[PLUG] Reality collides with Linux worldview

[Richard Owlett]

On 04/12/2017 01:51 PM, Larry Brigman wrote:
> Maybe with automount and udev rules it could get set automatically.

traduzey en anglais s'il vous plait



>
> On Apr 12, 2017 8:39 AM, "Richard Owlett" <rowlett at cloud85.net> wrote:
>
>> On 04/11/2017 01:13 PM, Richard Owlett wrote:
>>> On 04/11/2017 12:30 PM, Paul Mullen wrote:
>>>> On Tue, Apr 11, 2017 at 11:02:37AM -0500, Richard Owlett wrote:
>>>>> Can fstab cause the partition's owner to 'universal' of group
>> 'universe'?
>>>>> NOTE BENE: spelling of 'universal'/'universe' intentional.
>>>>>
>>>>> The intention being that *all* users would *AUTOmagically* be members
>> of
>>>>> group 'universe'. Would require attention to creating same gid
>>>>> automatically.
>>>>
>>>> FAT-based file systems have no concept of file ownership.  The Linux
>>>> msdos and vfat file systems provide the ability to set static values
>>>> for user, group, and permissions, though.  The "umask" option in your
>>>> fstab entry is one of them.
>>>>
>>>> You can specify the owning user and group by adding the "uid" and
>>>> "gid" options.  If left unset, they default to the user that mounts
>>>> the partition (root, in your case).  Note that the value assigned to
>>>> these options are the user's and group's numeric identifiers, not
>>>> their names (e.g., "uid=1000").
>>>>
>>>> You can also specify permission mode masks separately for files and
>>>> directories, which will eliminate your difficulty with file creation
>>>> and deletion.  (A user must have execute permission for a directory
>>>> before he can add to or delete from it.)  Adding "dmask=022"
>>>> (resulting in a directory mode of 0755) and "umask=133" (resulting in
>>>> a file mode of 0644) should suffice.
>>>>
>>>> So try changing your fstab entry to this:
>>>>
>>>>   UUID=E90C-65B4  /media/common vfat auto,exec,rw,flush,uid=YOUR_
>> UID_HERE,gid=YOUR_GID_HERE,dmask=022,fmask=133  0 0
>>
>> Based on the man page for mount saying:
>>
>> uid=value and gid=value
>>      Set the owner and group of all files. (Default: the uid and gid of
>> the current process.)
>>
>> I experimentally deleted "uid=YOUR_UID_HERE,gid=YOUR_GID_HERE,".
>> I got something closer to my mental image of how things should work.
>> It required the partition be manually mounted.
>> That resulted with the existing files on the partition being "owned" by
>> the user triggering the mount - a near ideal situation.
>> HOWEVER :<
>> I managed to lose that configuration - I THOUGHT I'd saved all my
>> iterations.
>> I'll try again tomorrow morning. Right now I've got myself going in
>> non-productive circles.
>>
>>
>>>
>>> That worked.
>>> It raised some questions that I'll have to experiment with.
>>> Can't just now as I'm leaving for an appointment.
>>>
>>>>
>>>> It's probably safe to remove the "exec" and "flush" options, unless
>>>> you have specific reasons to include them.
>>>
>>> I don't recall why I included exec.
>>> However flush was explicitly recommended in a "HOWTO" I saw somewhere.
>>> It specifically aimed at uses with vfat.
>>>
>>>>  The mount manpage has all
>>>> of the details on the various options.  Search for "Mount options for
>>>> fat" and "Mount options for vfat".
>>>>
>>>>
>>>
>>> More later.
>>> Thanks.
>>>
>>
>>
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