Added modules

modules/postgresql/files/validate_postgresql_connection.sh

@@ -0,0 +1,31 @@
+#!/usr/bin/env bash
+
+# usage is: validate_db_connection 2 50 psql
+
+SLEEP=$1
+TRIES=$2
+PSQL=$3
+
+STATE=1
+
+for (( c=1; c<=$TRIES; c++ ))
+do
+  echo $c
+  if [ $c -gt 1 ]
+  then
+    echo 'sleeping'
+    sleep $SLEEP
+  fi
+
+  /bin/echo "SELECT 1" | $PSQL
+  STATE=$?
+
+  if [ $STATE -eq 0 ]
+  then
+    exit 0
+  fi
+done
+
+echo 'Unable to connect to postgresql'
+
+exit 1