Optional database prepare

In some cases nailgun database could already exist
and ready for use. In this case we don't need
to do anything when preparing database.

Change-Id: I865eefd44af0dd1062f27b789d60515d55d7b4d2

nailgun/tools/env.sh

@@ -25,14 +25,22 @@ case $1 in
         cleanup_nailgun_env
         ;;
     prepare_nailgun_database)
-        prepare_pgpass
-        prepare_database_role
-        prepare_database
+        if [[ "${NAILGUN_DB_PREPARE}" == "yes" ]]; then
+            prepare_pgpass
+            prepare_database_role
+            prepare_database
+        else
+            echo "Preparing database has been skipped due to NAILGUN_DB_PREPARE=${NAILGUN_DB_PREPARE}"
+        fi
         ;;
     cleanup_nailgun_database)
-        prepare_pgpass
-        cleanup_database
-        cleanup_pgpass
+        if [[ "${NAILGUN_DB_PREPARE}" == "yes" ]]; then
+            prepare_pgpass
+            cleanup_database
+            cleanup_pgpass
+        else
+            echo "Cleaning up database has been skipped due to NAILGUN_DB_PREPARE=${NAILGUN_DB_PREPARE}"
+        fi
         ;;
     cleanup_nailgun_server)
         cleanup_server

nailgun/tools/env_functions.sh

@@ -66,6 +66,7 @@ EOL
 }
 
 prepare_server() {
+    python ${NAILGUN_ROOT}/manage.py dropdb > /dev/null
     python ${NAILGUN_ROOT}/manage.py syncdb > /dev/null
     python ${NAILGUN_ROOT}/manage.py loaddefault > /dev/null
     if test -n "$NAILGUN_FIXTURE_FILES"; then

tox.ini

@@ -15,6 +15,7 @@ setenv =
          DB_ROOTPW={env:DB_ROOTPW:insecure_slave}
          DB_ROOTPGPASS={[base]ARTS}/pgpass
 
+         NAILGUN_DB_PREPARE={env:NAILGUN_DB_PREPARE:yes}
          NAILGUN_DB={env:NAILGUN_DB:openstack_citest}
          NAILGUN_DB_HOST={env:NAILGUN_DB_HOST:127.0.0.1}
          NAILGUN_DB_PORT={env:NAILGUN_DB_PORT:5432}