/usr/lib/dracut/modules.d/90aufs/aufs-mount.sh is in dracut-network 040+1-1.
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 | #!/bin/sh
# make a read-only nfsroot writeable by using aufs
# the nfsroot is already mounted to $NEWROOT
# add the parameter aufs to the kernel, to activate this feature
. /lib/dracut-lib.sh
aufs=$(getargs aufs)
if [ -z "$aufs" ] ; then
return
fi
modprobe aufs
# a little bit tuning
mount -o remount,nolock,noatime $NEWROOT
mkdir -p /live/image
mount --move $NEWROOT /live/image
mkdir /cow
mount -n -t tmpfs -o mode=0755 tmpfs /cow
mount -t aufs -o noatime,noxino,dirs=/cow=rw:/live/image=rr aufs $NEWROOT
mkdir -p $NEWROOT/live/cow
mkdir -p $NEWROOT/live/image
mount --move /cow $NEWROOT/live/cow
mount --move /live/image $NEWROOT/live/image
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