage values stored in `HOMEBREW_CACHE`, set by a previous "\
+             description: "Print the cached linkage values stored in `HOMEBREW_CACHE`, set by a previous " \
                           "`brew linkage` run."
 
       named_args :installed_formula

Library/Homebrew/dev-cmd/livecheck.rb

@@ -11,10 +11,7 @@ module Homebrew
 
   module_function
 
-  WATCHLIST_PATH = (
+  WATCHLIST_PATH = File.expand_path(Homebrew::EnvConfig.livecheck_watchlist).freeze
-    ENV["HOMEBREW_LIVECHECK_WATCHLIST"] ||
-    "#{Dir.home}/.brew_livecheck_watchlist"
-  ).freeze
 
   sig { returns(CLI::Parser) }
   def livecheck_args
@@ -58,7 +55,7 @@ module Homebrew
 
     if args.debug? && args.verbose?
       puts args
-      puts ENV["HOMEBREW_LIVECHECK_WATCHLIST"] if ENV["HOMEBREW_LIVECHECK_WATCHLIST"].present?
+      puts Homebrew::EnvConfig.livecheck_watchlist if Homebrew::EnvConfig.livecheck_watchlist.present?
     end
 
     formulae_and_casks_to_check = if args.tap

Library/Homebrew/dev-cmd/pr-automerge.rb

@@ -22,14 +22,14 @@ module Homebrew
       flag   "--with-label=",
              description: "Pull requests must have this label."
       comma_array "--without-labels",
-                  description: "Pull requests must not have these labels (default: "\
+                  description: "Pull requests must not have these labels (default: " \
                                "`do not merge`, `new formula`, `automerge-skip`)."
       switch "--without-approval",
              description: "Pull requests do not require approval to be merged."
       switch "--publish",
              description: "Run `brew pr-publish` on matching pull requests."
       switch "--no-autosquash",
-             description: "Instruct `brew pr-publish` to skip automatically reformatting and rewording commits "\
+             description: "Instruct `brew pr-publish` to skip automatically reformatting and rewording commits " \
                           "in the pull request to the preferred format."
       switch "--ignore-failures",
              description: "Include pull requests that have failing status checks."

Library/Homebrew/dev-cmd/pr-publish.rb

@@ -17,7 +17,7 @@ module Homebrew
         Requires write access to the repository.
       EOS
       switch "--no-autosquash",
-             description: "Skip automatically reformatting and rewording commits in the pull request "\
+             description: "Skip automatically reformatting and rewording commits in the pull request " \
                           "to the preferred format, even if supported on the target tap."
       flag   "--branch=",
              description: "Branch to publish to (default: `master`)."

Library/Homebrew/dev-cmd/pr-pull.rb

@@ -33,15 +33,15 @@ module Homebrew
              description: "If the formula specifies a rebuild version, " \
                           "attempt to preserve its value in the generated DSL."
       switch "--no-autosquash",
-             description: "Skip automatically reformatting and rewording commits in the pull request to our "\
+             description: "Skip automatically reformatting and rewording commits in the pull request to our " \
                           "preferred format."
       switch "--branch-okay",
              description: "Do not warn if pulling to a branch besides the repository default (useful for testing)."
       switch "--resolve",
-             description: "When a patch fails to apply, leave in progress and allow user to resolve, "\
+             description: "When a patch fails to apply, leave in progress and allow user to resolve, " \
                           "instead of aborting."
       switch "--warn-on-upload-failure",
-             description: "Warn instead of raising an error if the bottle upload fails. "\
+             description: "Warn instead of raising an error if the bottle upload fails. " \
                           "Useful for repairing bottle uploads that previously failed."
       flag   "--committer=",
              description: "Specify a committer name and email in `git`'s standard author format."
@@ -54,10 +54,10 @@ module Homebrew
       flag   "--root-url=",
              description: "Use the specified <URL> as the root of the bottle's URL instead of Homebrew's default."
       flag   "--root-url-using=",
-             description: "Use the specified download strategy class for downloading the bottle's URL instead of "\
+             description: "Use the specified download strategy class for downloading the bottle's URL instead of " \
                           "Homebrew's default."
       comma_array "--workflows=",
-                  description: "Retrieve artifacts from the specified workflow (default: `tests.yml`). "\
+                  description: "Retrieve artifacts from the specified workflow (default: `tests.yml`). " \
                                "Can be a comma-separated list to include multiple workflows."
       comma_array "--ignore-missing-artifacts=",
                   description: "Comma-separated list of workflows which can be ignored if they have not been run."

Library/Homebrew/dev-cmd/pr-upload.rb

@@ -24,7 +24,7 @@ module Homebrew
       switch "--no-commit",
              description: "Do not generate a new commit before uploading."
       switch "--warn-on-upload-failure",
-             description: "Warn instead of raising an error if the bottle upload fails. "\
+             description: "Warn instead of raising an error if the bottle upload fails. " \
                           "Useful for repairing bottle uploads that previously failed."
       switch "--upload-only",
              description: "Skip running `brew bottle` before uploading."
@@ -34,7 +34,7 @@ module Homebrew
       flag   "--root-url=",
              description: "Use the specified <URL> as the root of the bottle's URL instead of Homebrew's default."
       flag   "--root-url-using=",
-             description: "Use the specified download strategy class for downloading the bottle's URL instead of "\
+             description: "Use the specified download strategy class for downloading the bottle's URL instead of " \
                           "Homebrew's default."
 
       conflicts "--upload-only", "--keep-old"

Library/Homebrew/dev-cmd/prof.rb

@@ -32,7 +32,7 @@ module Homebrew
     if args.stackprof?
       Homebrew.install_gem_setup_path! "stackprof"
       with_env HOMEBREW_STACKPROF: "1" do
-        system ENV["HOMEBREW_RUBY_PATH"], brew_rb, *args.named
+        system RUBY_PATH, brew_rb, *args.named
       end
       output_filename = "prof/d3-flamegraph.html"
       safe_system "stackprof --d3-flamegraph prof/stackprof.dump > #{output_filename}"

Library/Homebrew/dev-cmd/ruby.rb

@@ -33,10 +33,9 @@ module Homebrew
     ruby_sys_args << "-e #{args.e}" if args.e
     ruby_sys_args += args.named
 
-    exec RUBY_PATH,
+    exec(*HOMEBREW_RUBY_EXEC_ARGS,
-         ENV["HOMEBREW_RUBY_WARNINGS"],
          "-I", $LOAD_PATH.join(File::PATH_SEPARATOR),
          "-rglobal", "-rdev-cmd/irb",
-         *ruby_sys_args
+         *ruby_sys_args)
   end
 end

Library/Homebrew/dev-cmd/sh.rb

@@ -38,22 +38,24 @@ module Homebrew
     ENV.setup_build_environment
     if superenv?(args.env)
       # superenv stopped adding brew's bin but generally users will want it
-      ENV["PATH"] = PATH.new(ENV["PATH"]).insert(1, HOMEBREW_PREFIX/"bin")
+      ENV["PATH"] = PATH.new(ENV.fetch("PATH")).insert(1, HOMEBREW_PREFIX/"bin")
     end
 
     ENV["VERBOSE"] = "1" if args.verbose?
 
     if args.cmd.present?
-      safe_system(ENV["SHELL"], "-c", args.cmd)
+      safe_system(preferred_shell, "-c", args.cmd)
     elsif args.named.present?
-      safe_system(ENV["SHELL"], args.named.first)
+      safe_system(preferred_shell, args.named.first)
     else
-      subshell = if ENV["SHELL"].include?("zsh")
+      shell_type = Utils::Shell.preferred
-        "PS1='brew %B%F{green}%~%f%b$ ' #{ENV["SHELL"]} -d -f"
+      subshell = case shell_type
-      elsif ENV["SHELL"].include?("bash")
+      when :zsh
-        "PS1=\"brew \\[\\033[1;32m\\]\\w\\[\\033[0m\\]$ \" #{ENV["SHELL"]} --noprofile --norc"
+        "PS1='brew %B%F{green}%~%f%b$ ' #{preferred_shell} -d -f"
+      when :bash
+        "PS1=\"brew \\[\\033[1;32m\\]\\w\\[\\033[0m\\]$ \" #{preferred_shell} --noprofile --norc"
       else
-        "PS1=\"brew \\[\\033[1;32m\\]\\w\\[\\033[0m\\]$ \" #{ENV["SHELL"]}"
+        "PS1=\"brew \\[\\033[1;32m\\]\\w\\[\\033[0m\\]$ \" #{preferred_shell}"
       end
       puts <<~EOS
         Your shell has been configured to use Homebrew's build environment;

Library/Homebrew/dev-cmd/style.rb

@@ -32,10 +32,10 @@ module Homebrew
       switch "--cask", "--casks",
              description: "Treat all named arguments as casks."
       comma_array "--only-cops",
-                  description: "Specify a comma-separated <cops> list to check for violations of only the "\
+                  description: "Specify a comma-separated <cops> list to check for violations of only the " \
                                "listed RuboCop cops."
       comma_array "--except-cops",
-                  description: "Specify a comma-separated <cops> list to skip checking for violations of the "\
+                  description: "Specify a comma-separated <cops> list to skip checking for violations of the " \
                                "listed RuboCop cops."
 
       conflicts "--formula", "--cask"

Library/Homebrew/dev-cmd/tests.rb

@@ -22,14 +22,14 @@ module Homebrew
       switch "--no-compat",
              description: "Do not load the compatibility layer when running tests."
       switch "--online",
-             description: "Include tests that use the GitHub API and tests that use any of the taps for "\
+             description: "Include tests that use the GitHub API and tests that use any of the taps for " \
                           "official external commands."
       switch "--byebug",
              description: "Enable debugging using byebug."
       switch "--changed",
              description: "Only runs tests on files that were changed from the master branch."
       flag   "--only=",
-             description: "Run only <test_script>`_spec.rb`. Appending `:`<line_number> will start at a "\
+             description: "Run only <test_script>`_spec.rb`. Appending `:`<line_number> will start at a " \
                           "specific line."
       flag   "--seed=",
              description: "Randomise tests with the specified <value> instead of a random seed."
@@ -57,15 +57,15 @@ module Homebrew
                                 reason: "reporting test flakiness")
     end
 
-    ENV["BUILDPULSE_ACCESS_KEY_ID"] = ENV["HOMEBREW_BUILDPULSE_ACCESS_KEY_ID"]
+    ENV["BUILDPULSE_ACCESS_KEY_ID"] = ENV.fetch("HOMEBREW_BUILDPULSE_ACCESS_KEY_ID")
-    ENV["BUILDPULSE_SECRET_ACCESS_KEY"] = ENV["HOMEBREW_BUILDPULSE_SECRET_ACCESS_KEY"]
+    ENV["BUILDPULSE_SECRET_ACCESS_KEY"] = ENV.fetch("HOMEBREW_BUILDPULSE_SECRET_ACCESS_KEY")
 
     ohai "Sending test results to BuildPulse"
 
     safe_system Formula["buildpulse-test-reporter"].opt_bin/"buildpulse-test-reporter",
                 "submit", "#{HOMEBREW_LIBRARY_PATH}/test/junit",
-                "--account-id", ENV["HOMEBREW_BUILDPULSE_ACCOUNT_ID"],
+                "--account-id", ENV.fetch("HOMEBREW_BUILDPULSE_ACCOUNT_ID"),
-                "--repository-id", ENV["HOMEBREW_BUILDPULSE_REPOSITORY_ID"]
+                "--repository-id", ENV.fetch("HOMEBREW_BUILDPULSE_REPOSITORY_ID")
   end
 
   def changed_test_files
@@ -212,7 +212,7 @@ module Homebrew
       ENV["HOMEBREW_TESTS_GEM_USER_DIR"] = gem_user_dir
 
       # Let `bundle` in PATH find its gem.
-      ENV["GEM_PATH"] = "#{ENV["GEM_PATH"]}:#{gem_user_dir}"
+      ENV["GEM_PATH"] = "#{ENV.fetch("GEM_PATH")}:#{gem_user_dir}"
 
       # Submit test flakiness information using BuildPulse
       # BUILDPULSE used in spec_helper.rb

Library/Homebrew/dev-cmd/unbottled.rb

@@ -114,7 +114,7 @@ module Homebrew
       end.compact
       @sort = " (sorted by installs in the last 90 days; top 10,000 only)"
 
-      all_formulae = Formula
+      all_formulae = Formula.all
     end
 
     [formulae, all_formulae, formula_installs]

Library/Homebrew/dev-cmd/unpack.rb

@@ -22,7 +22,7 @@ module Homebrew
       switch "--patch",
              description: "Patches for <formula> will be applied to the unpacked source."
       switch "-g", "--git",
-             description: "Initialise a Git repository in the unpacked source. This is useful for creating "\
+             description: "Initialise a Git repository in the unpacked source. This is useful for creating " \
                           "patches for the software."
       switch "-f", "--force",
              description: "Overwrite the destination directory if it already exists."

Library/Homebrew/dev-cmd/update-python-resources.rb

@@ -22,10 +22,10 @@ module Homebrew
       switch "--ignore-non-pypi-packages",
              description: "Don't fail if <formula> is not a PyPI package."
       flag   "--version=",
-             description: "Use the specified <version> when finding resources for <formula>. "\
+             description: "Use the specified <version> when finding resources for <formula>. " \
                           "If no version is specified, the current version for <formula> will be used."
       flag   "--package-name=",
-             description: "Use the specified <package-name> when finding resources for <formula>. "\
+             description: "Use the specified <package-name> when finding resources for <formula>. " \
                           "If no package name is specified, it will be inferred from the formula's stable URL."
       comma_array "--extra-packages=",
                   description: "Include these additional packages when finding resources."

Library/Homebrew/dev-cmd/update-test.rb

@@ -123,7 +123,7 @@ module Homebrew
       safe_system "git", "reset", "--hard", start_commit
 
       # update ENV["PATH"]
-      ENV["PATH"] = PATH.new(ENV["PATH"]).prepend(curdir/"bin")
+      ENV["PATH"] = PATH.new(ENV.fetch("PATH")).prepend(curdir/"bin")
 
       # run brew help to install portable-ruby (if needed)
       quiet_system "brew", "help"

Library/Homebrew/development_tools.rb

@@ -118,7 +118,7 @@ class DevelopmentTools
     sig { returns(T::Hash[String, T.nilable(String)]) }
     def build_system_info
       {
-        "os"         => ENV["HOMEBREW_SYSTEM"],
+        "os"         => HOMEBREW_SYSTEM,
         "os_version" => OS_VERSION,
         "cpu_family" => Hardware::CPU.family.to_s,
       }

Library/Homebrew/diagnostic.rb

@@ -70,7 +70,7 @@ module Homebrew
       end
 
       def user_tilde(path)
-        path.gsub(ENV["HOME"], "~")
+        path.gsub(Dir.home, "~")
       end
 
       sig { returns(String) }
@@ -541,7 +541,7 @@ module Homebrew
       end
 
       def check_git_version
-        minimum_version = ENV["HOMEBREW_MINIMUM_GIT_VERSION"]
+        minimum_version = ENV.fetch("HOMEBREW_MINIMUM_GIT_VERSION")
         return unless Utils::Git.available?
         return if Version.create(Utils::Git.version) >= Version.create(minimum_version)
 
@@ -668,7 +668,7 @@ module Homebrew
       end
 
       def check_tmpdir
-        tmpdir = ENV["TMPDIR"]
+        tmpdir = ENV.fetch("TMPDIR", nil)
         return if tmpdir.nil? || File.directory?(tmpdir)
 
         <<~EOS
@@ -766,7 +766,7 @@ module Homebrew
       end
 
       def check_for_pydistutils_cfg_in_home
-        return unless File.exist? "#{ENV["HOME"]}/.pydistutils.cfg"
+        return unless File.exist? "#{Dir.home}/.pydistutils.cfg"
 
         <<~EOS
           A '.pydistutils.cfg' file was found in $HOME, which may cause Python
@@ -828,7 +828,7 @@ module Homebrew
         cmd_map.reject! { |_cmd_name, cmd_paths| cmd_paths.size == 1 }
         return if cmd_map.empty?
 
-        if ENV["CI"] && cmd_map.keys.length == 1 &&
+        if ENV["CI"].present? && cmd_map.keys.length == 1 &&
            cmd_map.keys.first == "brew-test-bot"
           return
         end
@@ -1007,7 +1007,7 @@ module Homebrew
         add_info "Cask Environment Variables:", ((locale_variables + environment_variables).sort.each do |var|
           next unless ENV.key?(var)
 
-          var = %Q(#{var}="#{ENV[var]}")
+          var = %Q(#{var}="#{ENV.fetch(var)}")
           user_tilde(var)
         end)
       end

Library/Homebrew/download_strategy.rb

@@ -1139,7 +1139,7 @@ class CVSDownloadStrategy < VCSDownloadStrategy
   private
 
   def env
-    { "PATH" => PATH.new("/usr/bin", Formula["cvs"].opt_bin, ENV["PATH"]) }
+    { "PATH" => PATH.new("/usr/bin", Formula["cvs"].opt_bin, ENV.fetch("PATH")) }
   end
 
   sig { returns(String) }
@@ -1214,7 +1214,7 @@ class MercurialDownloadStrategy < VCSDownloadStrategy
   private
 
   def env
-    { "PATH" => PATH.new(Formula["mercurial"].opt_bin, ENV["PATH"]) }
+    { "PATH" => PATH.new(Formula["mercurial"].opt_bin, ENV.fetch("PATH")) }
   end
 
   sig { returns(String) }
@@ -1280,7 +1280,7 @@ class BazaarDownloadStrategy < VCSDownloadStrategy
 
   def env
     {
-      "PATH"     => PATH.new(Formula["bazaar"].opt_bin, ENV["PATH"]),
+      "PATH"     => PATH.new(Formula["bazaar"].opt_bin, ENV.fetch("PATH")),
       "BZR_HOME" => HOMEBREW_TEMP,
     }
   end
@@ -1345,7 +1345,7 @@ class FossilDownloadStrategy < VCSDownloadStrategy
   private
 
   def env
-    { "PATH" => PATH.new(Formula["fossil"].opt_bin, ENV["PATH"]) }
+    { "PATH" => PATH.new(Formula["fossil"].opt_bin, ENV.fetch("PATH")) }
   end
 
   sig { returns(String) }

Library/Homebrew/env_config.rb

@@ -49,7 +49,7 @@ module Homebrew
         default_text: "`$BAT_THEME`.",
       },
       HOMEBREW_BOOTSNAP:                         {
-        description: "If set, use Bootsnap to speed up repeated `brew` calls. "\
+        description: "If set, use Bootsnap to speed up repeated `brew` calls. " \
                      "A no-op when using Homebrew's vendored, relocatable Ruby on macOS (as it doesn't work).",
         boolean:     true,
       },
@@ -82,8 +82,8 @@ module Homebrew
         description: "Append these options to all `cask` commands. All `--*dir` options, " \
                      "`--language`, `--require-sha`, `--no-quarantine` and `--no-binaries` are supported. " \
                      "For example, you might add something like the following to your " \
-                     "`~/.profile`, `~/.bash_profile`, or `~/.zshenv`:\n\n" \
+                     "`~/.profile`, `~/.bash_profile`, or `~/.zshenv`:" \
-                     '    `export HOMEBREW_CASK_OPTS="--appdir=~/Applications --fontdir=/Library/Fonts"`',
+                     '\n\n    `export HOMEBREW_CASK_OPTS="--appdir=~/Applications --fontdir=/Library/Fonts"`',
       },
       HOMEBREW_CLEANUP_PERIODIC_FULL_DAYS:       {
         description: "If set, `brew install`, `brew upgrade` and `brew reinstall` will cleanup all formulae " \
@@ -184,7 +184,7 @@ module Homebrew
                      "developer commands may require additional permissions.",
       },
       HOMEBREW_GITHUB_PACKAGES_TOKEN:            {
-        description: "Use this GitHub personal access token when accessing the GitHub Packages Registry "\
+        description: "Use this GitHub personal access token when accessing the GitHub Packages Registry " \
                      "(where bottles may be stored).",
       },
       HOMEBREW_DOCKER_REGISTRY_BASIC_AUTH_TOKEN: {
@@ -221,9 +221,10 @@ module Homebrew
         boolean:     true,
       },
       HOMEBREW_LIVECHECK_WATCHLIST:              {
-        description: "Consult this file for the list of formulae to check by default when no formula argument " \
+        description:  "Consult this file for the list of formulae to check by default when no formula argument " \
-                     "is passed to `brew livecheck`.",
+                      "is passed to `brew livecheck`.",
-        default:     "$HOME/.brew_livecheck_watchlist",
+        default_text: "`$HOME/.brew_livecheck_watchlist`",
+        default:      "~/.brew_livecheck_watchlist",
       },
       HOMEBREW_LOGS:                             {
         description:  "Use this directory to store log files.",
@@ -257,7 +258,7 @@ module Homebrew
       HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK:    {
         description: "If set, do not check for broken linkage of dependents or outdated dependents after " \
                      "installing, upgrading or reinstalling formulae. This will result in fewer dependents " \
-                     " (and their dependencies) being upgraded or reinstalled but may result in more breakage " \
+                     "(and their dependencies) being upgraded or reinstalled but may result in more breakage " \
                      "from running `brew install <formula>` or `brew upgrade <formula>`.",
         boolean:     true,
       },

Library/Homebrew/extend/ENV/std.rb

@@ -28,7 +28,7 @@ module Stdenv
 
     self["HOMEBREW_ENV"] = "std"
 
-    PATH.new(ENV["HOMEBREW_PATH"]).reverse_each { |p| prepend_path "PATH", p }
+    ORIGINAL_PATHS.reverse_each { |p| prepend_path "PATH", p }
     prepend_path "PATH", HOMEBREW_SHIMS_PATH/"shared"
 
     # Set the default pkg-config search path, overriding the built-in paths

Library/Homebrew/extend/on_os.rb

@@ -1,26 +0,0 @@
-# typed: strict
-# frozen_string_literal: true
-
-module OnOS
-  extend T::Sig
-
-  # Block only executed on macOS. No-op on Linux.
-  # <pre>on_macos do
-  # # Do something Mac-specific
-  # end</pre>
-  sig { params(block: T.proc.void).void }
-  def on_macos(&block)
-    raise "No block content defined for 'on_macos' block" unless T.unsafe(block)
-  end
-
-  # Block only executed on Linux. No-op on macOS.
-  # <pre>on_linux do
-  # # Do something Linux-specific
-  # end</pre>
-  sig { params(block: T.proc.void).void }
-  def on_linux(&block)
-    raise "No block content defined for 'on_linux' block" unless T.unsafe(block)
-  end
-end
-
-require "extend/os/on_os"

Library/Homebrew/extend/on_os.rbi

@@ -1,5 +0,0 @@
-# typed: strict
-
-module OnOS
-  include Kernel
-end

Library/Homebrew/extend/on_system.rb

@@ -0,0 +1,103 @@
+# typed: false
+# frozen_string_literal: true
+
+require "simulate_system"
+
+module OnSystem
+  extend T::Sig
+
+  ARCH_OPTIONS = [:intel, :arm].freeze
+  BASE_OS_OPTIONS = [:macos, :linux].freeze
+
+  module_function
+
+  sig { params(arch: Symbol).returns(T::Boolean) }
+  def arch_condition_met?(arch)
+    raise ArgumentError, "Invalid arch condition: #{arch.inspect}" if ARCH_OPTIONS.exclude?(arch)
+
+    current_arch = Homebrew::SimulateSystem.arch || Hardware::CPU.type
+    arch == current_arch
+  end
+
+  sig { params(os_name: Symbol, or_condition: T.nilable(Symbol)).returns(T::Boolean) }
+  def os_condition_met?(os_name, or_condition = nil)
+    if Homebrew::EnvConfig.simulate_macos_on_linux?
+      return false if os_name == :linux
+      return true if [:macos, *MacOSVersions::SYMBOLS.keys].include?(os_name)
+    end
+
+    if BASE_OS_OPTIONS.include?(os_name)
+      if Homebrew::SimulateSystem.none?
+        return OS.linux? if os_name == :linux
+        return OS.mac? if os_name == :macos
+      end
+
+      return Homebrew::SimulateSystem.send("#{os_name}?")
+    end
+
+    raise ArgumentError, "Invalid OS condition: #{os_name.inspect}" unless MacOSVersions::SYMBOLS.key?(os_name)
+
+    if or_condition.present? && [:or_newer, :or_older].exclude?(or_condition)
+      raise ArgumentError, "Invalid OS `or_*` condition: #{or_condition.inspect}"
+    end
+
+    base_os = MacOS::Version.from_symbol(os_name)
+    current_os = MacOS::Version.from_symbol(Homebrew::SimulateSystem.os || MacOS.version.to_sym)
+
+    return current_os >= base_os if or_condition == :or_newer
+    return current_os <= base_os if or_condition == :or_older
+
+    current_os == base_os
+  end
+
+  sig { params(method_name: Symbol).returns(Symbol) }
+  def condition_from_method_name(method_name)
+    method_name.to_s.sub(/^on_/, "").to_sym
+  end
+
+  sig { params(base: Class).void }
+  def self.included(base)
+    ARCH_OPTIONS.each do |arch|
+      base.define_method("on_#{arch}") do |&block|
+        @on_system_blocks_exist = true
+
+        return unless OnSystem.arch_condition_met? OnSystem.condition_from_method_name(__method__)
+
+        @called_in_on_system_block = true
+        result = block.call
+        @called_in_on_system_block = false
+
+        result
+      end
+    end
+
+    BASE_OS_OPTIONS.each do |base_os|
+      base.define_method("on_#{base_os}") do |&block|
+        @on_system_blocks_exist = true
+
+        return unless OnSystem.os_condition_met? OnSystem.condition_from_method_name(__method__)
+
+        @called_in_on_system_block = true
+        result = block.call
+        @called_in_on_system_block = false
+
+        result
+      end
+    end
+
+    MacOSVersions::SYMBOLS.each_key do |os_name|
+      base.define_method("on_#{os_name}") do |or_condition = nil, &block|
+        @on_system_blocks_exist = true
+
+        os_condition = OnSystem.condition_from_method_name __method__
+        return unless OnSystem.os_condition_met? os_condition, or_condition
+
+        @called_in_on_system_block = true
+        result = block.call
+        @called_in_on_system_block = false
+
+        result
+      end
+    end
+  end
+end

Library/Homebrew/extend/os/linux/on_os.rb

@@ -1,10 +0,0 @@
-# typed: strict
-# frozen_string_literal: true
-
-module OnOS
-  def on_linux(&block)
-    raise "No block content defined for 'on_linux' block" unless T.unsafe(block)
-
-    yield
-  end
-end

Library/Homebrew/extend/os/mac/on_os.rb

@@ -1,10 +0,0 @@
-# typed: strict
-# frozen_string_literal: true
-
-module OnOS
-  def on_macos(&block)
-    raise "No block content defined for 'on_macos' block" unless T.unsafe(block)
-
-    yield
-  end
-end

Library/Homebrew/extend/os/on_os.rb

@@ -1,8 +0,0 @@
-# typed: strict
-# frozen_string_literal: true
-
-if OS.mac? || Homebrew::EnvConfig.simulate_macos_on_linux?
-  require "extend/os/mac/on_os"
-elsif OS.linux?
-  require "extend/os/linux/on_os"
-end

Library/Homebrew/formula.rb

@@ -28,7 +28,7 @@ require "tab"
 require "mktemp"
 require "find"
 require "utils/spdx"
-require "extend/on_os"
+require "extend/on_system"
 require "api"
 
 # A formula provides instructions and metadata for Homebrew to install a piece
@@ -64,7 +64,7 @@ class Formula
   include Utils::Shebang
   include Utils::Shell
   include Context
-  include OnOS
+  include OnSystem
   extend Forwardable
   extend Cachable
   extend Predicable
@@ -421,9 +421,9 @@ class Formula
     return unless head.downloader.cached_location.exist?
 
     path = if ENV["HOMEBREW_ENV"]
-      ENV["PATH"]
+      ENV.fetch("PATH")
     else
-      ENV["HOMEBREW_PATH"]
+      PATH.new(ORIGINAL_PATHS)
     end
 
     with_env(PATH: path) do
@@ -1103,7 +1103,7 @@ class Formula
         TMP:           HOMEBREW_TEMP,
         _JAVA_OPTIONS: "-Djava.io.tmpdir=#{HOMEBREW_TEMP}",
         HOMEBREW_PATH: nil,
-        PATH:          ENV["HOMEBREW_PATH"],
+        PATH:          PATH.new(ORIGINAL_PATHS),
       }
 
       with_env(new_env) do
@@ -2077,7 +2077,7 @@ class Formula
       TEMP:          HOMEBREW_TEMP,
       TMP:           HOMEBREW_TEMP,
       TERM:          "dumb",
-      PATH:          PATH.new(ENV["PATH"], HOMEBREW_PREFIX/"bin"),
+      PATH:          PATH.new(ENV.fetch("PATH"), HOMEBREW_PREFIX/"bin"),
       HOMEBREW_PATH: nil,
     }.merge(common_stage_test_env)
     test_env[:_JAVA_OPTIONS] += " -Djava.io.tmpdir=#{HOMEBREW_TEMP}"
@@ -2433,7 +2433,7 @@ class Formula
       GOCACHE:       "#{HOMEBREW_CACHE}/go_cache",
       GOPATH:        "#{HOMEBREW_CACHE}/go_mod_cache",
       CARGO_HOME:    "#{HOMEBREW_CACHE}/cargo_cache",
-      CURL_HOME:     ENV["CURL_HOME"] || ENV["HOME"],
+      CURL_HOME:     ENV.fetch("CURL_HOME") { Dir.home },
     }
   end
 
@@ -2470,7 +2470,7 @@ class Formula
   # The methods below define the formula DSL.
   class << self
     include BuildEnvironment::DSL
-    include OnOS
+    include OnSystem
 
     def method_added(method)
       super

Library/Homebrew/formula.rbi

@@ -48,4 +48,7 @@ class Formula
 
   def env; end
   def conflicts; end
+
+  # This method is included by `OnSystem`
+  def self.on_macos(&block); end
 end

Library/Homebrew/formula_cellar_checks.rb

@@ -291,7 +291,7 @@ module FormulaCellarChecks
 
     dot_brew_formula = formula.prefix/".brew/#{formula.name}.rb"
     return unless dot_brew_formula.exist?
-    # TODO: add methods to `utils/ast` to allow checking for method use
+
     return unless dot_brew_formula.read.include? "ENV.runtime_cpu_detection"
 
     # macOS `objdump` is a bit slow, so we prioritise llvm's `llvm-objdump` (~5.7x faster)
@@ -299,7 +299,7 @@ module FormulaCellarChecks
     objdump   = Formula["llvm"].opt_bin/"llvm-objdump" if Formula["llvm"].any_version_installed?
     objdump ||= Formula["binutils"].opt_bin/"objdump" if Formula["binutils"].any_version_installed?
     objdump ||= which("objdump")
-    objdump ||= which("objdump", ENV["HOMEBREW_PATH"])
+    objdump ||= which("objdump", ORIGINAL_PATHS)
 
     unless objdump
       return <<~EOS

Library/Homebrew/formula_installer.rb

@@ -823,6 +823,7 @@ class FormulaInstaller
     if formula.name == "curl" &&
        !DevelopmentTools.curl_handles_most_https_certificates?
       ENV["HOMEBREW_CURL"] = formula.opt_bin/"curl"
+      Utils::Curl.clear_path_cache
     end
 
     caveats
@@ -903,7 +904,7 @@ class FormulaInstaller
         sandbox = Sandbox.new
         formula.logs.mkpath
         sandbox.record_log(formula.logs/"build.sandbox.log")
-        sandbox.allow_write_path(ENV["HOME"]) if interactive?
+        sandbox.allow_write_path(Dir.home) if interactive?
         sandbox.allow_write_temp_and_cache
         sandbox.allow_write_log(formula)
         sandbox.allow_cvs
@@ -1083,12 +1084,12 @@ class FormulaInstaller
 
   sig { void }
   def post_install
-    args = %W[
+    args = [
-      nice #{RUBY_PATH}
+      "nice",
-      #{ENV["HOMEBREW_RUBY_WARNINGS"]}
+      *HOMEBREW_RUBY_EXEC_ARGS,
-      -I #{$LOAD_PATH.join(File::PATH_SEPARATOR)}
+      "-I", $LOAD_PATH.join(File::PATH_SEPARATOR),
-      --
+      "--",
-      #{HOMEBREW_LIBRARY_PATH}/postinstall.rb
+      HOMEBREW_LIBRARY_PATH/"postinstall.rb"
     ]
 
     # Use the formula from the keg if:

Library/Homebrew/formulary.rb

@@ -641,7 +641,7 @@ module Formulary
     when URL_START_REGEX
       return FromUrlLoader.new(ref)
     when HOMEBREW_TAP_FORMULA_REGEX
-      if ref.start_with?("homebrew/core/") && !CoreTap.instance.installed? && Homebrew::EnvConfig.install_from_api?
+      if ref.start_with?("homebrew/core/") && Homebrew::EnvConfig.install_from_api?
         name = ref.split("/", 3).last
         return FormulaAPILoader.new(name) if Homebrew::API::Formula.all_formulae.key?(name)
       end
@@ -651,18 +651,16 @@ module Formulary
 
     return FromPathLoader.new(ref) if File.extname(ref) == ".rb" && Pathname.new(ref).expand_path.exist?
 
+    if Homebrew::EnvConfig.install_from_api? && Homebrew::API::Formula.all_formulae.key?(ref)
+      return FormulaAPILoader.new(ref)
+    end
+
     formula_with_that_name = core_path(ref)
     return FormulaLoader.new(ref, formula_with_that_name) if formula_with_that_name.file?
 
     possible_alias = CoreTap.instance.alias_dir/ref
     return AliasLoader.new(possible_alias) if possible_alias.file?
 
-    if !CoreTap.instance.installed? &&
-       Homebrew::EnvConfig.install_from_api? &&
-       Homebrew::API::Formula.all_formulae.key?(ref)
-      return FormulaAPILoader.new(ref)
-    end
-
     possible_tap_formulae = tap_paths(ref)
     raise TapFormulaAmbiguityError.new(ref, possible_tap_formulae) if possible_tap_formulae.size > 1
 

Library/Homebrew/global.rb

@@ -34,25 +34,28 @@ ActiveSupport::Inflector.inflections(:en) do |inflect|
   inflect.irregular "it", "they"
 end
 
-HOMEBREW_BOTTLE_DEFAULT_DOMAIN = ENV["HOMEBREW_BOTTLE_DEFAULT_DOMAIN"]
+HOMEBREW_BOTTLE_DEFAULT_DOMAIN = ENV.fetch("HOMEBREW_BOTTLE_DEFAULT_DOMAIN").freeze
-HOMEBREW_BREW_DEFAULT_GIT_REMOTE = ENV["HOMEBREW_BREW_DEFAULT_GIT_REMOTE"]
+HOMEBREW_BREW_DEFAULT_GIT_REMOTE = ENV.fetch("HOMEBREW_BREW_DEFAULT_GIT_REMOTE").freeze
-HOMEBREW_CORE_DEFAULT_GIT_REMOTE = ENV["HOMEBREW_CORE_DEFAULT_GIT_REMOTE"]
+HOMEBREW_CORE_DEFAULT_GIT_REMOTE = ENV.fetch("HOMEBREW_CORE_DEFAULT_GIT_REMOTE").freeze
-HOMEBREW_DEFAULT_CACHE = ENV["HOMEBREW_DEFAULT_CACHE"]
+HOMEBREW_DEFAULT_CACHE = ENV.fetch("HOMEBREW_DEFAULT_CACHE").freeze
-HOMEBREW_DEFAULT_LOGS = ENV["HOMEBREW_DEFAULT_LOGS"]
+HOMEBREW_DEFAULT_LOGS = ENV.fetch("HOMEBREW_DEFAULT_LOGS").freeze
-HOMEBREW_DEFAULT_TEMP = ENV["HOMEBREW_DEFAULT_TEMP"]
+HOMEBREW_DEFAULT_TEMP = ENV.fetch("HOMEBREW_DEFAULT_TEMP").freeze
-HOMEBREW_REQUIRED_RUBY_VERSION = ENV["HOMEBREW_REQUIRED_RUBY_VERSION"]
+HOMEBREW_REQUIRED_RUBY_VERSION = ENV.fetch("HOMEBREW_REQUIRED_RUBY_VERSION").freeze
 
-HOMEBREW_PRODUCT = ENV["HOMEBREW_PRODUCT"]
+HOMEBREW_PRODUCT = ENV.fetch("HOMEBREW_PRODUCT").freeze
-HOMEBREW_VERSION = ENV["HOMEBREW_VERSION"]
+HOMEBREW_VERSION = ENV.fetch("HOMEBREW_VERSION").freeze
 HOMEBREW_WWW = "https://brew.sh"
+HOMEBREW_SYSTEM = ENV.fetch("HOMEBREW_SYSTEM").freeze
+HOMEBREW_PROCESSOR = ENV.fetch("HOMEBREW_PROCESSOR").freeze
 
-HOMEBREW_USER_AGENT_CURL = ENV["HOMEBREW_USER_AGENT_CURL"]
+HOMEBREW_BREWED_CURL_PATH = Pathname(ENV.fetch("HOMEBREW_BREWED_CURL_PATH")).freeze
+HOMEBREW_USER_AGENT_CURL = ENV.fetch("HOMEBREW_USER_AGENT_CURL").freeze
 HOMEBREW_USER_AGENT_RUBY =
-  "#{ENV["HOMEBREW_USER_AGENT"]} ruby/#{RUBY_VERSION}-p#{RUBY_PATCHLEVEL}"
+  "#{ENV.fetch("HOMEBREW_USER_AGENT")} ruby/#{RUBY_VERSION}-p#{RUBY_PATCHLEVEL}"
 HOMEBREW_USER_AGENT_FAKE_SAFARI =
   "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_3) AppleWebKit/602.4.8 " \
   "(KHTML, like Gecko) Version/10.0.3 Safari/602.4.8"
-HOMEBREW_GITHUB_PACKAGES_AUTH = ENV["HOMEBREW_GITHUB_PACKAGES_AUTH"]
+HOMEBREW_GITHUB_PACKAGES_AUTH = ENV.fetch("HOMEBREW_GITHUB_PACKAGES_AUTH").freeze
 
 HOMEBREW_DEFAULT_PREFIX = "/usr/local"
 HOMEBREW_DEFAULT_REPOSITORY = "#{HOMEBREW_DEFAULT_PREFIX}/Homebrew"
@@ -69,6 +72,7 @@ HOMEBREW_BOTTLES_EXTNAME_REGEX = /\.([a-z0-9_]+)\.bottle\.(?:(\d+)\.)?tar\.gz$/.
 
 require "env_config"
 require "compat/early" unless Homebrew::EnvConfig.no_compat?
+require "macos_versions"
 require "os"
 require "messages"
 require "default_prefix"
@@ -116,8 +120,8 @@ require "cli/args"
 
 require "PATH"
 
-ENV["HOMEBREW_PATH"] ||= ENV["PATH"]
+ENV["HOMEBREW_PATH"] ||= ENV.fetch("PATH")
-ORIGINAL_PATHS = PATH.new(ENV["HOMEBREW_PATH"]).map do |p|
+ORIGINAL_PATHS = PATH.new(ENV.fetch("HOMEBREW_PATH")).map do |p|
   Pathname.new(p).expand_path
 rescue
   nil

Library/Homebrew/language/python.rb

@@ -26,7 +26,7 @@ module Language
     end
 
     def self.each_python(build, &block)
-      original_pythonpath = ENV["PYTHONPATH"]
+      original_pythonpath = ENV.fetch("PYTHONPATH", nil)
       pythons = { "python@3" => "python3",
                   "pypy"     => "pypy",
                   "pypy3"    => "pypy3" }

Library/Homebrew/livecheck/livecheck.rb

@@ -563,6 +563,7 @@ module Homebrew
 
     # Identifies the latest version of the formula and returns a Hash containing
     # the version information. Returns nil if a latest version couldn't be found.
+    # rubocop:disable Metrics/CyclomaticComplexity
     sig {
       params(
         formula_or_cask:            T.any(Formula, Cask::Cask),
@@ -657,7 +658,7 @@ module Homebrew
         end
 
         if livecheck_strategy.present?
-          if livecheck_url.blank?
+          if livecheck_url.blank? && strategy.method(:find_versions).parameters.include?([:keyreq, :url])
             odebug "#{strategy_name} strategy requires a URL"
             next
           elsif livecheck_strategy != :page_match && strategies.exclude?(strategy)
@@ -768,6 +769,7 @@ module Homebrew
 
       nil
     end
+    # rubocop:enable Metrics/CyclomaticComplexity
   end
   # rubocop:enable Metrics/ModuleLength
 end

Library/Homebrew/livecheck/strategy/extract_plist.rb

@@ -82,25 +82,37 @@ module Homebrew
         # versions from `plist` files.
         #
         # @param cask [Cask::Cask] the cask to check for version information
+        # @param url [String, nil] an alternative URL to check for version
+        #   information
         # @param regex [Regexp, nil] a regex for use in a strategy block
         # @return [Hash]
         sig {
           params(
             cask:    Cask::Cask,
+            url:     T.nilable(String),
             regex:   T.nilable(Regexp),
             _unused: T.nilable(T::Hash[Symbol, T.untyped]),
             block:   T.untyped,
           ).returns(T::Hash[Symbol, T.untyped])
         }
-        def self.find_versions(cask:, regex: nil, **_unused, &block)
+        def self.find_versions(cask:, url: nil, regex: nil, **_unused, &block)
           if regex.present? && block.blank?
             raise ArgumentError, "#{T.must(name).demodulize} only supports a regex when using a `strategy` block"
           end
           raise ArgumentError, "The #{T.must(name).demodulize} strategy only supports casks." unless T.unsafe(cask)
 
-          match_data = { matches: {}, regex: regex }
+          match_data = { matches: {}, regex: regex, url: url }
+
+          unversioned_cask_checker = if url.present? && url != cask.url.to_s
+            # Create a copy of the `cask` that uses the `livecheck` block URL
+            cask_copy = Cask::CaskLoader.load(cask.full_name)
+            cask_copy.allow_reassignment = true
+            cask_copy.url { url }
+            UnversionedCaskChecker.new(cask_copy)
+          else
+            UnversionedCaskChecker.new(cask)
+          end
 
-          unversioned_cask_checker = UnversionedCaskChecker.new(cask)
           items = unversioned_cask_checker.all_versions.transform_values { |v| Item.new(bundle_version: v) }
 
           versions_from_items(items, regex, &block).each do |version_text|

Library/Homebrew/livecheck/strategy/sparkle.rb

@@ -110,7 +110,7 @@ module Homebrew
             version ||= item.elements["version"]&.text&.strip
 
             title = item.elements["title"]&.text&.strip
-            pub_date = item.elements["pubDate"]&.text&.strip&.presence&.yield_self do |date_string|
+            pub_date = item.elements["pubDate"]&.text&.strip&.presence&.then do |date_string|
               Time.parse(date_string)
             rescue ArgumentError
               # Omit unparseable strings (e.g. non-English dates)

Library/Homebrew/macos_versions.rb

@@ -0,0 +1,20 @@
+# typed: true
+# frozen_string_literal: true
+
+# Helper functions for querying operating system information.
+#
+# @api private
+module MacOSVersions
+  # TODO: when removing symbols here, ensure that they are added to
+  # DEPRECATED_MACOS_VERSIONS in MacOSRequirement.
+  SYMBOLS = {
+    ventura:     "13",
+    monterey:    "12",
+    big_sur:     "11",
+    catalina:    "10.15",
+    mojave:      "10.14",
+    high_sierra: "10.13",
+    sierra:      "10.12",
+    el_capitan:  "10.11",
+  }.freeze
+end

Library/Homebrew/os.rb

@@ -43,7 +43,7 @@ module OS
     @kernel_name ||= Utils.safe_popen_read("uname", "-s").chomp
   end
 
-  ::OS_VERSION = ENV["HOMEBREW_OS_VERSION"]
+  ::OS_VERSION = ENV.fetch("HOMEBREW_OS_VERSION").freeze
 
   CI_GLIBC_VERSION = "2.23"
   CI_OS_VERSION = "Ubuntu 16.04"
@@ -54,8 +54,8 @@ module OS
     if !OS::Mac.version.prerelease? &&
        !OS::Mac.version.outdated_release? &&
        ARGV.none? { |v| v.start_with?("--cc=") } &&
-       (ENV["HOMEBREW_PREFIX"] == HOMEBREW_DEFAULT_PREFIX ||
+       (HOMEBREW_PREFIX == HOMEBREW_DEFAULT_PREFIX ||
-       (ENV["HOMEBREW_PREFIX"] == HOMEBREW_MACOS_ARM_DEFAULT_PREFIX && Hardware::CPU.arm?))
+       (HOMEBREW_PREFIX == HOMEBREW_MACOS_ARM_DEFAULT_PREFIX && Hardware::CPU.arm?))
       ISSUES_URL = "https://docs.brew.sh/Troubleshooting"
     end
     PATH_OPEN = "/usr/bin/open"

Library/Homebrew/os/linux.rb

@@ -31,11 +31,7 @@ module OS
   module Mac
     module_function
 
-    # rubocop:disable Naming/ConstantName
-    # rubocop:disable Style/MutableConstant
     ::MacOS = OS::Mac
-    # rubocop:enable Naming/ConstantName
-    # rubocop:enable Style/MutableConstant
 
     raise "Loaded OS::Linux on generic OS!" if ENV["HOMEBREW_TEST_GENERIC_OS"]
 

Library/Homebrew/os/mac.rb

@@ -13,14 +13,13 @@ module OS
 
     module_function
 
-    # rubocop:disable Naming/ConstantName
-    # rubocop:disable Style/MutableConstant
     ::MacOS = OS::Mac
-    # rubocop:enable Naming/ConstantName
-    # rubocop:enable Style/MutableConstant
 
     raise "Loaded OS::Mac on generic OS!" if ENV["HOMEBREW_TEST_GENERIC_OS"]
 
+    VERSION = ENV.fetch("HOMEBREW_MACOS_VERSION").chomp.freeze
+    private_constant :VERSION
+
     # This can be compared to numerics, strings, or symbols
     # using the standard Ruby Comparable methods.
     sig { returns(Version) }
@@ -35,7 +34,7 @@ module OS
       @full_version ||= if ENV["HOMEBREW_FAKE_EL_CAPITAN"] # for Portable Ruby building
         Version.new("10.11.6")
       else
-        Version.new((ENV["HOMEBREW_MACOS_VERSION"]).chomp)
+        Version.new(VERSION)
       end
     end
 

Library/Homebrew/os/mac/version.rb

@@ -13,22 +13,10 @@ module OS
     class Version < ::Version
       extend T::Sig
 
-      # TODO: when removing symbols here, ensure that they are added to
-      # DEPRECATED_MACOS_VERSIONS in MacOSRequirement.
-      SYMBOLS = {
-        ventura:     "13",
-        monterey:    "12",
-        big_sur:     "11",
-        catalina:    "10.15",
-        mojave:      "10.14",
-        high_sierra: "10.13",
-        sierra:      "10.12",
-        el_capitan:  "10.11",
-      }.freeze
-
       # TODO: bump version when new macOS is released or announced
-      # and also update references in docs/Installation.md and
+      # and also update references in docs/Installation.md,
-      # https://github.com/Homebrew/install/blob/HEAD/install.sh
+      # https://github.com/Homebrew/install/blob/HEAD/install.sh and
+      # MacOSVersions::SYMBOLS
       NEWEST_UNSUPPORTED = "13"
       private_constant :NEWEST_UNSUPPORTED
 
@@ -42,7 +30,7 @@ module OS
 
       sig { params(version: Symbol).returns(T.attached_class) }
       def self.from_symbol(version)
-        str = SYMBOLS.fetch(version) { raise MacOSVersionError, version }
+        str = MacOSVersions::SYMBOLS.fetch(version) { raise MacOSVersionError, version }
         new(str)
       end
 
@@ -60,10 +48,10 @@ module OS
       sig { override.params(other: T.untyped).returns(T.nilable(Integer)) }
       def <=>(other)
         @comparison_cache.fetch(other) do
-          if SYMBOLS.key?(other) && to_sym == other
+          if MacOSVersions::SYMBOLS.key?(other) && to_sym == other
             0
           else
-            v = SYMBOLS.fetch(other) { other.to_s }
+            v = MacOSVersions::SYMBOLS.fetch(other) { other.to_s }
             @comparison_cache[other] = super(::Version.new(v))
           end
         end
@@ -81,7 +69,7 @@ module OS
 
       sig { returns(Symbol) }
       def to_sym
-        @to_sym ||= SYMBOLS.invert.fetch(strip_patch.to_s, :dunno)
+        @to_sym ||= MacOSVersions::SYMBOLS.invert.fetch(strip_patch.to_s, :dunno)
       end
 
       sig { returns(String) }

Library/Homebrew/pkg_version.rb

@@ -52,6 +52,6 @@ class PkgVersion
   alias eql? ==
 
   def hash
-    version.hash ^ revision.hash
+    [version, revision].hash
   end
 end

Library/Homebrew/requirement.rb

@@ -103,7 +103,7 @@ class Requirement
     parent = satisfied_result_parent
     return unless parent
     return if ["#{HOMEBREW_PREFIX}/bin", "#{HOMEBREW_PREFIX}/bin"].include?(parent.to_s)
-    return if PATH.new(ENV["PATH"]).include?(parent.to_s)
+    return if PATH.new(ENV.fetch("PATH")).include?(parent.to_s)
 
     ENV.prepend_path("PATH", parent)
   end
@@ -122,7 +122,7 @@ class Requirement
   alias eql? ==
 
   def hash
-    name.hash ^ tags.hash
+    [name, tags].hash
   end
 
   sig { returns(String) }