Added a system to enforce git hooks.

This should help maintain commit quality.

rules/githooks.rb

@@ -0,0 +1,70 @@
+# Copyright (C) 2011 Mobile Sorcery AB
+#
+# This program is free software; you can redistribute it and/or modify it under
+# the terms of the GNU General Public License, version 2, as published by
+# the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+# or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+# for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; see the file COPYING.  If not, write to the Free
+# Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+# 02111-1307, USA.
+
+require 'FileUtils'
+require "#{File.dirname(__FILE__)}/util.rb"
+
+# If run at the root level of a Git working copy,
+# this function creates a symbolic link from "githooks" to ".git/hooks"
+# If ".git/hooks" already exists and is not the desired symbolic link,
+# it is renamed to ".git/hooks.bak", unless the backup already exists,
+# in which case an error is raised.
+# This works even on Windows NTFS disks, thanks to the program "Junction".
+
+# This function should be run at the beginning of the root build script,
+# to ensure that every developer has version-controlled git hooks installed.
+def enforceGithooks
+	target = '.git/hooks'
+	source = 'githooks'
+	backup = '.git/hooks.bak'
+	if(!File.exist?('.git'))
+		puts '.git not found.'
+		return
+	end
+	if(dirsAreEqual?(target, source))
+		puts 'Hook directories are equal.'
+		return
+	end
+	if(File.exist?(target))
+		if(File.exist?(backup))
+			error "#{target} is broken and #{backup} already exists."+
+				" Please remove one of the directories."
+		end
+		FileUtils.mv(target, backup, :verbose => true)
+	end
+	if(HOST == :win32)
+		sh "githooks/junction.exe #{target} #{source}"
+	else
+		FileUtils.ln_s(target, source, :verbose => true)
+	end
+end
+
+def nonDotEntries(dir)
+	return Dir.entries(dir).reject do |file| file[0,1] == '.' end
+end
+
+def dirsAreEqual?(a, b)
+	return false if(!File.exist?(a))
+	return false if(!File.exist?(b))
+	af = nonDotEntries(a)
+	bf = nonDotEntries(b)
+	return false if(af != bf)	# compare filenames
+	af.each_with_index do |file, i|
+		return false if(File.mtime(a+'/'+file) != File.mtime(b+'/'+bf[i]))
+	end
+	# We could check the contents of the files, but I think that's overkill.
+	return true
+end

workfile.rb

@@ -1,11 +1,14 @@
 #!/usr/bin/ruby
 
 # File.expand_path is used here to ensure the files are really only loaded once.
+require File.expand_path('rules/githooks.rb')
 require File.expand_path('rules/targets.rb')
 require File.expand_path('rules/host.rb')
 require File.expand_path('rules/task.rb')
 require File.expand_path('rules/mosync_util.rb')
 
+enforceGithooks
+
 PRE_DIRS = ["intlibs/idl-common", "intlibs/filelist"]
 
 if(HOST == :win32) then