Re: [fuse-devel] Cannot umount as non-root user anymore

[Miklos S. <mi...@sz...>]

Nikos Chantziaras <re...@gm...> writes:

> On 20/09/12 20:42, Werner Baumann wrote:
>> Am Wed, 19 Sep 2012 21:45:36 +0300
>> schrieb Nikos Chantziaras <re...@gm...>:
>>
>>> A bit of additional data.  It didn't occur to me to also try
>>> fusermount to unmount.  I now did that (with sshfs this time).  The
>>> error message is:
>>>
>>>     $ fusermount -u ./mnt
>>>     fusermount: entry for /home/realnc/mnt not found in /etc/mtab
>>>
>>> However, mtab does have an entry:
>>>
>>>     $ grep "/home/realnc/mnt" /etc/mtab
>>>     foss: /home/realnc/mnt fuse.sshfs rw,nosuid,nodev 0 0
>>>
>> This mtab-entry misses the option 'user=<username>'. The umount
>> programm will only allow an unpriveleged user to unmount when this
>> option is present in the mtab-entry. <username> must be that of the
>> user trying to unmount.
>
> mtab is a automatically generated file.  What system component is 
> responsible for the "user=" option?

Fuse.

More specifically, libfuse will execute fusermount, which will add the
entry to /etc/mtab.  This is the code that does it:


|	if (getuid() != 0) {
|		const char *user = get_user_name();
|		if (user == NULL)
|			return -1;
|
|		if (add_option(mnt_optsp, "user=", strlen(user)) == -1)
|			return -1;
|		strcat(*mnt_optsp, user);
|	}
|

One possibility is that getuid() is now returning zero, but why that
would happen I have no idea.

Thanks,
Miklos



Thanks,
Miklos


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