SCANNERAPI-184 - read SONAR_HOST_URL env property (#69)

Author: jacek-poreda-sonarsource

api/src/main/java/org/sonarsource/scanner/api/EmbeddedScanner.java

@@ -41,6 +41,7 @@
  */
 public class EmbeddedScanner {
   private static final String BITBUCKET_CLOUD_ENV_VAR = "BITBUCKET_BUILD_NUMBER";
+  private static final String SONAR_HOST_URL_ENV_VAR = "SONAR_HOST_URL";
   private static final String SONARCLOUD_HOST = "https://sonarcloud.io";
   private final IsolatedLauncherFactory launcherFactory;
   private IsolatedLauncher launcher;
@@ -141,9 +142,12 @@ public void execute(Map<String, String> taskProps) {
   }
 
   private void initGlobalDefaultValues() {
+    String sonarHostUrl = system.getEnvironmentVariable(SONAR_HOST_URL_ENV_VAR);
     if (system.getEnvironmentVariable(BITBUCKET_CLOUD_ENV_VAR) != null) {
       setGlobalDefaultValue(ScannerProperties.HOST_URL, SONARCLOUD_HOST);
       logger.info("Bitbucket Cloud Pipelines detected");
+    } else if (sonarHostUrl != null) {
+      setGlobalDefaultValue(ScannerProperties.HOST_URL, sonarHostUrl);
     } else {
       setGlobalDefaultValue(ScannerProperties.HOST_URL, "http://localhost:9000");
     }

api/src/test/java/org/sonarsource/scanner/api/EmbeddedScannerTest.java

@@ -114,6 +114,15 @@ public void should_set_sonarcloud_as_host_if_executed_from_bitbucket_cloud() {
     assertThat(scanner.globalProperty("sonar.host.url", null)).isEqualTo("https://sonarcloud.io");
   }
 
+  @Test
+  public void should_set_url_from_env_as_host_if_host_env_var_provided() {
+    when(system.getEnvironmentVariable("SONAR_HOST_URL")).thenReturn("http://from-env.org:9000");
+
+    scanner.start();
+
+    assertThat(scanner.globalProperty("sonar.host.url", null)).isEqualTo("http://from-env.org:9000");
+  }
+
   @Test
   public void should_set_properties() {
     EmbeddedScanner scanner = EmbeddedScanner.create("test", "1.0", mock(LogOutput.class));

api/src/test/java/org/sonarsource/scanner/api/UtilsTest.java

@@ -78,7 +78,7 @@ public void task_should_not_require_project() {
   public void delete_non_empty_directory() throws IOException {
     /*-
      * Create test structure:
-     * tmp 
+     * tmp
      *   |-folder1
      *        |- file1
      *        |- folder2