On Fri, Jul 27, 2012 at 9:28 AM, Alexander Hansen <
alexanderk.han...@gmail.com> wrote:
> On 7/27/12 4:55 AM, Martin Costabel wrote:
> > What is the information on which Fink bases this "UIDs above 250 are
> > free" policy?
> >
>
> It comes down from the mists of time. Maybe it was true at one point?
>
> Dustin Cartwright, who did a lot of the work on the code for user
> addition/modification in fink, noted in a thread that this is indeed a
> problem, and that UIDs in the 250-299 range were indeed subject to use
> by Apple. That's why fink-bld now defaults to the 600-699 range, which
> is listed as "open" (at least currently)
Apple does not seem to document its UID policies very transparently. When I
looked the only semi-official policy I could find is that, at least as of
2011, UIDs less than 500 are reserved by Apple, and 500+ are for users and
also for non-Apple daemon accounts:
https://trac.macports.org/ticket/30168#comment:15 and
https://trac.macports.org/ticket/30168#comment:29
I chose to start at 600 just to keep fink's daemon accounts numerically
separate from the normal user accounts, which are assigned to free UIDs
starting from 500. For comparison, Macports just looks for free UIDs
starting from 500.
So that's the rationale for the fink-bld policy. For the UIDs in the passwd
package, I have this vague recollection that in early versions of OS X, the
login screen displayed all users with UID at least 500, so I'd speculate
that 250-299 may have been chosen to keep fink's daemon users from showing
up there.
Dustin
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