blob: 0055b07b03b68cafd0bc3c400ee23b686632efbf
| 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 |
| 13 | set -e |
| 14 | |
| 15 | usage() { |
| 16 | cat << EOF |
| 17 | Usage: |
| 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 | |
| 32 | All options except -o and -l may be repeated and are interpreted |
| 33 | sequentially and immediately. -u and -g states are preserved across |
| 34 | <cpio_source> options so an explicit "-u 0 -g 0" is required |
| 35 | to reset the root/group mapping. |
| 36 | EOF |
| 37 | } |
| 38 | |
| 39 | # awk style field access |
| 40 | # $1 - field number; rest is argument string |
| 41 | field() { |
| 42 | shift $1 ; echo $1 |
| 43 | } |
| 44 | |
| 45 | list_default_initramfs() { |
| 46 | # echo usr/kinit/kinit |
| 47 | : |
| 48 | } |
| 49 | |
| 50 | default_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 | |
| 62 | filetype() { |
| 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 | |
| 84 | list_print_mtime() { |
| 85 | : |
| 86 | } |
| 87 | |
| 88 | print_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 | |
| 99 | list_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 |
| 109 | parse() { |
| 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}" >> ${output} |
| 150 | |
| 151 | return 0 |
| 152 | } |
| 153 | |
| 154 | unknown_option() { |
| 155 | printf "ERROR: unknown option \"$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 | |
| 164 | list_header() { |
| 165 | : |
| 166 | } |
| 167 | |
| 168 | header() { |
| 169 | printf "\n#####################\n# $1\n" >> ${output} |
| 170 | } |
| 171 | |
| 172 | # process one directory (incl sub-directories) |
| 173 | dir_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") |
| 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 |
| 193 | input_file() { |
| 194 | source="$1" |
| 195 | if [ -f "$1" ]; then |
| 196 | ${dep_list}header "$1" |
| 197 | is_cpio="$(echo "$1" | sed 's/^.*\.cpio\(\..*\)\?/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 | |
| 223 | prog=$0 |
| 224 | root_uid=0 |
| 225 | root_gid=0 |
| 226 | dep_list= |
| 227 | cpio_file= |
| 228 | cpio_list= |
| 229 | output="/dev/stdout" |
| 230 | output_file="" |
| 231 | is_cpio_compressed= |
| 232 | compr="gzip -n -9 -f" |
| 233 | |
| 234 | arg="$1" |
| 235 | case "$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 | ;; |
| 267 | esac |
| 268 | while [ $# -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 | shift |
| 275 | ;; |
| 276 | "-g") # map $1 to gid=0 (root) |
| 277 | root_gid="$1" |
| 278 | shift |
| 279 | ;; |
| 280 | "-d") # display default initramfs list |
| 281 | default_list="$arg" |
| 282 | ${dep_list}default_initramfs |
| 283 | ;; |
| 284 | "-h") |
| 285 | usage |
| 286 | exit 0 |
| 287 | ;; |
| 288 | *) |
| 289 | case "$arg" in |
| 290 | "-"*) |
| 291 | unknown_option |
| 292 | ;; |
| 293 | *) # input file/dir - process it |
| 294 | input_file "$arg" "$#" |
| 295 | ;; |
| 296 | esac |
| 297 | ;; |
| 298 | esac |
| 299 | done |
| 300 | |
| 301 | # If output_file is set we will generate cpio archive and compress it |
| 302 | # we are careful to delete tmp files |
| 303 | if [ ! -z ${output_file} ]; then |
| 304 | if [ -z ${cpio_file} ]; then |
| 305 | timestamp= |
| 306 | if test -n "$KBUILD_BUILD_TIMESTAMP"; then |
| 307 | timestamp="$(date -d"$KBUILD_BUILD_TIMESTAMP" +%s || :)" |
| 308 | if test -n "$timestamp"; then |
| 309 | timestamp="-t $timestamp" |
| 310 | fi |
| 311 | fi |
| 312 | cpio_tfile="$(mktemp ${TMPDIR:-/tmp}/cpiofile.XXXXXX)" |
| 313 | usr/gen_init_cpio $timestamp ${cpio_list} > ${cpio_tfile} |
| 314 | else |
| 315 | cpio_tfile=${cpio_file} |
| 316 | fi |
| 317 | rm ${cpio_list} |
| 318 | if [ "${is_cpio_compressed}" = "compressed" ]; then |
| 319 | cat ${cpio_tfile} > ${output_file} |
| 320 | else |
| 321 | (cat ${cpio_tfile} | ${compr} - > ${output_file}) \ |
| 322 | || (rm -f ${output_file} ; false) |
| 323 | fi |
| 324 | [ -z ${cpio_file} ] && rm ${cpio_tfile} |
| 325 | fi |
| 326 | exit 0 |
| 327 |