Mac Easy 2010 May/Mac Life Ubuntu.iso/casper/filesystem.squashfs/usr/src/linux-headers-2.6.28-15/scripts/gen_initramfs_list.sh

Linux/UNIX/POSIX Shell Script | 2008-12-24 | 6.6 KB | 295 lines

#!/bin/bash
# Copyright (C) Martin Schlemmer <[e-mail]>
# Copyright (C) 2006 Sam Ravnborg <[e-mail]>
#
# 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.  "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() {
    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
            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=

arg="$1"
case "$arg" in
    "-l")    # files included in initramfs - used by kbuild
        dep_list="list_"
        echo "deps_initramfs := \\"
        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 ${cpio_list}
    if [ "${is_cpio_compressed}" = "compressed" ]; then
        cat ${cpio_tfile} > ${output_file}
    else
        cat ${cpio_tfile} | gzip -f -9 - > ${output_file}
    fi
    [ -z ${cpio_file} ] && rm ${cpio_tfile}
fi
exit 0