Re: udev remove ATTR(S) not working

[Andrey Borzenkov <arvidjaar@mail.ru>]

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On Sunday 10 June 2007, Farkas Levente wrote:
> Andrey Borzenkov wrote:
> > On Friday 08 June 2007, Farkas Levente wrote:
> >> Andrey Borzenkov wrote:
> >>> On Thursday 07 June 2007, Farkas Levente wrote:
> >>>> ok so what i really need to somehow properly identify my pen drive. my
> >>>> home partition is luks encrypted and the key on on my pen drive. when
> >>>> i pug in the pen, udev recognize it and mount
> >>>
> >>> Any reason you are not using HAL for this? udev is simply the wrong
> >>> place to do such things. And HAL supports LUKS natively AFAIR.
> >>
> >> i don't see how can i use hal here? would you explain it to me?!
> >
> > you never mentioned before that you want to mount encrypted partition
> > when you are ot logged on. I am not sure how it works (you need to enter
> > you key at some point, do not you?) but you can use something like ivman
> > or write trivial handler in python that listens to device insert events
> > and mounts them via HAL API.
>
> my home directory is a luks encrypted volume:

OK

> ----------------------------------------
> # df
> Filesystem           1K-blocks      Used Available Use% Mounted on
> /dev/mapper/VolGroup00-LogVol00
>                       34692928   5613204  27288956  18% /
> /dev/sda1               101086     12297     83570  13% /boot
> tmpfs                   517532         0    517532   0% /dev/shm
> /dev/mapper/home-lfarkas
>                       39509616  27716680  11391540  71% /home/lfarkas
> # cryptsetup status home-lfarkas
> /dev/mapper/home-lfarkas is active:
>   cipher:  twofish-cbc-essiv:sha256
>   keysize: 256 bits
>   device:  /dev/mapper/VolGroup00-LogVol02
>   offset:  2056 sectors
>   size:    80279544 sectors
>   mode:    read/write
> ----------------------------------------
> the keyfile (ie. the password to the encrypted partition) is on the
> pendrive hidden partition. _before_ i login i just plug in the pendrive
> and udev recognize it and mount the pendrive and use the file which
> contains the encryption key and mount my volume.

Yes, I guess as it stands now, HAL is not capable of doing it (even when user 
is logged on).  I guess it makes sense to forward this full description to 
HAL list for discussion.

> this's my udev rules: 
> ----------------------------------------
> # cat /etc/udev/rules.d/10-local.rules
> ACTION=="add", KERNEL=="sd[a-z]", SUBSYSTEM=="block",
> ATTR{size}=="2880", ATTRS{serial}=="07530736300A", ATTRS{product}=="USB
> DISK Pro", SYMLINK+="lfarkas", RUN+="/root/bin/home-up
> /dev/VolGroup00/LogVol02 lfarkas"
>
> ACTION=="remove", KERNEL=="sd[a-z]", SUBSYSTEM=="block",
> RUN+="/root/bin/home-down lfarkas"
[...]
> this's working. the only problem i'd like to do it better ie somehow
> recognize only _my_ pendrive. in case of add i can use ATTR{size},
> ATTRS{serial}, ATTRS{product}, but in remove i can't do any better then
> KERNEL=="sd[a-z]", SUBSYSTEM=="block" which is a satisfied by all kind
> of removable device:-( so that's my problem. ie if i plug and remove my
> camera it also try to remove my home partition:-(

Have you ever tried udevinfo?

{pts/0}% udevinfo -q env --name sda
ID_VENDOR=ATA
ID_MODEL=IC25N020ATDA04-0
ID_REVISION=DA3O
ID_SERIAL=SATA_IC25N020ATDA04-_63A63GY1081
ID_SERIAL_SHORT=63A63GY1081
ID_TYPE=disk
ID_BUS=scsi
ID_ATA_COMPAT=IC25N020ATDA04-0_63A63GY1081
ID_PATH=pci-0000:00:04.0-scsi-0:0:0:0
ID_EDD=int13_dev80

notice ID_SERIAL or ID_SERIAL_SHORT?

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