Support Gradle files with no top level build.gradle file

gradle/lib/dependabot/gradle/file_fetcher.rb

@@ -28,7 +28,7 @@ def self.required_files_message
 
       def fetch_files
         fetched_files = []
-        fetched_files << buildfile
+        fetched_files << buildfile if buildfile
         fetched_files += subproject_buildfiles
         fetched_files += dependency_script_plugins
         check_required_files_present
@@ -46,17 +46,23 @@ def buildfile
       def subproject_buildfiles
         return [] unless settings_file
 
-        subproject_paths =
-          SettingsFileParser.
-          new(settings_file: settings_file).
-          subproject_paths
-
-        subproject_paths.map do |path|
-          fetch_file_from_host(File.join(path, @buildfile_name))
-        rescue Dependabot::DependencyFileNotFound
-          # Gradle itself doesn't worry about missing subprojects, so we don't
-          nil
-        end.compact
+        @subproject_buildfiles ||= begin
+          subproject_paths =
+            SettingsFileParser.
+            new(settings_file: settings_file).
+            subproject_paths
+
+          subproject_paths.map do |path|
+            if @buildfile_name
+              fetch_file_from_host(File.join(path, @buildfile_name))
+            else
+              supported_file(SUPPORTED_BUILD_FILE_NAMES.map { |f| File.join(path, f) })
+            end
+          rescue Dependabot::DependencyFileNotFound
+            # Gradle itself doesn't worry about missing subprojects, so we don't
+            nil
+          end.compact
+        end
       end
 
       # rubocop:disable Metrics/PerceivedComplexity
@@ -83,7 +89,7 @@ def dependency_script_plugins
       # rubocop:enable Metrics/PerceivedComplexity
 
       def check_required_files_present
-        return if buildfile
+        return if buildfile || (subproject_buildfiles && !subproject_buildfiles.empty?)
 
         path = Pathname.new(File.join(directory, "build.gradle")).cleanpath.to_path
         path += "(.kts)?"

gradle/lib/dependabot/gradle/file_parser.rb

@@ -321,7 +321,7 @@ def script_plugin_files
       end
 
       def check_required_files
-        raise "No build.gradle or build.gradle.kts!" unless original_file
+        raise "No build.gradle or build.gradle.kts!" if dependency_files.empty?
       end
 
       def original_file

gradle/lib/dependabot/gradle/file_updater.rb

@@ -40,7 +40,7 @@ def updated_dependency_files
       private
 
       def check_required_files
-        raise "No build.gradle or build.gradle.kts!" unless original_file
+        raise "No build.gradle or build.gradle.kts!" if dependency_files.empty?
       end
 
       def original_file

gradle/spec/dependabot/gradle/file_fetcher_spec.rb

@@ -17,6 +17,15 @@
   let(:file_fetcher_instance) do
     described_class.new(source: source, credentials: credentials)
   end
+  def stub_content_request(path, fixture)
+    stub_request(:get, File.join(url, path)).
+      with(headers: { "Authorization" => "token token" }).
+      to_return(
+        status: 200,
+        body: fixture("github", fixture),
+        headers: { "content-type" => "application/json" }
+      )
+  end
   let(:directory) { "/" }
   let(:github_url) { "https://api.github.com/" }
   let(:url) { github_url + "repos/gocardless/bump/contents/" }
@@ -33,20 +42,8 @@
 
   context "with a basic buildfile" do
     before do
-      stub_request(:get, url + "?ref=sha").
-        with(headers: { "Authorization" => "token token" }).
-        to_return(
-          status: 200,
-          body: fixture("github", "contents_java.json"),
-          headers: { "content-type" => "application/json" }
-        )
-      stub_request(:get, File.join(url, "build.gradle?ref=sha")).
-        with(headers: { "Authorization" => "token token" }).
-        to_return(
-          status: 200,
-          body: fixture("github", "contents_java_basic_buildfile.json"),
-          headers: { "content-type" => "application/json" }
-        )
+      stub_content_request("?ref=sha", "contents_java.json")
+      stub_content_request("build.gradle?ref=sha", "contents_java_basic_buildfile.json")
     end
 
     it "fetches the buildfile" do
@@ -57,27 +54,9 @@
 
     context "with a settings.gradle" do
       before do
-        stub_request(:get, url + "?ref=sha").
-          with(headers: { "Authorization" => "token token" }).
-          to_return(
-            status: 200,
-            body: fixture("github", "contents_java_with_settings.json"),
-            headers: { "content-type" => "application/json" }
-          )
-        stub_request(:get, File.join(url, "settings.gradle?ref=sha")).
-          with(headers: { "Authorization" => "token token" }).
-          to_return(
-            status: 200,
-            body: fixture("github", "contents_java_simple_settings.json"),
-            headers: { "content-type" => "application/json" }
-          )
-        stub_request(:get, File.join(url, "app/build.gradle?ref=sha")).
-          with(headers: { "Authorization" => "token token" }).
-          to_return(
-            status: 200,
-            body: fixture("github", "contents_java_basic_buildfile.json"),
-            headers: { "content-type" => "application/json" }
-          )
+        stub_content_request("?ref=sha", "contents_java_with_settings.json")
+        stub_content_request("settings.gradle?ref=sha", "contents_java_simple_settings.json")
+        stub_content_request("app/build.gradle?ref=sha", "contents_java_basic_buildfile.json")
       end
 
       it "fetches the main buildfile and subproject buildfile" do
@@ -101,22 +80,25 @@
       end
     end
 
+    context "only a settings.gradle" do
+      before do
+        stub_content_request("?ref=sha", "contents_java_only_settings.json")
+        stub_content_request("app?ref=sha", "contents_java_subproject.json")
+        stub_content_request("settings.gradle?ref=sha", "contents_java_simple_settings.json")
+        stub_content_request("app/build.gradle?ref=sha", "contents_java_basic_buildfile.json")
+      end
+
+      it "fetches the main buildfile and subproject buildfile" do
+        expect(file_fetcher_instance.files.count).to eq(1)
+        expect(file_fetcher_instance.files.map(&:name)).
+          to match_array(%w(app/build.gradle))
+      end
+    end
+
     context "with kotlin" do
       before do
-        stub_request(:get, url + "?ref=sha").
-          with(headers: { "Authorization" => "token token" }).
-          to_return(
-            status: 200,
-            body: fixture("github", "contents_kotlin.json"),
-            headers: { "content-type" => "application/json" }
-          )
-        stub_request(:get, File.join(url, "build.gradle.kts?ref=sha")).
-          with(headers: { "Authorization" => "token token" }).
-          to_return(
-            status: 200,
-            body: fixture("github", "contents_kotlin_basic_buildfile.json"),
-            headers: { "content-type" => "application/json" }
-          )
+        stub_content_request("?ref=sha", "contents_kotlin.json")
+        stub_content_request("build.gradle.kts?ref=sha", "contents_kotlin_basic_buildfile.json")
         stub_request(:get, File.join(url, "settings.gradle.kts?ref=sha")).
           with(headers: { "Authorization" => "token token" }).
           to_return(status: 404)
@@ -130,27 +112,9 @@
 
       context "with a settings.gradle.kts" do
         before do
-          stub_request(:get, url + "?ref=sha").
-            with(headers: { "Authorization" => "token token" }).
-            to_return(
-              status: 200,
-              body: fixture("github", "contents_kotlin_with_settings.json"),
-              headers: { "content-type" => "application/json" }
-            )
-          stub_request(:get, File.join(url, "settings.gradle.kts?ref=sha")).
-            with(headers: { "Authorization" => "token token" }).
-            to_return(
-              status: 200,
-              body: fixture("github", "contents_kotlin_simple_settings.json"),
-              headers: { "content-type" => "application/json" }
-            )
-          stub_request(:get, File.join(url, "app/build.gradle.kts?ref=sha")).
-            with(headers: { "Authorization" => "token token" }).
-            to_return(
-              status: 200,
-              body: fixture("github", "contents_kotlin_basic_buildfile.json"),
-              headers: { "content-type" => "application/json" }
-            )
+          stub_content_request("?ref=sha", "contents_kotlin_with_settings.json")
+          stub_content_request("settings.gradle.kts?ref=sha", "contents_kotlin_simple_settings.json")
+          stub_content_request("app/build.gradle.kts?ref=sha", "contents_kotlin_basic_buildfile.json")
         end
 
         it "fetches the main buildfile and subproject buildfile" do
@@ -164,30 +128,9 @@
 
   context "with a script plugin" do
     before do
-      stub_request(:get, url + "?ref=sha").
-        with(headers: { "Authorization" => "token token" }).
-        to_return(
-          status: 200,
-          body: fixture("github", "contents_java.json"),
-          headers: { "content-type" => "application/json" }
-        )
-      stub_request(:get, File.join(url, "build.gradle?ref=sha")).
-        with(headers: { "Authorization" => "token token" }).
-        to_return(
-          status: 200,
-          body: fixture(
-            "github",
-            "contents_java_buildfile_with_script_plugins.json"
-          ),
-          headers: { "content-type" => "application/json" }
-        )
-      stub_request(:get, File.join(url, "gradle/dependencies.gradle?ref=sha")).
-        with(headers: { "Authorization" => "token token" }).
-        to_return(
-          status: 200,
-          body: fixture("github", "contents_java_simple_settings.json"),
-          headers: { "content-type" => "application/json" }
-        )
+      stub_content_request("?ref=sha", "contents_java.json")
+      stub_content_request("build.gradle?ref=sha", "contents_java_buildfile_with_script_plugins.json")
+      stub_content_request("gradle/dependencies.gradle?ref=sha", "contents_java_simple_settings.json")
     end
 
     it "fetches the buildfile and the dependencies script" do
@@ -198,26 +141,14 @@
 
     context "that can't be found" do
       before do
-        stub_request(:get, url + "?ref=sha").
-          with(headers: { "Authorization" => "token token" }).
-          to_return(
-            status: 200,
-            body: fixture("github", "contents_java.json"),
-            headers: { "content-type" => "application/json" }
-          )
+        stub_content_request("?ref=sha", "contents_java.json")
         stub_request(
           :get,
           File.join(url, "gradle/dependencies.gradle?ref=sha")
         ).with(headers: { "Authorization" => "token token" }).
           to_return(status: 404)
 
-        stub_request(:get, File.join(url, "gradle?ref=sha")).
-          with(headers: { "Authorization" => "token token" }).
-          to_return(
-            status: 200,
-            body: fixture("github", "contents_with_settings.json"),
-            headers: { "content-type" => "application/json" }
-          )
+        stub_content_request("gradle?ref=sha", "contents_with_settings.json")
       end
 
       it "raises a DependencyFileNotFound error" do

gradle/spec/fixtures/github/contents_java_only_settings.json

@@ -0,0 +1,66 @@
+[
+  {
+    "name": ".gitignore",
+    "path": ".gitignore",
+    "sha": "a1fc39c070f4f8ba52f278c15cd4d2121d07c8a8",
+    "size": 308,
+    "url": "https://api.github.com/repos/dependabot-fixtures/gradle-with-settings/contents/.gitignore?ref=main",
+    "html_url": "https://github.com/dependabot-fixtures/gradle-with-settings/blob/main/.gitignore",
+    "git_url": "https://api.github.com/repos/dependabot-fixtures/gradle-with-settings/git/blobs/a1fc39c070f4f8ba52f278c15cd4d2121d07c8a8",
+    "download_url": "https://raw.githubusercontent.com/dependabot-fixtures/gradle-with-settings/main/.gitignore",
+    "type": "file",
+    "_links": {
+      "self": "https://api.github.com/repos/dependabot-fixtures/gradle-with-settings/contents/.gitignore?ref=main",
+      "git": "https://api.github.com/repos/dependabot-fixtures/gradle-with-settings/git/blobs/a1fc39c070f4f8ba52f278c15cd4d2121d07c8a8",
+      "html": "https://github.com/dependabot-fixtures/gradle-with-settings/blob/main/.gitignore"
+    }
+  },
+  {
+    "name": "dependencies",
+    "path": "dependencies",
+    "sha": "5df7f650b80fef281199e7d1c6bf53c6a5280802",
+    "size": 0,
+    "url": "https://api.github.com/repos/dependabot-fixtures/gradle-with-settings/contents/dependencies?ref=main",
+    "html_url": "https://github.com/dependabot-fixtures/gradle-with-settings/tree/main/dependencies",
+    "git_url": "https://api.github.com/repos/dependabot-fixtures/gradle-with-settings/git/trees/5df7f650b80fef281199e7d1c6bf53c6a5280802",
+    "download_url": null,
+    "type": "dir",
+    "_links": {
+      "self": "https://api.github.com/repos/dependabot-fixtures/gradle-with-settings/contents/dependencies?ref=main",
+      "git": "https://api.github.com/repos/dependabot-fixtures/gradle-with-settings/git/trees/5df7f650b80fef281199e7d1c6bf53c6a5280802",
+      "html": "https://github.com/dependabot-fixtures/gradle-with-settings/tree/main/dependencies"
+    }
+  },
+  {
+    "name": "pom.xml",
+    "path": "pom.xml",
+    "sha": "9a0a1f4bb5db4083b7f4ba9d8fee33675de8dc62",
+    "size": 15579,
+    "url": "https://api.github.com/repos/dependabot-fixtures/gradle-with-settings/contents/pom.xml?ref=main",
+    "html_url": "https://github.com/dependabot-fixtures/gradle-with-settings/blob/main/pom.xml",
+    "git_url": "https://api.github.com/repos/dependabot-fixtures/gradle-with-settings/git/blobs/9a0a1f4bb5db4083b7f4ba9d8fee33675de8dc62",
+    "download_url": "https://raw.githubusercontent.com/dependabot-fixtures/gradle-with-settings/main/pom.xml",
+    "type": "file",
+    "_links": {
+      "self": "https://api.github.com/repos/dependabot-fixtures/gradle-with-settings/contents/pom.xml?ref=main",
+      "git": "https://api.github.com/repos/dependabot-fixtures/gradle-with-settings/git/blobs/9a0a1f4bb5db4083b7f4ba9d8fee33675de8dc62",
+      "html": "https://github.com/dependabot-fixtures/gradle-with-settings/blob/main/pom.xml"
+    }
+  },
+  {
+    "name": "settings.gradle",
+    "path": "settings.gradle",
+    "sha": "a9fc565d30dbca65176e111b6d9a24351e146b4c",
+    "size": 38,
+    "url": "https://api.github.com/repos/dependabot-fixtures/gradle-with-settings/contents/settings.gradle?ref=main",
+    "html_url": "https://github.com/dependabot-fixtures/gradle-with-settings/blob/main/settings.gradle",
+    "git_url": "https://api.github.com/repos/dependabot-fixtures/gradle-with-settings/git/blobs/a9fc565d30dbca65176e111b6d9a24351e146b4c",
+    "download_url": "https://raw.githubusercontent.com/dependabot-fixtures/gradle-with-settings/main/settings.gradle",
+    "type": "file",
+    "_links": {
+      "self": "https://api.github.com/repos/dependabot-fixtures/gradle-with-settings/contents/settings.gradle?ref=main",
+      "git": "https://api.github.com/repos/dependabot-fixtures/gradle-with-settings/git/blobs/a9fc565d30dbca65176e111b6d9a24351e146b4c",
+      "html": "https://github.com/dependabot-fixtures/gradle-with-settings/blob/main/settings.gradle"
+    }
+  }
+]

gradle/spec/fixtures/github/contents_java_subproject.json

@@ -0,0 +1,18 @@
+[
+  {
+    "name": "build.gradle",
+    "path": "app/build.gradle",
+    "sha": "f036f9f0357a50b02a422923f0bb0c3719eaf8ae",
+    "size": 2355,
+    "url": "https://api.github.com/repos/dependabot-fixtures/gradle/contents/build.gradle?ref=main",
+    "html_url": "https://github.com/dependabot-fixtures/gradle/blob/main/build.gradle",
+    "git_url": "https://api.github.com/repos/dependabot-fixtures/gradle/git/blobs/f036f9f0357a50b02a422923f0bb0c3719eaf8ae",
+    "download_url": "https://raw.githubusercontent.com/dependabot-fixtures/gradle/main/build.gradle",
+    "type": "file",
+    "_links": {
+      "self": "https://api.github.com/repos/dependabot-fixtures/gradle/contents/build.gradle?ref=main",
+      "git": "https://api.github.com/repos/dependabot-fixtures/gradle/git/blobs/f036f9f0357a50b02a422923f0bb0c3719eaf8ae",
+      "html": "https://github.com/dependabot-fixtures/gradle/blob/main/build.gradle"
+    }
+  }
+]