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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