#!/bin/bash# Copyright (C) Martin Schlemmer <azarah@nosferatu.za.org># Released under the terms of the GNU GPL## Generate a newline separated list of entries from the file/directory# supplied as an argument.## If a file/directory is not supplied then generate a small dummy file.## The output is suitable for gen_init_cpio built from usr/gen_init_cpio.c.# default_initramfs() {	cat <<-EOF		# 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	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} print_mtime() {	local argv1="$1"	local my_mtime="0" 	if [ -e "${argv1}" ]; then		my_mtime=$(find "${argv1}" -printf "%T@\n" | sort -r | head -n 1)	fi		echo "# Last modified: ${my_mtime}"	echo} 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}" 	return 0} usage() {	printf    "Usage:\n"	printf    "$0 [ [-u <root_uid>] [-g <root_gid>] [-d | <cpio_source>] ] . . .\n"	printf    "\n"	printf -- "-u <root_uid>  User ID to map to user ID 0 (root).\n"	printf    "               <root_uid> is only meaningful if <cpio_source>\n"	printf    "               is a directory.\n"	printf -- "-g <root_gid>  Group ID to map to group ID 0 (root).\n"	printf    "               <root_gid> is only meaningful if <cpio_source>\n"	printf    "               is a directory.\n"	printf    "<cpio_source>  File list or directory for cpio archive.\n"	printf    "               If <cpio_source> is not provided then a\n"	printf    "               a default list will be output.\n"	printf -- "-d             Output the default cpio list.  If no <cpio_source>\n"	printf    "               is given then the default cpio list will be output.\n"	printf    "\n"	printf    "All options may be repeated and are interpreted sequentially\n"	printf    "and immediately.  -u and -g states are preserved across\n"	printf    "<cpio_source> options so an explicit \"-u 0 -g 0\" is required\n"	printf    "to reset the root/group mapping.\n"} build_list() {	printf "\n#####################\n# $cpio_source\n" 	if [ -f "$cpio_source" ]; then		print_mtime "$cpio_source"		cat "$cpio_source"	elif [ -d "$cpio_source" ]; then		srcdir=$(echo "$cpio_source" | sed -e 's://*:/:g')		dirlist=$(find "${srcdir}" -printf "%p %m %U %G\n" 2>/dev/null) 		# If $dirlist is only one line, then the directory is empty		if [  "$(echo "${dirlist}" | wc -l)" -gt 1 ]; then			print_mtime "$cpio_source"					echo "${dirlist}" | \			while read x; do				parse ${x}			done		else			# Failsafe in case directory is empty			default_initramfs		fi	else		echo "  $0: Cannot open '$cpio_source'" >&2		exit 1	fi}  root_uid=0root_gid=0 while [ $# -gt 0 ]; do	arg="$1"	shift	case "$arg" in		"-u")			root_uid="$1"			shift			;;		"-g")			root_gid="$1"			shift			;;		"-d")			default_list="$arg"			default_initramfs			;;		"-h")			usage			exit 0			;;		*)			case "$arg" in				"-"*)					printf "ERROR: unknown option \"$arg\"\n" >&2					printf "If the filename validly begins with '-', 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					;;				*)					cpio_source="$arg"					build_list					;;			esac			;;	esacdone # spit out the default cpio list if a source hasn't been specified[ -z "$cpio_source" -a -z "$default_list" ] && default_initramfs exit 0