systemrescue-zfs/airootfs/usr/lib/udev/rules.d/09-nomdlvm.rules

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SUBSYSTEM!="block", GOTO="dm_end"
# treat all block devices according to boot cmdline option:
# we don't know if the device is actually dm or lvm
# but once we know, it is too late
# "nomdlvm" on kernel command line stops activating or
# registering any dm or lvm device
IMPORT{cmdline}="nomdlvm"
ENV{nomdlvm}=="?*", GOTO="dm_disable"
GOTO="dm_end"
LABEL="dm_disable"
ENV{DM_UDEV_DISABLE_SUBSYSTEM_RULES_FLAG}="1"
ENV{DM_UDEV_DISABLE_DISK_RULES_FLAG}="1"
ENV{DM_UDEV_DISABLE_OTHER_RULES_FLAG}="1"
OPTIONS:="nowatch"
LABEL="dm_end"