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