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

//openwrt\package\base-files\files\lib\function.sh

其中定义的主要函数功能如下：

 

 //源码：

 

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#!/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