[systemd-devel] udev: 60-persistent-storage.rules attempts blkid on removable devices with no medium present

[Hans Scholze]

Hi,

I'm not sure if this is considered a problem but I noticed some spurious
error messages during boot.  The source appears to be:

1. a USB media card reader is plugged in at boot
2. the device node exists regardless of whether a card is present (expected)
3. line 70 of 60-persistent-storage.rules (KERNEL!="sr*",
IMPORT{builtin}="blkid") attempts blkid on the device with no card present
4. the open() call in builtin_blkid() in udev-builtin-blkid.c fails
resulting in an "error: /dev/sdd: No medium found" message printed to stderr

Adding ATTR{removable}=="1", ATTR{size}=="0", GOTO="skip_blkid" around the
rule seems to work in my case but I don't know if that is a good thing to
do in general.

For comparison, the rules that run blkid on CD drives (lines 62-67) do
check first to make sure a CD is inserted.  (At least I think that's
what ENV{ID_CDROM_MEDIA_TRACK_COUNT_DATA}=="?*"
is doing.)

Some other discussions I came across related to the "No medium found"
message:
https://bbs.archlinux.org/viewtopic.php?id=190229
https://bugs.freedesktop.org/show_bug.cgi?id=86414

Thanks,
Hans
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