Use Etc.getpwuid() instead of ENV['USER'] for identifying the user.

Changes

@@ -1,10 +1,16 @@
+v1.15.1.beta.2 - 2014/3/13
+
+  Miscellaneous:
+
+  - Use a different workaround for utmp files: getpwuid(3).
+
 v1.15.1.beta.1 - 2014/3/5
 
   Miscellaneous:
 
   - Work around broken utmp files by looking at the LOGNAME and USER
     environment variables to get the current user before falling back on
-    getlogin().
+    getlogin(3).
 
 v1.15.0 - 2014/2/24
 

lib/fig/repository_package_publisher.rb

@@ -92,8 +92,11 @@ def derive_publish_metadata()
   end
 
   def derive_login()
-    return ENV['LOGNAME'] if ENV['LOGNAME']
-    return ENV['USER'] if ENV['USER']
+    # Etc.getpwuid() returns nil on Windows, but Etc.getlogin() will return the
+    # wrong result on some systems if you su(1) to a different user.
+    if password_entry = Etc.getpwuid() and password_entry.name
+      return password_entry.name
+    end
 
     return Etc.getlogin()
   end