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>
  23                        is a directory.
  24         -g <gid>       Group ID to map to group ID 0 (root).
  25                        <gid> is only meaningful if <cpio_source>
  26                        is a directory.
  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 list_default_initramfs() {
  40         # echo usr/kinit/kinit
  41         :
  42 }
  43
  44 default_initramfs() {
  45         cat <<-EOF >> ${output}
  46                 # This is a very simple, default initramfs
  47
  48                 dir /dev 0755 0 0
  49                 nod /dev/console 0600 0 0 c 5 1
  50                 dir /root 0700 0 0
  51                 # file /kinit usr/kinit/kinit 0755 0 0
  52                 # slink /init kinit 0755 0 0
  53         EOF
  54 }
  55
  56 filetype() {
  57         local argv1="$1"
  58
  59         # symlink test must come before file test
  60         if [ -L "${argv1}" ]; then
  61                 echo "slink"
  62         elif [ -f "${argv1}" ]; then
  63                 echo "file"
  64         elif [ -d "${argv1}" ]; then
  65                 echo "dir"
  66         elif [ -b "${argv1}" -o -c "${argv1}" ]; then
  67                 echo "nod"
  68         elif [ -p "${argv1}" ]; then
  69                 echo "pipe"
  70         elif [ -S "${argv1}" ]; then
  71                 echo "sock"
  72         else
  73                 echo "invalid"
  74         fi
  75         return 0
  76 }
  77
  78 list_print_mtime() {
  79         :
  80 }
  81
  82 print_mtime() {
  83         local my_mtime="0"
  84
  85         if [ -e "$1" ]; then
  86                 my_mtime=$(find "$1" -printf "%T@\n" | sort -r | head -n 1)
  87         fi
  88
  89         echo "# Last modified: ${my_mtime}" >> ${output}
  90         echo "" >> ${output}
  91 }
  92
  93 list_parse() {
  94         echo "$1 \\"
  95 }
  96
  97 # for each file print a line in following format
  98 # <filetype> <name> <path to file> <octal mode> <uid> <gid>
  99 # for links, devices etc the format differs. See gen_init_cpio for details
 100 parse() {
 101         local location="$1"
 102         local name="${location/${srcdir}//}"
 103         # change '//' into '/'
 104         name="${name//\/\///}"
 105         local mode="$2"
 106         local uid="$3"
 107         local gid="$4"
 108         local ftype=$(filetype "${location}")
 109         # remap uid/gid to 0 if necessary
 110         [ "$uid" -eq "$root_uid" ] && uid=0
 111         [ "$gid" -eq "$root_gid" ] && gid=0
 112         local str="${mode} ${uid} ${gid}"
 113
 114         [ "${ftype}" == "invalid" ] && return 0
 115         [ "${location}" == "${srcdir}" ] && return 0
 116
 117         case "${ftype}" in
 118                 "file")
 119                         str="${ftype} ${name} ${location} ${str}"
 120                         ;;
 121                 "nod")
 122                         local dev_type=
 123                         local maj=$(LC_ALL=C ls -l "${location}" | \
 124                                         gawk '{sub(/,/, "", $5); print $5}')
 125                         local min=$(LC_ALL=C ls -l "${location}" | \
 126                                         gawk '{print $6}')
 127
 128                         if [ -b "${location}" ]; then
 129                                 dev_type="b"
 130                         else
 131                                 dev_type="c"
 132                         fi
 133                         str="${ftype} ${name} ${str} ${dev_type} ${maj} ${min}"
 134                         ;;
 135                 "slink")
 136                         local target=$(LC_ALL=C ls -l "${location}" | \
 137                                         gawk '{print $11}')
 138                         str="${ftype} ${name} ${target} ${str}"
 139                         ;;
 140                 *)
 141                         str="${ftype} ${name} ${str}"
 142                         ;;
 143         esac
 144
 145         echo "${str}" >> ${output}
 146
 147         return 0
 148 }
 149
 150 unknown_option() {
 151         printf "ERROR: unknown option \"$arg\"\n" >&2
 152         printf "If the filename validly begins with '-', " >&2
 153         printf "then it must be prefixed\n" >&2
 154         printf "by './' so that it won't be interpreted as an option." >&2
 155         printf "\n" >&2
 156         usage >&2
 157         exit 1
 158 }
 159
 160 list_header() {
 161         echo "deps_initramfs := \\"
 162 }
 163
 164 header() {
 165         printf "\n#####################\n# $1\n" >> ${output}
 166 }
 167
 168 # process one directory (incl sub-directories)
 169 dir_filelist() {
 170         ${dep_list}header "$1"
 171
 172         srcdir=$(echo "$1" | sed -e 's://*:/:g')
 173         dirlist=$(find "${srcdir}" -printf "%p %m %U %G\n" 2>/dev/null)
 174
 175         # If $dirlist is only one line, then the directory is empty
 176         if [  "$(echo "${dirlist}" | wc -l)" -gt 1 ]; then
 177                 ${dep_list}print_mtime "$1"
 178
 179                 echo "${dirlist}" | \
 180                 while read x; do
 181                         ${dep_list}parse ${x}
 182                 done
 183         fi
 184 }
 185
 186 # if only one file is specified and it is .cpio file then use it direct as fs
 187 # if a directory is specified then add all files in given direcotry to fs
 188 # if a regular file is specified assume it is in gen_initramfs format
 189 input_file() {
 190         source="$1"
 191         if [ -f "$1" ]; then
 192                 ${dep_list}header "$1"
 193                 is_cpio="$(echo "$1" | sed 's/^.*\.cpio/cpio/')"
 194                 if [ $2 -eq 0 -a ${is_cpio} == "cpio" ]; then
 195                         cpio_file=$1
 196                         [ ! -z ${dep_list} ] && echo "$1"
 197                         return 0
 198                 fi
 199                 if [ -z ${dep_list} ]; then
 200                         print_mtime "$1" >> ${output}
 201                         cat "$1"         >> ${output}
 202                 else
 203                         grep ^file "$1" | cut -d ' ' -f 3
 204                 fi
 205         elif [ -d "$1" ]; then
 206                 dir_filelist "$1"
 207         else
 208                 echo "  ${prog}: Cannot open '$1'" >&2
 209                 exit 1
 210         fi
 211 }
 212
 213 prog=$0
 214 root_uid=0
 215 root_gid=0
 216 dep_list=
 217 cpio_file=
 218 cpio_list=
 219 output="/dev/stdout"
 220 output_file=""
 221
 222 arg="$1"
 223 case "$arg" in
 224         "-l")   # files included in initramfs - used by kbuild
 225                 dep_list="list_"
 226                 shift
 227                 ;;
 228         "-o")   # generate gzipped cpio image named $1
 229                 shift
 230                 output_file="$1"
 231                 cpio_list="$(mktemp ${TMPDIR:-/tmp}/cpiolist.XXXXXX)"
 232                 output=${cpio_list}
 233                 shift
 234                 ;;
 235 esac
 236 while [ $# -gt 0 ]; do
 237         arg="$1"
 238         shift
 239         case "$arg" in
 240                 "-u")   # map $1 to uid=0 (root)
 241                         root_uid="$1"
 242                         shift
 243                         ;;
 244                 "-g")   # map $1 to gid=0 (root)
 245                         root_gid="$1"
 246                         shift
 247                         ;;
 248                 "-d")   # display default initramfs list
 249                         default_list="$arg"
 250                         ${dep_list}default_initramfs
 251                         ;;
 252                 "-h")
 253                         usage
 254                         exit 0
 255                         ;;
 256                 *)
 257                         case "$arg" in
 258                                 "-"*)
 259                                         unknown_option
 260                                         ;;
 261                                 *)      # input file/dir - process it
 262                                         input_file "$arg" "$#"
 263                                         ;;
 264                         esac
 265                         ;;
 266         esac
 267 done
 268
 269 # If output_file is set we will generate cpio archive and gzip it
 270 # we are carefull to delete tmp files
 271 if [ ! -z ${output_file} ]; then
 272         if [ -z ${cpio_file} ]; then
 273                 cpio_tfile="$(mktemp ${TMPDIR:-/tmp}/cpiofile.XXXXXX)"
 274                 usr/gen_init_cpio ${cpio_list} > ${cpio_tfile}
 275         else
 276                 cpio_tfile=${cpio_file}
 277         fi
 278         rm ${cpio_list}
 279         cat ${cpio_tfile} | gzip -f -9 - > ${output_file}
 280         [ -z ${cpio_file} ] && rm ${cpio_tfile}
 281 fi
 282 exit 0