#!/bin/sh -e

version="$1"
kdumpdir="/var/lib/kdump"

[ -x /usr/sbin/mkinitramfs ] || exit 0

# passing the kernel version is required
if [ -z "${version}" ]; then
	echo >&2 "W: kdump-tools: ${DPKG_MAINTSCRIPT_PACKAGE:-kdump-tools package} did not pass a version number"
	exit 2
fi

if ! linux-version list | grep "${version}" > /dev/null ; then
	exit 0
fi

# exit if kernel does not need an initramfs
if [ "$INITRD" = 'No' ]; then
	exit 0
fi

# avoid running multiple times
if [ -n "$DEB_MAINT_PARAMS" ]; then
	eval set -- "$DEB_MAINT_PARAMS"
	if [ -z "$1" ] || [ "$1" != "configure" ]; then
		exit 0
	fi
fi

# We need a modified copy of initramfs-tools directory
# with MODULES=dep in initramfs.conf
if [ ! -d "$kdumpdir" ];then
	mkdir "$kdumpdir" || true
fi
# Force re-creation of $kdumpdir/initramfs-tools
# in case the source has changed since last time
# we ran
if [ -d "$kdumpdir/initramfs-tools" ];then
	rm -Rf $kdumpdir/initramfs-tools || true
fi
cp -pr /etc/initramfs-tools "$kdumpdir" || true

initramfsdir="$kdumpdir/initramfs-tools"

# Add scsi_dh_* modules if in use otherwise
# kexec reboot on multipath will fail
# (LP: #1635597)
for I in $(lsmod | grep scsi_dh | cut -d" " -f1);do
	echo "${I}" >> $initramfsdir/modules
done

sed -e 's/MODULES=.*/MODULES=dep/' /etc/initramfs-tools/initramfs.conf > "$initramfsdir/initramfs.conf" || true
if ! [ -e "$initramfsdir/initramfs.conf" ];then
	echo >&2 "W: kdump-tools: Unable to create $initramfsdir/initramfs.conf"
	exit 2
fi

# Cleaning up existing initramfs with same version
# as mkinitramfs do not have a force option
if [ -e "$kdumpdir/initrd.img-${version}" ];then
	rm -f "$kdumpdir/initrd.img-${version}" || true
fi

# we're good - create initramfs.
echo "kdump-tools: Generating $kdumpdir/initrd.img-${version}"
if mkinitramfs -d "$initramfsdir" -o "$kdumpdir/initrd.img-${version}.new" "${version}";then
	mv "$kdumpdir/initrd.img-${version}.new" "$kdumpdir/initrd.img-${version}"
else
	mkinitramfs_return="$?"
	rm -f "${initramfs}.new"
	echo "update-initramfs: failed for ${initramfs} with $mkinitramfs_return." >&2
        exit $mkinitramfs_return
fi