#!/bin/sh# Copyright (C) Martin Schlemmer <azarah@nosferatu.za.org># Copyright (C) 2006 Sam Ravnborg <sam@ravnborg.org>## Released under the terms of the GNU GPL## Generate a cpio packed initramfs. It uses gen_init_cpio to generate# the cpio archive, and then compresses it.# The script may also be used to generate the inputfile used for gen_init_cpio# This script assumes that gen_init_cpio is located in usr/ directory # error out on errorsset -e usage() {cat << EOFUsage:$0 [-o <file>] [-u <uid>] [-g <gid>] {-d | <cpio_source>} ...	-o <file>      Create compressed initramfs file named <file> using		       gen_init_cpio and compressor depending on the extension	-u <uid>       User ID to map to user ID 0 (root).		       <uid> is only meaningful if <cpio_source> is a		       directory.  "squash" forces all files to uid 0.	-g <gid>       Group ID to map to group ID 0 (root).		       <gid> is only meaningful if <cpio_source> is a		       directory.  "squash" forces all files to gid 0.	<cpio_source>  File list or directory for cpio archive.		       If <cpio_source> is a .cpio file it will be used		       as direct input to initramfs.	-d             Output the default cpio list. All options except -o and -l may be repeated and are interpretedsequentially and immediately.  -u and -g states are preserved across<cpio_source> options so an explicit "-u 0 -g 0" is requiredto reset the root/group mapping.EOF} # awk style field access# $1 - field number; rest is argument stringfield() {	shift $1 ; echo $1} list_default_initramfs() {	# echo usr/kinit/kinit	:} default_initramfs() {	cat <<-EOF >> ${output}		# This is a very simple, default initramfs 		dir /dev 0755 0 0		nod /dev/console 0600 0 0 c 5 1		dir /root 0700 0 0		# file /kinit usr/kinit/kinit 0755 0 0		# slink /init kinit 0755 0 0	EOF} filetype() {	local argv1="$1" 	# symlink test must come before file test	if [ -L "${argv1}" ]; then		echo "slink"	elif [ -f "${argv1}" ]; then		echo "file"	elif [ -d "${argv1}" ]; then		echo "dir"	elif [ -b "${argv1}" -o -c "${argv1}" ]; then		echo "nod"	elif [ -p "${argv1}" ]; then		echo "pipe"	elif [ -S "${argv1}" ]; then		echo "sock"	else		echo "invalid"	fi	return 0} list_print_mtime() {	:} print_mtime() {	local my_mtime="0" 	if [ -e "$1" ]; then		my_mtime=$(find "$1" -printf "%T@\n" | sort -r | head -n 1)	fi 	echo "# Last modified: ${my_mtime}" >> ${output}	echo "" >> ${output}} list_parse() {	[ ! -L "$1" ] && echo "$1 \\" || :} # for each file print a line in following format# <filetype> <name> <path to file> <octal mode> <uid> <gid># for links, devices etc the format differs. See gen_init_cpio for detailsparse() {	local location="$1"	local name="/${location#${srcdir}}"	# change '//' into '/'	name=$(echo "$name" | sed -e 's://*:/:g')	local mode="$2"	local uid="$3"	local gid="$4"	local ftype=$(filetype "${location}")	# remap uid/gid to 0 if necessary	[ "$root_uid" = "squash" ] && uid=0 || [ "$uid" -eq "$root_uid" ] && uid=0	[ "$root_gid" = "squash" ] && gid=0 || [ "$gid" -eq "$root_gid" ] && gid=0	local str="${mode} ${uid} ${gid}" 	[ "${ftype}" = "invalid" ] && return 0	[ "${location}" = "${srcdir}" ] && return 0 	case "${ftype}" in		"file")			str="${ftype} ${name} ${location} ${str}"			;;		"nod")			local dev=`LC_ALL=C ls -l "${location}"`			local maj=`field 5 ${dev}`			local min=`field 6 ${dev}`			maj=${maj%,} 			[ -b "${location}" ] && dev="b" || dev="c" 			str="${ftype} ${name} ${str} ${dev} ${maj} ${min}"			;;		"slink")			local target=`readlink "${location}"`			str="${ftype} ${name} ${target} ${str}"			;;		*)			str="${ftype} ${name} ${str}"			;;	esac 	echo "${str}" >> ${output} 	return 0} unknown_option() {	printf "ERROR: unknown option \"$arg\"\n" >&2	printf "If the filename validly begins with '-', " >&2	printf "then it must be prefixed\n" >&2	printf "by './' so that it won't be interpreted as an option." >&2	printf "\n" >&2	usage >&2	exit 1} list_header() {	:} header() {	printf "\n#####################\n# $1\n" >> ${output}} # process one directory (incl sub-directories)dir_filelist() {	${dep_list}header "$1" 	srcdir=$(echo "$1" | sed -e 's://*:/:g')	dirlist=$(find "${srcdir}" -printf "%p %m %U %G\n") 	# If $dirlist is only one line, then the directory is empty	if [  "$(echo "${dirlist}" | wc -l)" -gt 1 ]; then		${dep_list}print_mtime "$1" 		echo "${dirlist}" | \		while read x; do			${dep_list}parse ${x}		done	fi} # if only one file is specified and it is .cpio file then use it direct as fs# if a directory is specified then add all files in given direcotry to fs# if a regular file is specified assume it is in gen_initramfs formatinput_file() {	source="$1"	if [ -f "$1" ]; then		${dep_list}header "$1"		is_cpio="$(echo "$1" | sed 's/^.*\.cpio\(\..*\)\?/cpio/')"		if [ $2 -eq 0 -a ${is_cpio} = "cpio" ]; then			cpio_file=$1			echo "$1" | grep -q '^.*\.cpio\..*' && is_cpio_compressed="compressed"			[ ! -z ${dep_list} ] && echo "$1"			return 0		fi		if [ -z ${dep_list} ]; then			print_mtime "$1" >> ${output}			cat "$1"         >> ${output}		else		        echo "$1 \\"			cat "$1" | while read type dir file perm ; do				if [ "$type" = "file" ]; then					echo "$file \\";				fi			done		fi	elif [ -d "$1" ]; then		dir_filelist "$1"	else		echo "  ${prog}: Cannot open '$1'" >&2		exit 1	fi} prog=$0root_uid=0root_gid=0dep_list=cpio_file=cpio_list=output="/dev/stdout"output_file=""is_cpio_compressed=compr="gzip -n -9 -f" arg="$1"case "$arg" in	"-l")	# files included in initramfs - used by kbuild		dep_list="list_"		echo "deps_initramfs := $0 \\"		shift		;;	"-o")	# generate compressed cpio image named $1		shift		output_file="$1"		cpio_list="$(mktemp ${TMPDIR:-/tmp}/cpiolist.XXXXXX)"		output=${cpio_list}		echo "$output_file" | grep -q "\.gz$" \                && [ -x "`which gzip 2> /dev/null`" ] \                && compr="gzip -n -9 -f"		echo "$output_file" | grep -q "\.bz2$" \                && [ -x "`which bzip2 2> /dev/null`" ] \                && compr="bzip2 -9 -f"		echo "$output_file" | grep -q "\.lzma$" \                && [ -x "`which lzma 2> /dev/null`" ] \                && compr="lzma -9 -f"		echo "$output_file" | grep -q "\.xz$" \                && [ -x "`which xz 2> /dev/null`" ] \                && compr="xz --check=crc32 --lzma2=dict=1MiB"		echo "$output_file" | grep -q "\.lzo$" \                && [ -x "`which lzop 2> /dev/null`" ] \                && compr="lzop -9 -f"		echo "$output_file" | grep -q "\.lz4$" \                && [ -x "`which lz4 2> /dev/null`" ] \                && compr="lz4 -9 -f"		echo "$output_file" | grep -q "\.cpio$" && compr="cat"		shift		;;esacwhile [ $# -gt 0 ]; do	arg="$1"	shift	case "$arg" in		"-u")	# map $1 to uid=0 (root)			root_uid="$1"			shift			;;		"-g")	# map $1 to gid=0 (root)			root_gid="$1"			shift			;;		"-d")	# display default initramfs list			default_list="$arg"			${dep_list}default_initramfs			;;		"-h")			usage			exit 0			;;		*)			case "$arg" in				"-"*)					unknown_option					;;				*)	# input file/dir - process it					input_file "$arg" "$#"					;;			esac			;;	esacdone # If output_file is set we will generate cpio archive and compress it# we are careful to delete tmp filesif [ ! -z ${output_file} ]; then	if [ -z ${cpio_file} ]; then		timestamp=		if test -n "$KBUILD_BUILD_TIMESTAMP"; then			timestamp="$(date -d"$KBUILD_BUILD_TIMESTAMP" +%s || :)"			if test -n "$timestamp"; then				timestamp="-t $timestamp"			fi		fi		cpio_tfile="$(mktemp ${TMPDIR:-/tmp}/cpiofile.XXXXXX)"		usr/gen_init_cpio $timestamp ${cpio_list} > ${cpio_tfile}	else		cpio_tfile=${cpio_file}	fi	rm ${cpio_list}	if [ "${is_cpio_compressed}" = "compressed" ]; then		cat ${cpio_tfile} > ${output_file}	else		(cat ${cpio_tfile} | ${compr}  - > ${output_file}) \		|| (rm -f ${output_file} ; false)	fi	[ -z ${cpio_file} ] && rm ${cpio_tfile}fiexit 0