giovedì 7 agosto 2008

Definiamo il Mount-Point di una periferica di archiviazione con file system VFAT


Avendo una PSP slim & lite, che sulla mia UbuntuBox viene gestita dall'ottimo software QPSPManager, per gestire salvataggi, convertire video, trasferire file...ecc, ho avuto l'esigenza di dover dare alla mia PSP un mount-point statico, e non che variasse di volta in volta (tipo /media/disk......./media/disk-1.......). Prima ho tentato di modificare il mount-point cliccando col tasto destro sull'icona del dispositivo e modificando le impostazioni di mount dalla scheda "Volume" delle Proprietà....ma questo NON FATELO, perchè non vi permetterà più di montare la periferica....infatti vi darà un errore del tipo:

Impossibile montare il volume
Dettagli: mount_point cannot contain the following characters: newline, G_DIR_SEPARATOR (usually /)

Se incappate in questo errore...risolverlo è semplice:
Da terminale date:

gconf-editor

e andate nella scheda System --> Storage --> Volume ed eliminate le chiavi relative alla periferica che non viene montata.

Vediamo ora come invece modificare permanentemente un mount-point:
Installiamo prima di tutto un insieme di tool utili:

sudo apt-get install mtools

Poi con il comando

sudo fdisk -l

verifichiamo il nome del device, es /dev/sdc1
Controlliamo che il device non ha nessuna label con il comando:

sudo mlabel -i /dev/sdc1 -s ::

Se non vi è etichetta a quel device ci verrà riproposto:

Volume has no label

Diamo allora il comando

sudo mlabel -i /dev/sdc1 ::MioDisco

per etichettare il device con il nome "MioDisco".

A questo punto dobbiamo dare i permessi per poter scrivere e cancellare i file:

sudo chown -R *utente:*gruppo /media/MioDisco

dove al posto di *utente e *gruppo inseriamo rispettivamente il nome utente e del gruppo, che nel caso si sia amministratori coincidono.
Possiamo però impostare i permessi in modo più flessibile, assegnando ad un determinato gruppo la possibilità di modificare i file del nuovo disco. Il gruppo è plugdev, a cui appartengono gli utenti abilitati al montaggio di dischi rimovibili. Diamo questi comandi:

Assegnamo la directory dove montiamo il disco al gruppo plugdev:

sudo chgrp plugdev /media/MioDisco

Impostiamo i permessi di scrittura al gruppo:

sudo chmod g+w /media/MioDisco

Imponiamo che solo i proprietari dei file possono cancellarli d
al dispositivo. (Tutti possono scrivere ma l'utente A non può cancellare un file creato dall'utente B).

sudo chmod +t /media/MioDisco

Ora, se ricolleghiamo la periferica, verrà montata in una cartella con sempre lo stesso nome e, come nel mio caso, non dovremmo modificare ogni volta le impostazioni di eventuali programmi che usano il dispositivo. Ciao uagliò!

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