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[perl #116775] Broken test t/op/groups.t

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James E Keenan via RT
July 13, 2013 01:25
[perl #116775] Broken test t/op/groups.t
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On Sun Feb 17 15:42:59 2013, jbenjore wrote:
> On Sat Feb 16 16:51:18 2013, demerphq wrote:
> > Josh are you able to look into this? As far as I know the last patch
> > was from you and was quite significant.
> > 
> > Cheers,
> > Yves
> Yves,
> The root of the original Darwin problem was that Darwin has NGROUPS_MAX 
> at 15 which means that the kernel allocates only enough storage for 
> membership in that many groups. By default I recall, something like 12 
> of them are used by default.
> Any LDAP groups or similar must fit within the additional 3 groups for 
> membership. I vaguely recall that that the $) uses an API which directly 
> interrogates the kernel and the allocated group membership which means 
> Perl conforms to the built-in limit of only 15 groups maximum. The 
> comments in t/op/groups.t say it's the kernel function getgroups(2).
> The `id` and/or `groups` commands however are not limited by the local 
> machine and report all group memberships, even those that aren't 
> representable on the local machine. The intent of 
> 651d4685ebdde5512841551572b29e74605bfc38 if I recall correctly, is to 
> attempt to test the numeric ids returns from `id` against the numeric 
> ids returned by $( except when we find more ids than possible.
> It is possible that on Darwin perl's $( should call the libc function 
> getgrouplist(3) *instead* of getgroups(2). The libc function consults 
> Open Directory and is not limited by the kernel's NGROUPS_MAX 
> allocation.
> Further, it is just a rank stupid bug that this code can run and omit at 
> least a "not ok 1". Apologies for 
> 605bfc38:/t/op/groups.t#l120 which clearly allows for a missing "not ok 
> 1".

Josh, Yves:  Do we have any more insight into this problem?

Thank you very much.
Jim Keenan

via perlbug:  queue: perl5 status: open

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