First cut a new mock launcher

[Clark Williams]

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Clark Williams wrote:
> >>     // elevate our privileges
> >>     if (setreuid (geteuid (), geteuid ()))
> >>         error("setreuid failed: %s", strerror(errno));
> >>     debug("running with uid: %d, gid: %d\n", getuid(), getgid());
> >>
> >> Is this necessary? It seems to me like this is something that can be
> >> done in mock.py for the cases where it is necessary, as mock.py might
> >> need to know the user id of the person running mock, and so it can
> >> switch back to that user for writing output files.
>
> So, you're thinking we just to seteuid/setegid rather than setting the
> real uid/gid?

Ok, I pulled out my shiny new 2nd Edition copy of "Advanced
Programming in the UNIX Environment" to try jog a brain cell or three
about uid/gid manipulation. Now that I reread what you said, it sounds
like you want me just to leave it alone and manipulate effective
uid/gid only when we need to in mock.py.

Is that a correct statement?

Clark
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