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git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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9e6e0d5f2a
kbuild runs "find" on each entry in CONFIG_INITRAMFS_SOURCE that is a directory. The order of the file listing output by "find" matter for build reproducability, hence this patch applies "sort" to get deterministic results. Without this patch, two different machines with identical initramfs directory input may produce differing initramfs cpio archives (different hash) due to the different order of the files within the archive. Signed-off-by: Bjørn Forsman <bjorn.forsman@gmail.com> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
326 lines
7.9 KiB
Bash
Executable file
326 lines
7.9 KiB
Bash
Executable file
#!/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, and then compresses it.
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# The script may also be used to generate the inputfile used for gen_init_cpio
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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>] [-u <uid>] [-g <gid>] {-d | <cpio_source>} ...
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-o <file> Create compressed initramfs file named <file> using
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gen_init_cpio and compressor depending on the extension
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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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-d Output the default cpio list.
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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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list_default_initramfs() {
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# echo usr/kinit/kinit
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:
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}
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default_initramfs() {
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cat <<-EOF >> ${output}
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# This is a very simple, default initramfs
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dir /dev 0755 0 0
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nod /dev/console 0600 0 0 c 5 1
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dir /root 0700 0 0
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# file /kinit usr/kinit/kinit 0755 0 0
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# slink /init kinit 0755 0 0
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EOF
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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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list_print_mtime() {
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:
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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}" >> ${output}
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echo "" >> ${output}
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}
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list_parse() {
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if [ -L "$1" ]; then
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return
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fi
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echo "$1" | sed 's/:/\\:/g; s/$/ \\/'
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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}" >> ${output}
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return 0
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}
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unknown_option() {
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printf "ERROR: unknown option \"$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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list_header() {
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:
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}
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header() {
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printf "\n#####################\n# $1\n" >> ${output}
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}
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# process one directory (incl sub-directories)
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dir_filelist() {
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${dep_list}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" | sort)
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# If $dirlist is only one line, then the directory is empty
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if [ "$(echo "${dirlist}" | wc -l)" -gt 1 ]; then
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${dep_list}print_mtime "$1"
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echo "${dirlist}" | \
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while read x; do
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${dep_list}parse ${x}
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done
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fi
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}
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# if only one file is specified and it is .cpio file then use it direct as fs
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# if a directory is specified then add all files in given direcotry to fs
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# if a regular file is specified assume it is in gen_initramfs format
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input_file() {
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source="$1"
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if [ -f "$1" ]; then
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${dep_list}header "$1"
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is_cpio="$(echo "$1" | sed 's/^.*\.cpio\(\..*\)\?/cpio/')"
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if [ $2 -eq 0 -a ${is_cpio} = "cpio" ]; then
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cpio_file=$1
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echo "$1" | grep -q '^.*\.cpio\..*' && is_cpio_compressed="compressed"
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[ ! -z ${dep_list} ] && echo "$1"
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return 0
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fi
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if [ -z ${dep_list} ]; then
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print_mtime "$1" >> ${output}
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cat "$1" >> ${output}
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else
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echo "$1 \\"
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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 \\";
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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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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_file=
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cpio_list=
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output="/dev/stdout"
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output_file=""
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is_cpio_compressed=
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compr="gzip -n -9 -f"
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arg="$1"
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case "$arg" in
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"-l") # files included in initramfs - used by kbuild
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dep_list="list_"
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echo "deps_initramfs := $0 \\"
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shift
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;;
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"-o") # generate compressed cpio image named $1
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shift
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output_file="$1"
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cpio_list="$(mktemp ${TMPDIR:-/tmp}/cpiolist.XXXXXX)"
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output=${cpio_list}
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echo "$output_file" | grep -q "\.gz$" \
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&& [ -x "`which gzip 2> /dev/null`" ] \
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&& compr="gzip -n -9 -f"
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echo "$output_file" | grep -q "\.bz2$" \
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&& [ -x "`which bzip2 2> /dev/null`" ] \
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&& compr="bzip2 -9 -f"
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echo "$output_file" | grep -q "\.lzma$" \
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&& [ -x "`which lzma 2> /dev/null`" ] \
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&& compr="lzma -9 -f"
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echo "$output_file" | grep -q "\.xz$" \
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&& [ -x "`which xz 2> /dev/null`" ] \
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&& compr="xz --check=crc32 --lzma2=dict=1MiB"
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echo "$output_file" | grep -q "\.lzo$" \
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&& [ -x "`which lzop 2> /dev/null`" ] \
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&& compr="lzop -9 -f"
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echo "$output_file" | grep -q "\.lz4$" \
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&& [ -x "`which lz4 2> /dev/null`" ] \
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&& compr="lz4 -l -9 -f"
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echo "$output_file" | grep -q "\.cpio$" && compr="cat"
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shift
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;;
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esac
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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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"-u") # map $1 to uid=0 (root)
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root_uid="$1"
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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="$1"
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shift
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;;
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"-d") # display default initramfs list
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default_list="$arg"
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${dep_list}default_initramfs
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;;
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"-h")
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usage
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exit 0
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;;
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*)
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case "$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 and compress it
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# we are careful to delete tmp files
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if [ ! -z ${output_file} ]; then
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if [ -z ${cpio_file} ]; then
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timestamp=
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if test -n "$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 $timestamp"
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fi
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fi
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cpio_tfile="$(mktemp ${TMPDIR:-/tmp}/cpiofile.XXXXXX)"
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usr/gen_init_cpio $timestamp ${cpio_list} > ${cpio_tfile}
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else
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cpio_tfile=${cpio_file}
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fi
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rm ${cpio_list}
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if [ "${is_cpio_compressed}" = "compressed" ]; then
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cat ${cpio_tfile} > ${output_file}
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else
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(cat ${cpio_tfile} | ${compr} - > ${output_file}) \
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|| (rm -f ${output_file} ; false)
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fi
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[ -z ${cpio_file} ] && rm ${cpio_tfile}
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fi
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exit 0
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