name : gen_initramfs.sh #!/bin/sh # Copyright (C) Martin Schlemmer <azarah@nosferatu.za.org> # Copyright (C) 2006 Sam Ravnborg <sam@ravnborg.org> # # Released under the terms of the GNU GPL # # Generate a cpio packed initramfs. It uses gen_init_cpio to generate # the cpio archive. # This script assumes that gen_init_cpio is located in usr/ directory # error out on errors set -e usage() { cat << EOF Usage: $0 [-o <file>] [-l <dep_list>] [-u <uid>] [-g <gid>] {-d | <cpio_source>} ... -o <file> Create initramfs file named <file> by using gen_init_cpio -l <dep_list> Create dependency list named <dep_list> -u <uid> User ID to map to user ID 0 (root). <uid> is only meaningful if <cpio_source> is a directory. "squash" forces all files to uid 0. -g <gid> Group ID to map to group ID 0 (root). <gid> is only meaningful if <cpio_source> is a directory. "squash" forces all files to gid 0. -d <date> Use date for all file mtime values <cpio_source> File list or directory for cpio archive. If <cpio_source> is a .cpio file it will be used as direct input to initramfs. All options except -o and -l may be repeated and are interpreted sequentially and immediately. -u and -g states are preserved across <cpio_source> options so an explicit "-u 0 -g 0" is required to reset the root/group mapping. EOF } # awk style field access # $1 - field number; rest is argument string field() { shift $1 ; echo $1 } filetype() { local argv1="$1" # symlink test must come before file test if [ -L "${argv1}" ]; then echo "slink" elif [ -f "${argv1}" ]; then echo "file" elif [ -d "${argv1}" ]; then echo "dir" elif [ -b "${argv1}" -o -c "${argv1}" ]; then echo "nod" elif [ -p "${argv1}" ]; then echo "pipe" elif [ -S "${argv1}" ]; then echo "sock" else echo "invalid" fi return 0 } print_mtime() { local my_mtime="0" if [ -e "$1" ]; then my_mtime=$(find "$1" -printf "%T@\n" | sort -r | head -n 1) fi echo "# Last modified: ${my_mtime}" >> $cpio_list echo "" >> $cpio_list } list_parse() { if [ -z "$dep_list" -o -L "$1" ]; then return fi echo "$1" | sed 's/:/\\:/g; s/$/ \\/' >> $dep_list } # for each file print a line in following format # <filetype> <name> <path to file> <octal mode> <uid> <gid> # for links, devices etc the format differs. See gen_init_cpio for details parse() { local location="$1" local name="/${location#${srcdir}}" # change '//' into '/' name=$(echo "$name" | sed -e 's://*:/:g') local mode="$2" local uid="$3" local gid="$4" local ftype=$(filetype "${location}") # remap uid/gid to 0 if necessary [ "$root_uid" = "squash" ] && uid=0 || [ "$uid" -eq "$root_uid" ] && uid=0 [ "$root_gid" = "squash" ] && gid=0 || [ "$gid" -eq "$root_gid" ] && gid=0 local str="${mode} ${uid} ${gid}" [ "${ftype}" = "invalid" ] && return 0 [ "${location}" = "${srcdir}" ] && return 0 case "${ftype}" in "file") str="${ftype} ${name} ${location} ${str}" ;; "nod") local dev="`LC_ALL=C ls -l "${location}"`" local maj=`field 5 ${dev}` local min=`field 6 ${dev}` maj=${maj%,} [ -b "${location}" ] && dev="b" || dev="c" str="${ftype} ${name} ${str} ${dev} ${maj} ${min}" ;; "slink") local target=`readlink "${location}"` str="${ftype} ${name} ${target} ${str}" ;; *) str="${ftype} ${name} ${str}" ;; esac echo "${str}" >> $cpio_list return 0 } unknown_option() { printf "ERROR: unknown option \"$arg\"\n" >&2 printf "If the filename validly begins with '-', " >&2 printf "then it must be prefixed\n" >&2 printf "by './' so that it won't be interpreted as an option." >&2 printf "\n" >&2 usage >&2 exit 1 } header() { printf "\n#####################\n# $1\n" >> $cpio_list } # process one directory (incl sub-directories) dir_filelist() { header "$1" srcdir=$(echo "$1" | sed -e 's://*:/:g') dirlist=$(find "${srcdir}" -printf "%p %m %U %G\n" | LC_ALL=C sort) # If $dirlist is only one line, then the directory is empty if [ "$(echo "${dirlist}" | wc -l)" -gt 1 ]; then print_mtime "$1" echo "${dirlist}" | \ while read x; do list_parse $x parse $x done fi } input_file() { source="$1" if [ -f "$1" ]; then # If a regular file is specified, assume it is in # gen_init_cpio format header "$1" print_mtime "$1" >> $cpio_list cat "$1" >> $cpio_list if [ -n "$dep_list" ]; then echo "$1 \\" >> $dep_list cat "$1" | while read type dir file perm ; do if [ "$type" = "file" ]; then echo "$file \\" >> $dep_list fi done fi elif [ -d "$1" ]; then # If a directory is specified then add all files in it to fs dir_filelist "$1" else echo " ${prog}: Cannot open '$1'" >&2 exit 1 fi } prog=$0 root_uid=0 root_gid=0 dep_list= timestamp= cpio_list=$(mktemp ${TMPDIR:-/tmp}/cpiolist.XXXXXX) output="/dev/stdout" trap "rm -f $cpio_list" EXIT while [ $# -gt 0 ]; do arg="$1" shift case "$arg" in "-l") # files included in initramfs - used by kbuild dep_list="$1" echo "deps_initramfs := \\" > $dep_list shift ;; "-o") # generate cpio image named $1 output="$1" shift ;; "-u") # map $1 to uid=0 (root) root_uid="$1" [ "$root_uid" = "-1" ] && root_uid=$(id -u || echo 0) shift ;; "-g") # map $1 to gid=0 (root) root_gid="$1" [ "$root_gid" = "-1" ] && root_gid=$(id -g || echo 0) shift ;; "-d") # date for file mtimes timestamp="$(date -d"$1" +%s || :)" if test -n "$timestamp"; then timestamp="-t $timestamp" fi shift ;; "-h") usage exit 0 ;; *) case "$arg" in "-"*) unknown_option ;; *) # input file/dir - process it input_file "$arg" ;; esac ;; esac done # If output_file is set we will generate cpio archive # we are careful to delete tmp files usr/gen_init_cpio $timestamp $cpio_list > $output