https://git.ruby-lang.org/ruby.git/commit/?id=cea4a81056

From cea4a81056311f13ca1c17f26c9d2c21b5a017a6 Mon Sep 17 00:00:00 2001
From: ximenasandoval <ximena.sandoval.dh@g...>
Date: Wed, 29 Dec 2021 14:24:04 -0700
Subject: [rubygems/rubygems] Let fetch understand gem:version syntax

Fix version error message

Add tests to fetch error messages

Fix default version since is not necessary

https://github.com/rubygems/rubygems/commit/070620ebe4
---
 lib/rubygems/commands/fetch_command.rb           | 28 +++++--
 test/rubygems/test_gem_commands_fetch_command.rb | 97 ++++++++++++++++++++++++
 2 files changed, 118 insertions(+), 7 deletions(-)

diff --git a/lib/rubygems/commands/fetch_command.rb b/lib/rubygems/commands/fetch_command.rb
index 373851643d4..dd45fe20fdf 100644
--- a/lib/rubygems/commands/fetch_command.rb
+++ b/lib/rubygems/commands/fetch_command.rb
@@ -18,6 +18,10 @@ class Gem::Commands::FetchCommand < Gem::Command https://github.com/ruby/ruby/blob/trunk/lib/rubygems/commands/fetch_command.rb#L18
     add_version_option
     add_platform_option
     add_prerelease_option
+
+    add_option '--[no-]suggestions', 'Suggest alternates when gems are not found' do |value, options|
+      options[:suggest_alternate] = true
+    end
   end
 
   def arguments # :nodoc:
@@ -42,15 +46,27 @@ then repackaging it. https://github.com/ruby/ruby/blob/trunk/lib/rubygems/commands/fetch_command.rb#L46
     "#{program_name} GEMNAME [GEMNAME ...]"
   end
 
+  def check_version # :nodoc:
+    if options[:version] and options[:version] != Gem::Requirement.default and
+         get_all_gem_names.size > 1
+      alert_error "Can't use --version with multiple gems. You can specify multiple gems with" \
+                  " version requirements using `gem fetch 'my_gem:1.0.0' 'my_other_gem:~>2.0.0'`"
+      terminate_interaction 1
+    end
+  end
+
   def execute
-    version = options[:version] || Gem::Requirement.default
+    check_version
+    version = options[:version]
 
     platform  = Gem.platforms.last
-    gem_names = get_all_gem_names
+    gem_names = get_all_gem_names_and_versions
 
-    gem_names.each do |gem_name|
-      dep = Gem::Dependency.new gem_name, version
+    gem_names.each do |gem_name, gem_version|
+      gem_version ||= version
+      dep = Gem::Dependency.new gem_name, gem_version
       dep.prerelease = options[:prerelease]
+      suppress_suggestions = options[:suggest_alternate]
 
       specs_and_sources, errors =
         Gem::SpecFetcher.fetcher.spec_for_dependency dep
@@ -63,12 +79,10 @@ then repackaging it. https://github.com/ruby/ruby/blob/trunk/lib/rubygems/commands/fetch_command.rb#L79
       spec, source = specs_and_sources.max_by {|s,| s }
 
       if spec.nil?
-        show_lookup_failure gem_name, version, errors, options[:domain]
+        show_lookup_failure gem_name, gem_version, errors, suppress_suggestions, options[:domain]
         next
       end
-
       source.download spec
-
       say "Downloaded #{spec.full_name}"
     end
   end
diff --git a/test/rubygems/test_gem_commands_fetch_command.rb b/test/rubygems/test_gem_commands_fetch_command.rb
index c745648d569..550c05b998f 100644
--- a/test/rubygems/test_gem_commands_fetch_command.rb
+++ b/test/rubygems/test_gem_commands_fetch_command.rb
@@ -157,4 +157,101 @@ class TestGemCommandsFetchCommand < Gem::TestCase https://github.com/ruby/ruby/blob/trunk/test/rubygems/test_gem_commands_fetch_command.rb#L157
     assert_path_exist(File.join(@tempdir, a1.file_name),
                        "#{a1.full_name} not fetched")
   end
+
+  def test_execute_version_specified_by_colon
+    specs = spec_fetcher do |fetcher|
+      fetcher.gem 'a', 1
+    end
+
+    @cmd.options[:args] = %w[a:1]
+
+    use_ui @ui do
+      Dir.chdir @tempdir do
+        @cmd.execute
+      end
+    end
+
+    a1 = specs['a-1']
+
+    assert_path_exist(File.join(@tempdir, a1.file_name),
+                       "#{a1.full_name} not fetched")
+  end
+
+  def test_execute_two_version
+    @cmd.options[:args] = %w[a b]
+    @cmd.options[:version] = Gem::Requirement.new '1'
+
+    use_ui @ui do
+      assert_raise Gem::MockGemUi::TermError, @ui.error do
+        @cmd.execute
+      end
+    end
+
+    msg = "ERROR:  Can't use --version with multiple gems. You can specify multiple gems with" \
+      " version requirements using `gem fetch 'my_gem:1.0.0' 'my_other_gem:~>2.0.0'`"
+
+    assert_empty @ui.output
+    assert_equal msg, @ui.error.chomp
+  end
+
+  def test_execute_two_version_specified_by_colon
+    specs = spec_fetcher do |fetcher|
+      fetcher.gem 'a', 1
+      fetcher.gem 'b', 1
+    end
+
+    @cmd.options[:args] = %w[a:1 b:1]
+
+    use_ui @ui do
+      Dir.chdir @tempdir do
+        @cmd.execute
+      end
+    end
+
+    a1 = specs['a-1']
+    b1 = specs['b-1']
+
+    assert_path_exist(File.join(@tempdir, a1.file_name),
+                       "#{a1.full_name} not fetched")
+    assert_path_exist(File.join(@tempdir, b1.file_name),
+                       "#{b1.full_name} not fetched")
+  end
+
+  def test_execute_version_nonexistent
+    spec_fetcher do |fetcher|
+      fetcher.spec 'foo', 1
+    end
+
+    @cmd.options[:args] = %w[foo:2]
+
+    use_ui @ui do
+      @cmd.execute
+    end
+
+    expected = <<-EXPECTED
+ERROR:  Could not find a valid gem 'foo' (2) in any repository
+ERROR:  Possible alternatives: foo
+    EXPECTED
+
+    assert_equal expected, @ui.error
+  end
+
+  def test_execute_nonexistent_hint_disabled
+    spec_fetcher do |fetcher|
+      fetcher.spec 'foo', 1
+    end
+
+    @cmd.options[:args] = %w[foo:2]
+    @cmd.options[:suggest_alternate] = true
+
+    use_ui @ui do
+      @cmd.execute
+    end
+
+    expected = <<-EXPECTED
+ERROR:  Could not find a valid gem 'foo' (2) in any repository
+    EXPECTED
+
+    assert_equal expected, @ui.error
+  end
 end
-- 
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