Migrate SysV init tests from bats to java packaging (elastic#51077)

This commit converts the sysv init tests from bats tests into the java
packaging tests. Since it is the last oss specific test, the bats oss
test task is also removed.

relates elastic#46005

Author: rjernst

buildSrc/src/main/java/org/elasticsearch/gradle/test/DistroTestPlugin.java

@@ -115,7 +115,6 @@ public void apply(Project project) {
             }
         }
         Map<String, TaskProvider<?>> batsTests = new HashMap<>();
-        batsTests.put("bats oss", configureBatsTest(project, "oss", distributionsDir, copyDistributionsTask));
         configureBatsTest(project, "plugins", distributionsDir, copyDistributionsTask, copyPluginsTask).configure(
             t -> t.setPluginsDir(pluginsDir)
         );

qa/os/bats/oss/70_sysv_initd.bats

@@ -58,7 +58,7 @@ tasks.dependenciesInfo.enabled = false
 tasks.thirdPartyAudit.ignoreMissingClasses()
 
 tasks.register('destructivePackagingTest') {
-  dependsOn 'destructiveDistroTest', 'destructiveBatsTest.oss'
+  dependsOn 'destructiveDistroTest' 
 }
 
 processTestResources {

qa/os/build.gradle

@@ -0,0 +1,110 @@
+/*
+ * Licensed to Elasticsearch under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.elasticsearch.packaging.test;
+
+import org.elasticsearch.packaging.util.Platforms;
+import org.elasticsearch.packaging.util.ServerUtils;
+import org.elasticsearch.packaging.util.Shell;
+import org.junit.BeforeClass;
+
+import java.nio.file.Files;
+
+import static org.elasticsearch.packaging.util.FileUtils.assertPathsExist;
+import static org.hamcrest.CoreMatchers.anyOf;
+import static org.hamcrest.CoreMatchers.equalTo;
+import static org.junit.Assume.assumeFalse;
+import static org.junit.Assume.assumeTrue;
+
+public class SysVInitTests extends PackagingTestCase {
+
+    @BeforeClass
+    public static void filterDistros() {
+        assumeTrue("rpm or deb", distribution.isPackage());
+        assumeTrue(Platforms.isSysVInit());
+        assumeFalse(Platforms.isSystemd());
+    }
+
+    @Override
+    public void startElasticsearch() throws Exception {
+        sh.run("service elasticsearch start");
+        ServerUtils.waitForElasticsearch(installation);
+        sh.run("service elasticsearch status");
+    }
+
+    @Override
+    public void stopElasticsearch() {
+        sh.run("service elasticsearch stop");
+    }
+
+    public void test10Install() throws Exception {
+        install();
+    }
+
+    public void test20Start() throws Exception {
+        startElasticsearch();
+        assertTrue("gc logs exist", Files.exists(installation.logs.resolve("gc.log")));
+        ServerUtils.runElasticsearchTests();
+        sh.run("service elasticsearch status"); // returns 0 exit status when ok
+    }
+
+    public void test21Restart() throws Exception {
+        sh.run("service elasticsearch restart");
+        sh.run("service elasticsearch status"); // returns 0 exit status when ok
+    }
+
+    public void test22Stop() throws Exception {
+        stopElasticsearch();
+        Shell.Result status = sh.runIgnoreExitCode("service elasticsearch status");
+        assertThat(status.exitCode, anyOf(equalTo(3), equalTo(4)));
+    }
+
+    public void test30PidDirCreation() throws Exception {
+        // Simulates the behavior of a system restart:
+        // the PID directory is deleted by the operating system
+        // but it should not block ES from starting
+        // see https://github.com/elastic/elasticsearch/issues/11594
+
+        sh.run("rm -rf " + installation.pidDir);
+        startElasticsearch();
+        assertPathsExist(installation.pidDir.resolve("elasticsearch.pid"));
+        stopElasticsearch();
+    }
+
+    public void test31MaxMapTooSmall() throws Exception {
+        sh.run("sysctl -q -w vm.max_map_count=262140");
+        startElasticsearch();
+        Shell.Result result = sh.run("sysctl -n vm.max_map_count");
+        String maxMapCount = result.stdout.strip();
+        sh.run("service elasticsearch stop");
+        assertThat(maxMapCount, equalTo("262144"));
+    }
+
+    public void test32MaxMapBigEnough() throws Exception {
+        // Ensures that if $MAX_MAP_COUNT is greater than the set
+        // value on the OS we do not attempt to update it.
+        sh.run("sysctl -q -w vm.max_map_count=262145");
+        startElasticsearch();
+        Shell.Result result = sh.run("sysctl -n vm.max_map_count");
+        String maxMapCount = result.stdout.strip();
+        sh.run("service elasticsearch stop");
+        assertThat(maxMapCount, equalTo("262145"));
+    }
+
+}