1efb87bda545b8fb411e49e118dfcba7dc03f399
[linux-2.6-microblaze.git] / usr / gen_initramfs.sh
1 #!/bin/sh
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 # This script assumes that gen_init_cpio is located in usr/ directory
10
11 # error out on errors
12 set -e
13
14 usage() {
15 cat << EOF
16 Usage:
17 $0 [-o <file>] [-l <dep_list>] [-u <uid>] [-g <gid>] {-d | <cpio_source>} ...
18         -o <file>      Create compressed initramfs file named <file> using
19                        gen_init_cpio and compressor depending on the extension
20         -l <dep_list>  Create dependency list named <dep_list>
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
31 All options except -o and -l may be repeated and are interpreted
32 sequentially and immediately.  -u and -g states are preserved across
33 <cpio_source> options so an explicit "-u 0 -g 0" is required
34 to reset the root/group mapping.
35 EOF
36 }
37
38 # awk style field access
39 # $1 - field number; rest is argument string
40 field() {
41         shift $1 ; echo $1
42 }
43
44 filetype() {
45         local argv1="$1"
46
47         # symlink test must come before file test
48         if [ -L "${argv1}" ]; then
49                 echo "slink"
50         elif [ -f "${argv1}" ]; then
51                 echo "file"
52         elif [ -d "${argv1}" ]; then
53                 echo "dir"
54         elif [ -b "${argv1}" -o -c "${argv1}" ]; then
55                 echo "nod"
56         elif [ -p "${argv1}" ]; then
57                 echo "pipe"
58         elif [ -S "${argv1}" ]; then
59                 echo "sock"
60         else
61                 echo "invalid"
62         fi
63         return 0
64 }
65
66 print_mtime() {
67         local my_mtime="0"
68
69         if [ -e "$1" ]; then
70                 my_mtime=$(find "$1" -printf "%T@\n" | sort -r | head -n 1)
71         fi
72
73         echo "# Last modified: ${my_mtime}" >> $cpio_list
74         echo "" >> $cpio_list
75 }
76
77 list_parse() {
78         if [ -z "$dep_list" -o -L "$1" ]; then
79                 return
80         fi
81         echo "$1" | sed 's/:/\\:/g; s/$/ \\/' >> $dep_list
82 }
83
84 # for each file print a line in following format
85 # <filetype> <name> <path to file> <octal mode> <uid> <gid>
86 # for links, devices etc the format differs. See gen_init_cpio for details
87 parse() {
88         local location="$1"
89         local name="/${location#${srcdir}}"
90         # change '//' into '/'
91         name=$(echo "$name" | sed -e 's://*:/:g')
92         local mode="$2"
93         local uid="$3"
94         local gid="$4"
95         local ftype=$(filetype "${location}")
96         # remap uid/gid to 0 if necessary
97         [ "$root_uid" = "squash" ] && uid=0 || [ "$uid" -eq "$root_uid" ] && uid=0
98         [ "$root_gid" = "squash" ] && gid=0 || [ "$gid" -eq "$root_gid" ] && gid=0
99         local str="${mode} ${uid} ${gid}"
100
101         [ "${ftype}" = "invalid" ] && return 0
102         [ "${location}" = "${srcdir}" ] && return 0
103
104         case "${ftype}" in
105                 "file")
106                         str="${ftype} ${name} ${location} ${str}"
107                         ;;
108                 "nod")
109                         local dev="`LC_ALL=C ls -l "${location}"`"
110                         local maj=`field 5 ${dev}`
111                         local min=`field 6 ${dev}`
112                         maj=${maj%,}
113
114                         [ -b "${location}" ] && dev="b" || dev="c"
115
116                         str="${ftype} ${name} ${str} ${dev} ${maj} ${min}"
117                         ;;
118                 "slink")
119                         local target=`readlink "${location}"`
120                         str="${ftype} ${name} ${target} ${str}"
121                         ;;
122                 *)
123                         str="${ftype} ${name} ${str}"
124                         ;;
125         esac
126
127         echo "${str}" >> $cpio_list
128
129         return 0
130 }
131
132 unknown_option() {
133         printf "ERROR: unknown option \"$arg\"\n" >&2
134         printf "If the filename validly begins with '-', " >&2
135         printf "then it must be prefixed\n" >&2
136         printf "by './' so that it won't be interpreted as an option." >&2
137         printf "\n" >&2
138         usage >&2
139         exit 1
140 }
141
142 header() {
143         printf "\n#####################\n# $1\n" >> $cpio_list
144 }
145
146 # process one directory (incl sub-directories)
147 dir_filelist() {
148         header "$1"
149
150         srcdir=$(echo "$1" | sed -e 's://*:/:g')
151         dirlist=$(find "${srcdir}" -printf "%p %m %U %G\n" | LANG=C sort)
152
153         # If $dirlist is only one line, then the directory is empty
154         if [  "$(echo "${dirlist}" | wc -l)" -gt 1 ]; then
155                 print_mtime "$1"
156
157                 echo "${dirlist}" | \
158                 while read x; do
159                         list_parse $x
160                         parse $x
161                 done
162         fi
163 }
164
165 # if only one file is specified and it is .cpio file then use it direct as fs
166 # if a directory is specified then add all files in given direcotry to fs
167 # if a regular file is specified assume it is in gen_init_cpio format
168 input_file() {
169         source="$1"
170         if [ -f "$1" ]; then
171                 header "$1"
172                 is_cpio="$(echo "$1" | sed 's/^.*\.cpio\(\..*\)\{0,1\}/cpio/')"
173                 if [ $2 -eq 0 -a ${is_cpio} = "cpio" ]; then
174                         cpio_file=$1
175                         echo "$1" | grep -q '^.*\.cpio\..*' && is_cpio_compressed="compressed"
176                         [ -n "$dep_list" ] && echo "$1" >> $dep_list
177                         return 0
178                 fi
179                 print_mtime "$1" >> $cpio_list
180                 cat "$1"         >> $cpio_list
181                 if [ -n "$dep_list" ]; then
182                         echo "$1 \\"  >> $dep_list
183                         cat "$1" | while read type dir file perm ; do
184                                 if [ "$type" = "file" ]; then
185                                         echo "$file \\" >> $dep_list
186                                 fi
187                         done
188                 fi
189         elif [ -d "$1" ]; then
190                 dir_filelist "$1"
191         else
192                 echo "  ${prog}: Cannot open '$1'" >&2
193                 exit 1
194         fi
195 }
196
197 prog=$0
198 root_uid=0
199 root_gid=0
200 dep_list=
201 cpio_file=
202 cpio_list=$(mktemp ${TMPDIR:-/tmp}/cpiolist.XXXXXX)
203 output="/dev/stdout"
204 output_file="/dev/stdout"
205 is_cpio_compressed=
206 compr="gzip -n -9 -f"
207
208 while [ $# -gt 0 ]; do
209         arg="$1"
210         shift
211         case "$arg" in
212                 "-l")   # files included in initramfs - used by kbuild
213                         dep_list="$1"
214                         echo "deps_initramfs := \\" > $dep_list
215                         shift
216                         ;;
217                 "-o")   # generate compressed cpio image named $1
218                         output_file="$1"
219                         output=$cpio_list
220                         echo "$output_file" | grep -q "\.gz$" \
221                         && [ -x "`which gzip 2> /dev/null`" ] \
222                         && compr="gzip -n -9 -f"
223                         echo "$output_file" | grep -q "\.bz2$" \
224                         && [ -x "`which bzip2 2> /dev/null`" ] \
225                         && compr="bzip2 -9 -f"
226                         echo "$output_file" | grep -q "\.lzma$" \
227                         && [ -x "`which lzma 2> /dev/null`" ] \
228                         && compr="lzma -9 -f"
229                         echo "$output_file" | grep -q "\.xz$" \
230                         && [ -x "`which xz 2> /dev/null`" ] \
231                         && compr="xz --check=crc32 --lzma2=dict=1MiB"
232                         echo "$output_file" | grep -q "\.lzo$" \
233                         && [ -x "`which lzop 2> /dev/null`" ] \
234                         && compr="lzop -9 -f"
235                         echo "$output_file" | grep -q "\.lz4$" \
236                         && [ -x "`which lz4 2> /dev/null`" ] \
237                         && compr="lz4 -l -9 -f"
238                         echo "$output_file" | grep -q "\.cpio$" && compr="cat"
239                         shift
240                         ;;
241                 "-u")   # map $1 to uid=0 (root)
242                         root_uid="$1"
243                         [ "$root_uid" = "-1" ] && root_uid=$(id -u || echo 0)
244                         shift
245                         ;;
246                 "-g")   # map $1 to gid=0 (root)
247                         root_gid="$1"
248                         [ "$root_gid" = "-1" ] && root_gid=$(id -g || echo 0)
249                         shift
250                         ;;
251                 "-h")
252                         usage
253                         exit 0
254                         ;;
255                 *)
256                         case "$arg" in
257                                 "-"*)
258                                         unknown_option
259                                         ;;
260                                 *)      # input file/dir - process it
261                                         input_file "$arg" "$#"
262                                         ;;
263                         esac
264                         ;;
265         esac
266 done
267
268 # If output_file is set we will generate cpio archive and compress it
269 # we are careful to delete tmp files
270 if [ -z ${cpio_file} ]; then
271         timestamp=
272         if test -n "$KBUILD_BUILD_TIMESTAMP"; then
273                 timestamp="$(date -d"$KBUILD_BUILD_TIMESTAMP" +%s || :)"
274                 if test -n "$timestamp"; then
275                         timestamp="-t $timestamp"
276                 fi
277         fi
278         cpio_tfile="$(mktemp ${TMPDIR:-/tmp}/cpiofile.XXXXXX)"
279         usr/gen_init_cpio $timestamp ${cpio_list} > ${cpio_tfile}
280 else
281         cpio_tfile=${cpio_file}
282 fi
283 rm ${cpio_list}
284 if [ "${is_cpio_compressed}" = "compressed" ]; then
285         cat ${cpio_tfile} > ${output_file}
286 else
287         (cat ${cpio_tfile} | ${compr}  - > ${output_file}) \
288         || (rm -f ${output_file} ; false)
289 fi
290 [ -z ${cpio_file} ] && rm ${cpio_tfile}
291 exit 0