RAILS_GEM_VERSION may be set to any valid gem version specifier. Closes #10057.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@8160 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

3 files changed, 18 insertions, 4 deletions

diff --git a/railties/CHANGELOG b/railties/CHANGELOG
index 86bad736ac..5b3bb07022 100644
--- a/railties/CHANGELOG
+++ b/railties/CHANGELOG
@@ -1,5 +1,7 @@
 *SVN*
 
+* RAILS_GEM_VERSION may be set to any valid gem version specifier.  #10057 [Chad Woolley, Chu Yeow]
+
 * Load config/preinitializer.rb, if present, before loading the environment.  #9943 [Chad Woolley]
 
 * FastCGI handler ignores unsupported signals like USR2 on Windows.  [Grzegorz Derebecki]
diff --git a/railties/environments/boot.rb b/railties/environments/boot.rb
index 518a8883c1..b71c198db3 100644
--- a/railties/environments/boot.rb
+++ b/railties/environments/boot.rb
@@ -55,7 +55,7 @@ module Rails
 
     def load_rails_gem
       if version = self.class.gem_version
-        gem 'rails', "=#{version}"
+        gem 'rails', version
       else
         gem 'rails'
       end
@@ -93,7 +93,7 @@ module Rails
       end
 
       def parse_gem_version(text)
-        $1 if text =~ /^[^#]*RAILS_GEM_VERSION\s*=\s*'([\d.]+)'/
+        $1 if text =~ /^[^#]*RAILS_GEM_VERSION\s*=\s*'([!~<>=]*\s*[\d.]+)'/
       end
 
       private
diff --git a/railties/test/boot_test.rb b/railties/test/boot_test.rb
index 930a0d552a..375ce52e31 100644
--- a/railties/test/boot_test.rb
+++ b/railties/test/boot_test.rb
@@ -96,7 +96,7 @@ class GemBootTest < Test::Unit::TestCase
     GemBoot.stubs(:gem_version).returns('0.0.1')
 
     boot = GemBoot.new
-    boot.expects(:gem).with('rails', '=0.0.1')
+    boot.expects(:gem).with('rails', '0.0.1')
     boot.load_rails_gem
   end
 
@@ -112,7 +112,7 @@ class GemBootTest < Test::Unit::TestCase
     GemBoot.stubs(:gem_version).returns('0.0.1')
 
     boot = GemBoot.new
-    boot.expects(:gem).with('rails', '=0.0.1').raises(Gem::LoadError, 'missing rails 0.0.1 gem')
+    boot.expects(:gem).with('rails', '0.0.1').raises(Gem::LoadError, 'missing rails 0.0.1 gem')
     STDERR.expects(:puts)
     boot.expects(:exit).with(1)
     boot.load_rails_gem
@@ -155,6 +155,18 @@ class ParseGemVersionTest < Test::Unit::TestCase
     assert_equal "1.2.3", parse("RAILS_GEM_VERSION = '1.2.3'\n# RAILS_GEM_VERSION = '9.8.7'")
   end
 
+  def test_should_allow_advanced_rubygems_version_specifications
+    # See http://rubygems.org/read/chapter/16
+    assert_equal "=1.2.3", parse("RAILS_GEM_VERSION = '=1.2.3'") # equal sign
+    assert_equal "= 1.2.3", parse("RAILS_GEM_VERSION = '= 1.2.3'") # with space
+    assert_equal "!=1.2.3", parse("RAILS_GEM_VERSION = '!=1.2.3'") # not equal
+    assert_equal ">1.2.3", parse("RAILS_GEM_VERSION = '>1.2.3'") # greater than
+    assert_equal "<1.2.3", parse("RAILS_GEM_VERSION = '<1.2.3'") # less than
+    assert_equal ">=1.2.3", parse("RAILS_GEM_VERSION = '>=1.2.3'") # greater than or equal
+    assert_equal "<=1.2.3", parse("RAILS_GEM_VERSION = '<=1.2.3'") # less than or equal
+    assert_equal "~>1.2.3.0", parse("RAILS_GEM_VERSION = '~>1.2.3.0'") # approximately greater than
+  end
+
   private
     def parse(text)
       Rails::GemBoot.parse_gem_version(text)