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 -d Output the default cpio list. 32 33All options except -o and -l may be repeated and are interpreted 34sequentially and immediately. -u and -g states are preserved across 35<cpio_source> options so an explicit "-u 0 -g 0" is required 36to reset the root/group mapping. 37EOF 38} 39 40# awk style field access 41# $1 - field number; rest is argument string 42field() { 43 shift $1 ; echo $1 44} 45 46default_initramfs() { 47 cat <<-EOF >> ${output} 48 # This is a very simple, default initramfs 49 50 dir /dev 0755 0 0 51 nod /dev/console 0600 0 0 c 5 1 52 dir /root 0700 0 0 53 # file /kinit usr/kinit/kinit 0755 0 0 54 # slink /init kinit 0755 0 0 55 EOF 56} 57 58filetype() { 59 local argv1="$1" 60 61 # symlink test must come before file test 62 if [ -L "${argv1}" ]; then 63 echo "slink" 64 elif [ -f "${argv1}" ]; then 65 echo "file" 66 elif [ -d "${argv1}" ]; then 67 echo "dir" 68 elif [ -b "${argv1}" -o -c "${argv1}" ]; then 69 echo "nod" 70 elif [ -p "${argv1}" ]; then 71 echo "pipe" 72 elif [ -S "${argv1}" ]; then 73 echo "sock" 74 else 75 echo "invalid" 76 fi 77 return 0 78} 79 80print_mtime() { 81 local my_mtime="0" 82 83 if [ -e "$1" ]; then 84 my_mtime=$(find "$1" -printf "%T@\n" | sort -r | head -n 1) 85 fi 86 87 echo "# Last modified: ${my_mtime}" >> ${output} 88 echo "" >> ${output} 89} 90 91list_parse() { 92 if [ -z "$dep_list" -o -L "$1" ]; then 93 return 94 fi 95 echo "$1" | sed 's/:/\\:/g; s/$/ \\/' >> $dep_list 96} 97 98# for each file print a line in following format 99# <filetype> <name> <path to file> <octal mode> <uid> <gid> 100# for links, devices etc the format differs. See gen_init_cpio for details 101parse() { 102 local location="$1" 103 local name="/${location#${srcdir}}" 104 # change '//' into '/' 105 name=$(echo "$name" | sed -e 's://*:/:g') 106 local mode="$2" 107 local uid="$3" 108 local gid="$4" 109 local ftype=$(filetype "${location}") 110 # remap uid/gid to 0 if necessary 111 [ "$root_uid" = "squash" ] && uid=0 || [ "$uid" -eq "$root_uid" ] && uid=0 112 [ "$root_gid" = "squash" ] && gid=0 || [ "$gid" -eq "$root_gid" ] && gid=0 113 local str="${mode} ${uid} ${gid}" 114 115 [ "${ftype}" = "invalid" ] && return 0 116 [ "${location}" = "${srcdir}" ] && return 0 117 118 case "${ftype}" in 119 "file") 120 str="${ftype} ${name} ${location} ${str}" 121 ;; 122 "nod") 123 local dev="`LC_ALL=C ls -l "${location}"`" 124 local maj=`field 5 ${dev}` 125 local min=`field 6 ${dev}` 126 maj=${maj%,} 127 128 [ -b "${location}" ] && dev="b" || dev="c" 129 130 str="${ftype} ${name} ${str} ${dev} ${maj} ${min}" 131 ;; 132 "slink") 133 local target=`readlink "${location}"` 134 str="${ftype} ${name} ${target} ${str}" 135 ;; 136 *) 137 str="${ftype} ${name} ${str}" 138 ;; 139 esac 140 141 echo "${str}" >> ${output} 142 143 return 0 144} 145 146unknown_option() { 147 printf "ERROR: unknown option \"$arg\"\n" >&2 148 printf "If the filename validly begins with '-', " >&2 149 printf "then it must be prefixed\n" >&2 150 printf "by './' so that it won't be interpreted as an option." >&2 151 printf "\n" >&2 152 usage >&2 153 exit 1 154} 155 156header() { 157 printf "\n#####################\n# $1\n" >> ${output} 158} 159 160# process one directory (incl sub-directories) 161dir_filelist() { 162 header "$1" 163 164 srcdir=$(echo "$1" | sed -e 's://*:/:g') 165 dirlist=$(find "${srcdir}" -printf "%p %m %U %G\n" | LANG=C sort) 166 167 # If $dirlist is only one line, then the directory is empty 168 if [ "$(echo "${dirlist}" | wc -l)" -gt 1 ]; then 169 print_mtime "$1" 170 171 echo "${dirlist}" | \ 172 while read x; do 173 list_parse $x 174 parse $x 175 done 176 fi 177} 178 179# if only one file is specified and it is .cpio file then use it direct as fs 180# if a directory is specified then add all files in given direcotry to fs 181# if a regular file is specified assume it is in gen_init_cpio format 182input_file() { 183 source="$1" 184 if [ -f "$1" ]; then 185 header "$1" 186 is_cpio="$(echo "$1" | sed 's/^.*\.cpio\(\..*\)\{0,1\}/cpio/')" 187 if [ $2 -eq 0 -a ${is_cpio} = "cpio" ]; then 188 cpio_file=$1 189 echo "$1" | grep -q '^.*\.cpio\..*' && is_cpio_compressed="compressed" 190 [ -n "$dep_list" ] && echo "$1" >> $dep_list 191 return 0 192 fi 193 print_mtime "$1" >> ${output} 194 cat "$1" >> ${output} 195 if [ -n "$dep_list" ]; then 196 echo "$1 \\" >> $dep_list 197 cat "$1" | while read type dir file perm ; do 198 if [ "$type" = "file" ]; then 199 echo "$file \\" >> $dep_list 200 fi 201 done 202 fi 203 elif [ -d "$1" ]; then 204 dir_filelist "$1" 205 else 206 echo " ${prog}: Cannot open '$1'" >&2 207 exit 1 208 fi 209} 210 211prog=$0 212root_uid=0 213root_gid=0 214dep_list= 215cpio_file= 216cpio_list= 217output="/dev/stdout" 218output_file="" 219is_cpio_compressed= 220compr="gzip -n -9 -f" 221 222while [ $# -gt 0 ]; do 223 arg="$1" 224 shift 225 case "$arg" in 226 "-l") # files included in initramfs - used by kbuild 227 dep_list="$1" 228 echo "deps_initramfs := \\" > $dep_list 229 shift 230 ;; 231 "-o") # generate compressed cpio image named $1 232 output_file="$1" 233 cpio_list="$(mktemp ${TMPDIR:-/tmp}/cpiolist.XXXXXX)" 234 output=${cpio_list} 235 echo "$output_file" | grep -q "\.gz$" \ 236 && [ -x "`which gzip 2> /dev/null`" ] \ 237 && compr="gzip -n -9 -f" 238 echo "$output_file" | grep -q "\.bz2$" \ 239 && [ -x "`which bzip2 2> /dev/null`" ] \ 240 && compr="bzip2 -9 -f" 241 echo "$output_file" | grep -q "\.lzma$" \ 242 && [ -x "`which lzma 2> /dev/null`" ] \ 243 && compr="lzma -9 -f" 244 echo "$output_file" | grep -q "\.xz$" \ 245 && [ -x "`which xz 2> /dev/null`" ] \ 246 && compr="xz --check=crc32 --lzma2=dict=1MiB" 247 echo "$output_file" | grep -q "\.lzo$" \ 248 && [ -x "`which lzop 2> /dev/null`" ] \ 249 && compr="lzop -9 -f" 250 echo "$output_file" | grep -q "\.lz4$" \ 251 && [ -x "`which lz4 2> /dev/null`" ] \ 252 && compr="lz4 -l -9 -f" 253 echo "$output_file" | grep -q "\.cpio$" && compr="cat" 254 shift 255 ;; 256 "-u") # map $1 to uid=0 (root) 257 root_uid="$1" 258 [ "$root_uid" = "-1" ] && root_uid=$(id -u || echo 0) 259 shift 260 ;; 261 "-g") # map $1 to gid=0 (root) 262 root_gid="$1" 263 [ "$root_gid" = "-1" ] && root_gid=$(id -g || echo 0) 264 shift 265 ;; 266 "-d") # display default initramfs list 267 default_initramfs 268 ;; 269 "-h") 270 usage 271 exit 0 272 ;; 273 *) 274 case "$arg" in 275 "-"*) 276 unknown_option 277 ;; 278 *) # input file/dir - process it 279 input_file "$arg" "$#" 280 ;; 281 esac 282 ;; 283 esac 284done 285 286# If output_file is set we will generate cpio archive and compress it 287# we are careful to delete tmp files 288if [ ! -z ${output_file} ]; then 289 if [ -z ${cpio_file} ]; then 290 timestamp= 291 if test -n "$KBUILD_BUILD_TIMESTAMP"; then 292 timestamp="$(date -d"$KBUILD_BUILD_TIMESTAMP" +%s || :)" 293 if test -n "$timestamp"; then 294 timestamp="-t $timestamp" 295 fi 296 fi 297 cpio_tfile="$(mktemp ${TMPDIR:-/tmp}/cpiofile.XXXXXX)" 298 usr/gen_init_cpio $timestamp ${cpio_list} > ${cpio_tfile} 299 else 300 cpio_tfile=${cpio_file} 301 fi 302 rm ${cpio_list} 303 if [ "${is_cpio_compressed}" = "compressed" ]; then 304 cat ${cpio_tfile} > ${output_file} 305 else 306 (cat ${cpio_tfile} | ${compr} - > ${output_file}) \ 307 || (rm -f ${output_file} ; false) 308 fi 309 [ -z ${cpio_file} ] && rm ${cpio_tfile} 310fi 311exit 0 312