[Rubyinstaller-devel] Gem compatibility and platform specific dependencies
gthiesfeld at gmail.com
Fri Apr 25 02:02:11 EDT 2008
On Thu, Apr 24, 2008 at 11:21 PM, Luis Lavena <luislavena at gmail.com> wrote:
> On Fri, Apr 25, 2008 at 1:01 AM, Gordon Thiesfeld <gthiesfeld at gmail.com> wrote:
> > This may be better asked on the RubyGems list, but I thought I'd try
> > here first. I'm working on a patch for the github gem. The
> > github command requires open3, which doesn't work on Windows because
> > of fork, so I have it check for platform, and require WIn32-Open3 if
> > on Windows. So, I have two questions about how to go about this.
> > First, is Gem.win_platform? the proper way to go about this. I think
> > it's safe to say this package will always be distributed as a gem, so
> > Gem will always exist when I need it.
> I think is safe to assume Gem.win_platform? is available since you're
> implementing that into a project that get's distributed/installed as
> The only problem is that win_platform? will be 'true' even for cygwin
> implementation, which will render win32/open3 useless and I can smell
> that will crash :-P
Oh yeah, I forgot about cygwin. I guess open3 works on cygwin? Is
this the proper regex, then?
RUBY_PLATFORM =~ /mswin|mingw/
> > Second, is there a way to have Gem depedencies that are platform
> > specific? Open3 is part of the stdlib, so no dependency there, but on
> > Windows we need the Win32 gem. I've borrowed a pattern from RSpec for
> > this:
> To our bad, there isn't a way to do that, you can create a
> "windows-specific" version and in that gem include the dependencies,
> but without a real need to do that, I think workaround in the code
> should be used.
I was hoping I'd missed something simple, like:
add_dependency() if Gem.win_platform?
But if it's not there I'm not going to ask for it. At least not in this case.
> > begin
> > require 'win32 package'
> > rescue LoadError
> > warn "You must 'gem install the win32 package to do this on Windows"
> > exit 1
> > end
> > But in the case of RSpec, it's only used for colored console output.
> > If you don't use that feature, you'll never know you need to have the
> > gem installed. In this case, the whole thing just won't work.
> > That's what dependencies are all about, I'd think. If there isn't
> > such a thing as platform specific dependencies, then what I'm fine
> > doing it this way. I'm just wondering if there's a better way.
> A good workaround will be poke the ruby-core developers to merge
> win32/open3 package in and reduce our code cluttery, but I don't see
> that will happen anytime soon :-P
I don't follow ruby-core that much, has this ever been suggested? I'm
sure it must have at some point.
> > Thanks,
> Thanks to you Gordon!
> BTW: just pushed installer3 into the repository:
Should I switch from bzr to svn, or hold out for the git repo announcement ;-)
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