[rubygems/rubygems] Fix bundle lock --add-checksums when gems are already installed

https://github.com/rubygems/rubygems/commit/a087c452ad

lib/bundler/definition.rb

@@ -186,13 +186,13 @@ module Bundler
     def setup_domain!(options = {})
       prefer_local! if options[:"prefer-local"]
 
-      if options[:local] || no_install_needed?
-        Bundler.settings.set_command_option(:jobs, 1) if no_install_needed? # to avoid the overhead of Bundler::Worker
-        with_cache!
-        false
-      else
+      if options[:add_checksums] || (!options[:local] && install_needed?)
         remotely!
         true
+      else
+        Bundler.settings.set_command_option(:jobs, 1) unless install_needed? # to avoid the overhead of Bundler::Worker
+        with_cache!
+        false
       end
     end
 
@@ -513,26 +513,11 @@ module Bundler
     end
 
     def nothing_changed?
-      return false unless lockfile_exists?
-
-      !@source_changes &&
-        !@dependency_changes &&
-        !@current_platform_missing &&
-        @new_platforms.empty? &&
-        !@path_changes &&
-        !@local_changes &&
-        !@missing_lockfile_dep &&
-        !@unlocking_bundler &&
-        !@locked_spec_with_missing_deps &&
-        !@locked_spec_with_invalid_deps
-    end
-
-    def no_install_needed?
-      no_resolve_needed? && !missing_specs?
+      !something_changed?
     end
 
     def no_resolve_needed?
-      !unlocking? && nothing_changed?
+      !resolve_needed?
     end
 
     def unlocking?
@@ -544,13 +529,36 @@ module Bundler
     def add_checksums
       @locked_checksums = true
 
-      setup_domain!
+      setup_domain!(add_checksums: true)
 
       specs # force materialization to real specifications, so that checksums are fetched
     end
 
     private
 
+    def install_needed?
+      resolve_needed? || missing_specs?
+    end
+
+    def something_changed?
+      return true unless lockfile_exists?
+
+      @source_changes ||
+        @dependency_changes ||
+        @current_platform_missing ||
+        @new_platforms.any? ||
+        @path_changes ||
+        @local_changes ||
+        @missing_lockfile_dep ||
+        @unlocking_bundler ||
+        @locked_spec_with_missing_deps ||
+        @locked_spec_with_invalid_deps
+    end
+
+    def resolve_needed?
+      unlocking? || something_changed?
+    end
+
     def should_add_extra_platforms?
       !lockfile_exists? && generic_local_platform_is_ruby? && !Bundler.settings[:force_ruby_platform]
     end

spec/bundler/commands/lock_spec.rb

@@ -1894,6 +1894,68 @@ RSpec.describe "bundle lock" do
     L
   end
 
+  it "adds checksums to an existing lockfile, when gems are already installed" do
+    build_repo4 do
+      build_gem "nokogiri", "1.14.2"
+      build_gem "nokogiri", "1.14.2" do |s|
+        s.platform = "x86_64-linux"
+      end
+    end
+
+    gemfile <<-G
+      source "https://gem.repo4"
+
+      gem "nokogiri"
+    G
+
+    lockfile <<~L
+      GEM
+        remote: https://gem.repo4/
+        specs:
+          nokogiri (1.14.2)
+          nokogiri (1.14.2-x86_64-linux)
+
+      PLATFORMS
+        ruby
+        x86_64-linux
+
+      DEPENDENCIES
+        nokogiri
+
+      BUNDLED WITH
+         #{Bundler::VERSION}
+    L
+
+    simulate_platform "x86_64-linux" do
+      bundle "install"
+
+      bundle "lock --add-checksums"
+    end
+
+    checksums = checksums_section do |c|
+      c.checksum gem_repo4, "nokogiri", "1.14.2"
+      c.checksum gem_repo4, "nokogiri", "1.14.2", "x86_64-linux"
+    end
+
+    expect(lockfile).to eq <<~L
+      GEM
+        remote: https://gem.repo4/
+        specs:
+          nokogiri (1.14.2)
+          nokogiri (1.14.2-x86_64-linux)
+
+      PLATFORMS
+        ruby
+        x86_64-linux
+
+      DEPENDENCIES
+        nokogiri
+      #{checksums}
+      BUNDLED WITH
+         #{Bundler::VERSION}
+    L
+  end
+
   it "generates checksums by default if configured to do so" do
     build_repo4 do
       build_gem "nokogiri", "1.14.2"