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1 | #!/bin/bash | |
2 | # Copyright (C) Martin Schlemmer <azarah@nosferatu.za.org> | |
3 | # Copyright (C) 2006 Sam Ravnborg <sam@ravnborg.org> | |
4 | # | |
5 | # Released under the terms of the GNU GPL | |
6 | # | |
7 | # Generate a cpio packed initramfs. It uses gen_init_cpio to generate | |
8 | # the cpio archive, and then compresses 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 | |
13 | set -e | |
14 | ||
15 | usage() { | |
16 | cat << EOF | |
17 | Usage: | |
18 | $0 [-o <file>] [-u <uid>] [-g <gid>] {-d | <cpio_source>} ... | |
19 | -o <file> Create compressed initramfs file named <file> using | |
20 | gen_init_cpio and compressor depending on the extension | |
21 | -u <uid> User ID to map to user ID 0 (root). | |
22 | <uid> is only meaningful if <cpio_source> is a | |
23 | directory. "squash" forces all files to uid 0. | |
24 | -g <gid> Group ID to map to group ID 0 (root). | |
25 | <gid> is only meaningful if <cpio_source> is a | |
26 | directory. "squash" forces all files to gid 0. | |
27 | <cpio_source> File list or directory for cpio archive. | |
28 | If <cpio_source> is a .cpio file it will be used | |
29 | as direct input to initramfs. | |
30 | -d Output the default cpio list. | |
31 | ||
32 | All options except -o and -l may be repeated and are interpreted | |
33 | sequentially and immediately. -u and -g states are preserved across | |
34 | <cpio_source> options so an explicit "-u 0 -g 0" is required | |
35 | to reset the root/group mapping. | |
36 | EOF | |
37 | } | |
38 | ||
39 | # awk style field access | |
40 | # $1 - field number; rest is argument string | |
41 | field() { | |
42 | shift $1 ; echo $1 | |
43 | } | |
44 | ||
45 | list_default_initramfs() { | |
46 | # echo usr/kinit/kinit | |
47 | : | |
48 | } | |
49 | ||
50 | default_initramfs() { | |
51 | cat <<-EOF >> ${output} | |
52 | # 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 | |
57 | # file /kinit usr/kinit/kinit 0755 0 0 | |
58 | # slink /init kinit 0755 0 0 | |
59 | EOF | |
60 | } | |
61 | ||
62 | filetype() { | |
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 | ||
84 | list_print_mtime() { | |
85 | : | |
86 | } | |
87 | ||
88 | print_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 | ||
99 | list_parse() { | |
100 | [ ! -L "$1" ] && 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 | |
106 | parse() { | |
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 "${location}") | |
115 | # remap uid/gid to 0 if necessary | |
116 | [ "$root_uid" = "squash" ] && uid=0 || [ "$uid" -eq "$root_uid" ] && uid=0 | |
117 | [ "$root_gid" = "squash" ] && gid=0 || [ "$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} ${str}" | |
126 | ;; | |
127 | "nod") | |
128 | local dev=`LC_ALL=C ls -l "${location}"` | |
129 | local maj=`field 5 ${dev}` | |
130 | local min=`field 6 ${dev}` | |
131 | maj=${maj%,} | |
132 | ||
133 | [ -b "${location}" ] && dev="b" || dev="c" | |
134 | ||
135 | str="${ftype} ${name} ${str} ${dev} ${maj} ${min}" | |
136 | ;; | |
137 | "slink") | |
138 | local target=`readlink "${location}"` | |
139 | str="${ftype} ${name} ${target} ${str}" | |
140 | ;; | |
141 | *) | |
142 | str="${ftype} ${name} ${str}" | |
143 | ;; | |
144 | esac | |
145 | ||
146 | echo "${str}" >> ${output} | |
147 | ||
148 | return 0 | |
149 | } | |
150 | ||
151 | unknown_option() { | |
152 | printf "ERROR: unknown option \"$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 | |
159 | } | |
160 | ||
161 | list_header() { | |
162 | : | |
163 | } | |
164 | ||
165 | header() { | |
166 | printf "\n#####################\n# $1\n" >> ${output} | |
167 | } | |
168 | ||
169 | # process one directory (incl sub-directories) | |
170 | dir_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") | |
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 | |
190 | input_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 | echo "$1" | grep -q '^.*\.cpio\..*' && is_cpio_compressed="compressed" | |
198 | [ ! -z ${dep_list} ] && echo "$1" | |
199 | return 0 | |
200 | fi | |
201 | if [ -z ${dep_list} ]; then | |
202 | print_mtime "$1" >> ${output} | |
203 | cat "$1" >> ${output} | |
204 | else | |
205 | echo "$1 \\" | |
206 | cat "$1" | while read type dir file perm ; do | |
207 | if [ "$type" == "file" ]; then | |
208 | echo "$file \\"; | |
209 | fi | |
210 | done | |
211 | fi | |
212 | elif [ -d "$1" ]; then | |
213 | dir_filelist "$1" | |
214 | else | |
215 | echo " ${prog}: Cannot open '$1'" >&2 | |
216 | exit 1 | |
217 | fi | |
218 | } | |
219 | ||
220 | prog=$0 | |
221 | root_uid=0 | |
222 | root_gid=0 | |
223 | dep_list= | |
224 | cpio_file= | |
225 | cpio_list= | |
226 | output="/dev/stdout" | |
227 | output_file="" | |
228 | is_cpio_compressed= | |
229 | compr="gzip -9 -f" | |
230 | ||
231 | arg="$1" | |
232 | case "$arg" in | |
233 | "-l") # files included in initramfs - used by kbuild | |
234 | dep_list="list_" | |
235 | echo "deps_initramfs := $0 \\" | |
236 | shift | |
237 | ;; | |
238 | "-o") # generate compressed cpio image named $1 | |
239 | shift | |
240 | output_file="$1" | |
241 | cpio_list="$(mktemp ${TMPDIR:-/tmp}/cpiolist.XXXXXX)" | |
242 | output=${cpio_list} | |
243 | echo "$output_file" | grep -q "\.gz$" && compr="gzip -9 -f" | |
244 | echo "$output_file" | grep -q "\.bz2$" && compr="bzip2 -9 -f" | |
245 | echo "$output_file" | grep -q "\.lzma$" && compr="lzma -9 -f" | |
246 | echo "$output_file" | grep -q "\.lzo$" && compr="lzop -9 -f" | |
247 | echo "$output_file" | grep -q "\.cpio$" && compr="cat" | |
248 | shift | |
249 | ;; | |
250 | esac | |
251 | while [ $# -gt 0 ]; do | |
252 | arg="$1" | |
253 | shift | |
254 | case "$arg" in | |
255 | "-u") # map $1 to uid=0 (root) | |
256 | root_uid="$1" | |
257 | shift | |
258 | ;; | |
259 | "-g") # map $1 to gid=0 (root) | |
260 | root_gid="$1" | |
261 | shift | |
262 | ;; | |
263 | "-d") # display default initramfs list | |
264 | default_list="$arg" | |
265 | ${dep_list}default_initramfs | |
266 | ;; | |
267 | "-h") | |
268 | usage | |
269 | exit 0 | |
270 | ;; | |
271 | *) | |
272 | case "$arg" in | |
273 | "-"*) | |
274 | unknown_option | |
275 | ;; | |
276 | *) # input file/dir - process it | |
277 | input_file "$arg" "$#" | |
278 | ;; | |
279 | esac | |
280 | ;; | |
281 | esac | |
282 | done | |
283 | ||
284 | # If output_file is set we will generate cpio archive and compress it | |
285 | # we are carefull to delete tmp files | |
286 | if [ ! -z ${output_file} ]; then | |
287 | if [ -z ${cpio_file} ]; then | |
288 | cpio_tfile="$(mktemp ${TMPDIR:-/tmp}/cpiofile.XXXXXX)" | |
289 | usr/gen_init_cpio ${cpio_list} > ${cpio_tfile} | |
290 | else | |
291 | cpio_tfile=${cpio_file} | |
292 | fi | |
293 | rm ${cpio_list} | |
294 | if [ "${is_cpio_compressed}" = "compressed" ]; then | |
295 | cat ${cpio_tfile} > ${output_file} | |
296 | else | |
297 | (cat ${cpio_tfile} | ${compr} - > ${output_file}) \ | |
298 | || (rm -f ${output_file} ; false) | |
299 | fi | |
300 | [ -z ${cpio_file} ] && rm ${cpio_tfile} | |
301 | fi | |
302 | exit 0 |