enable environment variables to be passed in via command line. handy for integrating into CI.

Author: lassewesth

run.sh

@@ -1,6 +1,13 @@
 #!/bin/bash
-HADOOP_HOME=/home/user/hadoop-1.2.1 #change to your hadoop folder
-LDBC_SNB_DATAGEN_HOME=/home/user/ldbc_snb_datagen #change to your ldbc_socialnet_dbgen folder 
+DEFAULT_HADOOP_HOME=/home/user/hadoop-1.2.1 #change to your hadoop folder
+DEFAULT_LDBC_SNB_DATAGEN_HOME=/home/user/ldbc_snb_datagen #change to your ldbc_socialnet_dbgen folder
+
+# allow overriding configuration from outside via environment variables
+# i.e. you can do
+#     HADOOP_HOME=/foo/bar LDBC_SNB_DATAGEN_HOME=/baz/quux ./run.sh
+# instead of changing the contents of this file
+HADOOP_HOME=${HADOOP_HOME:-$DEFAULT_HADOOP_HOME}
+LDBC_SNB_DATAGEN_HOME=${LDBC_SNB_DATAGEN_HOME:-$DEFAULT_LDBC_SNB_DATAGEN_HOME}
 
 export HADOOP_HOME
 export LDBC_SNB_DATAGEN_HOME
@@ -11,7 +18,7 @@ mvn assembly:assembly
 cp $LDBC_SNB_DATAGEN_HOME/target/ldbc_socialnet_dbgen.jar $LDBC_SNB_DATAGEN_HOME/
 rm $LDBC_SNB_DATAGEN_HOME/target/ldbc_socialnet_dbgen.jar
 
-$HADOOP_HOME/bin/hadoop  jar $LDBC_SNB_DATAGEN_HOME/ldbc_socialnet_dbgen.jar $LDBC_SNB_DATAGEN_HOME/params.ini 
+$HADOOP_HOME/bin/hadoop  jar $LDBC_SNB_DATAGEN_HOME/ldbc_socialnet_dbgen.jar $LDBC_SNB_DATAGEN_HOME/params.ini
 
 #parameter generation
 PARAM_GENERATION=1