#!/bin/sh

  # SPDX-License-Identifier: GPL-2.0
  # Linux kernel symbol namespace import generator
  #
  # This script requires a minimum spatch version.
  SPATCH_REQ_VERSION="1.0.4"
  
  DIR="$(dirname $(readlink -f $0))/.."
  SPATCH="`which ${SPATCH:=spatch}`"
  if [ ! -x "$SPATCH" ]; then
  	echo 'spatch is part of the Coccinelle project and is available at http://coccinelle.lip6.fr/'
  	exit 1
  fi
  
  SPATCH_REQ_VERSION_NUM=$(echo $SPATCH_REQ_VERSION | ${DIR}/scripts/ld-version.sh)
  SPATCH_VERSION=$($SPATCH --version | head -1 | awk '{print $3}')
  SPATCH_VERSION_NUM=$(echo $SPATCH_VERSION | ${DIR}/scripts/ld-version.sh)
  
  if [ "$SPATCH_VERSION_NUM" -lt "$SPATCH_REQ_VERSION_NUM" ] ; then
  	echo "spatch needs to be version $SPATCH_REQ_VERSION or higher"
  	exit 1
  fi

  if [ "$KBUILD_EXTMOD" ]; then
  	src_prefix=
  else
  	src_prefix=$srctree/
  fi

  generate_deps_for_ns() {
  	$SPATCH --very-quiet --in-place --sp-file \

  		$srctree/scripts/coccinelle/misc/add_namespace.cocci -D nsdeps -D ns=$1 $2

  }
  
  generate_deps() {

  	local mod=${1%.ko:}
  	shift
  	local namespaces="$*"
  	local mod_source_files="`cat $mod.mod | sed -n 1p                      \

  					      | sed -e 's/\.o/\.c/g'           \

  					      | sed "s|[^ ]* *|${src_prefix}&|g"`"

  	for ns in $namespaces; do
  		echo "Adding namespace $ns to module $mod.ko."

  		generate_deps_for_ns $ns "$mod_source_files"

  		# sort the imports
  		for source_file in $mod_source_files; do
  			sed '/MODULE_IMPORT_NS/Q' $source_file > ${source_file}.tmp
  			offset=$(wc -l ${source_file}.tmp | awk '{print $1;}')

  			cat $source_file | grep MODULE_IMPORT_NS | LANG=C sort -u >> ${source_file}.tmp

  			tail -n +$((offset +1)) ${source_file} | grep -v MODULE_IMPORT_NS >> ${source_file}.tmp
  			if ! diff -q ${source_file} ${source_file}.tmp; then
  				mv ${source_file}.tmp ${source_file}
  			else
  				rm ${source_file}.tmp
  			fi
  		done
  	done
  }

  while read line
  do
  	generate_deps $line

  done < $MODULES_NSDEPS