[jira] [Created] (MESOS-4576) Introduce a stout helper for "which"

["Joseph Wu (JIRA)" <ji...@apache.org>]

Joseph Wu created MESOS-4576:
--------------------------------

             Summary: Introduce a stout helper for "which"
                 Key: MESOS-4576
                 URL: https://issues.apache.org/jira/browse/MESOS-4576
             Project: Mesos
          Issue Type: Improvement
          Components: stout
            Reporter: Joseph Wu


We may want to add a helper to {{stout/os.hpp}} that will natively emulate the functionality of the Linux utility {{which}}.  i.e.
{code}
Option<string> which(const string& command)
{
  Option<string> path = os::getenv("PATH");

  // Loop through path and return the first one which os::exists(...).

  return None();
}
{code}

This helper may be useful:
* for test filters in {{src/tests/environment.cpp}}
* a few tests in {{src/tests/containerizer/port_mapping_tests.cpp}}
* the {{sha512}} utility in {{src/common/command_utils.cpp}}
* as runtime checks in the {{LogrotateContainerLogger}}
* etc.



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