FreeBSD/Linux Kernel Cross Reference
sys/scripts/gen_initramfs_list.sh

     #!/bin/sh
     # 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#${srcdir}}"
           # change '//' into '/'
           name=$(echo "$name" | sed -e 's://*:/:g')
           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 -n -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 -n -9 -f"
                   echo "$output_file" | grep -q "\.bz2$" && compr="bzip2 -9 -f"
                   echo "$output_file" | grep -q "\.lzma$" && compr="lzma -9 -f"
                   echo "$output_file" | grep -q "\.xz$" && \
                                   compr="xz --check=crc32 --lzma2=dict=1MiB"
                   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 careful to delete tmp files
   if [ ! -z ${output_file} ]; then
           if [ -z ${cpio_file} ]; then
                   timestamp=
                   if test -n "$KBUILD_BUILD_TIMESTAMP"; then
                           timestamp="$(date -d"$KBUILD_BUILD_TIMESTAMP" +%s || :)"
                           if test -n "$timestamp"; then
                                   timestamp="-t $timestamp"
                           fi
                   fi
                   cpio_tfile="$(mktemp ${TMPDIR:-/tmp}/cpiofile.XXXXXX)"
                   usr/gen_init_cpio $timestamp ${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

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