/usr/lib/dracut/modules.d/90mdraid/65-md-incremental-imsm.rules is in dracut-core 047-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 | # This file causes block devices with Linux RAID (mdadm) signatures to
# automatically cause mdadm to be run.
# See udev(8) for syntax
ACTION!="add|change", GOTO="md_end"
SUBSYSTEM!="block", GOTO="md_end"
ENV{rd_NO_MD}=="?*", GOTO="md_end"
KERNEL=="md*", ENV{ID_FS_TYPE}!="linux_raid_member", GOTO="md_end"
KERNEL=="md*", ACTION!="change", GOTO="md_end"
# Also don't process disks that are slated to be a multipath device
ENV{DM_MULTIPATH_DEVICE_PATH}=="?*", GOTO="md_end"
ENV{ID_FS_TYPE}=="ddf_raid_member|isw_raid_member|linux_raid_member", GOTO="md_try"
GOTO="md_end"
LABEL="md_try"
ENV{ID_FS_TYPE}=="isw_raid_member", ENV{rd_NO_MDIMSM}=="?*", GOTO="md_end"
ENV{ID_FS_TYPE}=="ddf_raid_member", ENV{rd_NO_MDDDF}=="?*", GOTO="md_end"
# already done ?
PROGRAM="/bin/sh -c 'for i in $sys/$devpath/holders/md[0-9_]*; do [ -e $$i ] && exit 0; done; exit 1;' ", \
GOTO="md_end"
# for native arrays - array's uuid has to be specified
# for containers - container's uuid has to be specified
# TODO : how to get embedded array's uuid having container's component ?
#
# UUID CHECK
ENV{DEVTYPE}!="partition", \
RUN+="/sbin/partx -d --nr 1-1024 $env{DEVNAME}"
RUN+="/sbin/initqueue --timeout --name 50-mdraid_start --onetime --unique /sbin/mdraid_start"
#
# Incrementally build the md array; this will automatically assemble
# any eventual containers as well (imsm, ddf)
#
LABEL="md_incremental"
RUN+="/sbin/mdadm $env{rd_MD_OFFROOT} -I $env{DEVNAME}"
LABEL="md_end"
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