[rubygems/rubygems] Fix incorrect error message in frozen mode

When Bundler refuses to install in frozen mode, sometimes it would
incorrectly claim that some dependencies have been added to the Gemfile
when that's not really the case. Fix that by making sure
`locked_dependencies` always has all locked dependencies, even when
unlocking,

Additionally, the suggestion to run `bundle install` is also confusing
when unlocking, since `bundle update` is what has been run. So skip that
part as well when unlocking.

https://github.com/rubygems/rubygems/commit/64d84ad7d8

lib/bundler/definition.rb

@@ -93,17 +93,15 @@ module Bundler
         @platforms = @locked_platforms.dup
         @locked_bundler_version = @locked_gems.bundler_version
         @locked_ruby_version = @locked_gems.ruby_version
-        @originally_locked_deps = @locked_gems.dependencies
+        @locked_deps = @locked_gems.dependencies
         @originally_locked_specs = SpecSet.new(@locked_gems.specs)
         @locked_checksums = @locked_gems.checksums
 
         if unlock != true
-          @locked_deps    = @originally_locked_deps
           @locked_specs   = @originally_locked_specs
           @locked_sources = @locked_gems.sources
         else
           @unlock         = {}
-          @locked_deps    = {}
           @locked_specs   = SpecSet.new([])
           @locked_sources = []
         end
@@ -115,7 +113,6 @@ module Bundler
         @platforms      = []
         @locked_deps    = {}
         @locked_specs   = SpecSet.new([])
-        @originally_locked_deps = {}
         @originally_locked_specs = @locked_specs
         @locked_sources = []
         @locked_checksums = Bundler.feature_flag.lockfile_checksums?
@@ -443,13 +440,13 @@ module Bundler
       msg << "\n\nYou have added to the Gemfile:\n" << added.join("\n") if added.any?
       msg << "\n\nYou have deleted from the Gemfile:\n" << deleted.join("\n") if deleted.any?
       msg << "\n\nYou have changed in the Gemfile:\n" << changed.join("\n") if changed.any?
-      msg << "\n\nRun `bundle install` elsewhere and add the updated #{SharedHelpers.relative_gemfile_path} to version control.\n"
+      msg << "\n\nRun `bundle install` elsewhere and add the updated #{SharedHelpers.relative_gemfile_path} to version control.\n" unless unlocking?
 
       unless explicit_flag
         suggested_command = unless Bundler.settings.locations("frozen").keys.include?(:env)
           "bundle config set frozen false"
         end
-        msg << "If this is a development machine, remove the #{SharedHelpers.relative_lockfile_path} " \
+        msg << "\n\nIf this is a development machine, remove the #{SharedHelpers.relative_lockfile_path} " \
                "freeze by running `#{suggested_command}`." if suggested_command
       end
 
@@ -944,7 +941,7 @@ module Bundler
           dep.source = sources.get(dep.source)
         end
 
-        unless locked_dep = @originally_locked_deps[dep.name]
+        unless locked_dep = @locked_deps[dep.name]
           changes = true
           next
         end

spec/bundler/commands/update_spec.rb

@@ -694,28 +694,36 @@ RSpec.describe "bundle update" do
       bundle "update", all: true, raise_on_error: false
 
       expect(last_command).to be_failure
-      expect(err).to match(/Bundler is unlocking, but the lockfile can't be updated because frozen mode is set/)
-      expect(err).to match(/freeze by running `bundle config set frozen false`./)
+      expect(err).to eq <<~ERROR.strip
+        Bundler is unlocking, but the lockfile can't be updated because frozen mode is set
+
+        If this is a development machine, remove the Gemfile.lock freeze by running `bundle config set frozen false`.
+      ERROR
     end
 
     it "should fail loudly when frozen is set globally" do
       bundle "config set --global frozen 1"
       bundle "update", all: true, raise_on_error: false
-      expect(err).to match(/Bundler is unlocking, but the lockfile can't be updated because frozen mode is set/).
-        and match(/freeze by running `bundle config set frozen false`./)
+      expect(err).to eq <<~ERROR.strip
+        Bundler is unlocking, but the lockfile can't be updated because frozen mode is set
+
+        If this is a development machine, remove the Gemfile.lock freeze by running `bundle config set frozen false`.
+      ERROR
     end
 
     it "should fail loudly when deployment is set globally" do
       bundle "config set --global deployment true"
       bundle "update", all: true, raise_on_error: false
-      expect(err).to match(/Bundler is unlocking, but the lockfile can't be updated because frozen mode is set/).
-        and match(/freeze by running `bundle config set frozen false`./)
+      expect(err).to eq <<~ERROR.strip
+        Bundler is unlocking, but the lockfile can't be updated because frozen mode is set
+
+        If this is a development machine, remove the Gemfile.lock freeze by running `bundle config set frozen false`.
+      ERROR
     end
 
     it "should not suggest any command to unfreeze bundler if frozen is set through ENV" do
       bundle "update", all: true, raise_on_error: false, env: { "BUNDLE_FROZEN" => "true" }
-      expect(err).to match(/Bundler is unlocking, but the lockfile can't be updated because frozen mode is set/)
-      expect(err).not_to match(/by running/)
+      expect(err).to eq("Bundler is unlocking, but the lockfile can't be updated because frozen mode is set")
     end
   end