#!/bin/bash
#
# Find all duplicate or obsolete firmware that is being carried
# in the kernel firmware directory. Compare these files against
# the linux-firmware package for the approriate release. For example,
# assuming this is raring, then compare the kernel firmware files
# against the raring branch of linux-firmware.
#
# Example: $0 ~/ubuntu/linux-firmware-raring

USEAGE="$0 LINUX-FIRMWARE"

. debian/debian.env

NFWINFO="`find $DEBIAN -name fwinfo|wc -l`"
if [ ! "$NFWINFO" = "1" ]
then
	echo Your repo is hosed. There can only be one fwinfo file.
	find $DEBIAN -name fwinfo
	exit 1
fi

FWINFO="`pwd`/`find $DEBIAN -name fwinfo`"

if [ "$1" = "" ]
then
	echo $USEAGE
	exit 1
fi
FW="$1"

if [ ! -f $FW/WHENCE ]
then
	echo Bogus linux-firmware directory
	exit 1
fi
if ! egrep -q "^firmware:" $FWINFO
then
	echo Bogus firmware info file
	exit 1
fi

#
# Prepare the tree and make firmware.
#
TEE="tee -a"
LO=`pwd`/firmware.txt
LF=`pwd`/lib/firmware
rm -rf debian/build $LF $LO
fakeroot debian/rules clean prepare-generic
cp debian/build/build-generic/.config .
mkdir -p $LF
make firmware_install INSTALL_MOD_PATH=`pwd`

(cd $LF
find . -type f | while read f
do
	BN="`basename $f`"

	if ! grep -q $BN $FWINFO
	then
		echo "Unused firmware: $f" | $TEE $LO
	else
		if [ -f $FW/$f ]
		then
			if ! cmp $FW/$f $f
			then
				echo "$f differs" | $TEE $LO
			else
				echo "$f is duplicated" | $TEE $LO
			fi
		else
			echo "$f does not exist in $FW" | $TEE $LO
		fi
	fi
done)

#
# Check for firmware files referenced by the kernel
# that do not exist in either location.
#
cat $FWINFO | while read fwi f
do
	if [ -s lib/firmware/$f ] || [ -s $FW/$f ]
	then
		continue
	else
		echo "Missing firmware $f" | $TEE $LO
	fi
done