refactor(ci): improve database wait script (#12132)

.travis.yml

@@ -27,12 +27,13 @@ env:
 
 before_script:
   # setup docker
-  - "if [ $MARIADB_VER ]; then export MARIADB_ENTRYPOINT=$TRAVIS_BUILD_DIR/test/config/mariadb; fi"
-  - "if [ $MYSQL_VER ]; then export MYSQLDB_ENTRYPOINT=$TRAVIS_BUILD_DIR/test/config/mysql; fi"
-  - "if [ $POSTGRES_VER ] || [ $MARIADB_VER ] || [ $MYSQL_VER ]; then docker-compose up -d ${POSTGRES_VER} ${MARIADB_VER} ${MYSQL_VER}; fi"
-  - "if [ $MARIADB_VER ]; then docker run --link ${MARIADB_VER}:db -e CHECK_PORT=3306 -e CHECK_HOST=db --net sequelize_default giorgos/takis; fi"
-  - "if [ $MYSQL_VER ]; then docker run --link ${MYSQL_VER}:db -e CHECK_PORT=3306 -e CHECK_HOST=db --net sequelize_default giorgos/takis; fi"
-  - "if [ $POSTGRES_VER ]; then docker run --link ${POSTGRES_VER}:db -e CHECK_PORT=5432 -e CHECK_HOST=db --net sequelize_default giorgos/takis; fi"
+  - if [ $MARIADB_VER ]; then export MARIADB_ENTRYPOINT=$TRAVIS_BUILD_DIR/test/config/mariadb; fi
+  - if [ $MYSQL_VER ]; then export MYSQLDB_ENTRYPOINT=$TRAVIS_BUILD_DIR/test/config/mysql; fi
+  - if [ $POSTGRES_VER ] || [ $MARIADB_VER ] || [ $MYSQL_VER ]; then docker-compose up -d ${POSTGRES_VER} ${MARIADB_VER} ${MYSQL_VER}; fi
+  - wait_for() { docker run --net sequelize_default jwilder/dockerize -timeout 2m -wait "$1"; }
+  - if [ $POSTGRES_VER ]; then wait_for tcp://${POSTGRES_VER}:5432; fi
+  - if [ $MARIADB_VER ]; then wait_for tcp://${MARIADB_VER}:3306; fi
+  - if [ $MYSQL_VER ]; then wait_for tcp://${MYSQL_VER}:3306; fi
 
 script:
   - |-