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Linux/scripts/gen_initramfs_list.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 # 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#${srcdir}}"
109         # change '//' into '/'
110         name=$(echo "$name" | sed -e 's://*:/:g')
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 -n -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 "$output_file" | grep -q "\.gz$" \
244                 && [ -x "`which gzip 2> /dev/null`" ] \
245                 && compr="gzip -n -9 -f"
246                 echo "$output_file" | grep -q "\.bz2$" \
247                 && [ -x "`which bzip2 2> /dev/null`" ] \
248                 && compr="bzip2 -9 -f"
249                 echo "$output_file" | grep -q "\.lzma$" \
250                 && [ -x "`which lzma 2> /dev/null`" ] \
251                 && compr="lzma -9 -f"
252                 echo "$output_file" | grep -q "\.xz$" \
253                 && [ -x "`which xz 2> /dev/null`" ] \
254                 && compr="xz --check=crc32 --lzma2=dict=1MiB"
255                 echo "$output_file" | grep -q "\.lzo$" \
256                 && [ -x "`which lzop 2> /dev/null`" ] \
257                 && compr="lzop -9 -f"
258                 echo "$output_file" | grep -q "\.lz4$" \
259                 && [ -x "`which lz4 2> /dev/null`" ] \
260                 && compr="lz4 -l -9 -f"
261                 echo "$output_file" | grep -q "\.cpio$" && compr="cat"
262                 shift
263                 ;;
264 esac
265 while [ $# -gt 0 ]; do
266         arg="$1"
267         shift
268         case "$arg" in
269                 "-u")   # map $1 to uid=0 (root)
270                         root_uid="$1"
271                         shift
272                         ;;
273                 "-g")   # map $1 to gid=0 (root)
274                         root_gid="$1"
275                         shift
276                         ;;
277                 "-d")   # display default initramfs list
278                         default_list="$arg"
279                         ${dep_list}default_initramfs
280                         ;;
281                 "-h")
282                         usage
283                         exit 0
284                         ;;
285                 *)
286                         case "$arg" in
287                                 "-"*)
288                                         unknown_option
289                                         ;;
290                                 *)      # input file/dir - process it
291                                         input_file "$arg" "$#"
292                                         ;;
293                         esac
294                         ;;
295         esac
296 done
297 
298 # If output_file is set we will generate cpio archive and compress it
299 # we are careful to delete tmp files
300 if [ ! -z ${output_file} ]; then
301         if [ -z ${cpio_file} ]; then
302                 timestamp=
303                 if test -n "$KBUILD_BUILD_TIMESTAMP"; then
304                         timestamp="$(date -d"$KBUILD_BUILD_TIMESTAMP" +%s || :)"
305                         if test -n "$timestamp"; then
306                                 timestamp="-t $timestamp"
307                         fi
308                 fi
309                 cpio_tfile="$(mktemp ${TMPDIR:-/tmp}/cpiofile.XXXXXX)"
310                 usr/gen_init_cpio $timestamp ${cpio_list} > ${cpio_tfile}
311         else
312                 cpio_tfile=${cpio_file}
313         fi
314         rm ${cpio_list}
315         if [ "${is_cpio_compressed}" = "compressed" ]; then
316                 cat ${cpio_tfile} > ${output_file}
317         else
318                 (cat ${cpio_tfile} | ${compr}  - > ${output_file}) \
319                 || (rm -f ${output_file} ; false)
320         fi
321         [ -z ${cpio_file} ] && rm ${cpio_tfile}
322 fi
323 exit 0

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