ENV: move to new paths. (Homebrew#507)

Move some stuff formerly in `Library/ENV` around:
- Move `Library/ENV/$XCODE_VERSION` to `Library/Homebrew/env/super` as they are
  all superenv wrappers and all symlinks to the same version. We never needed
  the "separate shims for separate versions" functionality and it just adds
  confusion.
- Move `Library/ENV/pkgconfig` to `Library/Homebrew/env/pkgconfig` to get more
  things under `Library/Homebrew`
- Move `Library/ENV/scm` to `Library/scm` as these wrappers are not actually
  used by or related to superenv (or stdenv) in any way.

Library/Homebrew/cmd/update.sh

@@ -14,7 +14,7 @@ source "$HOMEBREW_LIBRARY/Homebrew/utils/lock.sh"
 git() {
   if [[ -z "$GIT_EXECUTABLE" ]]
   then
-    GIT_EXECUTABLE="$("$HOMEBREW_LIBRARY/ENV/scm/git" --homebrew=print-path)"
+    GIT_EXECUTABLE="$("$HOMEBREW_LIBRARY/Homebrew/scm/git" --homebrew=print-path)"
   fi
   "$GIT_EXECUTABLE" "$@"
 }

Library/Homebrew/config.rb

@@ -14,8 +14,8 @@
 # Where we store most of Homebrew, taps, and various metadata
 HOMEBREW_LIBRARY = Pathname.new(ENV["HOMEBREW_LIBRARY"])
 
-# Where wrapper scripts for Git, Subversion, and various build tools are stored
-HOMEBREW_ENV_PATH = HOMEBREW_LIBRARY/"ENV"
+# Where shim scripts for various build and SCM tools are stored
+HOMEBREW_SHIMS_PATH = HOMEBREW_LIBRARY/"Homebrew/shims"
 
 # Where we store lock files
 HOMEBREW_LOCK_DIR = HOMEBREW_LIBRARY/"Locks"

Library/Homebrew/extend/os/mac/extend/ENV/std.rb

@@ -31,7 +31,7 @@ def setup_build_environment(formula = nil)
   end
 
   def homebrew_extra_pkg_config_paths
-    ["#{HOMEBREW_ENV_PATH}/pkgconfig/#{MacOS.version}"]
+    ["#{HOMEBREW_LIBRARY_PATH}/Homebrew/os/mac/pkgconfig/#{MacOS.version}"]
   end
 
   # Sets architecture-specific flags for every environment variable

Library/Homebrew/extend/os/mac/extend/ENV/super.rb

@@ -3,8 +3,7 @@ module Superenv
   def self.bin
     return unless DevelopmentTools.installed?
 
-    bin = HOMEBREW_ENV_PATH.subdirs.reject { |d| d.basename.to_s > MacOS::Xcode.version }.max
-    bin.realpath unless bin.nil?
+    (HOMEBREW_SHIMS_PATH/"super").realpath
   end
 
   def effective_sysroot
@@ -26,7 +25,8 @@ def homebrew_extra_paths
 
   # @private
   def homebrew_extra_pkg_config_paths
-    paths = ["#{HOMEBREW_ENV_PATH}/pkgconfig/#{MacOS.version}"]
+    paths = \
+      ["#{HOMEBREW_LIBRARY_PATH}/Homebrew/os/mac/pkgconfig/#{MacOS.version}"]
     paths << "#{MacOS::X11.lib}/pkgconfig" << "#{MacOS::X11.share}/pkgconfig" if x11?
     paths
   end

Library/ENV/scm/git → Library/Homebrew/shims/scm/git

@@ -65,8 +65,8 @@ safe_exec() {
 }
 
 SCM_FILE="${0##*/}"
-SCM_DIR="$(quiet_safe_cd "${0%/*}/" && pwd -P)"
 SCM_REAL="$(realpath "$0")"
+SCM_DIR="$(quiet_safe_cd "${SCM_REAL%/*}/" && pwd -P)"
 
 if [[ "$1" = --homebrew=* ]]
 then
@@ -84,7 +84,7 @@ case "$(lowercase "$SCM_FILE")" in
     ;;
 esac
 
-brew_version="$(quiet_safe_cd "$SCM_DIR/../../../bin" && pwd -P)/$SCM_FILE"
+brew_version="$(quiet_safe_cd "$SCM_DIR/../../../../bin" && pwd -P)/$SCM_FILE"
 safe_exec "$brew_version" "$@"
 
 IFS=$'\n'

Library/Homebrew/test/lib/config.rb

@@ -12,7 +12,7 @@
 
 # Paths pointing into the Homebrew code base that persist across test runs
 HOMEBREW_LIBRARY_PATH  = Pathname.new(File.expand_path("../../..", __FILE__))
-HOMEBREW_ENV_PATH      = HOMEBREW_LIBRARY_PATH.parent+"ENV"
+HOMEBREW_SHIMS_PATH    = HOMEBREW_LIBRARY_PATH.parent+"Homebrew/shims"
 HOMEBREW_LOAD_PATH     = [File.expand_path("..", __FILE__), HOMEBREW_LIBRARY_PATH].join(":")
 
 # Paths redirected to a temporary directory and wiped at the end of the test run

Library/Homebrew/utils/git.rb

@@ -1,20 +1,20 @@
 module Utils
   def self.git_available?
     return @git if instance_variable_defined?(:@git)
-    @git = quiet_system HOMEBREW_ENV_PATH/"scm/git", "--version"
+    @git = quiet_system HOMEBREW_SHIMS_PATH/"scm/git", "--version"
   end
 
   def self.git_path
     return unless git_available?
     @git_path ||= Utils.popen_read(
-      HOMEBREW_ENV_PATH/"scm/git", "--homebrew=print-path"
+      HOMEBREW_SHIMS_PATH/"scm/git", "--homebrew=print-path"
     ).chuzzle
   end
 
   def self.git_version
     return unless git_available?
     @git_version ||= Utils.popen_read(
-      HOMEBREW_ENV_PATH/"scm/git", "--version"
+      HOMEBREW_SHIMS_PATH/"scm/git", "--version"
     ).chomp[/git version (\d+(?:\.\d+)*)/, 1]
   end
 

Library/brew.rb

@@ -55,7 +55,7 @@ def require?(path)
   end
 
   # Add SCM wrappers.
-  ENV["PATH"] += "#{File::PATH_SEPARATOR}#{HOMEBREW_ENV_PATH}/scm"
+  ENV["PATH"] += "#{File::PATH_SEPARATOR}#{HOMEBREW_SHIMS_PATH}/scm"
 
   if cmd
     internal_cmd = require? HOMEBREW_LIBRARY_PATH.join("cmd", cmd)

Library/brew.sh

@@ -29,7 +29,7 @@ brew() {
 }
 
 git() {
-  "$HOMEBREW_LIBRARY/ENV/scm/git" "$@"
+  "$HOMEBREW_LIBRARY/Homebrew/shims/scm/git" "$@"
 }
 
 # Force UTF-8 to avoid encoding issues for users with broken locale settings.