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https://reviews.apache.org/r/46822/
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Review request for mesos, Alexander Rukletsov and Vinod Kone.


Bugs: MESOS-3335
    https://issues.apache.org/jira/browse/MESOS-3335


Repository: mesos


Description
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While `FlagsBase` internally stores just maps of names and
flags, the functions stored in a `Flag` rely on the original type of
the `Flags` containing them (e.g., we perform dynamic casts to detect
their types).

Since `Option<T>` stores `T` as a value (i.e., it cannot contain
reference types) any interface taking an `Option<T>` cannot rely on
polymorphic behavior of `T`. To make use of polymorphism we should
instead store e.g., a pointer type to avoid slicing.

Here we change `Flags` arguments of `subprocess` to allow preserving
the original type so `Flag` function can work reliably.


Diffs
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  src/slave/container_loggers/lib_logrotate.cpp 
1f228806da32832c9ca1ae4defcd1bdc154adc18 
  src/slave/containerizer/docker.cpp 7af14f4472283ceefd73c06dd8df60af4cf6f7e8 
  src/slave/containerizer/mesos/containerizer.cpp 
8d538954d6e1f13e833d75c2eaa37e700278ee0c 
  src/slave/containerizer/mesos/isolators/network/cni/cni.cpp 
ef0bc1092d761804ca6bd73016c0f3dd23719257 
  src/slave/containerizer/mesos/launcher.hpp 
5977c30c0aacc569019f7b34bb0c6577823ec887 
  src/slave/containerizer/mesos/launcher.cpp 
a5c8c31b72773d0bd10b9d02675a01f1d641d41c 
  src/slave/containerizer/mesos/linux_launcher.hpp 
89bb2958a41dffe4ade9c2492b9a7412f90a432d 
  src/slave/containerizer/mesos/linux_launcher.cpp 
5028854fa003615f158120e030866b7ec4402b66 
  src/tests/containerizer/launch_tests.cpp 
3e36f2f7ab89b98de2c1a971e4ecca58c13ad642 
  src/tests/containerizer/launcher.hpp c352634c4766d289706c7cc738677619d7d02ccd 

Diff: https://reviews.apache.org/r/46822/diff/


Testing
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Tested on various platforms in internal CI.


Thanks,

Benjamin Bannier

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