gnu: ruby-2.4.3: Update rubygems to 2.7.6.

This fixes the security issues described at
https://www.ruby-lang.org/en/news/2018/02/17/multiple-vulnerabilities-in-
rubygems/

* gnu/packages/patches/ruby-rubygems-276-for-ruby24.patch: New file.
* gnu/packages/ruby.scm (ruby-2.4.3)[source]: Use it.
* gnu/local.mk (dist_patch_DATA): Add it.

2 files changed, 606 insertions, 0 deletions

diff --git a/gnu/packages/patches/ruby-rubygems-276-for-ruby24.patch b/gnu/packages/patches/ruby-rubygems-276-for-ruby24.patch
new file mode 100644
index 0000000000..0d0ed6b204
--- /dev/null
+++ b/gnu/packages/patches/ruby-rubygems-276-for-ruby24.patch
@@ -0,0 +1,605 @@
+diff --git lib/rubygems.rb lib/rubygems.rb
+index 0685bcb3c6..a5a9202e56 100644
+--- ruby-2.4.3/lib/rubygems.rb
++++ ruby-2.4.3/lib/rubygems.rb
+@@ -10,7 +10,7 @@
+ require 'thread'
+ 
+ module Gem
+-  VERSION = "2.6.14"
++  VERSION = "2.6.14.1"
+ end
+ 
+ # Must be first since it unloads the prelude from 1.9.2
+diff --git lib/rubygems/commands/owner_command.rb lib/rubygems/commands/owner_command.rb
+index 4b99434e87..2ee7f84462 100644
+--- ruby-2.4.3/lib/rubygems/commands/owner_command.rb
++++ ruby-2.4.3/lib/rubygems/commands/owner_command.rb
+@@ -62,7 +62,7 @@ def show_owners name
+     end
+ 
+     with_response response do |resp|
+-      owners = YAML.load resp.body
++      owners = Gem::SafeYAML.load resp.body
+ 
+       say "Owners for gem: #{name}"
+       owners.each do |owner|
+diff --git lib/rubygems/package.rb lib/rubygems/package.rb
+index 77811ed5ec..b5a5fe2a26 100644
+--- ruby-2.4.3/lib/rubygems/package.rb
++++ ruby-2.4.3/lib/rubygems/package.rb
+@@ -378,7 +378,7 @@ def extract_tar_gz io, destination_dir, pattern = "*" # :nodoc:
+             File.dirname destination
+           end
+ 
+-        FileUtils.mkdir_p mkdir, mkdir_options
++        mkdir_p_safe mkdir, mkdir_options, destination_dir, entry.full_name
+ 
+         open destination, 'wb' do |out|
+           out.write entry.read
+@@ -416,20 +416,35 @@ def install_location filename, destination_dir # :nodoc:
+     raise Gem::Package::PathError.new(filename, destination_dir) if
+       filename.start_with? '/'
+ 
+-    destination_dir = File.realpath destination_dir if
+-      File.respond_to? :realpath
++    destination_dir = realpath destination_dir
+     destination_dir = File.expand_path destination_dir
+ 
+     destination = File.join destination_dir, filename
+     destination = File.expand_path destination
+ 
+     raise Gem::Package::PathError.new(destination, destination_dir) unless
+-      destination.start_with? destination_dir
++      destination.start_with? destination_dir + '/'
+ 
+     destination.untaint
+     destination
+   end
+ 
++  def mkdir_p_safe mkdir, mkdir_options, destination_dir, file_name
++    destination_dir = realpath File.expand_path(destination_dir)
++    parts = mkdir.split(File::SEPARATOR)
++    parts.reduce do |path, basename|
++      path = realpath path  unless path == ""
++      path = File.expand_path(path + File::SEPARATOR + basename)
++      lstat = File.lstat path rescue nil
++      if !lstat || !lstat.directory?
++        unless path.start_with? destination_dir and (FileUtils.mkdir path, mkdir_options rescue false)
++          raise Gem::Package::PathError.new(file_name, destination_dir)
++        end
++      end
++      path
++    end
++  end
++
+   ##
+   # Loads a Gem::Specification from the TarEntry +entry+
+ 
+@@ -603,6 +618,10 @@ def verify_files gem
+       raise Gem::Package::FormatError.new \
+               'package content (data.tar.gz) is missing', @gem
+     end
++
++    if duplicates = @files.group_by {|f| f }.select {|k,v| v.size > 1 }.map(&:first) and duplicates.any?
++      raise Gem::Security::Exception, "duplicate files in the package: (#{duplicates.map(&:inspect).join(', ')})"
++    end
+   end
+ 
+   ##
+@@ -616,6 +635,16 @@ def verify_gz entry # :nodoc:
+     raise Gem::Package::FormatError.new(e.message, entry.full_name)
+   end
+ 
++  if File.respond_to? :realpath
++    def realpath file
++      File.realpath file
++    end
++  else
++    def realpath file
++      file
++    end
++  end
++
+ end
+ 
+ require 'rubygems/package/digest_io'
+diff --git lib/rubygems/package/tar_header.rb lib/rubygems/package/tar_header.rb
+index c54bd14d57..d557357114 100644
+--- ruby-2.4.3/lib/rubygems/package/tar_header.rb
++++ ruby-2.4.3/lib/rubygems/package/tar_header.rb
+@@ -104,25 +104,30 @@ def self.from(stream)
+     fields = header.unpack UNPACK_FORMAT
+ 
+     new :name     => fields.shift,
+-        :mode     => fields.shift.oct,
+-        :uid      => fields.shift.oct,
+-        :gid      => fields.shift.oct,
+-        :size     => fields.shift.oct,
+-        :mtime    => fields.shift.oct,
+-        :checksum => fields.shift.oct,
++        :mode     => strict_oct(fields.shift),
++        :uid      => strict_oct(fields.shift),
++        :gid      => strict_oct(fields.shift),
++        :size     => strict_oct(fields.shift),
++        :mtime    => strict_oct(fields.shift),
++        :checksum => strict_oct(fields.shift),
+         :typeflag => fields.shift,
+         :linkname => fields.shift,
+         :magic    => fields.shift,
+-        :version  => fields.shift.oct,
++        :version  => strict_oct(fields.shift),
+         :uname    => fields.shift,
+         :gname    => fields.shift,
+-        :devmajor => fields.shift.oct,
+-        :devminor => fields.shift.oct,
++        :devmajor => strict_oct(fields.shift),
++        :devminor => strict_oct(fields.shift),
+         :prefix   => fields.shift,
+ 
+         :empty => empty
+   end
+ 
++  def self.strict_oct(str)
++    return str.oct if str =~ /\A[0-7]*\z/
++    raise ArgumentError, "#{str.inspect} is not an octal string"
++  end
++
+   ##
+   # Creates a new TarHeader using +vals+
+ 
+diff --git lib/rubygems/package/tar_writer.rb lib/rubygems/package/tar_writer.rb
+index f68b8d4c5e..390f7851a3 100644
+--- ruby-2.4.3/lib/rubygems/package/tar_writer.rb
++++ ruby-2.4.3/lib/rubygems/package/tar_writer.rb
+@@ -196,6 +196,8 @@ def add_file_signed name, mode, signer
+       digest_name == signer.digest_name
+     end
+ 
++    raise "no #{signer.digest_name} in #{digests.values.compact}" unless signature_digest
++
+     if signer.key then
+       signature = signer.sign signature_digest.digest
+ 
+diff --git lib/rubygems/server.rb lib/rubygems/server.rb
+index df4eb566d3..a7b5243ba0 100644
+--- ruby-2.4.3/lib/rubygems/server.rb
++++ ruby-2.4.3/lib/rubygems/server.rb
+@@ -631,6 +631,18 @@ def root(req, res)
+       executables = nil if executables.empty?
+       executables.last["is_last"] = true if executables
+ 
++      # Pre-process spec homepage for safety reasons
++      begin
++        homepage_uri = URI.parse(spec.homepage)
++        if [URI::HTTP, URI::HTTPS].member? homepage_uri.class
++          homepage_uri = spec.homepage
++        else
++          homepage_uri = "."
++        end
++      rescue URI::InvalidURIError
++        homepage_uri = "."
++      end
++
+       specs << {
+         "authors"             => spec.authors.sort.join(", "),
+         "date"                => spec.date.to_s,
+@@ -640,7 +652,7 @@ def root(req, res)
+         "only_one_executable" => (executables && executables.size == 1),
+         "full_name"           => spec.full_name,
+         "has_deps"            => !deps.empty?,
+-        "homepage"            => spec.homepage,
++        "homepage"            => homepage_uri,
+         "name"                => spec.name,
+         "rdoc_installed"      => Gem::RDoc.new(spec).rdoc_installed?,
+         "ri_installed"        => Gem::RDoc.new(spec).ri_installed?,
+diff --git lib/rubygems/specification.rb lib/rubygems/specification.rb
+index 40e3a70d47..0a154b9001 100644
+--- ruby-2.4.3/lib/rubygems/specification.rb
++++ ruby-2.4.3/lib/rubygems/specification.rb
+@@ -15,6 +15,7 @@
+ require 'rubygems/stub_specification'
+ require 'rubygems/util/list'
+ require 'stringio'
++require 'uri'
+ 
+ ##
+ # The Specification class contains the information for a Gem.  Typically
+@@ -2813,10 +2814,16 @@ def validate packaging = true
+       raise Gem::InvalidSpecificationException, "#{lazy} is not a summary"
+     end
+ 
+-    if homepage and not homepage.empty? and
+-       homepage !~ /\A[a-z][a-z\d+.-]*:/i then
+-      raise Gem::InvalidSpecificationException,
+-            "\"#{homepage}\" is not a URI"
++    # Make sure a homepage is valid HTTP/HTTPS URI
++    if homepage and not homepage.empty?
++      begin
++        homepage_uri = URI.parse(homepage)
++        unless [URI::HTTP, URI::HTTPS].member? homepage_uri.class
++          raise Gem::InvalidSpecificationException, "\"#{homepage}\" is not a valid HTTP URI"
++        end
++      rescue URI::InvalidURIError
++        raise Gem::InvalidSpecificationException, "\"#{homepage}\" is not a valid HTTP URI"
++      end
+     end
+ 
+     # Warnings
+diff --git test/rubygems/test_gem_commands_owner_command.rb test/rubygems/test_gem_commands_owner_command.rb
+index 44652c1093..53cac4ce87 100644
+--- ruby-2.4.3/test/rubygems/test_gem_commands_owner_command.rb
++++ ruby-2.4.3/test/rubygems/test_gem_commands_owner_command.rb
+@@ -43,6 +43,31 @@ def test_show_owners
+     assert_match %r{- 4}, @ui.output
+   end
+ 
++  def test_show_owners_dont_load_objects
++    skip "testing a psych-only API" unless defined?(::Psych::DisallowedClass)
++
++    response = <<EOF
++---
++- email: !ruby/object:Object {}
++  id: 1
++  handle: user1
++- email: user2@example.com
++- id: 3
++  handle: user3
++- id: 4
++EOF
++
++    @fetcher.data["#{Gem.host}/api/v1/gems/freewill/owners.yaml"] = [response, 200, 'OK']
++
++    assert_raises Psych::DisallowedClass do
++      use_ui @ui do
++        @cmd.show_owners("freewill")
++      end
++    end
++
++  end
++
++
+   def test_show_owners_setting_up_host_through_env_var
+     response = "- email: user1@example.com\n"
+     host = "http://rubygems.example"
+diff --git test/rubygems/test_gem_package.rb test/rubygems/test_gem_package.rb
+index 9d47f0dea4..5b93475314 100644
+--- ruby-2.4.3/test/rubygems/test_gem_package.rb
++++ ruby-2.4.3/test/rubygems/test_gem_package.rb
+@@ -455,6 +455,31 @@ def test_extract_tar_gz_symlink_relative_path
+                  File.read(extracted)
+   end
+ 
++  def test_extract_symlink_parent
++   skip 'symlink not supported' if Gem.win_platform?
++
++   package = Gem::Package.new @gem
++
++   tgz_io = util_tar_gz do |tar|
++     tar.mkdir       'lib',               0755
++     tar.add_symlink 'lib/link', '../..', 0644
++     tar.add_file    'lib/link/outside.txt', 0644 do |io| io.write 'hi' end
++   end
++
++   # Extract into a subdirectory of @destination; if this test fails it writes
++   # a file outside destination_subdir, but we want the file to remain inside
++   # @destination so it will be cleaned up.
++   destination_subdir = File.join @destination, 'subdir'
++   FileUtils.mkdir_p destination_subdir
++
++   e = assert_raises Gem::Package::PathError do
++     package.extract_tar_gz tgz_io, destination_subdir
++   end
++
++   assert_equal("installing into parent path lib/link/outside.txt of " +
++                 "#{destination_subdir} is not allowed", e.message)
++  end
++
+   def test_extract_tar_gz_directory
+     package = Gem::Package.new @gem
+ 
+@@ -566,6 +591,21 @@ def test_install_location_relative
+                  "#{@destination} is not allowed", e.message)
+   end
+ 
++  def test_install_location_suffix
++    package = Gem::Package.new @gem
++
++    filename = "../#{File.basename(@destination)}suffix.rb"
++
++    e = assert_raises Gem::Package::PathError do
++      package.install_location filename, @destination
++    end
++
++    parent = File.expand_path File.join @destination, filename
++
++    assert_equal("installing into parent path #{parent} of " +
++                 "#{@destination} is not allowed", e.message)
++  end
++
+   def test_load_spec
+     entry = StringIO.new Gem.gzip @spec.to_yaml
+     def entry.full_name() 'metadata.gz' end
+@@ -723,6 +763,32 @@ def test_verify_nonexistent
+     assert_match %r%nonexistent.gem$%,           e.message
+   end
+ 
++  def test_verify_duplicate_file
++    FileUtils.mkdir_p 'lib'
++    FileUtils.touch 'lib/code.rb'
++
++    build = Gem::Package.new @gem
++    build.spec = @spec
++    build.setup_signer
++    open @gem, 'wb' do |gem_io|
++      Gem::Package::TarWriter.new gem_io do |gem|
++        build.add_metadata gem
++        build.add_contents gem
++
++        gem.add_file_simple 'a.sig', 0444, 0
++        gem.add_file_simple 'a.sig', 0444, 0
++      end
++    end
++
++    package = Gem::Package.new @gem
++
++    e = assert_raises Gem::Security::Exception do
++      package.verify
++    end
++
++    assert_equal 'duplicate files in the package: ("a.sig")', e.message
++  end
++
+   def test_verify_security_policy
+     skip 'openssl is missing' unless defined?(OpenSSL::SSL)
+ 
+@@ -780,7 +846,13 @@ def test_verify_security_policy_checksum_missing
+ 
+         # write bogus data.tar.gz to foil signature
+         bogus_data = Gem.gzip 'hello'
+-        gem.add_file_simple 'data.tar.gz', 0444, bogus_data.length do |io|
++        fake_signer = Class.new do
++          def digest_name; 'SHA512'; end
++          def digest_algorithm; Digest(:SHA512); end
++          def key; 'key'; end
++          def sign(*); 'fake_sig'; end
++        end
++        gem.add_file_signed 'data2.tar.gz', 0444, fake_signer.new do |io|
+           io.write bogus_data
+         end
+ 
+diff --git test/rubygems/test_gem_package_tar_header.rb test/rubygems/test_gem_package_tar_header.rb
+index d33877057d..43f508df45 100644
+--- ruby-2.4.3/test/rubygems/test_gem_package_tar_header.rb
++++ ruby-2.4.3/test/rubygems/test_gem_package_tar_header.rb
+@@ -143,5 +143,26 @@ def test_update_checksum
+     assert_equal '012467', @tar_header.checksum
+   end
+ 
++  def test_from_bad_octal
++    test_cases = [
++      "00000006,44\000", # bogus character
++      "00000006789\000", # non-octal digit
++      "+0000001234\000", # positive sign
++      "-0000001000\000", # negative sign
++      "0x000123abc\000", # radix prefix
++    ]
++
++    test_cases.each do |val|
++      header_s = @tar_header.to_s
++      # overwrite the size field
++      header_s[124, 12] = val
++      io = TempIO.new header_s
++      assert_raises ArgumentError do
++        new_header = Gem::Package::TarHeader.from io
++      end
++      io.close! if io.respond_to? :close!
++    end
++  end
++
+ end
+ 
+diff --git test/rubygems/test_gem_server.rb test/rubygems/test_gem_server.rb
+index 4873fac5b6..96ed9194e9 100644
+--- ruby-2.4.3/test/rubygems/test_gem_server.rb
++++ ruby-2.4.3/test/rubygems/test_gem_server.rb
+@@ -336,6 +336,171 @@ def test_root_gemdirs
+     assert_match 'z 9', @res.body
+   end
+ 
++
++  def test_xss_homepage_fix_289313
++    data = StringIO.new "GET / HTTP/1.0\r\n\r\n"
++    dir = "#{@gemhome}2"
++
++    spec = util_spec 'xsshomepagegem', 1
++    spec.homepage = "javascript:confirm(document.domain)"
++
++    specs_dir = File.join dir, 'specifications'
++    FileUtils.mkdir_p specs_dir
++
++    open File.join(specs_dir, spec.spec_name), 'w' do |io|
++      io.write spec.to_ruby
++    end
++
++    server = Gem::Server.new dir, process_based_port, false
++
++    @req.parse data
++
++    server.root @req, @res
++
++    assert_equal 200, @res.status
++    assert_match 'xsshomepagegem 1', @res.body
++
++    # This verifies that the homepage for this spec is not displayed and is set to ".", because it's not a 
++    # valid HTTP/HTTPS URL and could be unsafe in an HTML context.  We would prefer to throw an exception here,
++    # but spec.homepage is currently free form and not currently required to be a URL, this behavior may be 
++    # validated in future versions of Gem::Specification.
++    #
++    # There are two variant we're checking here, one where rdoc is not present, and one where rdoc is present in the same regex:
++    #
++    # Variant #1 - rdoc not installed
++    #
++    #   <b>xsshomepagegem 1</b>
++    #
++    #
++    #  <span title="rdoc not installed">[rdoc]</span>
++    #
++    #
++    #
++    #  <a href="." title=".">[www]</a>
++    #
++    # Variant #2 - rdoc installed
++    #
++    #   <b>xsshomepagegem 1</b>
++    #
++    #
++    #  <a href="\/doc_root\/xsshomepagegem-1\/">\[rdoc\]<\/a>
++    #
++    #
++    #
++    #  <a href="." title=".">[www]</a>
++    regex_match = /xsshomepagegem 1<\/b>[\n\s]+(<span title="rdoc not installed">\[rdoc\]<\/span>|<a href="\/doc_root\/xsshomepagegem-1\/">\[rdoc\]<\/a>)[\n\s]+<a href="\." title="\.">\[www\]<\/a>/
++    assert_match regex_match, @res.body
++  end
++
++  def test_invalid_homepage
++    data = StringIO.new "GET / HTTP/1.0\r\n\r\n"
++    dir = "#{@gemhome}2"
++
++    spec = util_spec 'invalidhomepagegem', 1
++    spec.homepage = "notavalidhomepageurl"
++
++    specs_dir = File.join dir, 'specifications'
++    FileUtils.mkdir_p specs_dir
++
++    open File.join(specs_dir, spec.spec_name), 'w' do |io|
++      io.write spec.to_ruby
++    end
++
++    server = Gem::Server.new dir, process_based_port, false
++
++    @req.parse data
++
++    server.root @req, @res
++
++    assert_equal 200, @res.status
++    assert_match 'invalidhomepagegem 1', @res.body
++
++    # This verifies that the homepage for this spec is not displayed and is set to ".", because it's not a 
++    # valid HTTP/HTTPS URL and could be unsafe in an HTML context.  We would prefer to throw an exception here,
++    # but spec.homepage is currently free form and not currently required to be a URL, this behavior may be 
++    # validated in future versions of Gem::Specification.
++    #
++    # There are two variant we're checking here, one where rdoc is not present, and one where rdoc is present in the same regex:
++    #
++    # Variant #1 - rdoc not installed
++    #
++    #   <b>invalidhomepagegem 1</b>
++    #
++    #
++    #  <span title="rdoc not installed">[rdoc]</span>
++    #
++    #
++    #
++    #  <a href="." title=".">[www]</a>
++    #
++    # Variant #2 - rdoc installed
++    #
++    #   <b>invalidhomepagegem 1</b>
++    #
++    #
++    #  <a href="\/doc_root\/invalidhomepagegem-1\/">\[rdoc\]<\/a>
++    #
++    #
++    #
++    #  <a href="." title=".">[www]</a>
++    regex_match = /invalidhomepagegem 1<\/b>[\n\s]+(<span title="rdoc not installed">\[rdoc\]<\/span>|<a href="\/doc_root\/invalidhomepagegem-1\/">\[rdoc\]<\/a>)[\n\s]+<a href="\." title="\.">\[www\]<\/a>/
++    assert_match regex_match, @res.body
++  end
++
++  def test_valid_homepage_http
++    data = StringIO.new "GET / HTTP/1.0\r\n\r\n"
++    dir = "#{@gemhome}2"
++
++    spec = util_spec 'validhomepagegemhttp', 1
++    spec.homepage = "http://rubygems.org"
++
++    specs_dir = File.join dir, 'specifications'
++    FileUtils.mkdir_p specs_dir
++
++    open File.join(specs_dir, spec.spec_name), 'w' do |io|
++      io.write spec.to_ruby
++    end
++
++    server = Gem::Server.new dir, process_based_port, false
++
++    @req.parse data
++
++    server.root @req, @res
++
++    assert_equal 200, @res.status
++    assert_match 'validhomepagegemhttp 1', @res.body
++
++    regex_match = /validhomepagegemhttp 1<\/b>[\n\s]+(<span title="rdoc not installed">\[rdoc\]<\/span>|<a href="\/doc_root\/validhomepagegemhttp-1\/">\[rdoc\]<\/a>)[\n\s]+<a href="http:\/\/rubygems\.org" title="http:\/\/rubygems\.org">\[www\]<\/a>/
++    assert_match regex_match, @res.body
++  end
++
++  def test_valid_homepage_https
++    data = StringIO.new "GET / HTTP/1.0\r\n\r\n"
++    dir = "#{@gemhome}2"
++
++    spec = util_spec 'validhomepagegemhttps', 1
++    spec.homepage = "https://rubygems.org"
++
++    specs_dir = File.join dir, 'specifications'
++    FileUtils.mkdir_p specs_dir
++
++    open File.join(specs_dir, spec.spec_name), 'w' do |io|
++      io.write spec.to_ruby
++    end
++
++    server = Gem::Server.new dir, process_based_port, false
++
++    @req.parse data
++
++    server.root @req, @res
++
++    assert_equal 200, @res.status
++    assert_match 'validhomepagegemhttps 1', @res.body
++
++    regex_match = /validhomepagegemhttps 1<\/b>[\n\s]+(<span title="rdoc not installed">\[rdoc\]<\/span>|<a href="\/doc_root\/validhomepagegemhttps-1\/">\[rdoc\]<\/a>)[\n\s]+<a href="https:\/\/rubygems\.org" title="https:\/\/rubygems\.org">\[www\]<\/a>/
++    assert_match regex_match, @res.body
++  end
++
+   def test_specs
+     data = StringIO.new "GET /specs.#{Gem.marshal_version} HTTP/1.0\r\n\r\n"
+     @req.parse data
+diff --git test/rubygems/test_gem_specification.rb test/rubygems/test_gem_specification.rb
+index 0fcc11e78f..1c68826fb3 100644
+--- ruby-2.4.3/test/rubygems/test_gem_specification.rb
++++ ruby-2.4.3/test/rubygems/test_gem_specification.rb
+@@ -2890,7 +2890,22 @@ def test_validate_homepage
+         @a1.validate
+       end
+ 
+-      assert_equal '"over at my cool site" is not a URI', e.message
++      assert_equal '"over at my cool site" is not a valid HTTP URI', e.message
++
++      @a1.homepage = 'ftp://rubygems.org'
++
++      e = assert_raises Gem::InvalidSpecificationException do
++        @a1.validate
++      end
++
++      assert_equal '"ftp://rubygems.org" is not a valid HTTP URI', e.message
++
++      @a1.homepage = 'http://rubygems.org'
++      assert_equal true, @a1.validate
++
++      @a1.homepage = 'https://rubygems.org'
++      assert_equal true, @a1.validate
++
+     end
+   end
+ 
diff --git a/gnu/packages/ruby.scm b/gnu/packages/ruby.scm
index 00b24b26f4..90e3e4fcf7 100644
--- a/gnu/packages/ruby.scm
+++ b/gnu/packages/ruby.scm
@@ -117,6 +117,7 @@ a focus on simplicity and productivity.")
        (sha256
         (base32
          "0l9bv67dgsphk42lmiskhrnh47hbyj6rfg2rcjx22xivpx07srr3"))
+       (patches (search-patches "ruby-rubygems-276-for-ruby24.patch"))
        (modules '((guix build utils)))
        (snippet `(begin
                    ;; Remove bundled libffi