Merge pull request #3820 from sjackman/macos-version

Define OS::Mac on Linux

.travis.yml

@@ -36,22 +36,13 @@ before_install:
       mv "$HOMEBREW_REPOSITORY/Library/Taps" "$PWD/Library";
       sudo rm -rf "$HOMEBREW_REPOSITORY";
       sudo ln -s "$PWD" "$HOMEBREW_REPOSITORY";
-    else
-      HOMEBREW_CORE_TAP_DIR="$(brew --repo "homebrew/core")";
-      mkdir -p "$HOMEBREW_CORE_TAP_DIR";
     fi
   - if [ "$MACOS" ]; then
       travis_retry git -C Library/Taps/homebrew/homebrew-core fetch --depth=1 origin;
+    else
+      travis_retry git clone --depth=1 https://github.com/Homebrew/homebrew-core Library/Taps/homebrew/homebrew-core;
     fi
   - travis_retry git clone --depth=1 https://github.com/Homebrew/homebrew-test-bot Library/Taps/homebrew/homebrew-test-bot
-  - if [ "$LINUX" ]; then
-      HOMEBREW_TEST_BOT_TAP_DIR="$(brew --repo "homebrew/test-bot")";
-      ln -s "$HOMEBREW_TEST_BOT_TAP_DIR/.git" "$HOMEBREW_TEST_BOT_TAP_DIR/Formula" "$HOMEBREW_CORE_TAP_DIR";
-    fi
-  # can be removed after 1.5.3 is tagged
-  - if [ "$LINUX" ]; then
-      export HOMEBREW_FORCE_VENDOR_RUBY=1;
-    fi
 
 script:
   - brew test-bot

Library/Homebrew/os.rb

@@ -21,6 +21,7 @@ module OS
     end
     PATH_OPEN = "/usr/bin/open".freeze
   elsif OS.linux?
+    require "os/linux"
     ISSUES_URL = "https://github.com/Linuxbrew/brew/wiki/troubleshooting".freeze
     PATH_OPEN = "xdg-open".freeze
   end

Library/Homebrew/os/linux.rb

@@ -0,0 +1,28 @@
+module OS
+  # Define OS::Mac on Linux for formula API compatibility.
+  module Mac
+    module_function
+
+    ::MacOS = self # rubocop:disable Naming/ConstantName
+
+    def prefer_64_bit?
+      Hardware::CPU.is_64_bit?
+    end
+
+    def version
+      Version::NULL
+    end
+
+    def full_version
+      Version::NULL
+    end
+
+    module Xcode
+      module_function
+
+      def version
+        Version::NULL
+      end
+    end
+  end
+end