Re: Permission issue

[Richard Owlett <rowlett@cloud85.net>]

Bob Proulx wrote:
> Siard wrote:
> > Richard Owlett wrote:
> > > My dual boots Squeeze and Wheezy.
> > > I've created a partition whose function in life is to be
> > > essentially a scratch pad for all groups/users of both.
> > > How do I force all files to be written to that partition to be
> > > readable AND writable to everybody?
> >
> > By putting a line like this one in both /etc/fstab's:
> >
> > /dev/sdb3   /data   ext3   rw,user,exec
>
> I don't think it will do what you want it to do.  The user flag allows
> a *user* to mount the filesystem.  Otherwise superuser is required.
> Usually the "user" flag is coupled with the "noauto" flag.  The noauto
> flag prevents it from automatic mounting at boot time.  That way
> something isn't mounted at boot time but any user may mount it later.
> And importantly when the user mounts it later the user:group is mapped
> to the user's user:group ids.  Here is a typical use entry of it.
>
>    /dev/cdrom      /media/cdrom0   udf,iso9660 user,noauto     0 0
>
> I didn't try this with a full disk writable file system because I
> don't have time to run the experiment.

I've the time and a machine dedicated to experiments which could 
have strange side-effects.
As I've said elsewhere, someone has pointed out that a FAT 
filesystem should meet my "real world" needs. I'll pursue it as I 
"learn by doing". That's why I purchase a used laptop as a 
learning environment. In any month the hard drive may be purged a 
dozen times ;)


>   But I believe that without the
> noauto flag that it will be mounted at boot time automatically.  The
> user in that case will be root.  Therefore the "user" flag will set
> the user:group of all files to root:root.  That is why the files are
> showing up with lock icons.  They are writable only by the root user.
>
> Therefore using the "user" flag here just doesn't seem like the thing
> you want to do to accomplish what you want.
>
> Bob