Root/scripts/gen_initramfs_list.sh

Source at commit cdde9cf73945d547acd3e96f9508c79e84ad0bf1 created 9 years 4 months ago.
By Maarten ter Huurne, MMC: JZ4740: Added support for CPU frequency changing
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
13set -e
14
15usage() {
16cat << EOF
17Usage:
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
32All options except -o and -l may be repeated and are interpreted
33sequentially and immediately. -u and -g states are preserved across
34<cpio_source> options so an explicit "-u 0 -g 0" is required
35to reset the root/group mapping.
36EOF
37}
38
39# awk style field access
40# $1 - field number; rest is argument string
41field() {
42    shift $1 ; echo $1
43}
44
45list_default_initramfs() {
46    # echo usr/kinit/kinit
47    :
48}
49
50default_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
62filetype() {
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
84list_print_mtime() {
85    :
86}
87
88print_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
99list_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
106parse() {
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}" >> ${output}
147
148    return 0
149}
150
151unknown_option() {
152    printf "ERROR: unknown option \"$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
161list_header() {
162    :
163}
164
165header() {
166    printf "\n#####################\n# $1\n" >> ${output}
167}
168
169# process one directory (incl sub-directories)
170dir_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
190input_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
220prog=$0
221root_uid=0
222root_gid=0
223dep_list=
224cpio_file=
225cpio_list=
226output="/dev/stdout"
227output_file=""
228is_cpio_compressed=
229compr="gzip -n -9 -f"
230
231arg="$1"
232case "$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 "$output_file" | grep -q "\.gz$" && compr="gzip -n -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 "$output_file" | grep -q "\.xz$" && \
247                compr="xz --check=crc32 --lzma2=dict=1MiB"
248        echo "$output_file" | grep -q "\.lzo$" && compr="lzop -9 -f"
249        echo "$output_file" | grep -q "\.cpio$" && compr="cat"
250        shift
251        ;;
252esac
253while [ $# -gt 0 ]; do
254    arg="$1"
255    shift
256    case "$arg" in
257        "-u") # map $1 to uid=0 (root)
258            root_uid="$1"
259            shift
260            ;;
261        "-g") # map $1 to gid=0 (root)
262            root_gid="$1"
263            shift
264            ;;
265        "-d") # display default initramfs list
266            default_list="$arg"
267            ${dep_list}default_initramfs
268            ;;
269        "-h")
270            usage
271            exit 0
272            ;;
273        *)
274            case "$arg" in
275                "-"*)
276                    unknown_option
277                    ;;
278                *) # input file/dir - process it
279                    input_file "$arg" "$#"
280                    ;;
281            esac
282            ;;
283    esac
284done
285
286# If output_file is set we will generate cpio archive and compress it
287# we are careful to delete tmp files
288if [ ! -z ${output_file} ]; then
289    if [ -z ${cpio_file} ]; then
290        timestamp=
291        if test -n "$KBUILD_BUILD_TIMESTAMP"; then
292            timestamp="$(date -d"$KBUILD_BUILD_TIMESTAMP" +%s || :)"
293            if test -n "$timestamp"; then
294                timestamp="-t $timestamp"
295            fi
296        fi
297        cpio_tfile="$(mktemp ${TMPDIR:-/tmp}/cpiofile.XXXXXX)"
298        usr/gen_init_cpio $timestamp ${cpio_list} > ${cpio_tfile}
299    else
300        cpio_tfile=${cpio_file}
301    fi
302    rm ${cpio_list}
303    if [ "${is_cpio_compressed}" = "compressed" ]; then
304        cat ${cpio_tfile} > ${output_file}
305    else
306        (cat ${cpio_tfile} | ${compr} - > ${output_file}) \
307        || (rm -f ${output_file} ; false)
308    fi
309    [ -z ${cpio_file} ] && rm ${cpio_tfile}
310fi
311exit 0
312

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