Re: udev remove ATTR(S) not working

[Farkas Levente <lfarkas@bppiac.hu>]

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:
----------------------------------------
# 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. 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"
----------------------------------------
and the used scripts:
----------------------------------------
# cat /root/bin/home-up
#!/bin/bash
if [ -z "`grep /home/$2 /proc/mounts`" ]; then
        TMPDEV="/mnt/tmp"
        mount -t vfat $DEVNAME $TMPDEV
        KEY="$TMPDEV/.$2.key"
        if [ ! -f $KEY ]; then
                exit 1
        fi
        /root/bin/luks-up $1 /home/$2 < $KEY
        RES=$?
        umount $TMPDEV
        exit $RES
fi
# cat /root/bin/home-down
#!/bin/bash
if [ -z "`ps -u $1|grep .Xclients|egrep -v grep`" ]; then
        killall -u $1
        umount /media/*
        sleep 5
        /root/bin/luks-down /home/$1
fi
----------------------------------------
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:-(
i hope it's clear now.

-- 
  Levente                               "Si vis pacem para bellum!"

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