#!/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.# This script assumes that gen_init_cpio is located in usr/ directory # error out on errorsset -e usage() {cat << EOFUsage:$0 [-o <file>] [-l <dep_list>] [-u <uid>] [-g <gid>] {-d | <cpio_source>} ...	-o <file>      Create initramfs file named <file> by using gen_init_cpio	-l <dep_list>  Create dependency list named <dep_list>	-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.	-d <date>      Use date for all file mtime values	<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. 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} 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} 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}" >> $cpio_list	echo "" >> $cpio_list} list_parse() {	if [ -z "$dep_list" -o -L "$1" ]; then		return	fi	echo "$1" | sed 's/:/\\:/g; s/$/ \\/' >> $dep_list} # 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}" >> $cpio_list 	return 0} unknown_option() {	printf "ERROR: unknown option \"$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} header() {	printf "\n#####################\n# $1\n" >> $cpio_list} # process one directory (incl sub-directories)dir_filelist() {	header "$1" 	srcdir=$(echo "$1" | sed -e 's://*:/:g')	dirlist=$(find "${srcdir}" -printf "%p %m %U %G\n" | LC_ALL=C sort) 	# If $dirlist is only one line, then the directory is empty	if [  "$(echo "${dirlist}" | wc -l)" -gt 1 ]; then		print_mtime "$1" 		echo "${dirlist}" | \		while read x; do			list_parse $x			parse $x		done	fi} input_file() {	source="$1"	if [ -f "$1" ]; then		# If a regular file is specified, assume it is in		# gen_init_cpio format		header "$1"		print_mtime "$1" >> $cpio_list		cat "$1"         >> $cpio_list		if [ -n "$dep_list" ]; then		        echo "$1 \\"  >> $dep_list			cat "$1" | while read type dir file perm ; do				if [ "$type" = "file" ]; then					echo "$file \\" >> $dep_list				fi			done		fi	elif [ -d "$1" ]; then		# If a directory is specified then add all files in it to fs		dir_filelist "$1"	else		echo "  ${prog}: Cannot open '$1'" >&2		exit 1	fi} prog=$0root_uid=0root_gid=0dep_list=timestamp=cpio_list=$(mktemp ${TMPDIR:-/tmp}/cpiolist.XXXXXX)# gen_init_cpio writes to stdout by defaultoutput="" trap "rm -f $cpio_list" EXIT while [ $# -gt 0 ]; do	arg="$1"	shift	case "$arg" in		"-l")	# files included in initramfs - used by kbuild			dep_list="$1"			echo "deps_initramfs := \\" > $dep_list			shift			;;		"-o")	# generate cpio image named $1			output="-o $1"			shift			;;		"-u")	# map $1 to uid=0 (root)			root_uid="$1"			[ "$root_uid" = "-1" ] && root_uid=$(id -u || echo 0)			shift			;;		"-g")	# map $1 to gid=0 (root)			root_gid="$1"			[ "$root_gid" = "-1" ] && root_gid=$(id -g || echo 0)			shift			;;		"-d")	# date for file mtimes			timestamp="$(date -d"$1" +%s || :)"			if test -n "$timestamp"; then				timestamp="-t $timestamp"			fi			shift			;;		"-h")			usage			exit 0			;;		*)			case "$arg" in				"-"*)					unknown_option					;;				*)	# input file/dir - process it					input_file "$arg"					;;			esac			;;	esacdone # If output_file is set we will generate cpio archive# we are careful to delete tmp filesusr/gen_init_cpio $output $timestamp $cpio_list