1#!/bin/bash 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 gzip to pack 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 gzipped initramfs file named <file> using 20 gen_init_cpio and gzip 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 echo "$1 \\" 101} 102 103# for each file print a line in following format 104# <filetype> <name> <path to file> <octal mode> <uid> <gid> 105# for links, devices etc the format differs. See gen_init_cpio for details 106parse() { 107 local location="$1" 108 local name="${location/${srcdir}//}" 109 # change '//' into '/' 110 name="${name//\/\///}" 111 local mode="$2" 112 local uid="$3" 113 local gid="$4" 114 local ftype=$(filetype "${location}") 115 # remap uid/gid to 0 if necessary 116 [ "$root_uid" = "squash" ] && uid=0 || [ "$uid" -eq "$root_uid" ] && uid=0 117 [ "$root_gid" = "squash" ] && gid=0 || [ "$gid" -eq "$root_gid" ] && gid=0 118 local str="${mode} ${uid} ${gid}" 119 120 [ "${ftype}" == "invalid" ] && return 0 121 [ "${location}" == "${srcdir}" ] && return 0 122 123 case "${ftype}" in 124 "file") 125 str="${ftype} ${name} ${location} ${str}" 126 ;; 127 "nod") 128 local dev=`LC_ALL=C ls -l "${location}"` 129 local maj=`field 5 ${dev}` 130 local min=`field 6 ${dev}` 131 maj=${maj%,} 132 133 [ -b "${location}" ] && dev="b" || dev="c" 134 135 str="${ftype} ${name} ${str} ${dev} ${maj} ${min}" 136 ;; 137 "slink") 138 local target=`field 11 $(LC_ALL=C ls -l "${location}")` 139 str="${ftype} ${name} ${target} ${str}" 140 ;; 141 *) 142 str="${ftype} ${name} ${str}" 143 ;; 144 esac 145 146 echo "${str}" >> ${output} 147 148 return 0 149} 150 151unknown_option() { 152 printf "ERROR: unknown option \"$arg\"\n" >&2 153 printf "If the filename validly begins with '-', " >&2 154 printf "then it must be prefixed\n" >&2 155 printf "by './' so that it won't be interpreted as an option." >&2 156 printf "\n" >&2 157 usage >&2 158 exit 1 159} 160 161list_header() { 162 : 163} 164 165header() { 166 printf "\n#####################\n# $1\n" >> ${output} 167} 168 169# process one directory (incl sub-directories) 170dir_filelist() { 171 ${dep_list}header "$1" 172 173 srcdir=$(echo "$1" | sed -e 's://*:/:g') 174 dirlist=$(find "${srcdir}" -printf "%p %m %U %G\n") 175 176 # If $dirlist is only one line, then the directory is empty 177 if [ "$(echo "${dirlist}" | wc -l)" -gt 1 ]; then 178 ${dep_list}print_mtime "$1" 179 180 echo "${dirlist}" | \ 181 while read x; do 182 ${dep_list}parse ${x} 183 done 184 fi 185} 186 187# if only one file is specified and it is .cpio file then use it direct as fs 188# if a directory is specified then add all files in given direcotry to fs 189# if a regular file is specified assume it is in gen_initramfs format 190input_file() { 191 source="$1" 192 if [ -f "$1" ]; then 193 ${dep_list}header "$1" 194 is_cpio="$(echo "$1" | sed 's/^.*\.cpio\(\..*\)\?/cpio/')" 195 if [ $2 -eq 0 -a ${is_cpio} == "cpio" ]; then 196 cpio_file=$1 197 echo "$1" | grep -q '^.*\.cpio\..*' && is_cpio_compressed="compressed" 198 [ ! -z ${dep_list} ] && echo "$1" 199 return 0 200 fi 201 if [ -z ${dep_list} ]; then 202 print_mtime "$1" >> ${output} 203 cat "$1" >> ${output} 204 else 205 cat "$1" | while read type dir file perm ; do 206 if [ "$type" == "file" ]; then 207 echo "$file \\"; 208 fi 209 done 210 fi 211 elif [ -d "$1" ]; then 212 dir_filelist "$1" 213 else 214 echo " ${prog}: Cannot open '$1'" >&2 215 exit 1 216 fi 217} 218 219prog=$0 220root_uid=0 221root_gid=0 222dep_list= 223cpio_file= 224cpio_list= 225output="/dev/stdout" 226output_file="" 227is_cpio_compressed= 228 229arg="$1" 230case "$arg" in 231 "-l") # files included in initramfs - used by kbuild 232 dep_list="list_" 233 echo "deps_initramfs := \\" 234 shift 235 ;; 236 "-o") # generate gzipped cpio image named $1 237 shift 238 output_file="$1" 239 cpio_list="$(mktemp ${TMPDIR:-/tmp}/cpiolist.XXXXXX)" 240 output=${cpio_list} 241 shift 242 ;; 243esac 244while [ $# -gt 0 ]; do 245 arg="$1" 246 shift 247 case "$arg" in 248 "-u") # map $1 to uid=0 (root) 249 root_uid="$1" 250 shift 251 ;; 252 "-g") # map $1 to gid=0 (root) 253 root_gid="$1" 254 shift 255 ;; 256 "-d") # display default initramfs list 257 default_list="$arg" 258 ${dep_list}default_initramfs 259 ;; 260 "-h") 261 usage 262 exit 0 263 ;; 264 *) 265 case "$arg" in 266 "-"*) 267 unknown_option 268 ;; 269 *) # input file/dir - process it 270 input_file "$arg" "$#" 271 ;; 272 esac 273 ;; 274 esac 275done 276 277# If output_file is set we will generate cpio archive and gzip it 278# we are carefull to delete tmp files 279if [ ! -z ${output_file} ]; then 280 if [ -z ${cpio_file} ]; then 281 cpio_tfile="$(mktemp ${TMPDIR:-/tmp}/cpiofile.XXXXXX)" 282 usr/gen_init_cpio ${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} | gzip -f -9 - > ${output_file} 291 fi 292 [ -z ${cpio_file} ] && rm ${cpio_tfile} 293fi 294exit 0 295