Question

I am trying to hack through a forked gem (buildr). As such I cloned it from github and began to butcher the code. The official gem is installed on my system (under /usr/lib/ruby.../gems/buildr...). There is an executable which I need to use in my dev process - buildr.

Now I want the buildr executable and the library to point to my forked repo and not the default gem installation. This would be for this gem only. As such, the changes I make against the forked repo is usable directly for testing and so forth.

I would guess I need to load my library prior to the system gem loading. Can somebody recommend the best way to do so?

Answer 1

I did something similar for work when the Spreadsheet gem broke backward compatibility. I put the previous versions code in it s own module and just renamed the gem my-spreadsheet and installed that (I really wanted some of the features of the new gem but I also didn t want to rewrite all my previous code at that point).

If it s just a binary you want to override you could always do some PATH magic, setting the directory of your binary first and thus make sure you always override. But personally I d prefer making my own copy with a new name and installing that.

Answer 2

you could bump the version in the gemspec for your fork. Then when you install your version of the gem, it will use your (newer) version by default.

change buildr.gemspec

#...
  spec.version        =  1.3.4.dev 
#...

Then

$ gem build buildr.gemspec
$ sudo gem install buildr-1.3.4.dev.gem

and it should work.

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