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/usr/share/initramfs-tools/hooks/multipath is in multipath-tools-boot 0.5.0-6+deb8u2.

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The actual contents of the file can be viewed below.

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#!/bin/sh

PREREQS="udev"

prereqs() { echo "$PREREQS"; }

case $1 in
prereqs)
	prereqs
	exit 0
	;;
esac

if [ ! -x /sbin/multipath ]; then
	exit 0
fi

. /usr/share/initramfs-tools/hook-functions

add_bindings()
{
  if [ -r /etc/multipath/bindings ]; then
      mkdir -p $DESTDIR/etc/multipath
      cp /etc/multipath/bindings $DESTDIR/etc/multipath
  fi
}

add_udev_rules()
{
  for rules in 60-multipath.rules 60-kpartx.rules; do
    if [ -e /lib/udev/rules.d/$rules ]; then
      cp -p /lib/udev/rules.d/$rules $DESTDIR/lib/udev/rules.d/
    fi
  done
}

copy_exec /sbin/multipath 		/sbin
copy_exec /sbin/kpartx    		/sbin
copy_exec /sbin/dmsetup			/sbin
copy_exec /lib/udev/dmsetup_env		/lib/udev
copy_exec /lib/udev/kpartx_id		/lib/udev
mkdir -p $DESTDIR/lib/multipath/
for x in /lib/multipath/*; do
    copy_exec $x /lib/multipath/
done
add_udev_rules

[ -r /etc/multipath.conf ] && cp /etc/multipath.conf $DESTDIR/etc/
add_bindings

for x in dm-multipath dm-service-time dm-round-robin dm-emc; do
	manual_add_modules ${x}
done