Application.setUID and setEUID not portable.

[radix]

These methods fail on HP-UX11i because os.getgid()
returns 3, not zero.

[glyph]

returns 3 for root, I assume you mean

[rptownsend]

Yes, I posted this to the Twisted-Python mailing list:

# id
uid=0(root) gid=3(sys)
groups=0(root),1(other),2(bin),4(adm),5(daemon),6(mail),7
(lp),20(users)

# /opt/python/bin/python          
Python 2.2.1 (#5, Jan 23 2003, 13:18:26) [C] on hp-ux11
Type "help", "copyright", "credits" or "license" for more 
information.
>>> import os
>>> os.getgid()
3

A patch was posted by Martin Armstrong.

Andrew Bennets replied:
"This looks sensible to me.  Would anyone object if I 
checked it in?"

Since then, nothing...

[radix]

I don't understand how the attached patch is relevant; it
catches more errors, but doesn't seem to do anything about
the fact that on HP/UX root is uid 3. I probably don't
understand the problem enough, can you explain more?

[rptownsend]

It's root's *gid* that is set to 3, not it's *uid*.

This means that 'if not os.getgid()' will always return 
False, thus setUID() and setEUID() will have no effect.

My patch doesn't call os.getgid(), it just tries to call 
the appropriate set functions and ignores any exceptions if 
the calls fail.

[radix]

Ah, right, since the code wasn't checking against `0'
explicitly, I was confused. I'll commit your patch.

[radix]

buildbot's green