1 files changed, 58 insertions, 0 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/util/UserUtils.java b/src/main/java/com/google/devtools/build/lib/util/UserUtils.java
new file mode 100644
index 0000000000..93e2a662af
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/util/UserUtils.java
@@ -0,0 +1,58 @@
+// 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;
+
+import com.google.common.base.Strings;
+
+import java.util.Map;
+
+/**
+ * User information utility methods.
+ */
+public final class UserUtils {
+
+  private static final String ORIGINATING_USER_KEY = "BLAZE_ORIGINATING_USER";
+
+  private UserUtils() {
+    // prohibit instantiation
+  }
+
+  private static class Holder {
+    static final String userName = System.getProperty("user.name");
+  }
+
+  /**
+   * Returns the user name as provided by system property 'user.name'.
+   */
+  public static String getUserName() {
+    return Holder.userName;
+  }
+
+  /**
+   * Returns the originating user for this build from the command-line or the environment.
+   */
+  public static String getOriginatingUser(String originatingUser,
+                                          Map<String, String> clientEnv) {
+    if (!Strings.isNullOrEmpty(originatingUser)) {
+      return originatingUser;
+    }
+
+    if (!Strings.isNullOrEmpty(clientEnv.get(ORIGINATING_USER_KEY))) {
+      return clientEnv.get(ORIGINATING_USER_KEY);
+    }
+
+    return UserUtils.getUserName();
+  }
+}