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 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
18 $0 [-o <file>] [-u <uid>] [-g <gid>] {-d | <cpio_source>} ...
19 -o <file> Create gzipped initramfs file named <file> using
20 gen_init_cpio and gzip
21 -u <uid> User ID to map to user ID 0 (root).
22 <uid> is only meaningful if <cpio_source>
24 -g <gid> Group ID to map to group ID 0 (root).
25 <gid> is only meaningful if <cpio_source>
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 list_default_initramfs
() {
40 # echo usr/kinit/kinit
45 cat <<-EOF >> ${output}
46 # This is a very simple, default initramfs
49 nod /dev/console 0600 0 0 c 5 1
51 # file /kinit usr/kinit/kinit 0755 0 0
52 # slink /init kinit 0755 0 0
59 # symlink test must come before file test
60 if [ -L "${argv1}" ]; then
62 elif [ -f "${argv1}" ]; then
64 elif [ -d "${argv1}" ]; then
66 elif [ -b "${argv1}" -o -c "${argv1}" ]; then
68 elif [ -p "${argv1}" ]; then
70 elif [ -S "${argv1}" ]; then
86 my_mtime
=$
(find "$1" -printf "%T@\n" |
sort -r |
head -n 1)
89 echo "# Last modified: ${my_mtime}" >> ${output}
97 # for each file print a line in following format
98 # <filetype> <name> <path to file> <octal mode> <uid> <gid>
99 # for links, devices etc the format differs. See gen_init_cpio for details
102 local name
="${location/${srcdir}//}"
103 # change '//' into '/'
104 name
="${name//\/\///}"
108 local ftype
=$
(filetype
"${location}")
109 # remap uid/gid to 0 if necessary
110 [ "$uid" -eq "$root_uid" ] && uid
=0
111 [ "$gid" -eq "$root_gid" ] && gid
=0
112 local str
="${mode} ${uid} ${gid}"
114 [ "${ftype}" == "invalid" ] && return 0
115 [ "${location}" == "${srcdir}" ] && return 0
119 str
="${ftype} ${name} ${location} ${str}"
123 local maj
=$
(LC_ALL
=C
ls -l "${location}" | \
124 gawk
'{sub(/,/, "", $5); print $5}')
125 local min
=$
(LC_ALL
=C
ls -l "${location}" | \
128 if [ -b "${location}" ]; then
133 str
="${ftype} ${name} ${str} ${dev_type} ${maj} ${min}"
136 local target
=$
(LC_ALL
=C
ls -l "${location}" | \
138 str
="${ftype} ${name} ${target} ${str}"
141 str
="${ftype} ${name} ${str}"
145 echo "${str}" >> ${output}
151 printf "ERROR: unknown option \"$arg\"\n" >&2
152 printf "If the filename validly begins with '-', " >&2
153 printf "then it must be prefixed\n" >&2
154 printf "by './' so that it won't be interpreted as an option." >&2
165 printf "\n#####################\n# $1\n" >> ${output}
168 # process one directory (incl sub-directories)
170 ${dep_list}header
"$1"
172 srcdir
=$
(echo "$1" |
sed -e 's://*:/:g')
173 dirlist
=$
(find "${srcdir}" -printf "%p %m %U %G\n" 2>/dev
/null
)
175 # If $dirlist is only one line, then the directory is empty
176 if [ "$(echo "${dirlist}" | wc -l)" -gt 1 ]; then
177 ${dep_list}print_mtime
"$1"
179 echo "${dirlist}" | \
181 ${dep_list}parse
${x}
186 # if only one file is specified and it is .cpio file then use it direct as fs
187 # if a directory is specified then add all files in given direcotry to fs
188 # if a regular file is specified assume it is in gen_initramfs format
192 ${dep_list}header
"$1"
193 is_cpio
="$(echo "$1" | sed 's/^.*\.cpio/cpio/')"
194 if [ $2 -eq 0 -a ${is_cpio} == "cpio" ]; then
196 [ ! -z ${dep_list} ] && echo "$1"
199 if [ -z ${dep_list} ]; then
200 print_mtime
"$1" >> ${output}
201 cat "$1" >> ${output}
203 cat "$1" |
while read type dir
file perm
; do
204 if [ "$type" == "file" ]; then
209 elif [ -d "$1" ]; then
212 echo " ${prog}: Cannot open '$1'" >&2
228 "-l") # files included in initramfs - used by kbuild
230 echo "deps_initramfs := \\"
233 "-o") # generate gzipped cpio image named $1
236 cpio_list
="$(mktemp ${TMPDIR:-/tmp}/cpiolist.XXXXXX)"
241 while [ $# -gt 0 ]; do
245 "-u") # map $1 to uid=0 (root)
249 "-g") # map $1 to gid=0 (root)
253 "-d") # display default initramfs list
255 ${dep_list}default_initramfs
266 *) # input file/dir - process it
267 input_file
"$arg" "$#"
274 # If output_file is set we will generate cpio archive and gzip it
275 # we are carefull to delete tmp files
276 if [ ! -z ${output_file} ]; then
277 if [ -z ${cpio_file} ]; then
278 cpio_tfile
="$(mktemp ${TMPDIR:-/tmp}/cpiofile.XXXXXX)"
279 usr
/gen_init_cpio
${cpio_list} > ${cpio_tfile}
281 cpio_tfile
=${cpio_file}
284 cat ${cpio_tfile} |
gzip -f -9 - > ${output_file}
285 [ -z ${cpio_file} ] && rm ${cpio_tfile}