Add guards to calls that would trigger Xcode install requests

add guard in Formula#file_modified? to prevent git popup

add guard in Superenv.bin before calling MacOS::Xcode.version

add guard against missing Xcode/CLT in Xcode.uncached_version

return nil instread of 0 in uncached_version when Xcode/CLT are not present, to distinguish from linuxbrew behavior

checks against pour_bottle? and needs_relocation?, add guard around keg.relocate_install_names to check pour_bottle?/needs_relocation? as well

needs_relocation? becomes skip_relocation?, use cellar attr to indicate relocation instead of does_not_need_relocation

MacOS.can_build? becomes MacOS.has_apple_developer_tools?

Library/Homebrew/cmd/config.rb

@@ -7,23 +7,23 @@ module Homebrew
   end
 
   def llvm
-    @llvm ||= MacOS.llvm_build_version
+    @llvm ||= MacOS.llvm_build_version if MacOS.has_apple_developer_tools?
   end
 
   def gcc_42
-    @gcc_42 ||= MacOS.gcc_42_build_version
+    @gcc_42 ||= MacOS.gcc_42_build_version if MacOS.has_apple_developer_tools?
   end
 
   def gcc_40
-    @gcc_40 ||= MacOS.gcc_40_build_version
+    @gcc_40 ||= MacOS.gcc_40_build_version if MacOS.has_apple_developer_tools?
   end
 
   def clang
-    @clang ||= MacOS.clang_version
+    @clang ||= MacOS.clang_version if MacOS.has_apple_developer_tools?
   end
 
   def clang_build
-    @clang_build ||= MacOS.clang_build_version
+    @clang_build ||= MacOS.clang_build_version if MacOS.has_apple_developer_tools?
   end
 
   def xcode

Library/Homebrew/cmd/install.rb

@@ -40,7 +40,7 @@ module Homebrew
 
       # if the user's flags will prevent bottle only-installations when no
       # developer tools are available, we need to stop them early on
-      FormulaInstaller.prevent_build_flags unless MacOS.can_build?
+      FormulaInstaller.prevent_build_flags unless MacOS.has_apple_developer_tools?
 
       ARGV.formulae.each do |f|
         # head-only without --HEAD is an error
@@ -126,11 +126,6 @@ module Homebrew
   end
 
   def check_xcode
-    # TODO: reinstate check_for_bad_install_name_tool and check_for_installed_developer_tools
-    # currently check_for_bad_install_name_tool fails because it tries to call
-    # the /usr/bin/otool stub program on systems without XCode/CLT
-    # check_for_installed_developer_tools doesn't fail, but produces a warning
-    # when one is no longer required
     checks = Checks.new
     %w[
       check_for_unsupported_osx

Library/Homebrew/cmd/reinstall.rb

@@ -2,7 +2,7 @@ require "formula_installer"
 
 module Homebrew
   def reinstall
-    FormulaInstaller.prevent_build_flags unless MacOS.can_build?
+    FormulaInstaller.prevent_build_flags unless MacOS.has_apple_developer_tools?
 
     ARGV.resolved_formulae.each { |f| reinstall_formula(f) }
   end

Library/Homebrew/cmd/upgrade.rb

@@ -3,7 +3,7 @@ require "cmd/outdated"
 
 module Homebrew
   def upgrade
-    FormulaInstaller.prevent_build_flags unless MacOS.can_build?
+    FormulaInstaller.prevent_build_flags unless MacOS.has_apple_developer_tools?
 
     Homebrew.perform_preinstall_checks
 

Library/Homebrew/extend/ENV/std.rb

@@ -29,7 +29,7 @@ module Stdenv
     self["PKG_CONFIG_LIBDIR"] = determine_pkg_config_libdir
 
     # make any aclocal stuff installed in Homebrew available
-    self["ACLOCAL_PATH"] = "#{HOMEBREW_PREFIX}/share/aclocal" if MacOS::Xcode.provides_autotools?
+    self["ACLOCAL_PATH"] = "#{HOMEBREW_PREFIX}/share/aclocal" if MacOS.has_apple_developer_tools? && MacOS::Xcode.provides_autotools?
 
     self["MAKEFLAGS"] = "-j#{make_jobs}"
 

Library/Homebrew/extend/ENV/super.rb

@@ -23,6 +23,8 @@ module Superenv
   end
 
   def self.bin
+    return unless MacOS.has_apple_developer_tools?
+
     bin = (HOMEBREW_REPOSITORY/"Library/ENV").subdirs.reject { |d| d.basename.to_s > MacOS::Xcode.version }.max
     bin.realpath unless bin.nil?
   end

Library/Homebrew/formula.rb

@@ -720,7 +720,11 @@ class Formula
   end
 
   def file_modified?
-    return false unless which("git")
+    git_dir = MacOS.locate("git").dirname.to_s
+
+    # /usr/bin/git is a popup stub when Xcode/CLT aren't installed, so bail out
+    return false if git_dir == "/usr/bin" && !MacOS.has_apple_developer_tools?
+
     path.parent.cd do
       diff = Utils.popen_read("git", "diff", "origin/master", "--", "#{path}")
       !diff.empty? && $?.exitstatus == 0

Library/Homebrew/formula_installer.rb

@@ -154,7 +154,7 @@ class FormulaInstaller
 
     check_conflicts
 
-    if !pour_bottle? && !MacOS.can_build?
+    if !pour_bottle? && !MacOS.has_apple_developer_tools?
       raise BuildToolsError.new([formula])
     end
 
@@ -182,7 +182,7 @@ class FormulaInstaller
 
     if pour_bottle?(:warn => true)
       begin
-        install_relocation_tools if formula.bottle.needs_relocation?
+        install_relocation_tools unless formula.bottle.skip_relocation?
         pour
       rescue => e
         raise if ARGV.homebrew_developer?
@@ -243,7 +243,7 @@ class FormulaInstaller
   def check_dependencies_bottled(deps)
     unbottled = deps.select do |dep, _|
       formula = dep.to_formula
-      !formula.pour_bottle? && !MacOS.can_build?
+      !formula.pour_bottle? && !MacOS.has_apple_developer_tools?
     end
 
     raise BuildToolsError.new(unbottled) unless unbottled.empty?
@@ -434,9 +434,7 @@ class FormulaInstaller
     keg = Keg.new(formula.prefix)
     link(keg)
 
-    # this needs to be changed to a test against build_bottle? and
+    fix_install_names(keg) unless @poured_bottle && formula.bottle.skip_relocation?
-    # formula.bottle.needs_relocation?
-    fix_install_names(keg) unless formula.name == 'cctools'
 
     if build_bottle? && formula.post_install_defined?
       ohai "Not running post_install as we're building a bottle"
@@ -668,8 +666,10 @@ class FormulaInstaller
     end
 
     keg = Keg.new(formula.prefix)
+    unless formula.bottle.skip_relocation?
       keg.relocate_install_names Keg::PREFIX_PLACEHOLDER, HOMEBREW_PREFIX.to_s,
         Keg::CELLAR_PLACEHOLDER, HOMEBREW_CELLAR.to_s, :keg_only => formula.keg_only?
+    end
 
     Pathname.glob("#{formula.bottle_prefix}/{etc,var}/**/*") do |path|
       path.extend(InstallRenamed)

Library/Homebrew/keg_relocate.rb

@@ -99,7 +99,7 @@ class Keg
 
   def install_name_tool(*args)
     tool = MacOS.install_name_tool
-    system(tool, *args) || raise ErrorDuringExecution.new(tool, args)
+    system(tool, *args) or raise ErrorDuringExecution.new(tool, args)
   end
 
   # If file is a dylib or bundle itself, look for the dylib named by

Library/Homebrew/os/mac.rb

@@ -52,7 +52,7 @@ module OS
       end
     end
 
-    def can_build?
+    def has_apple_developer_tools?
       Xcode.installed? || CLT.installed?
     end
 

Library/Homebrew/os/mac/xcode.rb

@@ -76,6 +76,8 @@ module OS
 
         return "0" unless OS.mac?
 
+        return nil if !MacOS::Xcode.installed? && !MacOS::CLT.installed?
+
         %W[#{prefix}/usr/bin/xcodebuild #{which("xcodebuild")}].uniq.each do |path|
           if File.file? path
             Utils.popen_read(path, "-version") =~ /Xcode (\d(\.\d)*)/

Library/Homebrew/software_spec.rb

@@ -245,8 +245,8 @@ class Bottle
     @spec.compatible_cellar?
   end
 
-  def needs_relocation?
+  def skip_relocation?
-    @spec.needs_relocation?
+    @spec.skip_relocation?
   end
 
   def stage
@@ -274,7 +274,6 @@ class BottleSpecification
     @prefix = DEFAULT_PREFIX
     @cellar = DEFAULT_CELLAR
     @collector = BottleCollector.new
-    @does_not_need_relocation = false
   end
 
   def root_url(var = nil)
@@ -286,15 +285,11 @@ class BottleSpecification
   end
 
   def compatible_cellar?
-    cellar == :any || cellar == HOMEBREW_CELLAR.to_s
+    cellar == :any || cellar == :any_skip_relocation || cellar == HOMEBREW_CELLAR.to_s
   end
 
-  def does_not_need_relocation
+  def skip_relocation?
-    @does_not_need_relocation = true
+    cellar == :any_skip_relocation
-  end
-
-  def needs_relocation?
-    !@does_not_need_relocation
   end
 
   def tag?(tag)