[Rubygems-developers] Enhancement Proposal: Would like be able to programatically specify platform

Chad Fowler chad at chadfowler.com
Wed Nov 29 08:04:17 EST 2006

On 11/28/06, Chad Woolley <thewoolleyman at gmail.com> wrote:
> Hello,
> I'm writing a tool ("geminstaller" on RubyForge) which will
> automatically install all required gem versions for an app/server,
> based on a config file.  This is inspired by the way Maven handles
> dependency auto-download for Java.
> Anyway, it's almost releasable, except for one hitch:  I can't figure
> out how to programatically specify a platform for multiplatform/binary
> gems; I always get prompted with the list of platform/version choices.
> The crux of the problem seems to be in
> Gem::RemoteInstaller.find_gem_to_install.  It appears to be hardcoded
> to prompt the user with a list of all gems if any binary gems exist,
> with no way to programatically specify an exact name + version +
> platform.
> I can hack around this by overriding this method, as well as the
> entire call stack up through InstallCommand, etc.  I'm currently using
> GemRunner as my interface point to invoke RubyGems, because I want to
> avoid digging into the guts of RubyGems as much as possible.
> However, this approach would require me to override several methods
> (at least 4 I've found so far).  I really don't like this, because
> it's asking for forward-compatibility problems when new releases of
> RubyGems are released.
> So, what is your advice?  Am I missing some easy solution to this?  If
> not, would you RubyGem developers be up for accepting a patch which
> adds platform-specifying capability to the current code (including an
> appropriate command line option)?  If so, I'd like to contribute it.
> I'd still have to hack around it for backward compatibility with prior
> RubyGem releases, but it would be nice to know I wouldn't have to
> worry about forward compatibility.  Plus I think it would be a nice
> feature :)
> Thanks,
> Chad
> P.S.  Sorry if this has already been discussed in a prior thread, I
> just joined the group and was too lazy to search the archives.
> _______________________________________________

Hi.  You're right that this is a limitation.  Jim and I discussed it
at length at the recent Rails Edge conference.  We have a solution in
mind, but we haven't started hacking yet.


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