303 lines
7.1 KiB
Bash
303 lines
7.1 KiB
Bash
#!/bin/bash
|
|
# Copyright (C) Martin Schlemmer <azarah@nosferatu.za.org>
|
|
# Copyright (C) 2006 Sam Ravnborg <sam@ravnborg.org>
|
|
#
|
|
# Released under the terms of the GNU GPL
|
|
#
|
|
# Generate a cpio packed initramfs. It uses gen_init_cpio to generate
|
|
# the cpio archive, and then compresses it.
|
|
# The script may also be used to generate the inputfile used for gen_init_cpio
|
|
# This script assumes that gen_init_cpio is located in usr/ directory
|
|
|
|
# error out on errors
|
|
set -e
|
|
|
|
usage() {
|
|
cat << EOF
|
|
Usage:
|
|
$0 [-o <file>] [-u <uid>] [-g <gid>] {-d | <cpio_source>} ...
|
|
-o <file> Create compressed initramfs file named <file> using
|
|
gen_init_cpio and compressor depending on the extension
|
|
-u <uid> User ID to map to user ID 0 (root).
|
|
<uid> is only meaningful if <cpio_source> is a
|
|
directory. "squash" forces all files to uid 0.
|
|
-g <gid> Group ID to map to group ID 0 (root).
|
|
<gid> is only meaningful if <cpio_source> is a
|
|
directory. "squash" forces all files to gid 0.
|
|
<cpio_source> File list or directory for cpio archive.
|
|
If <cpio_source> is a .cpio file it will be used
|
|
as direct input to initramfs.
|
|
-d Output the default cpio list.
|
|
|
|
All options except -o and -l may be repeated and are interpreted
|
|
sequentially and immediately. -u and -g states are preserved across
|
|
<cpio_source> options so an explicit "-u 0 -g 0" is required
|
|
to reset the root/group mapping.
|
|
EOF
|
|
}
|
|
|
|
# awk style field access
|
|
# $1 - field number; rest is argument string
|
|
field() {
|
|
shift $1 ; echo $1
|
|
}
|
|
|
|
list_default_initramfs() {
|
|
# echo usr/kinit/kinit
|
|
:
|
|
}
|
|
|
|
default_initramfs() {
|
|
cat <<-EOF >> ${output}
|
|
# This is a very simple, default initramfs
|
|
|
|
dir /dev 0755 0 0
|
|
nod /dev/console 0600 0 0 c 5 1
|
|
dir /root 0700 0 0
|
|
# file /kinit usr/kinit/kinit 0755 0 0
|
|
# slink /init kinit 0755 0 0
|
|
EOF
|
|
}
|
|
|
|
filetype() {
|
|
local argv1="$1"
|
|
|
|
# symlink test must come before file test
|
|
if [ -L "${argv1}" ]; then
|
|
echo "slink"
|
|
elif [ -f "${argv1}" ]; then
|
|
echo "file"
|
|
elif [ -d "${argv1}" ]; then
|
|
echo "dir"
|
|
elif [ -b "${argv1}" -o -c "${argv1}" ]; then
|
|
echo "nod"
|
|
elif [ -p "${argv1}" ]; then
|
|
echo "pipe"
|
|
elif [ -S "${argv1}" ]; then
|
|
echo "sock"
|
|
else
|
|
echo "invalid"
|
|
fi
|
|
return 0
|
|
}
|
|
|
|
list_print_mtime() {
|
|
:
|
|
}
|
|
|
|
print_mtime() {
|
|
local my_mtime="0"
|
|
|
|
if [ -e "$1" ]; then
|
|
my_mtime=$(find "$1" -printf "%T@\n" | sort -r | head -n 1)
|
|
fi
|
|
|
|
echo "# Last modified: ${my_mtime}" >> ${output}
|
|
echo "" >> ${output}
|
|
}
|
|
|
|
list_parse() {
|
|
[ ! -L "$1" ] && echo "$1 \\" || :
|
|
}
|
|
|
|
# for each file print a line in following format
|
|
# <filetype> <name> <path to file> <octal mode> <uid> <gid>
|
|
# for links, devices etc the format differs. See gen_init_cpio for details
|
|
parse() {
|
|
local location="$1"
|
|
local name="${location/${srcdir}//}"
|
|
# change '//' into '/'
|
|
name="${name//\/\///}"
|
|
local mode="$2"
|
|
local uid="$3"
|
|
local gid="$4"
|
|
local ftype=$(filetype "${location}")
|
|
# remap uid/gid to 0 if necessary
|
|
[ "$root_uid" = "squash" ] && uid=0 || [ "$uid" -eq "$root_uid" ] && uid=0
|
|
[ "$root_gid" = "squash" ] && gid=0 || [ "$gid" -eq "$root_gid" ] && gid=0
|
|
local str="${mode} ${uid} ${gid}"
|
|
|
|
[ "${ftype}" == "invalid" ] && return 0
|
|
[ "${location}" == "${srcdir}" ] && return 0
|
|
|
|
case "${ftype}" in
|
|
"file")
|
|
str="${ftype} ${name} ${location} ${str}"
|
|
;;
|
|
"nod")
|
|
local dev=`LC_ALL=C ls -l "${location}"`
|
|
local maj=`field 5 ${dev}`
|
|
local min=`field 6 ${dev}`
|
|
maj=${maj%,}
|
|
|
|
[ -b "${location}" ] && dev="b" || dev="c"
|
|
|
|
str="${ftype} ${name} ${str} ${dev} ${maj} ${min}"
|
|
;;
|
|
"slink")
|
|
local target=`readlink "${location}"`
|
|
str="${ftype} ${name} ${target} ${str}"
|
|
;;
|
|
*)
|
|
str="${ftype} ${name} ${str}"
|
|
;;
|
|
esac
|
|
|
|
echo "${str}" >> ${output}
|
|
|
|
return 0
|
|
}
|
|
|
|
unknown_option() {
|
|
printf "ERROR: unknown option \"$arg\"\n" >&2
|
|
printf "If the filename validly begins with '-', " >&2
|
|
printf "then it must be prefixed\n" >&2
|
|
printf "by './' so that it won't be interpreted as an option." >&2
|
|
printf "\n" >&2
|
|
usage >&2
|
|
exit 1
|
|
}
|
|
|
|
list_header() {
|
|
:
|
|
}
|
|
|
|
header() {
|
|
printf "\n#####################\n# $1\n" >> ${output}
|
|
}
|
|
|
|
# process one directory (incl sub-directories)
|
|
dir_filelist() {
|
|
${dep_list}header "$1"
|
|
|
|
srcdir=$(echo "$1" | sed -e 's://*:/:g')
|
|
dirlist=$(find "${srcdir}" -printf "%p %m %U %G\n")
|
|
|
|
# If $dirlist is only one line, then the directory is empty
|
|
if [ "$(echo "${dirlist}" | wc -l)" -gt 1 ]; then
|
|
${dep_list}print_mtime "$1"
|
|
|
|
echo "${dirlist}" | \
|
|
while read x; do
|
|
${dep_list}parse ${x}
|
|
done
|
|
fi
|
|
}
|
|
|
|
# if only one file is specified and it is .cpio file then use it direct as fs
|
|
# if a directory is specified then add all files in given direcotry to fs
|
|
# if a regular file is specified assume it is in gen_initramfs format
|
|
input_file() {
|
|
source="$1"
|
|
if [ -f "$1" ]; then
|
|
${dep_list}header "$1"
|
|
is_cpio="$(echo "$1" | sed 's/^.*\.cpio\(\..*\)\?/cpio/')"
|
|
if [ $2 -eq 0 -a ${is_cpio} == "cpio" ]; then
|
|
cpio_file=$1
|
|
echo "$1" | grep -q '^.*\.cpio\..*' && is_cpio_compressed="compressed"
|
|
[ ! -z ${dep_list} ] && echo "$1"
|
|
return 0
|
|
fi
|
|
if [ -z ${dep_list} ]; then
|
|
print_mtime "$1" >> ${output}
|
|
cat "$1" >> ${output}
|
|
else
|
|
echo "$1 \\"
|
|
cat "$1" | while read type dir file perm ; do
|
|
if [ "$type" == "file" ]; then
|
|
echo "$file \\";
|
|
fi
|
|
done
|
|
fi
|
|
elif [ -d "$1" ]; then
|
|
dir_filelist "$1"
|
|
else
|
|
echo " ${prog}: Cannot open '$1'" >&2
|
|
exit 1
|
|
fi
|
|
}
|
|
|
|
prog=$0
|
|
root_uid=0
|
|
root_gid=0
|
|
dep_list=
|
|
cpio_file=
|
|
cpio_list=
|
|
output="/dev/stdout"
|
|
output_file=""
|
|
is_cpio_compressed=
|
|
compr="gzip -9 -f"
|
|
|
|
arg="$1"
|
|
case "$arg" in
|
|
"-l") # files included in initramfs - used by kbuild
|
|
dep_list="list_"
|
|
echo "deps_initramfs := $0 \\"
|
|
shift
|
|
;;
|
|
"-o") # generate compressed cpio image named $1
|
|
shift
|
|
output_file="$1"
|
|
cpio_list="$(mktemp ${TMPDIR:-/tmp}/cpiolist.XXXXXX)"
|
|
output=${cpio_list}
|
|
echo "$output_file" | grep -q "\.gz$" && compr="gzip -9 -f"
|
|
echo "$output_file" | grep -q "\.bz2$" && compr="bzip2 -9 -f"
|
|
echo "$output_file" | grep -q "\.lzma$" && compr="lzma -9 -f"
|
|
echo "$output_file" | grep -q "\.lzo$" && compr="lzop -9 -f"
|
|
echo "$output_file" | grep -q "\.cpio$" && compr="cat"
|
|
shift
|
|
;;
|
|
esac
|
|
while [ $# -gt 0 ]; do
|
|
arg="$1"
|
|
shift
|
|
case "$arg" in
|
|
"-u") # map $1 to uid=0 (root)
|
|
root_uid="$1"
|
|
shift
|
|
;;
|
|
"-g") # map $1 to gid=0 (root)
|
|
root_gid="$1"
|
|
shift
|
|
;;
|
|
"-d") # display default initramfs list
|
|
default_list="$arg"
|
|
${dep_list}default_initramfs
|
|
;;
|
|
"-h")
|
|
usage
|
|
exit 0
|
|
;;
|
|
*)
|
|
case "$arg" in
|
|
"-"*)
|
|
unknown_option
|
|
;;
|
|
*) # input file/dir - process it
|
|
input_file "$arg" "$#"
|
|
;;
|
|
esac
|
|
;;
|
|
esac
|
|
done
|
|
|
|
# If output_file is set we will generate cpio archive and compress it
|
|
# we are carefull to delete tmp files
|
|
if [ ! -z ${output_file} ]; then
|
|
if [ -z ${cpio_file} ]; then
|
|
cpio_tfile="$(mktemp ${TMPDIR:-/tmp}/cpiofile.XXXXXX)"
|
|
usr/gen_init_cpio ${cpio_list} > ${cpio_tfile}
|
|
else
|
|
cpio_tfile=${cpio_file}
|
|
fi
|
|
rm ${cpio_list}
|
|
if [ "${is_cpio_compressed}" = "compressed" ]; then
|
|
cat ${cpio_tfile} > ${output_file}
|
|
else
|
|
(cat ${cpio_tfile} | ${compr} - > ${output_file}) \
|
|
|| (rm -f ${output_file} ; false)
|
|
fi
|
|
[ -z ${cpio_file} ] && rm ${cpio_tfile}
|
|
fi
|
|
exit 0
|