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git.ipfire.org Git - people/ms/linux.git/blob - usr/gen_initramfs.sh
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
9 # This script assumes that gen_init_cpio is located in usr/ directory
17 $0 [-o <file>] [-l <dep_list>] [-u <uid>] [-g <gid>] {-d | <cpio_source>} ...
18 -o <file> Create initramfs file named <file> by using gen_init_cpio
19 -l <dep_list> Create dependency list named <dep_list>
20 -u <uid> User ID to map to user ID 0 (root).
21 <uid> is only meaningful if <cpio_source> is a
22 directory. "squash" forces all files to uid 0.
23 -g <gid> Group ID to map to group ID 0 (root).
24 <gid> is only meaningful if <cpio_source> is a
25 directory. "squash" forces all files to gid 0.
26 <cpio_source> File list or directory for cpio archive.
27 If <cpio_source> is a .cpio file it will be used
28 as direct input to initramfs.
30 All options except -o and -l may be repeated and are interpreted
31 sequentially and immediately. -u and -g states are preserved across
32 <cpio_source> options so an explicit "-u 0 -g 0" is required
33 to reset the root/group mapping.
37 # awk style field access
38 # $1 - field number; rest is argument string
46 # symlink test must come before file test
47 if [ -L "${argv1}" ]; then
49 elif [ -f "${argv1}" ]; then
51 elif [ -d "${argv1}" ]; then
53 elif [ -b "${argv1}" -o -c "${argv1}" ]; then
55 elif [ -p "${argv1}" ]; then
57 elif [ -S "${argv1}" ]; then
69 my_mtime
=$
(find "$1" -printf "%T@\n" |
sort -r |
head -n 1)
72 echo "# Last modified: ${my_mtime}" >> $cpio_list
77 if [ -z "$dep_list" -o -L "$1" ]; then
80 echo "$1" |
sed 's/:/\\:/g; s/$/ \\/' >> $dep_list
83 # for each file print a line in following format
84 # <filetype> <name> <path to file> <octal mode> <uid> <gid>
85 # for links, devices etc the format differs. See gen_init_cpio for details
88 local name
="/${location#${srcdir}}"
89 # change '//' into '/'
90 name
=$
(echo "$name" |
sed -e 's://*:/:g')
94 local ftype
=$
(filetype
"${location}")
95 # remap uid/gid to 0 if necessary
96 [ "$root_uid" = "squash" ] && uid
=0 ||
[ "$uid" -eq "$root_uid" ] && uid
=0
97 [ "$root_gid" = "squash" ] && gid
=0 ||
[ "$gid" -eq "$root_gid" ] && gid
=0
98 local str
="${mode} ${uid} ${gid}"
100 [ "${ftype}" = "invalid" ] && return 0
101 [ "${location}" = "${srcdir}" ] && return 0
105 str
="${ftype} ${name} ${location} ${str}"
108 local dev
="`LC_ALL=C ls -l "${location}"`"
109 local maj
=`field 5 ${dev}`
110 local min
=`field 6 ${dev}`
113 [ -b "${location}" ] && dev
="b" || dev
="c"
115 str
="${ftype} ${name} ${str} ${dev} ${maj} ${min}"
118 local target
=`readlink "${location}"`
119 str
="${ftype} ${name} ${target} ${str}"
122 str
="${ftype} ${name} ${str}"
126 echo "${str}" >> $cpio_list
132 printf "ERROR: unknown option \"$arg\"\n" >&2
133 printf "If the filename validly begins with '-', " >&2
134 printf "then it must be prefixed\n" >&2
135 printf "by './' so that it won't be interpreted as an option." >&2
142 printf "\n#####################\n# $1\n" >> $cpio_list
145 # process one directory (incl sub-directories)
149 srcdir
=$
(echo "$1" |
sed -e 's://*:/:g')
150 dirlist
=$
(find "${srcdir}" -printf "%p %m %U %G\n" | LC_ALL
=C
sort)
152 # If $dirlist is only one line, then the directory is empty
153 if [ "$(echo "${dirlist}" | wc -l)" -gt 1 ]; then
156 echo "${dirlist}" | \
167 # If a regular file is specified, assume it is in
168 # gen_init_cpio format
170 print_mtime
"$1" >> $cpio_list
171 cat "$1" >> $cpio_list
172 if [ -n "$dep_list" ]; then
173 echo "$1 \\" >> $dep_list
174 cat "$1" |
while read type dir
file perm
; do
175 if [ "$type" = "file" ]; then
176 echo "$file \\" >> $dep_list
180 elif [ -d "$1" ]; then
181 # If a directory is specified then add all files in it to fs
184 echo " ${prog}: Cannot open '$1'" >&2
193 cpio_list
=$
(mktemp
${TMPDIR:-/tmp}/cpiolist.XXXXXX
)
196 trap "rm -f $cpio_list" EXIT
198 while [ $# -gt 0 ]; do
202 "-l") # files included in initramfs - used by kbuild
204 echo "deps_initramfs := \\" > $dep_list
207 "-o") # generate cpio image named $1
211 "-u") # map $1 to uid=0 (root)
213 [ "$root_uid" = "-1" ] && root_uid
=$
(id
-u ||
echo 0)
216 "-g") # map $1 to gid=0 (root)
218 [ "$root_gid" = "-1" ] && root_gid
=$
(id
-g ||
echo 0)
230 *) # input file/dir - process it
238 # If output_file is set we will generate cpio archive
239 # we are careful to delete tmp files
241 if test -n "$KBUILD_BUILD_TIMESTAMP"; then
242 timestamp
="$(date -d"$KBUILD_BUILD_TIMESTAMP" +%s || :)"
243 if test -n "$timestamp"; then
244 timestamp
="-t $timestamp"
247 usr
/gen_init_cpio
$timestamp $cpio_list > $output