why is (gid_t)-1 treated as a group mapping failure?

[Gerald (Jerry) Carter]

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James Peach wrote:
> Hi all,
> 
> There's a bunch of code sprinkled throughout the 
> passdb layer(s) that asserts that -1 cannot be a valid
> ID.

It's a hack to allow the nss_info layer to return
a primary group id and override the Windows primary
group (e.g gidNumber attribute in posixAccount for RFC2307).

- -1 seemed a better choice than 0.


cheers, jerry
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