On Sat, 12 Sep 2009, Giulio Ferro wrote:
I don't know if this is the correct list to discuss this matter, if not
I apologize in advance.
freebsd-questions might have been better, but I don't think you're too far
off. It wasn't necessary to post three times though :)
[On UFS, files are created with the same group as the directory that
contains them. On ZFS, they are created with the primary group of the
user who creates them.]
What I ask now is: is this a bug or a feature?
Both, I think :)
The behavior you describe on UFS (group comes from the directory) is
standard for BSD-based systems like FreeBSD. On SysV-based systems,
however, the default is that the group comes from the user, as you
describe on ZFS. ZFS was originally developed for Solaris, a descendent
of SysV, so it's not surprising that it also has this behavior. However,
this is at least a documentation bug, since the open(2) man page describes
the BSD behavior without mentioning exceptions.
How can I achieve my goal in ZFS, that is allowing members of the same
group to operate with the files / dirs they create?
On SysV, you can get BSD-type behavior by setting the sgid bit on the
directory in question, e.g. "chmod g+s dir". Then new files will inherit
their group from the directory. I suspect this will work on FreeBSD/ZFS
too even though "chmod g+s" on a directory is undocumented.
--
Nate Eldredge
n...@thatsmathematics.com
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