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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#!/bin/bash
2# Copyright (C) Martin Schlemmer <azarah@nosferatu.za.org>
Oleg Verychf6112ec2007-02-06 02:18:20 +01003# Copyright (C) 2006 Sam Ravnborg <sam@ravnborg.org>
Sam Ravnborgd39a2062006-04-11 13:24:32 +02004#
Linus Torvalds1da177e2005-04-16 15:20:36 -07005# Released under the terms of the GNU GPL
6#
Sam Ravnborgd39a2062006-04-11 13:24:32 +02007# Generate a cpio packed initramfs. It uses gen_init_cpio to generate
8# the cpio archive, and gzip to pack it.
9# The script may also be used to generate the inputfile used for gen_init_cpio
10# This script assumes that gen_init_cpio is located in usr/ directory
11
12# error out on errors
13set -e
14
15usage() {
16cat << EOF
17Usage:
18$0 [-o <file>] [-u <uid>] [-g <gid>] {-d | <cpio_source>} ...
19 -o <file> Create gzipped initramfs file named <file> using
Oleg Verychf6112ec2007-02-06 02:18:20 +010020 gen_init_cpio and gzip
Sam Ravnborgd39a2062006-04-11 13:24:32 +020021 -u <uid> User ID to map to user ID 0 (root).
Oleg Verychf6112ec2007-02-06 02:18:20 +010022 <uid> is only meaningful if <cpio_source>
23 is a directory.
Sam Ravnborgd39a2062006-04-11 13:24:32 +020024 -g <gid> Group ID to map to group ID 0 (root).
Oleg Verychf6112ec2007-02-06 02:18:20 +010025 <gid> is only meaningful if <cpio_source>
26 is a directory.
Sam Ravnborgd39a2062006-04-11 13:24:32 +020027 <cpio_source> File list or directory for cpio archive.
Oleg Verychf6112ec2007-02-06 02:18:20 +010028 If <cpio_source> is a .cpio file it will be used
Sam Ravnborgd39a2062006-04-11 13:24:32 +020029 as direct input to initramfs.
30 -d Output the default cpio list.
31
32All options except -o and -l may be repeated and are interpreted
33sequentially and immediately. -u and -g states are preserved across
34<cpio_source> options so an explicit "-u 0 -g 0" is required
35to reset the root/group mapping.
36EOF
37}
38
Oleg Verychf6112ec2007-02-06 02:18:20 +010039# awk style field access
40# $1 - field number; rest is argument string
41field() {
42 shift $1 ; echo $1
43}
44
Sam Ravnborgd39a2062006-04-11 13:24:32 +020045list_default_initramfs() {
46 # echo usr/kinit/kinit
47 :
48}
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
50default_initramfs() {
Sam Ravnborgd39a2062006-04-11 13:24:32 +020051 cat <<-EOF >> ${output}
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 # This is a very simple, default initramfs
53
54 dir /dev 0755 0 0
55 nod /dev/console 0600 0 0 c 5 1
56 dir /root 0700 0 0
Sam Ravnborgd39a2062006-04-11 13:24:32 +020057 # file /kinit usr/kinit/kinit 0755 0 0
58 # slink /init kinit 0755 0 0
Linus Torvalds1da177e2005-04-16 15:20:36 -070059 EOF
60}
61
62filetype() {
63 local argv1="$1"
64
65 # symlink test must come before file test
66 if [ -L "${argv1}" ]; then
67 echo "slink"
68 elif [ -f "${argv1}" ]; then
69 echo "file"
70 elif [ -d "${argv1}" ]; then
71 echo "dir"
72 elif [ -b "${argv1}" -o -c "${argv1}" ]; then
73 echo "nod"
74 elif [ -p "${argv1}" ]; then
75 echo "pipe"
76 elif [ -S "${argv1}" ]; then
77 echo "sock"
78 else
79 echo "invalid"
80 fi
81 return 0
82}
83
Sam Ravnborgd39a2062006-04-11 13:24:32 +020084list_print_mtime() {
85 :
Linus Torvalds1da177e2005-04-16 15:20:36 -070086}
87
Sam Ravnborgd39a2062006-04-11 13:24:32 +020088print_mtime() {
89 local my_mtime="0"
90
91 if [ -e "$1" ]; then
92 my_mtime=$(find "$1" -printf "%T@\n" | sort -r | head -n 1)
93 fi
94
95 echo "# Last modified: ${my_mtime}" >> ${output}
96 echo "" >> ${output}
97}
98
99list_parse() {
100 echo "$1 \\"
101}
102
103# for each file print a line in following format
104# <filetype> <name> <path to file> <octal mode> <uid> <gid>
105# for links, devices etc the format differs. See gen_init_cpio for details
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106parse() {
107 local location="$1"
108 local name="${location/${srcdir}//}"
109 # change '//' into '/'
110 name="${name//\/\///}"
111 local mode="$2"
112 local uid="$3"
113 local gid="$4"
114 local ftype=$(filetype "${location}")
115 # remap uid/gid to 0 if necessary
116 [ "$uid" -eq "$root_uid" ] && uid=0
117 [ "$gid" -eq "$root_gid" ] && gid=0
118 local str="${mode} ${uid} ${gid}"
119
120 [ "${ftype}" == "invalid" ] && return 0
121 [ "${location}" == "${srcdir}" ] && return 0
122
123 case "${ftype}" in
124 "file")
125 str="${ftype} ${name} ${location} ${str}"
126 ;;
127 "nod")
Oleg Verychf6112ec2007-02-06 02:18:20 +0100128 local dev=`LC_ALL=C ls -l "${location}"`
129 local maj=`field 5 ${dev}`
130 local min=`field 6 ${dev}`
131 maj=${maj%,}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132
Oleg Verychf6112ec2007-02-06 02:18:20 +0100133 [ -b "${location}" ] && dev="b" || dev="c"
134
135 str="${ftype} ${name} ${str} ${dev} ${maj} ${min}"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 ;;
137 "slink")
Oleg Verychf6112ec2007-02-06 02:18:20 +0100138 local target=`field 11 $(LC_ALL=C ls -l "${location}")`
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 str="${ftype} ${name} ${target} ${str}"
140 ;;
141 *)
142 str="${ftype} ${name} ${str}"
143 ;;
144 esac
145
Sam Ravnborgd39a2062006-04-11 13:24:32 +0200146 echo "${str}" >> ${output}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147
148 return 0
149}
150
Sam Ravnborgd39a2062006-04-11 13:24:32 +0200151unknown_option() {
152 printf "ERROR: unknown option \"$arg\"\n" >&2
153 printf "If the filename validly begins with '-', " >&2
154 printf "then it must be prefixed\n" >&2
155 printf "by './' so that it won't be interpreted as an option." >&2
156 printf "\n" >&2
157 usage >&2
158 exit 1
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159}
160
Sam Ravnborgd39a2062006-04-11 13:24:32 +0200161list_header() {
Thomas Choua26d79c2006-11-25 11:09:18 -0800162 :
Sam Ravnborgd39a2062006-04-11 13:24:32 +0200163}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164
Sam Ravnborgd39a2062006-04-11 13:24:32 +0200165header() {
166 printf "\n#####################\n# $1\n" >> ${output}
167}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168
Sam Ravnborgd39a2062006-04-11 13:24:32 +0200169# process one directory (incl sub-directories)
170dir_filelist() {
171 ${dep_list}header "$1"
172
173 srcdir=$(echo "$1" | sed -e 's://*:/:g')
174 dirlist=$(find "${srcdir}" -printf "%p %m %U %G\n" 2>/dev/null)
175
176 # If $dirlist is only one line, then the directory is empty
177 if [ "$(echo "${dirlist}" | wc -l)" -gt 1 ]; then
178 ${dep_list}print_mtime "$1"
179
180 echo "${dirlist}" | \
181 while read x; do
182 ${dep_list}parse ${x}
183 done
184 fi
185}
186
187# if only one file is specified and it is .cpio file then use it direct as fs
188# if a directory is specified then add all files in given direcotry to fs
189# if a regular file is specified assume it is in gen_initramfs format
190input_file() {
191 source="$1"
192 if [ -f "$1" ]; then
193 ${dep_list}header "$1"
194 is_cpio="$(echo "$1" | sed 's/^.*\.cpio/cpio/')"
195 if [ $2 -eq 0 -a ${is_cpio} == "cpio" ]; then
196 cpio_file=$1
197 [ ! -z ${dep_list} ] && echo "$1"
198 return 0
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 fi
Sam Ravnborgd39a2062006-04-11 13:24:32 +0200200 if [ -z ${dep_list} ]; then
201 print_mtime "$1" >> ${output}
202 cat "$1" >> ${output}
203 else
Sam Ravnborg46ed9812006-04-30 23:56:33 +0200204 cat "$1" | while read type dir file perm ; do
205 if [ "$type" == "file" ]; then
206 echo "$file \\";
207 fi
208 done
Sam Ravnborgd39a2062006-04-11 13:24:32 +0200209 fi
210 elif [ -d "$1" ]; then
211 dir_filelist "$1"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 else
Sam Ravnborgd39a2062006-04-11 13:24:32 +0200213 echo " ${prog}: Cannot open '$1'" >&2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 exit 1
215 fi
216}
217
Sam Ravnborgd39a2062006-04-11 13:24:32 +0200218prog=$0
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219root_uid=0
220root_gid=0
Sam Ravnborgd39a2062006-04-11 13:24:32 +0200221dep_list=
222cpio_file=
223cpio_list=
224output="/dev/stdout"
225output_file=""
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226
Sam Ravnborgd39a2062006-04-11 13:24:32 +0200227arg="$1"
228case "$arg" in
229 "-l") # files included in initramfs - used by kbuild
230 dep_list="list_"
Thomas Choua26d79c2006-11-25 11:09:18 -0800231 echo "deps_initramfs := \\"
Sam Ravnborgd39a2062006-04-11 13:24:32 +0200232 shift
233 ;;
234 "-o") # generate gzipped cpio image named $1
235 shift
236 output_file="$1"
237 cpio_list="$(mktemp ${TMPDIR:-/tmp}/cpiolist.XXXXXX)"
238 output=${cpio_list}
239 shift
240 ;;
241esac
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242while [ $# -gt 0 ]; do
243 arg="$1"
244 shift
245 case "$arg" in
Sam Ravnborgd39a2062006-04-11 13:24:32 +0200246 "-u") # map $1 to uid=0 (root)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 root_uid="$1"
248 shift
249 ;;
Sam Ravnborgd39a2062006-04-11 13:24:32 +0200250 "-g") # map $1 to gid=0 (root)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 root_gid="$1"
252 shift
253 ;;
Sam Ravnborgd39a2062006-04-11 13:24:32 +0200254 "-d") # display default initramfs list
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 default_list="$arg"
Sam Ravnborgd39a2062006-04-11 13:24:32 +0200256 ${dep_list}default_initramfs
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 ;;
258 "-h")
259 usage
260 exit 0
261 ;;
262 *)
263 case "$arg" in
264 "-"*)
Sam Ravnborgd39a2062006-04-11 13:24:32 +0200265 unknown_option
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 ;;
Sam Ravnborgd39a2062006-04-11 13:24:32 +0200267 *) # input file/dir - process it
268 input_file "$arg" "$#"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 ;;
270 esac
271 ;;
272 esac
273done
274
Sam Ravnborgd39a2062006-04-11 13:24:32 +0200275# If output_file is set we will generate cpio archive and gzip it
276# we are carefull to delete tmp files
277if [ ! -z ${output_file} ]; then
278 if [ -z ${cpio_file} ]; then
279 cpio_tfile="$(mktemp ${TMPDIR:-/tmp}/cpiofile.XXXXXX)"
280 usr/gen_init_cpio ${cpio_list} > ${cpio_tfile}
281 else
282 cpio_tfile=${cpio_file}
283 fi
284 rm ${cpio_list}
285 cat ${cpio_tfile} | gzip -f -9 - > ${output_file}
286 [ -z ${cpio_file} ] && rm ${cpio_tfile}
287fi
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288exit 0