uci文件生成脚本函数说明

/etc/config下的uci配置文件都是动态生成的，每个脚本文件对应一个uci配置文件

/etc/init.d目录下的脚本调用function.sh中的一些函数去修改/etc/config下的uci配置文件

//openwrtpackagease-filesfileslibfunction.sh

其中定义的主要函数功能如下：

 //源码：

#!/bin/sh
# Copyright (C) 2006-2014 OpenWrt.org
# Copyright (C) 2006 Fokus Fraunhofer <carsten.tittel@fokus.fraunhofer.de>
# Copyright (C) 2010 Vertical Communications


debug () {
	${DEBUG:-:} "$@"
}

# newline
N="
"

_C=0
NO_EXPORT=1
LOAD_STATE=1
LIST_SEP=" "

append() {
	local var="$1"
	local value="$2"
	local sep="${3:- }"

	eval "export ${NO_EXPORT:+-n} -- "$var=${$var:+${$var}${value:+$sep}}$value""
}

list_contains() {
	local var="$1"
	local str="$2"
	local val

	eval "val=" ${$var} ""
	[ "${val%% $str *}" != "$val" ]
}

config_load() {
	[ -n "$IPKG_INSTROOT" ] && return 0
	uci_load "$@"
}

reset_cb() {
	config_cb() { return 0; }
	option_cb() { return 0; }
	list_cb() { return 0; }
}
reset_cb

package() {
	return 0
}

config () {
	local cfgtype="$1"
	local name="$2"

	export ${NO_EXPORT:+-n} CONFIG_NUM_SECTIONS=$(($CONFIG_NUM_SECTIONS + 1))
	name="${name:-cfg$CONFIG_NUM_SECTIONS}"
	append CONFIG_SECTIONS "$name"
	[ -n "$NO_CALLBACK" ] || config_cb "$cfgtype" "$name"
	export ${NO_EXPORT:+-n} CONFIG_SECTION="$name"
	export ${NO_EXPORT:+-n} "CONFIG_${CONFIG_SECTION}_TYPE=$cfgtype"
}

option () {
	local varname="$1"; shift
	local value="$*"

	export ${NO_EXPORT:+-n} "CONFIG_${CONFIG_SECTION}_${varname}=$value"
	[ -n "$NO_CALLBACK" ] || option_cb "$varname" "$*"
}

list() {
	local varname="$1"; shift
	local value="$*"
	local len

	config_get len "$CONFIG_SECTION" "${varname}_LENGTH" 0
	[ $len = 0 ] && append CONFIG_LIST_STATE "${CONFIG_SECTION}_${varname}"
	len=$(($len + 1))
	config_set "$CONFIG_SECTION" "${varname}_ITEM$len" "$value"
	config_set "$CONFIG_SECTION" "${varname}_LENGTH" "$len"
	append "CONFIG_${CONFIG_SECTION}_${varname}" "$value" "$LIST_SEP"
	list_cb "$varname" "$*"
}

config_unset() {
	config_set "$1" "$2" ""
}

# config_get <variable> <section> <option> [<default>]
# config_get <section> <option>
config_get() {
	case "$3" in
		"") eval echo "${CONFIG_${1}_${2}:-${4}}";;
		*)  eval export ${NO_EXPORT:+-n} -- "${1}=${CONFIG_${2}_${3}:-${4}}";;
	esac
}

# config_get_bool <variable> <section> <option> [<default>]
config_get_bool() {
	local _tmp
	config_get _tmp "$2" "$3" "$4"
	case "$_tmp" in
		1|on|true|yes|enabled) _tmp=1;;
		0|off|false|no|disabled) _tmp=0;;
		*) _tmp="$4";;
	esac
	export ${NO_EXPORT:+-n} "$1=$_tmp"
}

config_set() {
	local section="$1"
	local option="$2"
	local value="$3"
	local old_section="$CONFIG_SECTION"

	CONFIG_SECTION="$section"
	option "$option" "$value"
	CONFIG_SECTION="$old_section"
}

config_foreach() {
	local ___function="$1"
	[ "$#" -ge 1 ] && shift
	local ___type="$1"
	[ "$#" -ge 1 ] && shift
	local section cfgtype

	[ -z "$CONFIG_SECTIONS" ] && return 0
	for section in ${CONFIG_SECTIONS}; do
		config_get cfgtype "$section" TYPE
		[ -n "$___type" -a "x$cfgtype" != "x$___type" ] && continue
		eval "$___function "$section" "$@""
	done
}

config_list_foreach() {
	[ "$#" -ge 3 ] || return 0
	local section="$1"; shift
	local option="$1"; shift
	local function="$1"; shift
	local val
	local len
	local c=1

	config_get len "${section}" "${option}_LENGTH"
	[ -z "$len" ] && return 0
	while [ $c -le "$len" ]; do
		config_get val "${section}" "${option}_ITEM$c"
		eval "$function "$val" "$@""
		c="$(($c + 1))"
	done
}

insert_modules() {
	for m in $*; do
		if [ -f /etc/modules.d/$m ]; then
			sed 's/^[^#]/insmod &/' /etc/modules.d/$m | ash 2>&- || :
		else
			modprobe $m
		fi
	done
}

default_prerm() {
	local root="${IPKG_INSTROOT}"
	local name

	name=$(basename ${1%.*})
	[ -f "$root/usr/lib/opkg/info/${name}.prerm-pkg" ] && . "$root/usr/lib/opkg/info/${name}.prerm-pkg"

	local shell="$(which bash)"
	for i in `cat "$root/usr/lib/opkg/info/${name}.list" | grep "^/etc/init.d/"`; do
		if [ -n "$root" ]; then
			${shell:-/bin/sh} "$root/etc/rc.common" "$root$i" disable
		else
			if [ "$PKG_UPGRADE" != "1" ]; then
				"$i" disable
			fi
			"$i" stop || /bin/true
		fi
	done
}

add_group_and_user() {
	local pkgname="$1"
	local rusers="$(sed -ne 's/^Require-User: *//p' $root/usr/lib/opkg/info/${pkgname}.control 2>/dev/null)"

	if [ -n "$rusers" ]; then
		local tuple oIFS="$IFS"
		for tuple in $rusers; do
			local uid gid uname gname

			IFS=":"
			set -- $tuple; uname="$1"; gname="$2"
			IFS="="
			set -- $uname; uname="$1"; uid="$2"
			set -- $gname; gname="$1"; gid="$2"
			IFS="$oIFS"

			if [ -n "$gname" ] && [ -n "$gid" ]; then
				group_exists "$gname" || group_add "$gname" "$gid"
			elif [ -n "$gname" ]; then
				gid="$(group_add_next "$gname")"
			fi

			if [ -n "$uname" ]; then
				user_exists "$uname" || user_add "$uname" "$uid" "$gid"
			fi

			if [ -n "$uname" ] && [ -n "$gname" ]; then
				group_add_user "$gname" "$uname"
			fi

			unset uid gid uname gname
		done
	fi
}

default_postinst() {
	local root="${IPKG_INSTROOT}"
	local pkgname="$(basename ${1%.*})"
	local ret=0

	add_group_and_user "${pkgname}"

	if [ -f "$root/usr/lib/opkg/info/${pkgname}.postinst-pkg" ]; then
		( . "$root/usr/lib/opkg/info/${pkgname}.postinst-pkg" )
		ret=$?
	fi

	if [ -d "$root/rootfs-overlay" ]; then
		cp -R $root/rootfs-overlay/. $root/
		rm -fR $root/rootfs-overlay/
	fi

	if [ -z "$root" ] && grep -q -s "^/etc/modules.d/" "/usr/lib/opkg/info/${pkgname}.list"; then
		kmodloader
	fi

	if [ -z "$root" ] && grep -q -s "^/etc/uci-defaults/" "/usr/lib/opkg/info/${pkgname}.list"; then
		. /lib/functions/system.sh
		[ -d /tmp/.uci ] || mkdir -p /tmp/.uci
		for i in $(sed -ne 's!^/etc/uci-defaults/!!p' "/usr/lib/opkg/info/${pkgname}.list"); do (
			cd /etc/uci-defaults
			[ -f "$i" ] && . ./"$i" && rm -f "$i"
		) done
		uci commit
	fi

	[ -n "$root" ] || rm -f /tmp/luci-indexcache 2>/dev/null

	local shell="$(which bash)"
	for i in $(grep -s "^/etc/init.d/" "$root/usr/lib/opkg/info/${pkgname}.list"); do
		if [ -n "$root" ]; then
			${shell:-/bin/sh} "$root/etc/rc.common" "$root$i" enable
		else
			if [ "$PKG_UPGRADE" != "1" ]; then
				"$i" enable
			fi
			"$i" start
		fi
	done

	return $ret
}

include() {
	local file

	for file in $(ls $1/*.sh 2>/dev/null); do
		. $file
	done
}

find_mtd_index() {
	local PART="$(grep ""$1"" /proc/mtd | awk -F: '{print $1}')"
	local INDEX="${PART##mtd}"

	echo ${INDEX}
}

find_mtd_part() {
	local INDEX=$(find_mtd_index "$1")
	local PREFIX=/dev/mtdblock

	[ -d /dev/mtdblock ] && PREFIX=/dev/mtdblock/
	echo "${INDEX:+$PREFIX$INDEX}"
}

group_add() {
	local name="$1"
	local gid="$2"
	local rc
	[ -f "${IPKG_INSTROOT}/etc/group" ] || return 1
	[ -n "$IPKG_INSTROOT" ] || lock /var/lock/group
	echo "${name}:x:${gid}:" >> ${IPKG_INSTROOT}/etc/group
	[ -n "$IPKG_INSTROOT" ] || lock -u /var/lock/group
}

group_exists() {
	grep -qs "^${1}:" ${IPKG_INSTROOT}/etc/group
}

group_add_next() {
	local gid gids
	gid=$(grep -s "^${1}:" ${IPKG_INSTROOT}/etc/group | cut -d: -f3)
	if [ -n "$gid" ]; then
		echo $gid
		return
	fi
	gids=$(cat ${IPKG_INSTROOT}/etc/group | cut -d: -f3)
	gid=65536
	while [ -n "$(echo "$gids" | grep "^$gid$")" ] ; do
	        gid=$((gid + 1))
	done
	group_add $1 $gid
	echo $gid
}

group_add_user() {
	local grp delim=","
	grp=$(grep -s "^${1}:" ${IPKG_INSTROOT}/etc/group)
	[ -z "$(echo $grp | cut -d: -f4 | grep $2)" ] || return
	[ -n "$(echo $grp | grep ":$")" ] && delim=""
	[ -n "$IPKG_INSTROOT" ] || lock /var/lock/passwd
	sed -i "s/$grp/$grp$delim$2/g" ${IPKG_INSTROOT}/etc/group
	[ -n "$IPKG_INSTROOT" ] || lock -u /var/lock/passwd
}

user_add() {
	local name="${1}"
	local uid="${2}"
	local gid="${3}"
	local desc="${4:-$1}"
	local home="${5:-/var/run/$1}"
	local shell="${6:-/bin/false}"
	local rc
	[ -z "$uid" ] && {
		uids=$(cat ${IPKG_INSTROOT}/etc/passwd | cut -d: -f3)
		uid=65536
		while [ -n "$(echo "$uids" | grep "^$uid$")" ] ; do
		        uid=$((uid + 1))
		done
	}
	[ -z "$gid" ] && gid=$uid
	[ -f "${IPKG_INSTROOT}/etc/passwd" ] || return 1
	[ -n "$IPKG_INSTROOT" ] || lock /var/lock/passwd
	echo "${name}:x:${uid}:${gid}:${desc}:${home}:${shell}" >> ${IPKG_INSTROOT}/etc/passwd
	echo "${name}:x:0:0:99999:7:::" >> ${IPKG_INSTROOT}/etc/shadow
	[ -n "$IPKG_INSTROOT" ] || lock -u /var/lock/passwd
}

user_exists() {
	grep -qs "^${1}:" ${IPKG_INSTROOT}/etc/passwd
}

board_name() {
	[ -e /tmp/sysinfo/board_name ] && cat /tmp/sysinfo/board_name || echo "generic"
}

[ -z "$IPKG_INSTROOT" -a -f /lib/config/uci.sh ] && . /lib/config/uci.sh