openwrt /lib/function.sh

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本文介绍了一个用于OpenWrt系统的配置脚本，详细解释了如何使用config、config_get等函数来设置和获取配置项。这些函数对于管理和维护OpenWrt系统至关重要。
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/lib/function.sh
#!/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 name
    name=$(echo $(basename $1) | cut -d. -f1)
    [ -f /usr/lib/opkg/info/${name}.prerm-pkg ] && . /usr/lib/opkg/info/${name}.prerm-pkg
    for i in `cat /usr/lib/opkg/info/${name}.list | grep "^/etc/init.d/"`; do
        $i disable
        $i stop
    done
}

default_postinst() {
    local pkgname rusers
    pkgname=$(echo $(basename $1) | cut -d. -f1)
    rusers=$(grep "Require-User:" ${IPKG_INSTROOT}/usr/lib/opkg/info/${pkgname}.control)
    [ -n "$rusers" ] && {
        local user group uid gid
        for a in $(echo $rusers | sed "s/Require-User://g"); do
            user=""
            group=""
            for b in $(echo $a | sed "s/:/ /g"); do
                local ugname ugid

                ugname=$(echo $b | cut -d= -f1)
                ugid=$(echo $b | cut -d= -f2)

                [ -z "$user" ] && {
                    user=$ugname
                    uid=$ugid
                    continue
                }

                gid=$ugid
                [ -n "$gid" ] && {
                    group_exists $ugname || group_add $ugname $gid
                }

                [ -z "$gid" ] && {
                    group_add_next $ugname
                    gid=$?
                }

                [ -z "$group" ] && {
                    user_exists $user || user_add $user "$uid" $gid
                    group=$ugname
                    continue
                }

                group_add_user $ugname $user
            done
        done
    }

    [ -f ${IPKG_INSTROOT}/usr/lib/opkg/info/${pkgname}.postinst-pkg ] && ( . ${IPKG_INSTROOT}/usr/lib/opkg/info/${pkgname}.postinst-pkg )
    [ -n "${IPKG_INSTROOT}" ] || rm -f /tmp/luci-indexcache 2>/dev/null

    [ "$PKG_UPGRADE" = "1" ] || for i in `cat ${IPKG_INSTROOT}/usr/lib/opkg/info/${pkgname}.list | grep "^/etc/init.d/"`; do
        [ -n "${IPKG_INSTROOT}" ] && $(which bash) ${IPKG_INSTROOT}/etc/rc.common ${IPKG_INSTROOT}$i enable; \
        [ -n "${IPKG_INSTROOT}" ] || {
            $i enable
            $i start
        }
    done
    return 0
}

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}:" >> ${IPKG_INSTROOT}/etc/group
    rc=$?
    [ -n "$IPKG_INSTROOT" ] || lock -u /var/lock/group
    return $rc
}

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

group_add_next() {
    local gid gids
    gid=$(grep -s "^${1}:" ${IPKG_INSTROOT}/etc/group | cut -d: -f3)
    [ -n "$gid" ] && return $gid
    gids=$(cat ${IPKG_INSTROOT}/etc/group | cut -d: -f3)
    gid=100
    while [ -n "$(echo $gids | grep $gid)" ] ; do
            gid=$((gid + 1))
    done
    group_add $1 $gid
    return $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 ${IPKG_INSTROOT}/etc/passwd | cut -d: -f3)
        uid=100
        while [ -n "$(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:::" >> ${IPKG_INSTROOT}/etc/shadow
    rc=$?
    [ -n "$IPKG_INSTROOT" ] || lock -u /var/lock/passwd
    return $rc
}

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

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