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initramfs.cpio.gz being build in usr/ and included in the kernel was not rebuild when the included files changed. To fix this the following was done: - let gen_initramfs.sh generate a list of files and directories included in the initramfs - gen_initramfs generate the gzipped cpio archive so we could simplify the kbuild file (Makefile) - utilising the kbuild infrastructure so when uid/gid root mapping changes the initramfs will be rebuild With this change we have a much more robust initramfs generation. Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
283 lines
6.3 KiB
Bash
283 lines
6.3 KiB
Bash
#!/bin/bash
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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 gzip to pack 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 gzipped initramfs file named <file> using
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gen_init_cpio and gzip
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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>
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is a directory.
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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>
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is a directory.
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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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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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echo "$1 \\"
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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/${srcdir}//}"
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# change '//' into '/'
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name="${name//\/\///}"
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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 "${location}")
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# remap uid/gid to 0 if necessary
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[ "$uid" -eq "$root_uid" ] && uid=0
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[ "$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} ${str}"
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;;
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"nod")
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local dev_type=
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local maj=$(LC_ALL=C ls -l "${location}" | \
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gawk '{sub(/,/, "", $5); print $5}')
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local min=$(LC_ALL=C ls -l "${location}" | \
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gawk '{print $6}')
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if [ -b "${location}" ]; then
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dev_type="b"
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else
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dev_type="c"
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fi
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str="${ftype} ${name} ${str} ${dev_type} ${maj} ${min}"
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;;
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"slink")
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local target=$(LC_ALL=C ls -l "${location}" | \
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gawk '{print $11}')
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str="${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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echo "deps_initramfs := \\"
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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" 2>/dev/null)
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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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[ ! -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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grep ^file "$1" | cut -d ' ' -f 3
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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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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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shift
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;;
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"-o") # generate gzipped 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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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 gzip it
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# we are carefull to delete tmp files
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if [ ! -z ${output_file} ]; then
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if [ -z ${cpio_file} ]; then
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cpio_tfile="$(mktemp ${TMPDIR:-/tmp}/cpiofile.XXXXXX)"
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usr/gen_init_cpio ${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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cat ${cpio_tfile} | gzip -f -9 - > ${output_file}
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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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