[ADD] Launch script: new 'psql' command to enter postgreSQL database

launch.sh

@@ -95,6 +95,7 @@ show_help() {
                      Python dependancies"
   echo -e "   - migrate         Launch migration command:
                      python manage.py migrate"
+  echo -e "   - psql            Enter PSQL database via psql command"
   echo -e "   - restore dump    Restore the given dump"
   echo -e "   - start [arg ...] Launch Gissmo Docker container
                      (created by 'create' command) with a name given
@@ -118,6 +119,8 @@ check_command() {
     return 0
   elif test $1 == "init"; then
     return 0
+  elif test $1 == "psql"; then
+    return 0
   elif test $1 == "migrate"; then
     return 0
   elif test $1 == "restore"; then
@@ -261,6 +264,15 @@ test_restore() {
   DUMP_DIR="${ARGS%/*}"
 }
 
+psql() {
+  test_postgresql_launched
+  if [ $? -eq 1 ]; then
+    $docker_cmd start ${POSTGRES_DOCKER_NAME}
+    sleep 4 # wait postgreSQL database to be fully launched
+  fi
+  $docker_cmd run -it --link ${POSTGRES_DOCKER_NAME}:db --rm postgres sh -c 'exec psql -h "$DB_PORT_5432_TCP_ADDR" -p "$DB_PORT_5432_TCP_PORT" -U postgres' || error_and_quit "Failed to connect to postgreSQL Docker container."
+}
+
 restore() {
   test_create
   test_restore