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kbuild: rebuild initramfs if content of initramfs changes
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>
This commit is contained in:
Sam Ravnborg
parent
d9df92e22a
commit
d39a206bc3
2 changed files with 191 additions and 129 deletions
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@ -1,22 +1,55 @@
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#!/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 newline separated list of entries from the file/directory
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# supplied as an argument.
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#
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# If a file/directory is not supplied then generate a small dummy file.
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#
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# The output is suitable for gen_init_cpio built from usr/gen_init_cpio.c.
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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
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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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@ -42,18 +75,28 @@ filetype() {
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return 0
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}
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print_mtime() {
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local argv1="$1"
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local my_mtime="0"
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if [ -e "${argv1}" ]; then
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my_mtime=$(find "${argv1}" -printf "%T@\n" | sort -r | head -n 1)
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fi
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echo "# Last modified: ${my_mtime}"
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echo
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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/${srcdir}//}"
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@ -99,80 +142,112 @@ parse() {
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;;
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esac
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echo "${str}"
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echo "${str}" >> ${output}
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return 0
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}
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usage() {
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printf "Usage:\n"
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printf "$0 [ [-u <root_uid>] [-g <root_gid>] [-d | <cpio_source>] ] . . .\n"
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printf "\n"
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printf -- "-u <root_uid> User ID to map to user ID 0 (root).\n"
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printf " <root_uid> is only meaningful if <cpio_source>\n"
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printf " is a directory.\n"
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printf -- "-g <root_gid> Group ID to map to group ID 0 (root).\n"
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printf " <root_gid> is only meaningful if <cpio_source>\n"
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printf " is a directory.\n"
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printf "<cpio_source> File list or directory for cpio archive.\n"
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printf " If <cpio_source> is not provided then a\n"
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printf " a default list will be output.\n"
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printf -- "-d Output the default cpio list. If no <cpio_source>\n"
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printf " is given then the default cpio list will be output.\n"
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printf "\n"
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printf "All options may be repeated and are interpreted sequentially\n"
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printf "and immediately. -u and -g states are preserved across\n"
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printf "<cpio_source> options so an explicit \"-u 0 -g 0\" is required\n"
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printf "to reset the root/group mapping.\n"
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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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build_list() {
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printf "\n#####################\n# $cpio_source\n"
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list_header() {
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echo "deps_initramfs := \\"
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}
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if [ -f "$cpio_source" ]; then
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print_mtime "$cpio_source"
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cat "$cpio_source"
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elif [ -d "$cpio_source" ]; then
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srcdir=$(echo "$cpio_source" | sed -e 's://*:/:g')
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dirlist=$(find "${srcdir}" -printf "%p %m %U %G\n" 2>/dev/null)
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header() {
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printf "\n#####################\n# $1\n" >> ${output}
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}
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# If $dirlist is only one line, then the directory is empty
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if [ "$(echo "${dirlist}" | wc -l)" -gt 1 ]; then
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print_mtime "$cpio_source"
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echo "${dirlist}" | \
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while read x; do
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parse ${x}
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done
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else
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# Failsafe in case directory is empty
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default_initramfs
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# process one directory (incl sub-directories)
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dir_filelist() {
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${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 " $0: Cannot open '$cpio_source'" >&2
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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")
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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")
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"-g") # map $1 to gid=0 (root)
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root_gid="$1"
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shift
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;;
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"-d")
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"-d") # display default initramfs list
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default_list="$arg"
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default_initramfs
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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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@ -181,23 +256,27 @@ while [ $# -gt 0 ]; do
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*)
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case "$arg" in
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"-"*)
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printf "ERROR: unknown option \"$arg\"\n" >&2
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printf "If the filename validly begins with '-', then it must be prefixed\n" >&2
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printf "by './' so that it won't be interpreted as an option." >&2
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printf "\n" >&2
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usage >&2
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exit 1
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unknown_option
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;;
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*)
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cpio_source="$arg"
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build_list
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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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# spit out the default cpio list if a source hasn't been specified
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[ -z "$cpio_source" -a -z "$default_list" ] && default_initramfs
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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 ${cpio_tfile}
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fi
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exit 0
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89
usr/Makefile
89
usr/Makefile
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@ -1,65 +1,48 @@
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#
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# kbuild file for usr/ - including initramfs image
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#
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klibcdirs:;
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# Generate builtin.o based on initramfs_data.o
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obj-y := initramfs_data.o
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hostprogs-y := gen_init_cpio
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clean-files := initramfs_data.cpio.gz initramfs_list
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# initramfs_data.o contains the initramfs_data.cpio.gz image.
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# The image is included using .incbin, a dependency which is not
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# tracked automatically.
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$(obj)/initramfs_data.o: $(obj)/initramfs_data.cpio.gz FORCE
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ifdef CONFIG_INITRAMFS_ROOT_UID
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gen_initramfs_args += -u $(CONFIG_INITRAMFS_ROOT_UID)
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#####
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# Generate the initramfs cpio archive
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hostprogs-y := gen_init_cpio
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initramfs := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh
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ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \
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$(CONFIG_INITRAMFS_SOURCE),-d)
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ramfs-args := \
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$(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
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$(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID)) \
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$(ramfs-input)
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# .initramfs_data.cpio.gz.d is used to identify all files included
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# in initramfs and to detect if any files are added/removed.
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# Removed files are identified by directory timestamp being updated
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# The dependency list is generated by gen_initramfs.sh -l
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ifneq ($(wildcard $(obj)/.initramfs_data.cpio.gz.d),)
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include $(obj)/.initramfs_data.cpio.gz.d
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endif
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ifdef CONFIG_INITRAMFS_ROOT_GID
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gen_initramfs_args += -g $(CONFIG_INITRAMFS_ROOT_GID)
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endif
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quiet_cmd_initfs = GEN $@
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cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input)
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# The $(shell echo $(CONFIG_INITRAMFS_SOURCE)) is to remove the
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# gratuitous begin and end quotes from the Kconfig string type.
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# Internal, escaped quotes in the Kconfig string will loose the
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# escape and become active quotes.
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quotefixed_initramfs_source := $(shell echo $(CONFIG_INITRAMFS_SOURCE))
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filechk_initramfs_list = $(CONFIG_SHELL) \
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$(srctree)/scripts/gen_initramfs_list.sh $(gen_initramfs_args) $(quotefixed_initramfs_source)
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$(obj)/initramfs_list: $(obj)/Makefile FORCE
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$(call filechk,initramfs_list)
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quiet_cmd_cpio = CPIO $@
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cmd_cpio = ./$< $(obj)/initramfs_list > $@
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# Check if the INITRAMFS_SOURCE is a cpio archive
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ifneq (,$(findstring .cpio,$(quotefixed_initramfs_source)))
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# INITRAMFS_SOURCE has a cpio archive - verify that it's a single file
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ifneq (1,$(words $(quotefixed_initramfs_source)))
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$(error Only a single file may be specified in CONFIG_INITRAMFS_SOURCE (="$(quotefixed_initramfs_source)") when a cpio archive is directly specified.)
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endif
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# Now use the cpio archive directly
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initramfs_data_cpio = $(quotefixed_initramfs_source)
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targets += $(quotefixed_initramfs_source)
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else
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# INITRAMFS_SOURCE is not a cpio archive - create one
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$(obj)/initramfs_data.cpio: $(obj)/gen_init_cpio \
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$(initramfs-y) $(obj)/initramfs_list FORCE
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$(call if_changed,cpio)
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targets += initramfs_data.cpio
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initramfs_data_cpio = $(obj)/initramfs_data.cpio
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endif
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$(obj)/initramfs_data.cpio.gz: $(initramfs_data_cpio) FORCE
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$(call if_changed,gzip)
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targets += initramfs_data.cpio.gz
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targets := initramfs_data.cpio.gz
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$(deps_initramfs): klibcdirs
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# We rebuild initramfs_data.cpio.gz if:
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# 1) Any included file is newer then initramfs_data.cpio.gz
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# 2) There are changes in which files are included (added or deleted)
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# 3) If gen_init_cpio are newer than initramfs_data.cpio.gz
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# 4) arguments to gen_initramfs.sh changes
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$(obj)/initramfs_data.cpio.gz: $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs
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$(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.gz.d
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$(call if_changed,initfs)
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