Revert "Simplify dependency setup"

This reverts commit a3fe34e.
This fixes #246

Author: ignisf

.gitignore

@@ -13,3 +13,6 @@ lib/libv8/VERSION
 /release/**/libv8
 /release/**/.vagrant
 /release/**/.scaleway
+/vendor/.gclient
+/vendor/.gclient_entries
+/vendor/v8/

.gitmodules

@@ -1,6 +1,3 @@
 [submodule "vendor/depot_tools"]
 	path = vendor/depot_tools
 	url = https://chromium.googlesource.com/chromium/tools/depot_tools.git
-[submodule "vendor/v8"]
-	path = vendor/v8
-	url = https://chromium.googlesource.com/v8/v8.git

Rakefile

@@ -102,6 +102,7 @@ end
 desc "clean up artifacts of the build"
 task :clean => [:clean_submodules] do
   sh "rm -rf pkg"
+  sh "rm -rf vendor/v8"
   sh "git clean -dxf -e .bundle -e vendor/bundle"
 end
 

ext/libv8/builder.rb

@@ -112,12 +112,19 @@ def source_version
     #
     def setup_build_deps!
       ENV['PATH'] = "#{File.expand_path('../../../vendor/depot_tools', __FILE__)}:#{ENV['PATH']}"
-      Dir.chdir(File.expand_path('../../../vendor/v8', __FILE__)) do
-        unless system "git checkout #{source_version}"
-          fail "unable to checkout source for v8 #{source_version}"
+      Dir.chdir(File.expand_path('../../../vendor', __FILE__)) do
+        unless Dir.exists? 'v8'
+          system "env #{gyp_defines} fetch v8" or fail "unable to fetch v8 source"
+        else
+          system "env #{gyp_defines} gclient fetch" or fail "could not fetch v8 build dependencies commits"
+        end
+        Dir.chdir('v8') do
+          unless system "git checkout #{source_version}"
+            fail "unable to checkout source for v8 #{source_version}"
+          end
+          system "env #{gyp_defines} gclient sync" or fail "could not sync v8 build dependencies"
+          system "git checkout Makefile" # Work around a weird bug on FreeBSD
         end
-        system "env #{gyp_defines} gclient sync -n" or fail "could not sync v8 build dependencies"
-        system "git checkout Makefile" # Work around a weird bug on FreeBSD
       end
     end