2 # Copyright (C) Martin Schlemmer <azarah@nosferatu.za.org>
3 # Copyright (C) 2006 Sam Ravnborg <sam@ravnborg.org>
5 # Released under the terms of the GNU GPL
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
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.
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.
39 # awk style field access
40 # $1 - field number; rest is argument string
45 list_default_initramfs
() {
46 # echo usr/kinit/kinit
51 cat <<-EOF >> ${output}
52 # This is a very simple, default initramfs
55 nod /dev/console 0600 0 0 c 5 1
57 # file /kinit usr/kinit/kinit 0755 0 0
58 # slink /init kinit 0755 0 0
65 # symlink test must come before file test
66 if [ -L "${argv1}" ]; then
68 elif [ -f "${argv1}" ]; then
70 elif [ -d "${argv1}" ]; then
72 elif [ -b "${argv1}" -o -c "${argv1}" ]; then
74 elif [ -p "${argv1}" ]; then
76 elif [ -S "${argv1}" ]; then
92 my_mtime
=$
(find "$1" -printf "%T@\n" |
sort -r |
head -n 1)
95 echo "# Last modified: ${my_mtime}" >> ${output}
100 [ ! -L "$1" ] && echo "$1 \\" ||
:
103 # for each file print a line in following format
104 # <filetype> <name> <path to file> <octal mode> <uid> <gid>
105 # for links, devices etc the format differs. See gen_init_cpio for details
108 local name
="${location/${srcdir}//}"
109 # change '//' into '/'
110 name
="${name//\/\///}"
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} ${gid}"
120 [ "${ftype}" == "invalid" ] && return 0
121 [ "${location}" == "${srcdir}" ] && return 0
125 str
="${ftype} ${name} ${location} ${str}"
128 local dev
=`LC_ALL=C ls -l "${location}"`
129 local maj
=`field 5 ${dev}`
130 local min
=`field 6 ${dev}`
133 [ -b "${location}" ] && dev
="b" || dev
="c"
135 str
="${ftype} ${name} ${str} ${dev} ${maj} ${min}"
138 local target
=`readlink "${location}"`
139 str
="${ftype} ${name} ${target} ${str}"
142 str
="${ftype} ${name} ${str}"
146 echo "${str}" >> ${output}
152 printf "ERROR: unknown option \"$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
166 printf "\n#####################\n# $1\n" >> ${output}
169 # process one directory (incl sub-directories)
171 ${dep_list}header
"$1"
173 srcdir
=$
(echo "$1" |
sed -e 's://*:/:g')
174 dirlist
=$
(find "${srcdir}" -printf "%p %m %U %G\n")
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
"$1"
180 echo "${dirlist}" | \
182 ${dep_list}parse
${x}
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
193 ${dep_list}header
"$1"
194 is_cpio
="$(echo "$1" | sed 's/^.*\.cpio\(\..*\)\?/cpio/')"
195 if [ $2 -eq 0 -a ${is_cpio} == "cpio" ]; then
197 echo "$1" |
grep -q '^.*\.cpio\..*' && is_cpio_compressed
="compressed"
198 [ ! -z ${dep_list} ] && echo "$1"
201 if [ -z ${dep_list} ]; then
202 print_mtime
"$1" >> ${output}
203 cat "$1" >> ${output}
206 cat "$1" |
while read type dir
file perm
; do
207 if [ "$type" == "file" ]; then
212 elif [ -d "$1" ]; then
215 echo " ${prog}: Cannot open '$1'" >&2
233 "-l") # files included in initramfs - used by kbuild
235 echo "deps_initramfs := $0 \\"
238 "-o") # generate compressed cpio image named $1
241 cpio_list
="$(mktemp ${TMPDIR:-/tmp}/cpiolist.XXXXXX)"
243 echo "$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"
251 while [ $# -gt 0 ]; do
255 "-u") # map $1 to uid=0 (root)
259 "-g") # map $1 to gid=0 (root)
263 "-d") # display default initramfs list
265 ${dep_list}default_initramfs
276 *) # input file/dir - process it
277 input_file
"$arg" "$#"
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} > ${cpio_tfile}
291 cpio_tfile
=${cpio_file}
294 if [ "${is_cpio_compressed}" = "compressed" ]; then
295 cat ${cpio_tfile} > ${output_file}
297 (cat ${cpio_tfile} | ${compr} - > ${output_file}) \
298 ||
(rm -f ${output_file} ; false
)
300 [ -z ${cpio_file} ] && rm ${cpio_tfile}
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