This file is indexed.

/lib/udev/rules.d/64-md-raid-assembly.rules is in mdadm 3.4-4+b1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# do not edit this file, it will be overwritten on update

# Don't process any events if anaconda is running as anaconda brings up
# raid devices manually
ENV{ANACONDA}=="?*", GOTO="md_inc_end"
# assemble md arrays

SUBSYSTEM!="block", GOTO="md_inc_end"

# handle potential components of arrays (the ones supported by md)
ENV{ID_FS_TYPE}=="linux_raid_member", GOTO="md_inc"

# "noiswmd" on kernel command line stops mdadm from handling
#  "isw" (aka IMSM - Intel RAID).
# "nodmraid" on kernel command line stops mdadm from handling
#  "isw" or "ddf".
IMPORT{cmdline}="noiswmd"
IMPORT{cmdline}="nodmraid"

ENV{nodmraid}=="?*", GOTO="md_inc_end"
ENV{ID_FS_TYPE}=="ddf_raid_member", GOTO="md_inc"
ENV{noiswmd}=="?*", GOTO="md_inc_end"
ENV{ID_FS_TYPE}=="isw_raid_member", GOTO="md_inc"
GOTO="md_inc_end"

LABEL="md_inc"

# remember you can limit what gets auto/incrementally assembled by
# mdadm.conf(5)'s 'AUTO' and selectively whitelist using 'ARRAY'
ACTION=="add|change", IMPORT{program}="/sbin/mdadm --incremental --export $devnode --offroot ${DEVLINKS}"
ACTION=="add|change", ENV{MD_STARTED}=="*unsafe*", ENV{MD_FOREIGN}=="no", ENV{SYSTEMD_WANTS}+="mdadm-last-resort@$env{MD_DEVICE}.timer"
ACTION=="remove", ENV{ID_PATH}=="?*", RUN+="/sbin/mdadm -If $name --path $env{ID_PATH}"
ACTION=="remove", ENV{ID_PATH}!="?*", RUN+="/sbin/mdadm -If $name"

LABEL="md_inc_end"