1 files changed, 43 insertions, 0 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/util/OS.java b/src/main/java/com/google/devtools/build/lib/util/OS.java
new file mode 100644
index 0000000000..b19bd7e301
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/util/OS.java
@@ -0,0 +1,43 @@
+// Copyright 2014 Google Inc. All rights reserved.
+//
+// Licensed 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 com.google.devtools.build.lib.util;
+
+/**
+ * An operating system.
+ */
+public enum OS {
+  DARWIN,
+  LINUX,
+  WINDOWS,
+  UNKNOWN;
+
+  /**
+   * The current operating system.
+   */
+  public static OS getCurrent() {
+    return HOST_SYSTEM;
+  }
+  // We inject a the OS name through blaze.os, so we can have
+  // some coverage for Windows specific code on Linux.
+  private static String getOsName() {
+    String override = System.getProperty("blaze.os");
+    return override == null ? System.getProperty("os.name") : override;
+  }
+
+  private static final OS HOST_SYSTEM =
+      "Mac OS X".equals(getOsName()) ? OS.DARWIN : (
+      "Linux".equals(getOsName()) ? OS.LINUX : (
+          getOsName().contains("Windows") ? OS.WINDOWS : OS.UNKNOWN));
+}
+