usr/gen_initramfs_list.sh - linux - Git at Google

 #!/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 errors
 set -e

 usage() {
 cat << EOF
 Usage:
 $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 interpreted
 sequentially and immediately.  -u and -g states are preserved across
 <cpio_source> options so an explicit "-u 0 -g 0" is required
 to reset the root/group mapping.
 EOF
 }

 # awk style field access
 # $1 - field number; rest is argument string
 field() {
 	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() {
 	if [ -L "$1" ]; then
 		return
 	fi
 	echo "$1" | sed 's/:/\\:/g; s/$/ \\/'
 }

 # 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 details
 parse() {
 	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" | LANG=C sort)

 	# 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 format
 input_file() {
 	source="$1"
 	if [ -f "$1" ]; then
 		${dep_list}header "$1"
 		is_cpio="$(echo "$1" | sed 's/^.*\.cpio\(\..*\)\{0,1\}/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=$0
 root_uid=0
 root_gid=0
 dep_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 -l -9 -f"
 		echo "$output_file" | grep -q "\.cpio$" && compr="cat"
 		shift
 		;;
 esac
 while [ $# -gt 0 ]; do
 	arg="$1"
 	shift
 	case "$arg" in
 		"-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=$(id -g || echo 0)
 			shift
 			;;
 		"-d")	# display default initramfs list
 			default_list="$arg"
 			${dep_list}default_initramfs
 			;;
 		"-h")
 			usage
 			exit 0
 			;;
 		*)
 			case "$arg" in
 				"-"*)
 					unknown_option
 					;;
 				*)	# input file/dir - process it
 					input_file "$arg" "$#"
 					;;
 			esac
 			;;
 	esac
 done

 # If output_file is set we will generate cpio archive and compress it
 # we are careful to delete tmp files
 if [ ! -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}
 fi
 exit 0
	#!/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 errors
	set -e

	usage() {
	cat << EOF
	Usage:
	$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 interpreted
	sequentially and immediately. -u and -g states are preserved across
	<cpio_source> options so an explicit "-u 0 -g 0" is required
	to reset the root/group mapping.
	EOF
	}

	# awk style field access
	# $1 - field number; rest is argument string
	field() {
	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() {
	if [ -L "$1" ]; then
	return
	fi
	echo "$1" \| sed 's/:/\\:/g; s/$/ \\/'
	}

	# 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 details
	parse() {
	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" \| LANG=C sort)

	# 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 format
	input_file() {
	source="$1"
	if [ -f "$1" ]; then
	${dep_list}header "$1"
	is_cpio="$(echo "$1" \| sed 's/^.\.cpio\(\..\)\{0,1\}/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=$0
	root_uid=0
	root_gid=0
	dep_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 -l -9 -f"
	echo "$output_file" \| grep -q "\.cpio$" && compr="cat"
	shift
	;;
	esac
	while [ $# -gt 0 ]; do
	arg="$1"
	shift
	case "$arg" in
	"-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=$(id -g \|\| echo 0)
	shift
	;;
	"-d") # display default initramfs list
	default_list="$arg"
	${dep_list}default_initramfs
	;;
	"-h")
	usage
	exit 0
	;;
	*)
	case "$arg" in
	"-"*)
	unknown_option
	;;
	*) # input file/dir - process it
	input_file "$arg" "$#"
	;;
	esac
	;;
	esac
	done

	# If output_file is set we will generate cpio archive and compress it
	# we are careful to delete tmp files
	if [ ! -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}
	fi
	exit 0