linux/scripts/gen_initramfs_list.sh
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   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
  13set -e
  14
  15usage() {
  16cat << EOF
  17Usage:
  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
  32All options except -o and -l may be repeated and are interpreted
  33sequentially and immediately.  -u and -g states are preserved across
  34<cpio_source> options so an explicit "-u 0 -g 0" is required
  35to reset the root/group mapping.
  36EOF
  37}
  38
  39# awk style field access
  40# $1 - field number; rest is argument string
  41field() {
  42        shift $1 ; echo $1
  43}
  44
  45list_default_initramfs() {
  46        # echo usr/kinit/kinit
  47        :
  48}
  49
  50default_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
  62filetype() {
  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
  84list_print_mtime() {
  85        :
  86}
  87
  88print_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
  99list_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
 106parse() {
 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=`field 11 $(LC_ALL=C ls -l "${location}")`
 139                        str="${ftype} ${name} ${target} ${str}"
 140                        ;;
 141                *)
 142                        str="${ftype} ${name} ${str}"
 143                        ;;
 144        esac
 145
 146        echo "${str}" >> ${output}
 147
 148        return 0
 149}
 150
 151unknown_option() {
 152        printf "ERROR: unknown option \"$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
 161list_header() {
 162        :
 163}
 164
 165header() {
 166        printf "\n#####################\n# $1\n" >> ${output}
 167}
 168
 169# process one directory (incl sub-directories)
 170dir_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
 190input_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
 219prog=$0
 220root_uid=0
 221root_gid=0
 222dep_list=
 223cpio_file=
 224cpio_list=
 225output="/dev/stdout"
 226output_file=""
 227is_cpio_compressed=
 228
 229arg="$1"
 230case "$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                ;;
 243esac
 244while [ $# -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
 275done
 276
 277# If output_file is set we will generate cpio archive and gzip it
 278# we are carefull to delete tmp files
 279if [ ! -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}
 293fi
 294exit 0
 295
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