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Make udev rules more robust #78

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Make udev rules more robust #78

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0cae942
dmsetup: return non-zero on stdio I/O error
DemiMarie Apr 1, 2022
bedc445
Disable lvm2 udev rules if `dmsetup splitname` fails
DemiMarie Apr 1, 2022
45f8689
Disable udev rules if udev flags can't be obtained
DemiMarie Apr 1, 2022
b9ad503
Drop support for very old kernels
DemiMarie Apr 1, 2022
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Drop support for very old kernels 
All kernels Qubes OS uses are new enough to have the dm/ subdirectory.
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@DemiMarie
DemiMarie committed Apr 3, 2022
commit b9ad503010a240a12f46860349d35b1a7670ffa5
17 changes: 4 additions & 13 deletions udev/10-dm.rules.in
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Original file line number Diff line number Diff line change
Expand Up @@ -47,9 +47,6 @@ KERNEL!="dm-[0-9]*", GOTO="dm_end"
ACTION!="add|change", GOTO="dm_end"

# Decode udev control flags and set environment variables appropriately.
# These flags are encoded in DM_COOKIE variable that was introduced in
# kernel version 2.6.31. Therefore, we can use this feature with
# kernels >= 2.6.31 only. Cookie is not decoded for remove event.
ENV{DM_COOKIE}=="?*", IMPORT{program}!="(DM_EXEC)/dmsetup udevflags $env{DM_COOKIE}", GOTO="dm_disable"

# Rule out easy-to-detect inappropriate events first.
Expand Down Expand Up @@ -104,16 +101,10 @@ LABEL="dm_no_coldplug"
# |_ dev still not active 0 0
# \_ dev already active 1 0

# "dm" sysfs subdirectory is available in newer versions of DM
# only (kernels >= 2.6.29). We have to check for its existence
# and use dmsetup tool instead to get the DM name, uuid and
# suspended state if the "dm" subdirectory is not present.
# The "suspended" item was added even later (kernels >= 2.6.31),
# so we also have to call dmsetup if the kernel version used
# is in between these releases.
TEST=="dm", ENV{DM_NAME}="$attr{dm/name}", ENV{DM_UUID}="$attr{dm/uuid}", ENV{DM_SUSPENDED}="$attr{dm/suspended}"
TEST!="dm", IMPORT{program}="(DM_EXEC)/dmsetup info -j %M -m %m -c --nameprefixes --noheadings --rows -o name,uuid,suspended"
ENV{DM_SUSPENDED}!="?*", IMPORT{program}="(DM_EXEC)/dmsetup info -j %M -m %m -c --nameprefixes --noheadings --rows -o suspended"
# Kernels older than 2.6.31 do not have dm/suspended sysfs attribute and are not
# supported
ENV{DM_NAME}="$attr{dm/name}", ENV{DM_UUID}="$attr{dm/uuid}", ENV{DM_SUSPENDED}="$attr{dm/suspended}"
ENV{DM_SUSPENDED}!="?*", GOTO="dm_disable"

# dmsetup tool provides suspended state information in textual
# form with values "Suspended"/"Active". We translate it to
Expand Down