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#!/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 gzip to pack 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 gzipped initramfs file named <file> using
gen_init_cpio and gzip
-u <uid> User ID to map to user ID 0 (root).
<uid> is only meaningful if <cpio_source>
is a directory.
-g <gid> Group ID to map to group ID 0 (root).
<gid> is only meaningful if <cpio_source>
is a directory.
<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
}
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() {
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 "${location}")
# remap uid/gid to 0 if necessary
[ "$uid" -eq "$root_uid" ] && uid=0
[ "$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} ${str}"
;;
"nod")
local dev_type=
local maj=$(LC_ALL=C ls -l "${location}" | \
gawk '{sub(/,/, "", $5); print $5}')
local min=$(LC_ALL=C ls -l "${location}" | \
gawk '{print $6}')
if [ -b "${location}" ]; then
dev_type="b"
else
dev_type="c"
fi
str="${ftype} ${name} ${str} ${dev_type} ${maj} ${min}"
;;
"slink")
local target=$(LC_ALL=C ls -l "${location}" | \
gawk '{print $11}')
str="${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() {
echo "deps_initramfs := \\"
}
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" 2>/dev/null)
# 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
[ ! -z ${dep_list} ] && echo "$1"
return 0
fi
if [ -z ${dep_list} ]; then
print_mtime "$1" >> ${output}
cat "$1" >> ${output}
else
grep ^file "$1" | cut -d ' ' -f 3
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=""
arg="$1"
case "$arg" in
"-l") # files included in initramfs - used by kbuild
dep_list="list_"
shift
;;
"-o") # generate gzipped cpio image named $1
shift
output_file="$1"
cpio_list="$(mktemp ${TMPDIR:-/tmp}/cpiolist.XXXXXX)"
output=${cpio_list}
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 gzip 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}
cat ${cpio_tfile} | gzip -f -9 - > ${output_file}
[ -z ${cpio_file} ] && rm ${cpio_tfile}
fi
exit 0
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