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

["Guangya Liu (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MESOS-4576?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Guangya Liu reassigned MESOS-4576:
----------------------------------

    Assignee: Guangya Liu  (was: Disha Singh)

> 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
>            Assignee: Guangya Liu
>              Labels: mesosphere
>
> 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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