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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 Ravnborgd39a206b2006-04-11 13:24:32 +02004#
Linus Torvalds1da177e2005-04-16 15:20:36 -07005# Released under the terms of the GNU GPL
6#
Sam Ravnborgd39a206b2006-04-11 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 Ravnborgd39a206b2006-04-11 13:24:32 +020021 -u <uid> User ID to map to user ID 0 (root).
Mike Frysinger4c6f2eb2007-05-10 22:44:28 -070022 <uid> is only meaningful if <cpio_source> is a
23 directory. "squash" forces all files to uid 0.
Sam Ravnborgd39a206b2006-04-11 13:24:32 +020024 -g <gid> Group ID to map to group ID 0 (root).
Mike Frysinger4c6f2eb2007-05-10 22:44:28 -070025 <gid> is only meaningful if <cpio_source> is a
26 directory. "squash" forces all files to gid 0.
Sam Ravnborgd39a206b2006-04-11 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 Ravnborgd39a206b2006-04-11 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 Ravnborgd39a206b2006-04-11 13:24:32 +020045list_default_initramfs() {
46 # echo usr/kinit/kinit
47 :
48}
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
50default_initramfs() {
Sam Ravnborgd39a206b2006-04-11 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 Ravnborgd39a206b2006-04-11 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 Ravnborgd39a206b2006-04-11 13:24:32 +020084list_print_mtime() {
85 :
Linus Torvalds1da177e2005-04-16 15:20:36 -070086}
87
Sam Ravnborgd39a206b2006-04-11 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 "${location}")
115 # remap uid/gid to 0 if necessary
Mike Frysinger4c6f2eb2007-05-10 22:44:28 -0700116 [ "$root_uid" = "squash" ] && uid=0 || [ "$uid" -eq "$root_uid" ] && uid=0
117 [ "$root_gid" = "squash" ] && gid=0 || [ "$gid" -eq "$root_gid" ] && gid=0
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 local str="${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} ${min}"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 ;;
137 "slink")
Felix Fietkaub5a5e4c2008-04-02 14:50:05 +0200138 local target=`readlink "${location}"`
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 str="${ftype} ${name} ${target} ${str}"
140 ;;
141 *)
142 str="${ftype} ${name} ${str}"
143 ;;
144 esac
145
Sam Ravnborgd39a206b2006-04-11 13:24:32 +0200146 echo "${str}" >> ${output}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147
148 return 0
149}
150
Sam Ravnborgd39a206b2006-04-11 13:24:32 +0200151unknown_option() {
152 printf "ERROR: unknown option \"$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 Ravnborgd39a206b2006-04-11 13:24:32 +0200161list_header() {
Thomas Choua26d79c2006-11-25 11:09:18 -0800162 :
Sam Ravnborgd39a206b2006-04-11 13:24:32 +0200163}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164
Sam Ravnborgd39a206b2006-04-11 13:24:32 +0200165header() {
166 printf "\n#####################\n# $1\n" >> ${output}
167}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168
Sam Ravnborgd39a206b2006-04-11 13:24:32 +0200169# process one directory (incl sub-directories)
170dir_filelist() {
171 ${dep_list}header "$1"
172
173 srcdir=$(echo "$1" | sed -e 's://*:/:g')
Michael Ellermaneda890a2007-04-30 15:34:15 +1000174 dirlist=$(find "${srcdir}" -printf "%p %m %U %G\n")
Sam Ravnborgd39a206b2006-04-11 13:24:32 +0200175
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 "$1"
Alex Landauc299ec22007-04-26 00:17:29 -0700194 is_cpio="$(echo "$1" | sed 's/^.*\.cpio\(\..*\)\?/cpio/')"
Sam Ravnborgd39a206b2006-04-11 13:24:32 +0200195 if [ $2 -eq 0 -a ${is_cpio} == "cpio" ]; then
196 cpio_file=$1
Alex Landauc299ec22007-04-26 00:17:29 -0700197 echo "$1" | grep -q '^.*\.cpio\..*' && is_cpio_compressed="compressed"
Sam Ravnborgd39a206b2006-04-11 13:24:32 +0200198 [ ! -z ${dep_list} ] && echo "$1"
199 return 0
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 fi
Sam Ravnborgd39a206b2006-04-11 13:24:32 +0200201 if [ -z ${dep_list} ]; then
202 print_mtime "$1" >> ${output}
203 cat "$1" >> ${output}
204 else
Sam Ravnborg46ed9812006-04-30 23:56:33 +0200205 cat "$1" | while read type dir file perm ; do
206 if [ "$type" == "file" ]; then
207 echo "$file \\";
208 fi
209 done
Sam Ravnborgd39a206b2006-04-11 13:24:32 +0200210 fi
211 elif [ -d "$1" ]; then
212 dir_filelist "$1"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 else
Sam Ravnborgd39a206b2006-04-11 13:24:32 +0200214 echo " ${prog}: Cannot open '$1'" >&2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 exit 1
216 fi
217}
218
Sam Ravnborgd39a206b2006-04-11 13:24:32 +0200219prog=$0
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220root_uid=0
221root_gid=0
Sam Ravnborgd39a206b2006-04-11 13:24:32 +0200222dep_list=
223cpio_file=
224cpio_list=
225output="/dev/stdout"
226output_file=""
Alex Landauc299ec22007-04-26 00:17:29 -0700227is_cpio_compressed=
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228
Sam Ravnborgd39a206b2006-04-11 13:24:32 +0200229arg="$1"
230case "$arg" in
231 "-l") # files included in initramfs - used by kbuild
232 dep_list="list_"
Thomas Choua26d79c2006-11-25 11:09:18 -0800233 echo "deps_initramfs := \\"
Sam Ravnborgd39a206b2006-04-11 13:24:32 +0200234 shift
235 ;;
236 "-o") # generate gzipped cpio image named $1
237 shift
238 output_file="$1"
239 cpio_list="$(mktemp ${TMPDIR:-/tmp}/cpiolist.XXXXXX)"
240 output=${cpio_list}
241 shift
242 ;;
243esac
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244while [ $# -gt 0 ]; do
245 arg="$1"
246 shift
247 case "$arg" in
Sam Ravnborgd39a206b2006-04-11 13:24:32 +0200248 "-u") # map $1 to uid=0 (root)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 root_uid="$1"
250 shift
251 ;;
Sam Ravnborgd39a206b2006-04-11 13:24:32 +0200252 "-g") # map $1 to gid=0 (root)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 root_gid="$1"
254 shift
255 ;;
Sam Ravnborgd39a206b2006-04-11 13:24:32 +0200256 "-d") # display default initramfs list
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 default_list="$arg"
Sam Ravnborgd39a206b2006-04-11 13:24:32 +0200258 ${dep_list}default_initramfs
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 ;;
260 "-h")
261 usage
262 exit 0
263 ;;
264 *)
265 case "$arg" in
266 "-"*)
Sam Ravnborgd39a206b2006-04-11 13:24:32 +0200267 unknown_option
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 ;;
Sam Ravnborgd39a206b2006-04-11 13:24:32 +0200269 *) # input file/dir - process it
270 input_file "$arg" "$#"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 ;;
272 esac
273 ;;
274 esac
275done
276
Sam Ravnborgd39a206b2006-04-11 13:24:32 +0200277# If output_file is set we will generate cpio archive and gzip it
278# we are carefull to delete tmp files
279if [ ! -z ${output_file} ]; then
280 if [ -z ${cpio_file} ]; then
281 cpio_tfile="$(mktemp ${TMPDIR:-/tmp}/cpiofile.XXXXXX)"
282 usr/gen_init_cpio ${cpio_list} > ${cpio_tfile}
283 else
284 cpio_tfile=${cpio_file}
285 fi
286 rm ${cpio_list}
Alex Landauc299ec22007-04-26 00:17:29 -0700287 if [ "${is_cpio_compressed}" = "compressed" ]; then
288 cat ${cpio_tfile} > ${output_file}
289 else
290 cat ${cpio_tfile} | gzip -f -9 - > ${output_file}
291 fi
Sam Ravnborgd39a206b2006-04-11 13:24:32 +0200292 [ -z ${cpio_file} ] && rm ${cpio_tfile}
293fi
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294exit 0