Rich Megginson (richmegginson) wrote,
Rich Megginson
richmegginson

How to find build-time vs. run-time dependencies of a gem

Using ruby 2.2.5p319 (2016-04-26 revision 54774) [x86_64-linux]
gem2rpm 0.11.3
gem 2.4.8

I'm trying to convert gems to rpms. Unfortunately, gem2rpm -d does not separate/classify the dependencies. What I really need is a separate list of run-time dependencies. I can get this with gem spec --ruby. For example:
$ gem spec --ruby systemd-journal-1.2.2.gem
# -*- encoding: utf-8 -*-
# stub: systemd-journal 1.2.2 ruby lib

Gem::Specification.new do |s|
  s.name = "systemd-journal"
  s.version = "1.2.2"
...
  if s.respond_to? :specification_version then
    s.specification_version = 4

    if Gem::Version.new(Gem::VERSION) >= Gem::Version.new('1.2.0') then
      s.add_runtime_dependency(%q<ffi>, ["~> 1.9.0"])
      s.add_development_dependency(%q<rspec>, ["~> 3.1"])
      s.add_development_dependency(%q<simplecov>, ["~> 0.9"])
      s.add_development_dependency(%q<rubocop>, ["~> 0.26"])
      s.add_development_dependency(%q<rake>, ["~> 10.3"])
      s.add_development_dependency(%q<yard>, ["~> 0.8.7"])
      s.add_development_dependency(%q<pry>, ["~> 0.10"])
    else

So I need to add Requires: rubygem(ffi) to the spec.
Tags: gem, rpm, ruby
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