Add explicit build flag for experimenting with test execution cacheability (#42649)

* Add build flag for ignoring random test seed as task input

* Fix checkstyle violations

buildSrc/src/main/groovy/org/elasticsearch/gradle/BuildPlugin.groovy

@@ -843,7 +843,7 @@ class BuildPlugin implements Plugin<Project> {
                 }
 
                 test.jvmArgumentProviders.add(nonInputProperties)
-                test.extensions.getByType(ExtraPropertiesExtension).set('nonInputProperties', nonInputProperties)
+                test.extensions.add('nonInputProperties', nonInputProperties)
 
                 test.executable = "${ext.get('runtimeJavaHome')}/bin/java"
                 test.workingDir = project.file("${project.buildDir}/testrun/${test.name}")
@@ -865,7 +865,8 @@ class BuildPlugin implements Plugin<Project> {
                 }
 
                 // we use './temp' since this is per JVM and tests are forbidden from writing to CWD
-                test.systemProperties 'java.io.tmpdir': './temp',
+                test.systemProperties 'gradle.dist.lib': new File(project.class.location.toURI()).parent,
+                        'java.io.tmpdir': './temp',
                         'java.awt.headless': 'true',
                         'tests.gradle': 'true',
                         'tests.artifact': project.name,
@@ -881,7 +882,6 @@ class BuildPlugin implements Plugin<Project> {
                 }
 
                 // don't track these as inputs since they contain absolute paths and break cache relocatability
-                nonInputProperties.systemProperty('gradle.dist.lib', new File(project.class.location.toURI()).parent)
                 nonInputProperties.systemProperty('gradle.worker.jar', "${project.gradle.getGradleUserHomeDir()}/caches/${project.gradle.gradleVersion}/workerMain/gradle-worker.jar")
                 nonInputProperties.systemProperty('gradle.user.home', project.gradle.getGradleUserHomeDir())
 
@@ -1007,19 +1007,4 @@ class BuildPlugin implements Plugin<Project> {
             })
         }
     }
-
-    private static class SystemPropertyCommandLineArgumentProvider implements CommandLineArgumentProvider {
-        private final Map<String, Object> systemProperties = [:]
-
-        void systemProperty(String key, Object value) {
-            systemProperties.put(key, value)
-        }
-
-        @Override
-        Iterable<String> asArguments() {
-            return systemProperties.collect { key, value ->
-                "-D${key}=${value.toString()}".toString()
-            }
-        }
-    }
 }

buildSrc/src/main/java/org/elasticsearch/gradle/SystemPropertyCommandLineArgumentProvider.java

@@ -0,0 +1,30 @@
+package org.elasticsearch.gradle;
+
+import org.gradle.api.tasks.Input;
+import org.gradle.process.CommandLineArgumentProvider;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+public class SystemPropertyCommandLineArgumentProvider implements CommandLineArgumentProvider {
+    private final Map<String, Object> systemProperties = new LinkedHashMap<>();
+
+    public void systemProperty(String key, Object value) {
+        systemProperties.put(key, value);
+    }
+
+    @Override
+    public Iterable<String> asArguments() {
+        return systemProperties.entrySet()
+            .stream()
+            .map(entry -> "-D" + entry.getKey() + "=" + entry.getValue())
+            .collect(Collectors.toList());
+    }
+
+    // Track system property keys as an input so our build cache key will change if we add properties but values are still ignored
+    @Input
+    public Iterable<String> getPropertyNames() {
+        return systemProperties.keySet();
+    }
+}

buildSrc/src/main/java/org/elasticsearch/gradle/testfixtures/TestFixturesPlugin.java

@@ -22,7 +22,9 @@ import com.avast.gradle.dockercompose.ComposeExtension;
 import com.avast.gradle.dockercompose.DockerComposePlugin;
 import com.avast.gradle.dockercompose.tasks.ComposeUp;
 import org.elasticsearch.gradle.OS;
+import org.elasticsearch.gradle.SystemPropertyCommandLineArgumentProvider;
 import org.elasticsearch.gradle.precommit.TestingConventionsTasks;
+import org.gradle.api.Action;
 import org.gradle.api.DefaultTask;
 import org.gradle.api.Plugin;
 import org.gradle.api.Project;
@@ -142,7 +144,8 @@ public class TestFixturesPlugin implements Plugin<Project> {
                 configureServiceInfoForTask(
                     task,
                     fixtureProject,
-                    task::systemProperty
+                    (name, host) ->
+                        task.getExtensions().getByType(SystemPropertyCommandLineArgumentProvider.class).systemProperty(name, host)
                 );
                 task.dependsOn(fixtureProject.getTasks().getByName("postProcessFixture"));
             })
@@ -165,7 +168,9 @@ public class TestFixturesPlugin implements Plugin<Project> {
     private void configureServiceInfoForTask(Task task, Project fixtureProject, BiConsumer<String, Integer> consumer) {
         // Configure ports for the tests as system properties.
         // We only know these at execution time so we need to do it in doFirst
-        task.doFirst(theTask ->
+        task.doFirst(new Action<Task>() {
+                         @Override
+                         public void execute(Task theTask) {
                              fixtureProject.getExtensions().getByType(ComposeExtension.class).getServicesInfos()
                                  .forEach((service, infos) -> {
                                      infos.getTcpPorts()
@@ -186,7 +191,9 @@ public class TestFixturesPlugin implements Plugin<Project> {
                                                  host
                                              );
                                          });
-                })
+                                 });
+                         }
+                     }
         );
     }