SQSCANNER-28 Support sonar.scanner.skip without connecting to server

it/src/test/java/com/sonar/runner/it/JavaTest.java

     orchestrator.executeBuild(build);
   }
 
+  @Test
+  public void should_skip_analysis() {
+    SonarScanner build = newScanner(new File("projects/java-sample"))
+      .setProperty("sonar.host.url", "http://foo")
+      .setEnvironmentVariable("SONARQUBE_SCANNER_PARAMS", "{ \"sonar.scanner.skip\":\"true\" }");
+
+    BuildResult result = orchestrator.executeBuild(build);
+    assertThat(result.getLogs()).contains("SonarQube Scanner analysis skipped");
+  }
+
   @Test
   public void should_fail_if_unable_to_connect() {
     SonarScanner build = newScanner(new File("projects/java-sample"))

pom.xml

     <dependency>
       <groupId>org.sonarsource.scanner.api</groupId>
       <artifactId>sonar-scanner-api</artifactId>
-      <version>2.7</version>
+      <version>2.8-build684</version>
     </dependency>
     <dependency>
       <groupId>com.google.code.findbugs</groupId>

src/main/java/org/sonarsource/scanner/cli/Main.java

 import java.io.IOException;
 import java.util.Properties;
 import org.sonarsource.scanner.api.EmbeddedScanner;
+import org.sonarsource.scanner.api.ScanProperties;
 
 /**
  * Arguments :
 
     try {
       Properties p = conf.properties();
+      checkSkip(p);
       configureLogging(p);
       init(p);
       runner.start();
     runner.stop();
     exit.exit(Exit.SUCCESS);
   }
+  
+  private void checkSkip(Properties properties) {
+    if ("true".equalsIgnoreCase(properties.getProperty(ScanProperties.SKIP))) {
+      logger.info("SonarQube Scanner analysis skipped");
+      exit.exit(Exit.SUCCESS);
+    }
+  }
 
   private void init(Properties p) throws IOException {
     SystemInfo.print(logger);

src/test/java/org/sonarsource/scanner/cli/MainTest.java

 import org.mockito.Mockito;
 import org.mockito.MockitoAnnotations;
 import org.sonarsource.scanner.api.EmbeddedScanner;
+import org.sonarsource.scanner.api.ScanProperties;
 
 import static org.fest.assertions.Assertions.assertThat;
 import static org.mockito.Matchers.any;
     inOrder.verify(runnerFactory, times(1)).create(p);
     inOrder.verify(exit, times(1)).exit(Exit.SUCCESS);
   }
+  
+  @Test
+  public void should_skip() throws IOException {
+    Properties p = new Properties();
+    p.setProperty(ScanProperties.SKIP, "true");
+    when(conf.properties()).thenReturn(p);
+
+    Main main = new Main(exit, cli, conf, runnerFactory, logs);
+    main.execute();
+
+    verify(logs).info("SonarQube Scanner analysis skipped");
+    InOrder inOrder = Mockito.inOrder(exit, runnerFactory);
+
+    inOrder.verify(exit, times(1)).exit(Exit.SUCCESS);
+    inOrder.verify(runnerFactory, times(1)).create(p);
+    inOrder.verify(exit, times(1)).exit(Exit.SUCCESS);
+  }
 
   @Test
   public void shouldLogServerVersion() throws IOException {