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