/usr/lib/dracut/modules.d/90mdraid/mdraid-waitclean.sh is in dracut-core 047-2.
This file is owned by root:root, with mode 0o755.
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 | #!/bin/sh
if getargbool 0 rd.md.waitclean; then
_offroot=$(strstr "$(mdadm --help-options 2>&1)" offroot && echo --offroot)
type getarg >/dev/null 2>&1 || . /lib/dracut-lib.sh
containers=""
for md in /dev/md[0-9_]*; do
[ -b "$md" ] || continue
udevinfo="$(udevadm info --query=env --name=$md)"
strstr "$udevinfo" "DEVTYPE=partition" && continue
if strstr "$udevinfo" "MD_LEVEL=container"; then
containers="$containers $md"
continue
fi
info "Waiting for $md to become clean"
mdadm $_offroot -W "$md" >/dev/null 2>&1
done
for md in $containers; do
info "Waiting for $md to become clean"
mdadm $_offroot -W "$md" >/dev/null 2>&1
done
unset containers udevinfo _offroot
fi
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