| #!/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. |
| # 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>] [-l <dep_list>] [-u <uid>] [-g <gid>] {-d | <cpio_source>} ... |
| -o <file> Create initramfs file named <file> by using gen_init_cpio |
| -l <dep_list> Create dependency list named <dep_list> |
| -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. |
| -e <type> File metadata type to include in the cpio archive. |
| |
| 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 |
| } |
| |
| 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 |
| } |
| |
| 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}" >> $cpio_list |
| echo "" >> $cpio_list |
| } |
| |
| list_parse() { |
| if [ -z "$dep_list" -o -L "$1" ]; then |
| return |
| fi |
| echo "$1" | sed 's/:/\\:/g; s/$/ \\/' >> $dep_list |
| } |
| |
| # 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}" >> $cpio_list |
| |
| return 0 |
| } |
| |
| unknown_option() { |
| printf "ERROR: unknown option \"$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 |
| } |
| |
| header() { |
| printf "\n#####################\n# $1\n" >> $cpio_list |
| } |
| |
| # process one directory (incl sub-directories) |
| dir_filelist() { |
| header "$1" |
| |
| srcdir=$(echo "$1" | sed -e 's://*:/:g') |
| dirlist=$(find "${srcdir}" -printf "%p %m %U %G\n" | LANG=C sort) |
| |
| # If $dirlist is only one line, then the directory is empty |
| if [ "$(echo "${dirlist}" | wc -l)" -gt 1 ]; then |
| print_mtime "$1" |
| |
| echo "${dirlist}" | \ |
| while read x; do |
| list_parse $x |
| parse $x |
| done |
| fi |
| } |
| |
| input_file() { |
| source="$1" |
| if [ -f "$1" ]; then |
| # If a regular file is specified, assume it is in |
| # gen_init_cpio format |
| header "$1" |
| print_mtime "$1" >> $cpio_list |
| cat "$1" >> $cpio_list |
| if [ -n "$dep_list" ]; then |
| echo "$1 \\" >> $dep_list |
| cat "$1" | while read type dir file perm ; do |
| if [ "$type" = "file" ]; then |
| echo "$file \\" >> $dep_list |
| fi |
| done |
| fi |
| elif [ -d "$1" ]; then |
| # If a directory is specified then add all files in it to fs |
| dir_filelist "$1" |
| else |
| echo " ${prog}: Cannot open '$1'" >&2 |
| exit 1 |
| fi |
| } |
| |
| prog=$0 |
| root_uid=0 |
| root_gid=0 |
| dep_list= |
| cpio_list=$(mktemp ${TMPDIR:-/tmp}/cpiolist.XXXXXX) |
| output="/dev/stdout" |
| |
| trap "rm -f $cpio_list" EXIT |
| |
| while [ $# -gt 0 ]; do |
| arg="$1" |
| shift |
| case "$arg" in |
| "-l") # files included in initramfs - used by kbuild |
| dep_list="$1" |
| echo "deps_initramfs := \\" > $dep_list |
| shift |
| ;; |
| "-o") # generate cpio image named $1 |
| output="$1" |
| shift |
| ;; |
| "-u") # map $1 to uid=0 (root) |
| root_uid="$1" |
| [ "$root_uid" = "-1" ] && root_uid=$(id -u || echo 0) |
| shift |
| ;; |
| "-g") # map $1 to gid=0 (root) |
| root_gid="$1" |
| [ "$root_gid" = "-1" ] && root_gid=$(id -g || echo 0) |
| shift |
| ;; |
| "-e") # file metadata type |
| metadata_arg="-e $1" |
| shift |
| ;; |
| "-h") |
| usage |
| exit 0 |
| ;; |
| *) |
| case "$arg" in |
| "-"*) |
| unknown_option |
| ;; |
| *) # input file/dir - process it |
| input_file "$arg" |
| ;; |
| esac |
| ;; |
| esac |
| done |
| |
| # If output_file is set we will generate cpio archive |
| # we are careful to delete tmp files |
| timestamp= |
| if test -n "$KBUILD_BUILD_TIMESTAMP"; then |
| timestamp="$(date -d"$KBUILD_BUILD_TIMESTAMP" +%s || :)" |
| if test -n "$timestamp"; then |
| timestamp="-t $timestamp" |
| fi |
| fi |
| usr/gen_init_cpio $metadata_arg $timestamp $cpio_list > $output |