[GitHub] [mesos] asekretenko opened a new pull request #326: MESOS-6874: Validate the match between Type and *Infos in the ContainerInfo.

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asekretenko opened a new pull request #326: MESOS-6874: Validate the match between Type and *Infos in the ContainerInfo.
URL: https://github.com/apache/mesos/pull/326
 
 
   To avoid situations like described in [MESOS-6874](https://issues.apache.org/jira/browse/MESOS-6874), I'm clarifying the validity criteria for the `ContainerInfo` protobuf and adding validation of this protobuf into the ComposingContainerizer.
   
   There basically has been three ways to validate this protobuf:
   1. hardcoded check
   2. labelling all the *Infos with protobuf options and use some protobuf reflection
   3. require exact match between the Type enum members and the *Info fields, and use a bit more reflection.
   
   Hardcoded check will not "scale well" in case more container types are added. Protobuf options are not a good option in our case (mesos.proto constututes a part of an external interface and adding an option there would require to register it globally). That's why I opted for the third option.
   
   I'm also adding a test for this validation: passing ContainerInfo with Type==MESOS and docker set should make the ComposingContainerizer fail.
   
   After adding this validation I discovered an invalid ContainerInfo used in the test DefaultExecutorWithDockerImageCommandHealthCheck. This PR contains a fix for this test.
   
   Testing done:
   - run make check after adding the test only: test expectedly fails
   - run make check after adding validation code and fixing the problem with the health check  test: tests pass.

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