HBASE-24550 Passing '-h' or '--help' to bin/hbase doesn't do as expected

Closes #1930

Signed-off-by: Viraj Jasani <vjasani@apache.org>

bin/hbase

@@ -57,28 +57,15 @@
 bin=`dirname "$0"`
 bin=`cd "$bin">/dev/null; pwd`
 
-# This will set HBASE_HOME, etc.
-. "$bin"/hbase-config.sh
-
-cygwin=false
-case "`uname`" in
-CYGWIN*) cygwin=true;;
-esac
-
-# Detect if we are in hbase sources dir
-in_dev_env=false
-if [ -d "${HBASE_HOME}/target" ]; then
-  in_dev_env=true
-fi
-
 read -d '' options_string << EOF
 Options:
   --config DIR     Configuration direction to use. Default: ./conf
   --hosts HOSTS    Override the list in 'regionservers' file
   --auth-as-server Authenticate to ZooKeeper using servers configuration
+  --help or -h     Print this help message
 EOF
-# if no args specified, show usage
-if [ $# = 0 ]; then
+
+show_usage() {
   echo "Usage: hbase [<options>] <command> [<args>]"
   echo "$options_string"
   echo ""
@@ -108,6 +95,31 @@ if [ $# = 0 ]; then
   echo "  hbtop            Run the HBTop tool"
   echo "  version          Print the version"
   echo "  CLASSNAME        Run the class named CLASSNAME"
+}
+
+if [ "--help" = "$1" ] || [ "-h" = "$1" ]; then
+  show_usage
+  exit 0
+fi
+
+# This will set HBASE_HOME, etc.
+. "$bin"/hbase-config.sh
+
+cygwin=false
+case "`uname`" in
+CYGWIN*) cygwin=true;;
+esac
+
+# Detect if we are in hbase sources dir
+in_dev_env=false
+if [ -d "${HBASE_HOME}/target" ]; then
+  in_dev_env=true
+fi
+
+
+# if no args specified, show usage
+if [ $# = 0 ]; then
+  show_usage
   exit 1
 fi
 

bin/hbase-config.cmd

@@ -33,6 +33,14 @@ if "%1" == "--config" (
   shift
   shift
 )
+if "%1" == "--help" (
+  echo Error usage! You should use it like 'hbase --help' or 'hbase -h';
+  exit /B 2
+)
+if "%1" == "-h" (
+  echo Error usage! You should use it like 'hbase --help' or 'hbase -h';
+  exit /B 2
+)
 
 @rem the root of the hbase installation
 if not defined HBASE_HOME (

bin/hbase-config.sh

@@ -84,6 +84,10 @@ do
       exit 1
     fi
     shift
+  elif [ "--help" = "$1" ] || [ "-h" = "$1" ]
+  then
+    echo "Error usage! You should use it like 'hbase --help' or 'hbase -h'";
+    exit 1
   else
     # Presume we are at end of options and break
     break

bin/hbase.cmd

@@ -59,6 +59,15 @@ if "%HBASE_BIN_PATH:~-1%" == "\" (
   set HBASE_BIN_PATH=%HBASE_BIN_PATH:~0,-1%
 )
 
+if "%1" == "--help" (
+  goto :print_usage
+  exit /B 0
+)
+if "%1" == "-h" (
+  goto :print_usage
+  exit /B 0
+)
+
 rem This will set HBASE_HOME, etc.
 set hbase-config-script=%HBASE_BIN_PATH%\hbase-config.cmd
 call "%hbase-config-script%" %*