scripts/gen_initramfs_list.sh

   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
  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 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
  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         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
 106 parse() {
 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} ${min}"
 136                         ;;
 137                 "slink")
 138                         local target=`readlink "${location}"`
 139                         str="${ftype} ${name} ${target} ${str}"
 140                         ;;
 141                 *)
 142                         str="${ftype} ${name} ${str}"
 143                         ;;
 144         esac
 145
 146         echo "${str}" >> ${output}
 147
 148         return 0
 149 }
 150
 151 unknown_option() {
 152         printf "ERROR: unknown option \"$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
 161 list_header() {
 162         :
 163 }
 164
 165 header() {
 166         printf "\n#####################\n# $1\n" >> ${output}
 167 }
 168
 169 # process one directory (incl sub-directories)
 170 dir_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
 190 input_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
 219 prog=$0
 220 root_uid=0
 221 root_gid=0
 222 dep_list=
 223 cpio_file=
 224 cpio_list=
 225 output="/dev/stdout"
 226 output_file=""
 227 is_cpio_compressed=
 228
 229 arg="$1"
 230 case "$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                 ;;
 243 esac
 244 while [ $# -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
 275 done
 276
 277 # If output_file is set we will generate cpio archive and gzip it
 278 # we are carefull to delete tmp files
 279 if [ ! -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}
 293 fi
 294 exit 0