Ok the man-page is not clear enough :-)
----- Forwarded message from Karel Zak <k...@redhat.com> -----
Date: Mon, 15 Jun 2009 17:10:31 +0200
From: Karel Zak <k...@redhat.com>
To: Joerg Friedrich <joerg.friedr...@friedrich-kn.de>
Cc: util-linux...@vger.kernel.org, sub...@bugs.debian.org,
Miklos Szeredi <mik...@szeredi.hu>,
Kay Sievers <kay.siev...@vrfy.org>
Subject: Re: umount: discrepancy between manpage and program
List-ID: <util-linux-ng.vger.kernel.org>
On Mon, Jun 15, 2009 at 03:45:06PM +0200, Joerg Friedrich wrote:
> Package: mount
> Version: 2.15.1~rc1-1
> Severity: normal
>
> Hi!
>
> The umount-manpage states:
>
> NOTES
> The syntax of external umount helpers is:
>
> /sbin/umount.<suffix> [-nlfvr] dir | device
>
> where the <suffix> is filesystem type or a value from "uhelper=" mtab
> option.
>
> The uhelper (unprivileged umount helper) is possible to used when
Ah, should be:
The "uhelper=" mtab option is possible to used when ...
> non-root user wants to umount a mountpoint which is not defined in the
> /etc/fstab file (e.g devices mounted by HAL).
>
> But the uhelper is only called when the uhelper= option is present and
> not based on filesystem type. A feature which would be really great
mount(8) calls /sbin/umount.<suffix>, see check_special_umountprog()
in umount_one().
The uhelper= is only for unprivileged users when there is not a
proper entry in the /etc/fstab file. This is typical for removable
media which was mounted by HAL.
> because I could umount usermounted filesytems like ltspfs (www.ltsp.org,
> fuse based) with umount.
You need to add "user" option to your /etc/fstab.
> I tried a quick hack (works for me), but I'm not sure about the correctness
> :-)
Well, I'd like kill all current userspace specific mount options and
then remove /etc/mtab from Linux. We need to maintain all information
about mounted devices in /proc/self/mountinfo only. The /etc/mtab is
horrible legacy...
My dream is a generic mount(2) option string (e.g. "usernote=<string>")
that will be ignored by Linux kernel, but always presented in
/proc/self/mountinfo. This option we can use for userspace specific
information rather than mtab.
Miklos, any comment?
Karel
>
> if (mc->m.mnt_opts)
> uhelper = get_value(mc->m.mnt_opts,
> "uhelper=");
> + if (!uhelper)
> + uhelper = mc->m.mnt_type;
> if (uhelper) {
> int status = 0;
> if (check_special_umountprog(arg, arg,
>
>
> --
> Jörg Friedrich
>
> There are only 10 types of people:
> Those who understand binary and those who don't.
--
Karel Zak <k...@redhat.com>
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----- End forwarded message -----
--
Jörg Friedrich
There are only 10 types of people:
Those who understand binary and those who don't.
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