SCANJLIB-280 Support zOS as a valid Operating System (#260)

Author: antoine-vinot-sonarsource

lib/src/main/java/org/sonarsource/scanner/lib/internal/util/OsResolver.java

@@ -50,6 +50,8 @@ public OperatingSystem getOs() {
         return OperatingSystem.WINDOWS;
       } else if (osNameLowerCase.contains("linux")) {
         return isAlpine() ? OperatingSystem.ALPINE : OperatingSystem.LINUX;
+      } else if (osNameLowerCase.contains("z/os")) {
+        return OperatingSystem.ZOS;
       }
     }
     throw new IllegalStateException(String.format("Failed to detect OS, use the property '%s' to set it manually.", SCANNER_OS));
@@ -75,6 +77,6 @@ private boolean isAlpine() {
    * Operating systems supported by the JRE provisioning.
    */
   public enum OperatingSystem {
-    LINUX, WINDOWS, MACOS, ALPINE
+    LINUX, WINDOWS, MACOS, ALPINE, ZOS
   }
 }

lib/src/test/java/org/sonarsource/scanner/lib/internal/util/OsResolverTest.java

@@ -96,6 +96,12 @@ void getOs_alpine() throws IOException {
     assertThat(underTest.getOs()).isEqualTo(OsResolver.OperatingSystem.LINUX);
   }
 
+  @Test
+  void getOs_zOS() {
+    when(system.getProperty(OS_NAME)).thenReturn("z/OS");
+    assertThat(underTest.getOs()).isEqualTo(OsResolver.OperatingSystem.ZOS);
+  }
+
   @Test
   void getOs_unknown() {
     when(system.getProperty(OS_NAME)).thenReturn("aix");