Date: Tue, 31 Jan 2006 11:53:42 +0200 From: Giorgos Keramidas <keramida@ceid.upatras.gr> To: Duane <duane@greenmeadow.ca> Cc: freebsd-questions@freebsd.org Subject: Re: I'm stubborn or stupid (and that's not xor) (Was: CVS Import Permissions) Message-ID: <20060131095342.GB2042@flame.pc> In-Reply-To: <43DEB306.3070903@greenmeadow.ca> References: <1138676399.30955.253148220@webmail.messagingengine.com> <43DEB306.3070903@greenmeadow.ca>
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On 2006-01-31 00:44, Duane <duane@greenmeadow.ca> wrote:
> Hi everyone,
>
> On the CVS server machine should our CVS repository directory belong to
> the cvs group, i.e. user==root, group==cvs?
It's usually a good idea.
> And as for the umask, as it appears to be 027, if we give the
> cvs group write permission on /usr/local/cvsrep then when we
> import our projects they will be writeable by members of group
> cvs and the owner of the project, in this case jim.
No. This is not how `umask' works. Whatever value `umask'
currently has is logically-AND-ed with 0666. This means that by
using 027, the result is:
$ python
>>> print "%04o" % (066 & 027)
0026
These are the bits that will be turned *off* for new files (see
the umask(2) manpage for details), so to find out which
permission bits are allowed, you have to use the reverse mask:
>>> print "%04o" % (0777 & ~(066 & 027))
0751
The 0751 allowed-bits mask is equivalent to:
rwxr-x--x
This means that with a umask of 027, you are effectivelly
allowing only the bits in ``rwxr-x--x'' to be turned on by
default for new files, and this doesn't include write permission
for the group.
I know that the whole `umask' concept is a bit tricky to grasp,
since it depends on knowledge of numbering with an octal-base
*AND* it works in the reverse order of that people usually think
it does, but hopefully, with the help of our excellent manpages
and a bit of experimentation, it will become more obvious :)
> I apologize if I am being all the things suggested in my
> subject heading.
Nah! Never apologize for a question. There is no such thing as
a stupid question for this list (well, unless the question refers
to Windows, of course :P).
- Giorgos
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