Hi Jean-Pierre,
On Mon, 17 Sep 2007, [ISO-8859-1] Jean-Pierre André wrote:
> Szabolcs Szakacsits wrote:
> >
> > Fantastic! :-) Would it be posible to port the tool to Linux? It would
> > be highly valuable because people often don't have or want to use
> > Windows (portable external disks, disk images) but they would still
> > like to have some sort of user mapping.
> >
> The main problem for porting the mapping tool to Linux is to
> return the vol-id ("ctx->vol") to calling program, so that it
> could then call entries in ntfs.so similar to GetFileSecurity()
> and SetFileSecurity() from Win32, and bypassing fuse. I thought
> of returning the vol-id in parameter f_fsid of statfs(). There
> could be a second problem if vol-id points to data in an address
> space private to ntfs-3g process and not usable in other
> processes. If this should be confirmed, fuse cannot be bypassed.
You could make a separate utility using libntfs-3g. The ntfs-3g driver
is also a utility using libntfs-3g.
> Getting Windows names is easy if system partition is mounted by
> ntfs-3g : just read entries in "Documents and Settings". This is
> basically what the tool I have developed does.
I suspect it should be stored somewhere else too (e.g. gids,
non-interactive users, etc). But I also guess it's on the system
partition somewhere (registry?).
> Supplying Linux names instead of uid and gid only implies
> reading /etc/passwd and /etc/groups at mount time, with one
> implementation if these files are over ntfs-3g, and a second
> implementation if they are not (expecting them to have been
> mounted).
getpwuid(uid) and getgrgid(gid) can help here. The former is used in
set_user_mount_option() in ntfs-3g.c
Please also leave the $UserMapping file in the root directory and drop the
$ because it typically causes problems for users, scripts, etc. The name
'UserMapping' still seems a bit too general and candinate for collision
with something else in the future. Maybe UserMapping.NTFS-3G? Or
NTFS-3G.UserMapping? Or NTFS-3G/UserMapping and the NTFS-3G directory being
hidden, still read and writeable by backup tools? Probably the last one is
the best for the long term. What do you think?
Thanks,
Szaka
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