https://github.com/ApolloAuto/apollo/issues/181
1、If using dev docker env, you need run apollo.sh build once to pull ros dependency. logout from docker and docker/scripts/dev_into.sh again. It will setup the ROS env for you.
2、do you logout from docker after apollo.sh build? No need to setup apollo-platform. apollo.sh automatically pulls the dependency.
3、type exit and press enter inside docker terminal
4、Does apollo.sh build work for you? If so, you can check if the ros dependency exists by ls -l /apollo/bazel-apollo/external/ros/setup.bash
5、It indicates your env has downloaded ros dependency. manually source /apollo/bazel-apollo/external/ros/setup.bash and rosbag should work for you. Generally, dev_into.sh will source ros setup.bash for you.