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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 <[email protected]>
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Sam Ravnborg
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Apr 11, 2006
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,22 +1,55 @@ | ||
| #!/bin/bash | ||
| # Copyright (C) Martin Schlemmer <[email protected]> | ||
| # Released under the terms of the GNU GPL | ||
| # | ||
| # Generate a newline separated list of entries from the file/directory | ||
| # supplied as an argument. | ||
| # | ||
| # If a file/directory is not supplied then generate a small dummy file. | ||
| # Copyright (c) 2006 Sam Ravnborg <[email protected]> | ||
| # | ||
| # The output is suitable for gen_init_cpio built from usr/gen_init_cpio.c. | ||
| # Released under the terms of the GNU GPL | ||
| # | ||
| # Generate a cpio packed initramfs. It uses gen_init_cpio to generate | ||
| # the cpio archive, and gzip to pack it. | ||
| # The script may also be used to generate the inputfile used for gen_init_cpio | ||
| # 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>] [-u <uid>] [-g <gid>] {-d | <cpio_source>} ... | ||
| -o <file> Create gzipped initramfs file named <file> using | ||
| gen_init_cpio and gzip | ||
| -u <uid> User ID to map to user ID 0 (root). | ||
| <uid> is only meaningful if <cpio_source> | ||
| is a directory. | ||
| -g <gid> Group ID to map to group ID 0 (root). | ||
| <gid> is only meaningful if <cpio_source> | ||
| is a directory. | ||
| <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. | ||
| -d Output the default cpio list. | ||
| 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 | ||
| } | ||
|
|
||
| list_default_initramfs() { | ||
| # echo usr/kinit/kinit | ||
| : | ||
| } | ||
|
|
||
| default_initramfs() { | ||
| cat <<-EOF | ||
| cat <<-EOF >> ${output} | ||
| # This is a very simple, default initramfs | ||
| dir /dev 0755 0 0 | ||
| nod /dev/console 0600 0 0 c 5 1 | ||
| dir /root 0700 0 0 | ||
| # file /kinit usr/kinit/kinit 0755 0 0 | ||
| # slink /init kinit 0755 0 0 | ||
| EOF | ||
| } | ||
|
|
||
|
|
@@ -42,18 +75,28 @@ filetype() { | |
| return 0 | ||
| } | ||
|
|
||
| list_print_mtime() { | ||
| : | ||
| } | ||
|
|
||
| print_mtime() { | ||
| local argv1="$1" | ||
| local my_mtime="0" | ||
|
|
||
| if [ -e "${argv1}" ]; then | ||
| my_mtime=$(find "${argv1}" -printf "%T@\n" | sort -r | head -n 1) | ||
| if [ -e "$1" ]; then | ||
| my_mtime=$(find "$1" -printf "%T@\n" | sort -r | head -n 1) | ||
| fi | ||
|
|
||
| echo "# Last modified: ${my_mtime}" | ||
| echo | ||
|
|
||
| echo "# Last modified: ${my_mtime}" >> ${output} | ||
| echo "" >> ${output} | ||
| } | ||
|
|
||
| list_parse() { | ||
| echo "$1 \\" | ||
| } | ||
|
|
||
| # 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/${srcdir}//}" | ||
|
|
@@ -99,80 +142,112 @@ parse() { | |
| ;; | ||
| esac | ||
|
|
||
| echo "${str}" | ||
| echo "${str}" >> ${output} | ||
|
|
||
| return 0 | ||
| } | ||
|
|
||
| usage() { | ||
| printf "Usage:\n" | ||
| printf "$0 [ [-u <root_uid>] [-g <root_gid>] [-d | <cpio_source>] ] . . .\n" | ||
| printf "\n" | ||
| printf -- "-u <root_uid> User ID to map to user ID 0 (root).\n" | ||
| printf " <root_uid> is only meaningful if <cpio_source>\n" | ||
| printf " is a directory.\n" | ||
| printf -- "-g <root_gid> Group ID to map to group ID 0 (root).\n" | ||
| printf " <root_gid> is only meaningful if <cpio_source>\n" | ||
| printf " is a directory.\n" | ||
| printf "<cpio_source> File list or directory for cpio archive.\n" | ||
| printf " If <cpio_source> is not provided then a\n" | ||
| printf " a default list will be output.\n" | ||
| printf -- "-d Output the default cpio list. If no <cpio_source>\n" | ||
| printf " is given then the default cpio list will be output.\n" | ||
| printf "\n" | ||
| printf "All options may be repeated and are interpreted sequentially\n" | ||
| printf "and immediately. -u and -g states are preserved across\n" | ||
| printf "<cpio_source> options so an explicit \"-u 0 -g 0\" is required\n" | ||
| printf "to reset the root/group mapping.\n" | ||
| unknown_option() { | ||
| printf "ERROR: unknown option \"$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 | ||
| } | ||
|
|
||
| list_header() { | ||
| echo "deps_initramfs := \\" | ||
| } | ||
|
|
||
| header() { | ||
| printf "\n#####################\n# $1\n" >> ${output} | ||
| } | ||
|
|
||
| # process one directory (incl sub-directories) | ||
| dir_filelist() { | ||
| ${dep_list}header "$1" | ||
|
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||
| srcdir=$(echo "$1" | sed -e 's://*:/:g') | ||
| dirlist=$(find "${srcdir}" -printf "%p %m %U %G\n" 2>/dev/null) | ||
|
|
||
| # If $dirlist is only one line, then the directory is empty | ||
| if [ "$(echo "${dirlist}" | wc -l)" -gt 1 ]; then | ||
| ${dep_list}print_mtime "$1" | ||
|
|
||
| echo "${dirlist}" | \ | ||
| while read x; do | ||
| ${dep_list}parse ${x} | ||
| done | ||
| fi | ||
| } | ||
|
|
||
| build_list() { | ||
| printf "\n#####################\n# $cpio_source\n" | ||
|
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||
| if [ -f "$cpio_source" ]; then | ||
| print_mtime "$cpio_source" | ||
| cat "$cpio_source" | ||
| elif [ -d "$cpio_source" ]; then | ||
| srcdir=$(echo "$cpio_source" | sed -e 's://*:/:g') | ||
| dirlist=$(find "${srcdir}" -printf "%p %m %U %G\n" 2>/dev/null) | ||
|
|
||
| # If $dirlist is only one line, then the directory is empty | ||
| if [ "$(echo "${dirlist}" | wc -l)" -gt 1 ]; then | ||
| print_mtime "$cpio_source" | ||
|
|
||
| echo "${dirlist}" | \ | ||
| while read x; do | ||
| parse ${x} | ||
| done | ||
| # if only one file is specified and it is .cpio file then use it direct as fs | ||
| # if a directory is specified then add all files in given direcotry to fs | ||
| # if a regular file is specified assume it is in gen_initramfs format | ||
| input_file() { | ||
| source="$1" | ||
| if [ -f "$1" ]; then | ||
| ${dep_list}header "$1" | ||
| is_cpio="$(echo "$1" | sed 's/^.*\.cpio/cpio/')" | ||
| if [ $2 -eq 0 -a ${is_cpio} == "cpio" ]; then | ||
| cpio_file=$1 | ||
| [ ! -z ${dep_list} ] && echo "$1" | ||
| return 0 | ||
| fi | ||
| if [ -z ${dep_list} ]; then | ||
| print_mtime "$1" >> ${output} | ||
| cat "$1" >> ${output} | ||
| else | ||
| # Failsafe in case directory is empty | ||
| default_initramfs | ||
| grep ^file "$1" | cut -d ' ' -f 3 | ||
| fi | ||
| elif [ -d "$1" ]; then | ||
| dir_filelist "$1" | ||
| else | ||
| echo " $0: Cannot open '$cpio_source'" >&2 | ||
| echo " ${prog}: Cannot open '$1'" >&2 | ||
| exit 1 | ||
| fi | ||
| } | ||
|
|
||
|
|
||
| prog=$0 | ||
| root_uid=0 | ||
| root_gid=0 | ||
| dep_list= | ||
| cpio_file= | ||
| cpio_list= | ||
| output="/dev/stdout" | ||
| output_file="" | ||
|
|
||
| arg="$1" | ||
| case "$arg" in | ||
| "-l") # files included in initramfs - used by kbuild | ||
| dep_list="list_" | ||
| shift | ||
| ;; | ||
| "-o") # generate gzipped cpio image named $1 | ||
| shift | ||
| output_file="$1" | ||
| cpio_list="$(mktemp ${TMPDIR:-/tmp}/cpiolist.XXXXXX)" | ||
| output=${cpio_list} | ||
| shift | ||
| ;; | ||
| esac | ||
| while [ $# -gt 0 ]; do | ||
| arg="$1" | ||
| shift | ||
| case "$arg" in | ||
| "-u") | ||
| "-u") # map $1 to uid=0 (root) | ||
| root_uid="$1" | ||
| shift | ||
| ;; | ||
| "-g") | ||
| "-g") # map $1 to gid=0 (root) | ||
| root_gid="$1" | ||
| shift | ||
| ;; | ||
| "-d") | ||
| "-d") # display default initramfs list | ||
| default_list="$arg" | ||
| default_initramfs | ||
| ${dep_list}default_initramfs | ||
| ;; | ||
| "-h") | ||
| usage | ||
|
|
@@ -181,23 +256,27 @@ while [ $# -gt 0 ]; do | |
| *) | ||
| case "$arg" in | ||
| "-"*) | ||
| printf "ERROR: unknown option \"$arg\"\n" >&2 | ||
| printf "If the filename validly begins with '-', then it must be prefixed\n" >&2 | ||
| printf "by './' so that it won't be interpreted as an option." >&2 | ||
| printf "\n" >&2 | ||
| usage >&2 | ||
| exit 1 | ||
| unknown_option | ||
| ;; | ||
| *) | ||
| cpio_source="$arg" | ||
| build_list | ||
| *) # input file/dir - process it | ||
| input_file "$arg" "$#" | ||
| ;; | ||
| esac | ||
| ;; | ||
| esac | ||
| done | ||
|
|
||
| # spit out the default cpio list if a source hasn't been specified | ||
| [ -z "$cpio_source" -a -z "$default_list" ] && default_initramfs | ||
|
|
||
| # If output_file is set we will generate cpio archive and gzip it | ||
| # we are carefull to delete tmp files | ||
| if [ ! -z ${output_file} ]; then | ||
| if [ -z ${cpio_file} ]; then | ||
| cpio_tfile="$(mktemp ${TMPDIR:-/tmp}/cpiofile.XXXXXX)" | ||
| usr/gen_init_cpio ${cpio_list} > ${cpio_tfile} | ||
| else | ||
| cpio_tfile=${cpio_file} | ||
| fi | ||
| rm ${cpio_list} | ||
| cat ${cpio_tfile} | gzip -f -9 - > ${output_file} | ||
| [ -z ${cpio_file} ] && rm ${cpio_tfile} | ||
| fi | ||
| exit 0 | ||
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