1#!/bin/sh 2# Copyright (C) Martin Schlemmer <azarah@nosferatu.za.org> 3# Copyright (C) 2006 Sam Ravnborg <sam@ravnborg.org> 4# 5# Released under the terms of the GNU GPL 6# 7# Generate a cpio packed initramfs. It uses gen_init_cpio to generate 8# the cpio archive, and then compresses it. 9# The script may also be used to generate the inputfile used for gen_init_cpio 10# This script assumes that gen_init_cpio is located in usr/ directory 11 12# error out on errors 13set -e 14 15usage() { 16cat << EOF 17Usage: 18$0 [-o <file>] [-l <dep_list>] [-u <uid>] [-g <gid>] {-d | <cpio_source>} ... 19 -o <file> Create compressed initramfs file named <file> using 20 gen_init_cpio and compressor depending on the extension 21 -l <dep_list> Create dependency list named <dep_list> 22 -u <uid> User ID to map to user ID 0 (root). 23 <uid> is only meaningful if <cpio_source> is a 24 directory. "squash" forces all files to uid 0. 25 -g <gid> Group ID to map to group ID 0 (root). 26 <gid> is only meaningful if <cpio_source> is a 27 directory. "squash" forces all files to gid 0. 28 <cpio_source> File list or directory for cpio archive. 29 If <cpio_source> is a .cpio file it will be used 30 as direct input to initramfs. 31 32All options except -o and -l may be repeated and are interpreted 33sequentially and immediately. -u and -g states are preserved across 34<cpio_source> options so an explicit "-u 0 -g 0" is required 35to reset the root/group mapping. 36EOF 37} 38 39# awk style field access 40# $1 - field number; rest is argument string 41field() { 42 shift $1 ; echo $1 43} 44 45filetype() { 46 local argv1="$1" 47 48 # symlink test must come before file test 49 if [ -L "${argv1}" ]; then 50 echo "slink" 51 elif [ -f "${argv1}" ]; then 52 echo "file" 53 elif [ -d "${argv1}" ]; then 54 echo "dir" 55 elif [ -b "${argv1}" -o -c "${argv1}" ]; then 56 echo "nod" 57 elif [ -p "${argv1}" ]; then 58 echo "pipe" 59 elif [ -S "${argv1}" ]; then 60 echo "sock" 61 else 62 echo "invalid" 63 fi 64 return 0 65} 66 67print_mtime() { 68 local my_mtime="0" 69 70 if [ -e "$1" ]; then 71 my_mtime=$(find "$1" -printf "%T@\n" | sort -r | head -n 1) 72 fi 73 74 echo "# Last modified: ${my_mtime}" >> ${output} 75 echo "" >> ${output} 76} 77 78list_parse() { 79 if [ -z "$dep_list" -o -L "$1" ]; then 80 return 81 fi 82 echo "$1" | sed 's/:/\\:/g; s/$/ \\/' >> $dep_list 83} 84 85# for each file print a line in following format 86# <filetype> <name> <path to file> <octal mode> <uid> <gid> 87# for links, devices etc the format differs. See gen_init_cpio for details 88parse() { 89 local location="$1" 90 local name="/${location#${srcdir}}" 91 # change '//' into '/' 92 name=$(echo "$name" | sed -e 's://*:/:g') 93 local mode="$2" 94 local uid="$3" 95 local gid="$4" 96 local ftype=$(filetype "${location}") 97 # remap uid/gid to 0 if necessary 98 [ "$root_uid" = "squash" ] && uid=0 || [ "$uid" -eq "$root_uid" ] && uid=0 99 [ "$root_gid" = "squash" ] && gid=0 || [ "$gid" -eq "$root_gid" ] && gid=0 100 local str="${mode} ${uid} ${gid}" 101 102 [ "${ftype}" = "invalid" ] && return 0 103 [ "${location}" = "${srcdir}" ] && return 0 104 105 case "${ftype}" in 106 "file") 107 str="${ftype} ${name} ${location} ${str}" 108 ;; 109 "nod") 110 local dev="`LC_ALL=C ls -l "${location}"`" 111 local maj=`field 5 ${dev}` 112 local min=`field 6 ${dev}` 113 maj=${maj%,} 114 115 [ -b "${location}" ] && dev="b" || dev="c" 116 117 str="${ftype} ${name} ${str} ${dev} ${maj} ${min}" 118 ;; 119 "slink") 120 local target=`readlink "${location}"` 121 str="${ftype} ${name} ${target} ${str}" 122 ;; 123 *) 124 str="${ftype} ${name} ${str}" 125 ;; 126 esac 127 128 echo "${str}" >> ${output} 129 130 return 0 131} 132 133unknown_option() { 134 printf "ERROR: unknown option \"$arg\"\n" >&2 135 printf "If the filename validly begins with '-', " >&2 136 printf "then it must be prefixed\n" >&2 137 printf "by './' so that it won't be interpreted as an option." >&2 138 printf "\n" >&2 139 usage >&2 140 exit 1 141} 142 143header() { 144 printf "\n#####################\n# $1\n" >> ${output} 145} 146 147# process one directory (incl sub-directories) 148dir_filelist() { 149 header "$1" 150 151 srcdir=$(echo "$1" | sed -e 's://*:/:g') 152 dirlist=$(find "${srcdir}" -printf "%p %m %U %G\n" | LANG=C sort) 153 154 # If $dirlist is only one line, then the directory is empty 155 if [ "$(echo "${dirlist}" | wc -l)" -gt 1 ]; then 156 print_mtime "$1" 157 158 echo "${dirlist}" | \ 159 while read x; do 160 list_parse $x 161 parse $x 162 done 163 fi 164} 165 166# if only one file is specified and it is .cpio file then use it direct as fs 167# if a directory is specified then add all files in given direcotry to fs 168# if a regular file is specified assume it is in gen_init_cpio format 169input_file() { 170 source="$1" 171 if [ -f "$1" ]; then 172 header "$1" 173 is_cpio="$(echo "$1" | sed 's/^.*\.cpio\(\..*\)\{0,1\}/cpio/')" 174 if [ $2 -eq 0 -a ${is_cpio} = "cpio" ]; then 175 cpio_file=$1 176 echo "$1" | grep -q '^.*\.cpio\..*' && is_cpio_compressed="compressed" 177 [ -n "$dep_list" ] && echo "$1" >> $dep_list 178 return 0 179 fi 180 print_mtime "$1" >> ${output} 181 cat "$1" >> ${output} 182 if [ -n "$dep_list" ]; then 183 echo "$1 \\" >> $dep_list 184 cat "$1" | while read type dir file perm ; do 185 if [ "$type" = "file" ]; then 186 echo "$file \\" >> $dep_list 187 fi 188 done 189 fi 190 elif [ -d "$1" ]; then 191 dir_filelist "$1" 192 else 193 echo " ${prog}: Cannot open '$1'" >&2 194 exit 1 195 fi 196} 197 198prog=$0 199root_uid=0 200root_gid=0 201dep_list= 202cpio_file= 203cpio_list= 204output="/dev/stdout" 205output_file="" 206is_cpio_compressed= 207compr="gzip -n -9 -f" 208 209while [ $# -gt 0 ]; do 210 arg="$1" 211 shift 212 case "$arg" in 213 "-l") # files included in initramfs - used by kbuild 214 dep_list="$1" 215 echo "deps_initramfs := \\" > $dep_list 216 shift 217 ;; 218 "-o") # generate compressed cpio image named $1 219 output_file="$1" 220 cpio_list="$(mktemp ${TMPDIR:-/tmp}/cpiolist.XXXXXX)" 221 output=${cpio_list} 222 echo "$output_file" | grep -q "\.gz$" \ 223 && [ -x "`which gzip 2> /dev/null`" ] \ 224 && compr="gzip -n -9 -f" 225 echo "$output_file" | grep -q "\.bz2$" \ 226 && [ -x "`which bzip2 2> /dev/null`" ] \ 227 && compr="bzip2 -9 -f" 228 echo "$output_file" | grep -q "\.lzma$" \ 229 && [ -x "`which lzma 2> /dev/null`" ] \ 230 && compr="lzma -9 -f" 231 echo "$output_file" | grep -q "\.xz$" \ 232 && [ -x "`which xz 2> /dev/null`" ] \ 233 && compr="xz --check=crc32 --lzma2=dict=1MiB" 234 echo "$output_file" | grep -q "\.lzo$" \ 235 && [ -x "`which lzop 2> /dev/null`" ] \ 236 && compr="lzop -9 -f" 237 echo "$output_file" | grep -q "\.lz4$" \ 238 && [ -x "`which lz4 2> /dev/null`" ] \ 239 && compr="lz4 -l -9 -f" 240 echo "$output_file" | grep -q "\.cpio$" && compr="cat" 241 shift 242 ;; 243 "-u") # map $1 to uid=0 (root) 244 root_uid="$1" 245 [ "$root_uid" = "-1" ] && root_uid=$(id -u || echo 0) 246 shift 247 ;; 248 "-g") # map $1 to gid=0 (root) 249 root_gid="$1" 250 [ "$root_gid" = "-1" ] && root_gid=$(id -g || echo 0) 251 shift 252 ;; 253 "-h") 254 usage 255 exit 0 256 ;; 257 *) 258 case "$arg" in 259 "-"*) 260 unknown_option 261 ;; 262 *) # input file/dir - process it 263 input_file "$arg" "$#" 264 ;; 265 esac 266 ;; 267 esac 268done 269 270# If output_file is set we will generate cpio archive and compress it 271# we are careful to delete tmp files 272if [ ! -z ${output_file} ]; then 273 if [ -z ${cpio_file} ]; then 274 timestamp= 275 if test -n "$KBUILD_BUILD_TIMESTAMP"; then 276 timestamp="$(date -d"$KBUILD_BUILD_TIMESTAMP" +%s || :)" 277 if test -n "$timestamp"; then 278 timestamp="-t $timestamp" 279 fi 280 fi 281 cpio_tfile="$(mktemp ${TMPDIR:-/tmp}/cpiofile.XXXXXX)" 282 usr/gen_init_cpio $timestamp ${cpio_list} > ${cpio_tfile} 283 else 284 cpio_tfile=${cpio_file} 285 fi 286 rm ${cpio_list} 287 if [ "${is_cpio_compressed}" = "compressed" ]; then 288 cat ${cpio_tfile} > ${output_file} 289 else 290 (cat ${cpio_tfile} | ${compr} - > ${output_file}) \ 291 || (rm -f ${output_file} ; false) 292 fi 293 [ -z ${cpio_file} ] && rm ${cpio_tfile} 294fi 295exit 0 296