usr/gen_initramfs.sh

   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
  12 set -e
  13
  14 usage() {
  15 cat << EOF
  16 Usage:
  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
  30 All options except -o and -l may be repeated and are interpreted
  31 sequentially and immediately.  -u and -g states are preserved across
  32 <cpio_source> options so an explicit "-u 0 -g 0" is required
  33 to reset the root/group mapping.
  34 EOF
  35 }
  36
  37 # awk style field access
  38 # $1 - field number; rest is argument string
  39 field() {
  40         shift $1 ; echo $1
  41 }
  42
  43 filetype() {
  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
  65 print_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 "" >> $cpio_list
  74 }
  75
  76 list_parse() {
  77         if [ -z "$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
  86 parse() {
  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}" >> $cpio_list
 127
 128         return 0
 129 }
 130
 131 unknown_option() {
 132         printf "ERROR: unknown option \"$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
 141 header() {
 142         printf "\n#####################\n# $1\n" >> $cpio_list
 143 }
 144
 145 # process one directory (incl sub-directories)
 146 dir_filelist() {
 147         header "$1"
 148
 149         srcdir=$(echo "$1" | sed -e 's://*:/:g')
 150         dirlist=$(find "${srcdir}" -printf "%p %m %U %G\n" | LANG=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
 164 input_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
 189 prog=$0
 190 root_uid=0
 191 root_gid=0
 192 dep_list=
 193 cpio_list=$(mktemp ${TMPDIR:-/tmp}/cpiolist.XXXXXX)
 194 output="/dev/stdout"
 195
 196 trap "rm -f $cpio_list" EXIT
 197
 198 while [ $# -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 "$arg"
 232                                         ;;
 233                         esac
 234                         ;;
 235         esac
 236 done
 237
 238 # If output_file is set we will generate cpio archive
 239 # we are careful to delete tmp files
 240 timestamp=
 241 if test -n "$KBUILD_BUILD_TIMESTAMP"; then
 242         timestamp="$(date -d"$KBUILD_BUILD_TIMESTAMP" +%s || :)"
 243         if test -n "$timestamp"; then
 244                 timestamp="-t $timestamp"
 245         fi
 246 fi
 247 usr/gen_init_cpio $timestamp $cpio_list > $output