Le 29/06/2017 à 14:51, k...@aspodata.se a écrit :
Didier:
Le 26/06/2017 à 23:57, Steve Litt a écrit :
On Mon, 26 Jun 2017 12:25:40 +0200
Didier Kryn <k...@in2p3.fr> wrote:
mdev is fine for a server. It is lacking a few features w/r udev:
1) It doesn't build /dev/disk/[by-id | by-label | by-partuuid |
by-path | by-uuid]
I tried to add this feature by the mean an mdev-called
script ~ a year ago in a Busybox OS, and succeeded easily with
by-label and by-uuid. I don't know the usage of the others anyway.
Could you please post that shellscript and a couple sentences about how
to install it?
Please find it in attachment. The archive contains four files:
README
etc/init.d/mdev -- The start/stop script for Sysvinit
etc/mdev.conf -- The necessary configuration file for mdev
sbin/mdev-disk -- An experimental script to manage /dev/disk/by-label
-- and /dev/disk/by-uuid
I might restart experimenting with it some day...
Hmm, something similar could be used to create thoose /dev/disk/by-*,
for a static /dev:
find /dev -type b | xargs blkid | sort | some_script_to_populate_by_xxx
But if that is only a transformed /sys/class/block, wouldn't it be
easier if there was a /sys/class/uuid or similar ?
Also man blkid says:
# man blkid | grep -A6 ' -L label$'
-L label
Look up the device that uses this label (equal to: -l -o device
-t LABEL=<label>). This lookup method is able to reliably use
/dev/disk/by-label udev symlinks (dependent on a setting in
/etc/blkid.conf). Avoid using the symlinks directly; it is not
reliable to use the symlinks without verification. The -L
option works on systems with and without udev.
so if /dev/disk/by-* isn't reliable, why do we have them ?
Regards,
/Karl Hammar
Everybody is using blkid to build thiese links, my script as well as
Udev and Vdev. You probably noticed that blkid has a special option for
Udev because Udev people are too lazzy to parse the response. In Vdev,
Jude made the parsing job to be compatible with Busybox's blkid which
hasn't this special format.
So blkid authors on one hand provide a special format for Udev to
create the symlinks, and on the other hand claim that they aren't reliable!
Didier
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