On Thu, 17 Mar 2016 18:38:56 -0400, Rich Freeman wrote: > > umask is just not viable either, as a) it's global and affects all > > files a user creates and b) by definition umask is modifiable by the > > user (it's a feature to help users out so they don't need to chmod > > every file every time) and c) you can't stop them doing it (by > > design). > > Actually, this is completely viable. Just set the default umasks to > 007, and create a new group for each user as their default group (and > don't have all their home directories be owned by some users group). > This is how this sort of situation was handled long before POSIX ACLs > became common, and I know that some distros behave this way by default > for this reason (this was the case in the distro I used right before I > switched to Gentoo). > > If users chmod a file then tell them not to. If you must, set up some > cron job to clean up after them. > > But, you can of course do this with ACLs as well. I haven't tried > setting those up personally.
I've done this with ACLs in the past, which is why I suggested it, but it's a pain to set up if you haven't used them before. Alan's suggestion of using inotify is probably simplest. Install incrond and put something like this in a file in /etc/incron.d /shared/dir IN_CREATE,IN_MODIFY chmod g+w $# -- Neil Bothwick Windows Error #56: Operator fell asleep while waiting.
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