Add RPM dependency generators for RubyGems.

ruby.spec

@@ -82,6 +82,10 @@ Source6: abrt_prelude.rb
 # https://fedorahosted.org/fpc/ticket/312
 # https://bugzilla.redhat.com/show_bug.cgi?id=977941
 Source7: config.h
+# RPM dependency generators.
+Source8: rubygems.attr
+Source9: rubygems.req
+Source10: rubygems.prov
 
 
 # Include the constants defined in macros files.
@@ -477,6 +481,12 @@ sed -i "s/%%{name}/%{name}/" %{buildroot}%{_rpmconfigdir}/macros.d/macros.ruby
 install -m 644 %{SOURCE5} %{buildroot}%{_rpmconfigdir}/macros.d/macros.rubygems
 sed -i "s/%%{name}/%{name}/" %{buildroot}%{_rpmconfigdir}/macros.d/macros.rubygems
 
+# Install dependency generators.
+mkdir -p %{buildroot}%{_rpmconfigdir}/fileattrs
+install -m 644 %{SOURCE8} %{buildroot}%{_rpmconfigdir}/fileattrs
+install -m 755 %{SOURCE9} %{buildroot}%{_rpmconfigdir}
+install -m 755 %{SOURCE10} %{buildroot}%{_rpmconfigdir}
+
 # Install custom operating_system.rb.
 mkdir -p %{buildroot}%{rubygems_dir}/rubygems/defaults
 cp %{SOURCE1} %{buildroot}%{rubygems_dir}/rubygems/defaults
@@ -821,6 +831,9 @@ OPENSSL_ENABLE_MD5_VERIFY=1 make check TESTS="-v $DISABLE_TESTS"
 
 %files -n rubygems-devel
 %{_rpmconfigdir}/macros.d/macros.rubygems
+%{_rpmconfigdir}/fileattrs/rubygems.attr
+%{_rpmconfigdir}/rubygems.req
+%{_rpmconfigdir}/rubygems.prov
 
 %files -n rubygem-rake
 %{_bindir}/rake
@@ -890,6 +903,9 @@ OPENSSL_ENABLE_MD5_VERIFY=1 make check TESTS="-v $DISABLE_TESTS"
 %{ruby_libdir}/tkextlib
 
 %changelog
+* Mon Mar 03 2014 Vít Ondruch <vondruch@redhat.com> - 2.1.0-19
+- Add RPM dependency generators for RubyGems.
+
 * Mon Feb 10 2014 Josef Stribny <jstribny@redhat.com> - 2.1.0-19
 - Don't link cert.pem explicitely
 

rubygems.attr

@@ -0,0 +1,3 @@
+%__rubygems_requires	%{_rpmconfigdir}/rubygems.req
+%__rubygems_provides	%{_rpmconfigdir}/rubygems.prov
+%__rubygems_path	^%{gem_spec}$

rubygems.prov

@@ -0,0 +1,36 @@
+#!/usr/bin/ruby
+
+require 'rubygems/package'
+
+module RubyGemsProv
+  module Helpers
+    # If there is some prelease version files, such as rc1 (i.e. non-numeric
+    # field), prepend this field by tilde instead of dot.
+    def self.normalize_prerelease(version)
+      if version.prerelease?
+        prerelease = version.version.sub /^#{version.release}\./, ''
+        "#{version.release}~#{prerelease}"
+      else
+        version.release
+      end
+    end
+  end
+
+  # Reports all functionality gem provides.
+  def self.provides
+    while filename = gets
+      filename.strip!
+      begin
+        specification = Gem::Specification.load filename
+
+        puts "rubygem(#{specification.name}) = #{Helpers::normalize_prerelease(specification.version)}"
+      rescue => e
+        # Ignore all errors.
+      end
+    end
+  end
+end
+
+if __FILE__ == $0
+  RubyGemsProv::provides
+end

rubygems.req

@@ -0,0 +1,81 @@
+#!/usr/bin/ruby
+
+require 'rubygems/package'
+
+module RubyGemsReq
+  module Helpers
+    # Expands '~>' and '!=' gem requirements.
+    def self.expand_requirement(requirements)
+      requirements.inject([]) do |output, r|
+        output.concat case r.first
+        when '~>'
+          expand_pessimistic_requirement(r)
+        when '!='
+          expand_not_equal_requirement(r)
+        else
+          [r]
+        end
+      end
+    end
+
+    # Expands the pessimistic version operator '~>' into equivalent '>=' and
+    # '<' pair.
+    def self.expand_pessimistic_requirement(requirement)
+      next_version = Gem::Version.create(requirement.last).bump
+      return ['>=', requirement.last], ['<', next_version]
+    end
+
+    # Expands the not equal version operator '!=' into equivalent '<' and
+    # '>' pair.
+    def self.expand_not_equal_requirement(requirement)
+      return ['<', requirement.last], ['>', requirement.last]
+    end
+
+    # Converts Gem::Requirement into array of requirements strings compatible
+    # with RPM .spec file.
+    def self.requirement_versions_to_rpm(requirement)
+      self.expand_requirement(requirement.requirements).map do |op, version|
+        version == Gem::Version.new(0) ? "" : "#{op} #{version}"
+      end
+    end
+  end
+
+  # Report RubyGems dependency, versioned if required.
+  def self.rubygems_dependency(specification)
+    Helpers::requirement_versions_to_rpm(specification.required_rubygems_version).each do |requirement|
+      dependency_string = "ruby(rubygems)"
+      dependency_strint += " #{specification.required_rubygems_version}" if requirement && requirement.length > 0
+      puts dependency_string
+    end
+  end
+
+  # Report all gem dependencies including their version.
+  def self.gem_depenencies(specification)
+    specification.runtime_dependencies.each do |dependency|
+      Helpers::requirement_versions_to_rpm(dependency.requirement).each do |requirement|
+        dependency_string = "rubygem(#{dependency.name})"
+        dependency_string += " #{requirement}" if requirement && requirement.length > 0
+        puts dependency_string
+      end
+    end
+  end
+
+  # Reports all requirements specified by all provided .gemspec files.
+  def self.requires
+    while filename = gets
+      filename.strip!
+      begin
+        specification = Gem::Specification.load filename
+
+        rubygems_dependency(specification)
+        gem_depenencies(specification)
+      rescue => e
+        # Ignore all errors.
+      end
+    end
+  end
+end
+
+if __FILE__ == $0
+  RubyGemsReq::requires
+end