HBASE-3781 hbase shell cannot start NoMethodError: undefined method 'close' for nil:NilClass

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1094711 13f79535-47bb-0310-9956-ffa450edef68

CHANGES.txt

@@ -76,6 +76,8 @@ Release 0.91.0 - Unreleased
    HBASE-3758  Delete triggers pre/postScannerOpen upcalls of RegionObserver
                (Mingjie Lai via garyh)
    HBASE-3790  Fix NPE in ExecResult.write() with null return value
+   HBASE-3781  hbase shell cannot start "NoMethodError: undefined method
+               `close' for nil:NilClass" (Mikael Sitruk)
 
   IMPROVEMENTS
    HBASE-3290  Max Compaction Size (Nicolas Spiegelberg via Stack)  

src/main/ruby/irb/hirb.rb

@@ -17,8 +17,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
+require 'rbconfig'
 
 module IRB
+  WINDOZE = Config::CONFIG['host_os'] =~ /mswin|mingw/
+  # Map the '/dev/null' according to the runing platform
+  # Under Windows platform the 'dev/null' is not fully compliant with unix,
+  # and the 'NUL' object need to be use instead.
+
   # Subclass of IRB so can intercept methods
   class HIRB < Irb
     def initialize
@@ -31,7 +37,9 @@ module IRB
       # happen is the shell exiting because of failed IRB construction with
       # no error (though we're not blanking STDERR)
       begin
-        f = File.open("/dev/null", "w")
+        devnull = "/dev/null"
+        devnull = "NUL" if WINDOZE 
+        f = File.open(devnull, "w")
         $stdout = f
         super
       ensure