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>] [-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 -u <uid> User ID to map to user ID 0 (root). 22 <uid> is only meaningful if <cpio_source> is a 23 directory. "squash" forces all files to uid 0. 24 -g <gid> Group ID to map to group ID 0 (root). 25 <gid> is only meaningful if <cpio_source> is a 26 directory. "squash" forces all files to gid 0. 27 <cpio_source> File list or directory for cpio archive. 28 If <cpio_source> is a .cpio file it will be used 29 as direct input to initramfs. 30 -d Output the default cpio list. 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 45list_default_initramfs() { 46 # echo usr/kinit/kinit 47 : 48} 49 50default_initramfs() { 51 cat <<-EOF >> ${output} 52 # This is a very simple, default initramfs 53 54 dir /dev 0755 0 0 55 nod /dev/console 0600 0 0 c 5 1 56 dir /root 0700 0 0 57 # file /kinit usr/kinit/kinit 0755 0 0 58 # slink /init kinit 0755 0 0 59 EOF 60} 61 62filetype() { 63 local argv1="$1" 64 65 # symlink test must come before file test 66 if [ -L "${argv1}" ]; then 67 echo "slink" 68 elif [ -f "${argv1}" ]; then 69 echo "file" 70 elif [ -d "${argv1}" ]; then 71 echo "dir" 72 elif [ -b "${argv1}" -o -c "${argv1}" ]; then 73 echo "nod" 74 elif [ -p "${argv1}" ]; then 75 echo "pipe" 76 elif [ -S "${argv1}" ]; then 77 echo "sock" 78 else 79 echo "invalid" 80 fi 81 return 0 82} 83 84list_print_mtime() { 85 : 86} 87 88print_mtime() { 89 local my_mtime="0" 90 91 if [ -e "$1" ]; then 92 my_mtime=$(find "$1" -printf "%T@\n" | sort -r | head -n 1) 93 fi 94 95 echo "# Last modified: ${my_mtime}" >> ${output} 96 echo "" >> ${output} 97} 98 99list_parse() { 100 if [ -L "$1" ]; then 101 return 102 fi 103 echo "$1" | sed 's/:/\\:/g; s/$/ \\/' 104} 105 106# for each file print a line in following format 107# <filetype> <name> <path to file> <octal mode> <uid> <gid> 108# for links, devices etc the format differs. See gen_init_cpio for details 109parse() { 110 local location="$1" 111 local name="/${location#${srcdir}}" 112 # change '//' into '/' 113 name=$(echo "$name" | sed -e 's://*:/:g') 114 local mode="$2" 115 local uid="$3" 116 local gid="$4" 117 local ftype=$(filetype "${location}") 118 # remap uid/gid to 0 if necessary 119 [ "$root_uid" = "squash" ] && uid=0 || [ "$uid" -eq "$root_uid" ] && uid=0 120 [ "$root_gid" = "squash" ] && gid=0 || [ "$gid" -eq "$root_gid" ] && gid=0 121 local str="${mode} ${uid} ${gid}" 122 123 [ "${ftype}" = "invalid" ] && return 0 124 [ "${location}" = "${srcdir}" ] && return 0 125 126 case "${ftype}" in 127 "file") 128 str="${ftype} ${name} ${location} ${str}" 129 ;; 130 "nod") 131 local dev=`LC_ALL=C ls -l "${location}"` 132 local maj=`field 5 ${dev}` 133 local min=`field 6 ${dev}` 134 maj=${maj%,} 135 136 [ -b "${location}" ] && dev="b" || dev="c" 137 138 str="${ftype} ${name} ${str} ${dev} ${maj} ${min}" 139 ;; 140 "slink") 141 local target=`readlink "${location}"` 142 str="${ftype} ${name} ${target} ${str}" 143 ;; 144 *) 145 str="${ftype} ${name} ${str}" 146 ;; 147 esac 148 149 echo "${str}" >> ${output} 150 151 return 0 152} 153 154unknown_option() { 155 printf "ERROR: unknown option \"$arg\"\n" >&2 156 printf "If the filename validly begins with '-', " >&2 157 printf "then it must be prefixed\n" >&2 158 printf "by './' so that it won't be interpreted as an option." >&2 159 printf "\n" >&2 160 usage >&2 161 exit 1 162} 163 164list_header() { 165 : 166} 167 168header() { 169 printf "\n#####################\n# $1\n" >> ${output} 170} 171 172# process one directory (incl sub-directories) 173dir_filelist() { 174 ${dep_list}header "$1" 175 176 srcdir=$(echo "$1" | sed -e 's://*:/:g') 177 dirlist=$(find "${srcdir}" -printf "%p %m %U %G\n" | sort) 178 179 # If $dirlist is only one line, then the directory is empty 180 if [ "$(echo "${dirlist}" | wc -l)" -gt 1 ]; then 181 ${dep_list}print_mtime "$1" 182 183 echo "${dirlist}" | \ 184 while read x; do 185 ${dep_list}parse ${x} 186 done 187 fi 188} 189 190# if only one file is specified and it is .cpio file then use it direct as fs 191# if a directory is specified then add all files in given direcotry to fs 192# if a regular file is specified assume it is in gen_initramfs format 193input_file() { 194 source="$1" 195 if [ -f "$1" ]; then 196 ${dep_list}header "$1" 197 is_cpio="$(echo "$1" | sed 's/^.*\.cpio\(\..*\)\{0,1\}/cpio/')" 198 if [ $2 -eq 0 -a ${is_cpio} = "cpio" ]; then 199 cpio_file=$1 200 echo "$1" | grep -q '^.*\.cpio\..*' && is_cpio_compressed="compressed" 201 [ ! -z ${dep_list} ] && echo "$1" 202 return 0 203 fi 204 if [ -z ${dep_list} ]; then 205 print_mtime "$1" >> ${output} 206 cat "$1" >> ${output} 207 else 208 echo "$1 \\" 209 cat "$1" | while read type dir file perm ; do 210 if [ "$type" = "file" ]; then 211 echo "$file \\"; 212 fi 213 done 214 fi 215 elif [ -d "$1" ]; then 216 dir_filelist "$1" 217 else 218 echo " ${prog}: Cannot open '$1'" >&2 219 exit 1 220 fi 221} 222 223prog=$0 224root_uid=0 225root_gid=0 226dep_list= 227cpio_file= 228cpio_list= 229output="/dev/stdout" 230output_file="" 231is_cpio_compressed= 232compr="gzip -n -9 -f" 233 234arg="$1" 235case "$arg" in 236 "-l") # files included in initramfs - used by kbuild 237 dep_list="list_" 238 echo "deps_initramfs := $0 \\" 239 shift 240 ;; 241 "-o") # generate compressed cpio image named $1 242 shift 243 output_file="$1" 244 cpio_list="$(mktemp ${TMPDIR:-/tmp}/cpiolist.XXXXXX)" 245 output=${cpio_list} 246 echo "$output_file" | grep -q "\.gz$" \ 247 && [ -x "`which gzip 2> /dev/null`" ] \ 248 && compr="gzip -n -9 -f" 249 echo "$output_file" | grep -q "\.bz2$" \ 250 && [ -x "`which bzip2 2> /dev/null`" ] \ 251 && compr="bzip2 -9 -f" 252 echo "$output_file" | grep -q "\.lzma$" \ 253 && [ -x "`which lzma 2> /dev/null`" ] \ 254 && compr="lzma -9 -f" 255 echo "$output_file" | grep -q "\.xz$" \ 256 && [ -x "`which xz 2> /dev/null`" ] \ 257 && compr="xz --check=crc32 --lzma2=dict=1MiB" 258 echo "$output_file" | grep -q "\.lzo$" \ 259 && [ -x "`which lzop 2> /dev/null`" ] \ 260 && compr="lzop -9 -f" 261 echo "$output_file" | grep -q "\.lz4$" \ 262 && [ -x "`which lz4 2> /dev/null`" ] \ 263 && compr="lz4 -l -9 -f" 264 echo "$output_file" | grep -q "\.cpio$" && compr="cat" 265 shift 266 ;; 267esac 268while [ $# -gt 0 ]; do 269 arg="$1" 270 shift 271 case "$arg" in 272 "-u") # map $1 to uid=0 (root) 273 root_uid="$1" 274 [ "$root_uid" = "-1" ] && root_uid=$(id -u || echo 0) 275 shift 276 ;; 277 "-g") # map $1 to gid=0 (root) 278 root_gid="$1" 279 [ "$root_gid" = "-1" ] && root_gid=$(id -g || echo 0) 280 shift 281 ;; 282 "-d") # display default initramfs list 283 default_list="$arg" 284 ${dep_list}default_initramfs 285 ;; 286 "-h") 287 usage 288 exit 0 289 ;; 290 *) 291 case "$arg" in 292 "-"*) 293 unknown_option 294 ;; 295 *) # input file/dir - process it 296 input_file "$arg" "$#" 297 ;; 298 esac 299 ;; 300 esac 301done 302 303# If output_file is set we will generate cpio archive and compress it 304# we are careful to delete tmp files 305if [ ! -z ${output_file} ]; then 306 if [ -z ${cpio_file} ]; then 307 timestamp= 308 if test -n "$KBUILD_BUILD_TIMESTAMP"; then 309 timestamp="$(date -d"$KBUILD_BUILD_TIMESTAMP" +%s || :)" 310 if test -n "$timestamp"; then 311 timestamp="-t $timestamp" 312 fi 313 fi 314 cpio_tfile="$(mktemp ${TMPDIR:-/tmp}/cpiofile.XXXXXX)" 315 usr/gen_init_cpio $timestamp ${cpio_list} > ${cpio_tfile} 316 else 317 cpio_tfile=${cpio_file} 318 fi 319 rm ${cpio_list} 320 if [ "${is_cpio_compressed}" = "compressed" ]; then 321 cat ${cpio_tfile} > ${output_file} 322 else 323 (cat ${cpio_tfile} | ${compr} - > ${output_file}) \ 324 || (rm -f ${output_file} ; false) 325 fi 326 [ -z ${cpio_file} ] && rm ${cpio_tfile} 327fi 328exit 0 329