From: Charlie Savage <redmine@...>
Date: 2009-03-28T17:34:51+09:00
Subject: [ruby-core:23042] [Bug #1266] relative_path broken on windows

Issue #1266 has been updated by Charlie Savage.

File pathname.patch added

I was hoping we could raise the priority of this issue.  This bug prevents Ruby's test suite from being run at all on windows:

:\Development\src\ruby_trunk\test>ruby runner.rb minitest\test_mini_test.rb
c:/Development/ruby-1.9.1/usr/lib/ruby/1.9.1/pathname.rb:790:in `relative_path_from': different prefix: "c:/" and "C:/Development/src/ruby_trunk/test" (ArgumentError)
        from C:/Development/src/ruby_trunk/test/minitest/test_mini_test.rb:33:in `<class:TestMiniTest>'
        from C:/Development/src/ruby_trunk/test/minitest/test_mini_test.rb:16:in `<top (required)>'
        from c:/Development/ruby-1.9.1/usr/lib/ruby/1.9.1/test/unit.rb:55:in `require'
        from c:/Development/ruby-1.9.1/usr/lib/ruby/1.9.1/test/unit.rb:55:in `block in setup_argv'
        from c:/Development/ruby-1.9.1/usr/lib/ruby/1.9.1/test/unit.rb:49:in `each'
        from c:/Development/ruby-1.9.1/usr/lib/ruby/1.9.1/test/unit.rb:49:in `setup_argv'
        from runner.rb:9:in `<main>'

The issues is that relative path is using case-sensitive comparisons.  That's right on Linux, wrong on Windows.   For whatever reason on Windows __FILE__ returns c:\.. while Dir.pwd returns C:\..   And thus the problem.

I've attahced a proposed patch. If on windows (detecting mswin or mingw) then the comparison uses casecmp instead of ==.  This seems like it would also apply on OS X when having a case-insensitive HFS+ drive.
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http://redmine.ruby-lang.org/issues/show/1266

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