В Sun, 03 Nov 2013 18:16:09 +0100
"Thomas Schmitt" <scdbackup@xxxxxxx> пишет:
> Hi,
>
> i believe to have found the udev rules in Debian 6 which
> govern the population of /dev/disk/by-label.
>
> File
> /lib/udev/rules.d/60-persistent-storage.rules
> has
> # probe filesystem metadata of disks
> KERNEL!="sr*", IMPORT{program}="/sbin/blkid -o udev -p $tempnode"
> ...
> ENV{ID_FS_LABEL_ENC}=="?*", ENV{ID_FS_USAGE}=="filesystem|other", \
> SYMLINK+="disk/by-label/$env{ID_FS_LABEL_ENC}"
>
> I understand that if blkid sets variable ID_FS_LABEL_ENC to
> a non-empty value, then this will become the link name in ./by-label.
> The link target is the device that is being examined by the rule.
>
> From a USB stick with partition start LBA 1, i get:
>
> $ /sbin/blkid -o udev -p /dev/sdb
> ID_PART_TABLE_TYPE=dos
> ID_FS_LABEL=epidemic-4.1-b1-1-ts-amd64
> ID_FS_LABEL_ENC=epidemic-4.1-b1-1-ts-amd64
> ID_FS_TYPE=iso9660
> ID_FS_USAGE=filesystem
> $ /sbin/blkid -o udev -p /dev/sdb1
> $
>
> So why the hell does /dev/sdb1 become link target ?
> Its ID_FS_LABEL_ENC must be empty.
>
> Any idea how to get a verbous log of these decisions ?
>
I confirm this. The culprit is this rule in 60-persistent-storage.rules:
# for partitions import parent information
ENV{DEVTYPE}=="partition", IMPORT{parent}="ID_*"
I'm not really sure how exactly to fix it. I.e. normally it is assumed
that device is either partitioned or not. Situation when we have
filesystem on a whole disk *and* individual partitions ... not sure.
I'm interested in which information actually needs to be imported from
parent. May be it should be less aggressive.
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