#!/bin/sh
#
# Generate Supplements: lines for the kernel-firmware package, by looking at
# the firmware: and alias: fields of kernel modules. Ideally, this script
# should be run automatically during each build, the problem is that
# kernel-firmware is a noarch package, but the kernel packages differ among
# architectures, so the results could change randomly. For now, run this
# script manually against the i586 desktop kernel, like this
#
# $ tar xf linux-firmware-$version.tar.bz2
# $ ./firmware-supplements.sh linux-firmware-$version \
#       kernel-desktop-*.i586.rpm >firmware-supplements.txt

USAGE="$0 <firmware directory> [kernel directory]
$0 <firmware directory> kernel.rpm"
usage()
{
	echo "$USAGE" >&2
	exit 1
}

fw_dir="$1"
kernel="$2"

if ! test -d "$fw_dir"; then
	usage
fi

trap 'rm -rf "$tmp"' EXIT
tmp=$(mktemp -d)

get_kernel_dir()
{
	# default
	if test -z "$kernel"; then
		kernel="/lib/modules/$(uname -r)/kernel"
		if ! test -d "$kernel"; then
			echo "No kernel found below /lib/modules/$(uname -r)" >&2
			usage
		fi
		return
	fi
	# /lib/modules/$version ?
	if test -d "$kernel/kernel"; then
		kernel="$_"
		return
	fi
	# just $version ?
	if test -d "/lib/modules/$kernel/kernel"; then
		kernel="$_"
		return
	fi
	# a kernel rpm?
	case "$kernel" in
	*.rpm)
		mkdir "$tmp/kernel"
		rpm2cpio "$kernel" | (cd "$tmp/kernel"; cpio -id)
		kernel="$tmp/kernel"
		return
	esac
	usage
}

get_kernel_dir

find "$kernel" -name '*.ko' -type f | while read ko; do
	firmware=$(/sbin/modinfo -F firmware "$ko")
	for fw in $firmware; do
		if test -f "$fw_dir/$fw"; then
			echo "$ko"
			break
		fi
	done
done | sort | /usr/lib/rpm/find-supplements.ksyms | \
sed 's/^modalias(kernel-[^:]*:/modalias(/' # strip the kernel-$flavor: prefix