Install RBS for indirect dependency

lib/rbs/collection/config/lockfile_generator.rb

@@ -107,25 +107,27 @@ def generate
               if src_data
                 Sources.from_config_entry(src_data)
               else
-                find_source(name: name) or return
+                find_source(name: name)
               end
 
-            installed_version = version
-            best_version = find_best_version(version: installed_version, versions: source.versions(name))
+            if source
+              installed_version = version
+              best_version = find_best_version(version: installed_version, versions: source.versions(name))
 
-            locked = {
-              name: name,
-              version: best_version.to_s,
-              source: source,
-            }
+              locked = {
+                name: name,
+                version: best_version.to_s,
+                source: source,
+              }
+            end
           end
 
-          locked or raise
-
-          lockfile.gems[name] = locked
+          if locked
+            lockfile.gems[name] = locked
 
-          locked[:source].dependencies_of(locked[:name], locked[:version])&.each do |dep|
-            assign_stdlib(name: dep["name"], from_gem: name)
+            locked[:source].dependencies_of(locked[:name], locked[:version])&.each do |dep|
+              assign_stdlib(name: dep["name"], from_gem: name)
+            end
           end
 
           gem_hash[name].dependencies.each do |dep|

test/rbs/collection/config_test.rb

@@ -585,6 +585,70 @@ def test_generate_lock_from_bundler_require_false
     end
   end
 
+  def test_generate_lock_install_indirect_dependency
+    mktmpdir do |tmpdir|
+      config_path = tmpdir / 'rbs_collection.yaml'
+      config_path.write [CONFIG, <<~YAML].join("\n")
+        sources:
+          - type: git
+            name: ruby/gem_rbs_collection
+            remote: https://github.com/ruby/gem_rbs_collection.git
+            revision: cde6057e7546843ace6420c5783dd945c6ccda54
+            repo_dir: gems
+        path: '.gem_rbs_collection'
+        gems: []
+      YAML
+      gemfile_path = tmpdir / 'Gemfile'
+      gemfile_path.write <<~GEMFILE
+        source 'https://rubygems.org'
+
+        gem "parser"
+      GEMFILE
+      gemfile_lock_path = tmpdir / 'Gemfile.lock'
+      gemfile_lock_path.write <<~GEMFILE_LOCK
+        GEM
+          remote: https://rubygems.org/
+          specs:
+            parser (3.2.0.0)
+              ast (~> 2.4.1)
+            ast (2.4.2)
+
+        PLATFORMS
+          x86_64-linux
+
+        DEPENDENCIES
+          parser
+
+        BUNDLED WITH
+           2.2.0
+      GEMFILE_LOCK
+
+      definition = Bundler::Definition.build(gemfile_path, gemfile_lock_path, false)
+      _config, lockfile = RBS::Collection::Config.generate_lockfile(config_path: config_path, definition: definition)
+      string = YAML.dump(lockfile.to_lockfile)
+
+      assert_config <<~YAML, string
+        sources:
+          - type: git
+            name: ruby/gem_rbs_collection
+            remote: https://github.com/ruby/gem_rbs_collection.git
+            revision: cde6057e7546843ace6420c5783dd945c6ccda54
+            repo_dir: gems
+        path: ".gem_rbs_collection"
+        gemfile_lock_path: 'Gemfile.lock'
+        gems:
+          - name: ast
+            version: "2.4"
+            source:
+              name: ruby/gem_rbs_collection
+              remote: https://github.com/ruby/gem_rbs_collection.git
+              revision: cde6057e7546843ace6420c5783dd945c6ccda54
+              repo_dir: gems
+              type: git
+      YAML
+    end
+  end
+
   private def assert_config(expected_str, actual_str)
     assert_equal YAML.load(expected_str), YAML.load(actual_str)
   end