From da786bd2529e27c15c593512b0ea3792647f3f78 Mon Sep 17 00:00:00 2001
From: Jakob Homan <jghoman@gmail.com>
Date: Wed, 2 Feb 2011 15:17:31 -0800
Subject: [PATCH] Improve the howl.sh to have Apache license, remove un-used
 variable, and check for the definition of required environmental variables.

---
 howl/howl.sh | 38 ++++++++++++++++++++++++++++++++------
 1 file changed, 32 insertions(+), 6 deletions(-)

diff --git a/howl/howl.sh b/howl/howl.sh
index 374fc7b3..4f122c4d 100755
--- a/howl/howl.sh
+++ b/howl/howl.sh
@@ -1,18 +1,44 @@
 #!/usr/bin/env bash
 
-HOWL_DIR=`dirname "$0"`
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You 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.
 
 HOWL_JAR_LOC=`find . -name "howl*.jar"`
 
-HADOOP_CLASSPATH=$HADOOP_CLASSPATH:${HOWL_JAR_LOC}:../lib/commons-cli-2.0-SNAPSHOT.jar:../build/cli/hive-cli-0.7.0.jar:../ql/lib/antlr-runtime-3.0.1.jar
+if [ "$HOWL_JAR_LOC" == "" ]
+then
+  echo "Unable to find Howl jar. Exiting."
+  exit 1
+fi
 
-export HADOOP_CLASSPATH=$HADOOP_CLASSPATH
+if [ ! "$HADOOP_HOME" ]
+then
+  echo "HADOOP_HOME is not defined.  Exiting."
+  exit 1
+fi
 
-for f in `ls ../build/dist/lib/*.jar`; do 
-  HADOOP_CLASSPATH=$HADOOP_CLASSPATH:$f 
+
+HADOOP_CLASSPATH=$HADOOP_CLASSPATH:${HOWL_JAR_LOC}:../lib/commons-cli-2.0-SNAPSHOT.jar:../build/cli/hive-cli-0.7.0.jar:../ql/lib/antlr-runtime-3.0.1.jar
+
+for f in `ls ../build/dist/lib/*.jar`; do
+  HADOOP_CLASSPATH=$HADOOP_CLASSPATH:$f
 done
 
-HADOOP_OPTS="$HADOOP_OPTS -Dhive.metastore.uris=thrift://localhost:9083 " 
+export HADOOP_CLASSPATH=$HADOOP_CLASSPATH
+
+HADOOP_OPTS="$HADOOP_OPTS -Dhive.metastore.uris=thrift://localhost:9083 "
 
 export HADOOP_OPTS=$HADOOP_OPTS