Move SCM wrappers from Contributions to ENV/scm.

Closes Homebrew/homebrew#32615.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

1 files changed, 51 insertions, 0 deletions

diff --git a/Library/ENV/scm/git b/Library/ENV/scm/git
new file mode 100755
index 000000000..888a6ff11
--- /dev/null
+++ b/Library/ENV/scm/git
@@ -0,0 +1,51 @@
+#!/usr/bin/ruby -W0
+# This script because we support $GIT, $HOMEBREW_SVN, etc. and Xcode-only
+# configurations. Order is careful to be what the user would want.
+
+F = File.basename(__FILE__).freeze
+D = File.expand_path(File.dirname(__FILE__)).freeze
+
+def exec *args
+  # prevent fork-bombs
+  arg0 = if args.size == 1
+    args.first.split(' ')
+  else
+    args
+  end.first
+  return if arg0 =~ /^#{F}/i
+  return if File.expand_path(arg0) == File.expand_path(__FILE__)
+
+  if args[1] == '-print-path' and File.executable? args[0]
+    puts args[0]
+    exit 0
+  else
+    Kernel.exec *args
+  end
+end
+
+case F.downcase
+  when 'git' then %W{HOMEBREW_GIT GIT}
+  when 'svn' then %W{HOMEBREW_SVN}
+  else []
+end.each do |key|
+  exec ENV[key], *ARGV if ENV[key] and File.executable? ENV[key]
+end
+
+brew_version = File.expand_path("#{D}/../../../bin/#{F}")
+exec brew_version, *ARGV if File.executable? brew_version
+
+`/usr/bin/which -a #{F} 2>/dev/null`.split("\n").each do |path|
+  exec path, *ARGV
+end
+
+# xcrun hangs if xcode-select is set to "/"
+path = `/usr/bin/xcode-select -print-path 2>/dev/null`.chomp
+if path != "/"
+  path = `/usr/bin/xcrun -find #{F} 2>/dev/null`.chomp
+  exec path, *ARGV if File.executable? path
+end
+
+path = "/Applications/Xcode.app/Contents/Developer/usr/bin/#{F}"
+exec path, *ARGV if File.executable? path
+
+abort "You must: brew install #{F}"