From: Luis Lavena <luislavena@...>
Date: 2010-08-12T04:40:06+09:00
Subject: Re: Determining whether the running ruby is outdated?

On Aug 11, 4:29 pm, Dan Rathbun <danzoi...@gmail.com> wrote:
> Lars, I found where the information is in each package.
>
> It is in the version.h file (a C source header file.)
>
> In the some of the older precompiled packages, a copy of this file, is
> placed in the #{platform} subdir of the ruby/lib/ruby/#{engine}
> directory.
> In newer precompiled packages, it cannot find it and it may have been
> replaced with rbconfig.rb
>

No, all versions of MRI (Matz Ruby Implementation) still stores
version information in a C header, not Ruby code.

> In the source packages, the file is in the source/#{ver-patchlevel} dir
> of the source archives.
> The problem with them is thay are all in compressed archives (tarballs
> or zips,) so you cannot read them over the net.
>

Yes, the only workaround is download, extract and find the file.

In RubyInstaller we know what we are looking for:

http://github.com/oneclick/rubyinstaller/blob/master/recipes/packager/inno.rake#L3-14
http://github.com/oneclick/rubyinstaller/blob/master/recipes/packager/inno.rake#L116

Do a Dir.glob and look for version.h

--
Luis Lavena