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https://reviews.apache.org/r/45888/#review127915
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Fix it, then Ship it!





3rdparty/libprocess/3rdparty/stout/include/stout/windows/os.hpp (lines 56 - 68)
<https://reviews.apache.org/r/45888/#comment191290>

    How about:
    
    ```
      // Do not set the variable if already set and `overwrite` was not specified.
      //
      // Per MSDN[1], `GetEnvironmentVariable` returns 0 on error and sets the
      // error code to `ERROR_ENVVAR_NOT_FOUND` if the variable was not found.
      //
      // [1] https://msdn.microsoft.com/en-us/library/windows/desktop/ms683188(v=vs.85).aspx
      if (!overwrite &&
          ::GetEnvironmentVariable(key.c_str(), NULL, 0) != 0 &&
          ::GetLastError() == ERROR_ENVVAR_NOT_FOUND) {
        return;
      }
    ```


- Michael Park


On April 7, 2016, 7:31 p.m., Alex Clemmer wrote:
> 
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> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/45888/
> -----------------------------------------------------------
> 
> (Updated April 7, 2016, 7:31 p.m.)
> 
> 
> Review request for mesos, Alex Naparu, Daniel Pravat, Artem Harutyunyan, Joris Van Remoortere, Michael Park, M Lawindi, and Yi Sun.
> 
> 
> Repository: mesos
> 
> 
> Description
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> Stout: Implemented `os::setenv` on Windows.
> 
> 
> Diffs
> -----
> 
>   3rdparty/libprocess/3rdparty/stout/include/stout/windows/os.hpp 6a391ff198ab724f689bcef79d4e2e05a786cbc2 
> 
> Diff: https://reviews.apache.org/r/45888/diff/
> 
> 
> Testing
> -------
> 
> 
> Thanks,
> 
> Alex Clemmer
> 
>