package/base-files/files/lib/config/uci.sh

   1 #!/bin/sh
   2 # Shell script defining macros for manipulating config files
   3 #
   4 # Copyright (C) 2006        Fokus Fraunhofer <carsten.tittel@fokus.fraunhofer.de>
   5 # Copyright (C) 2006,2007   Felix Fietkau <nbd@openwrt.org>
   6 #
   7 # This program is free software; you can redistribute it and/or modify
   8 # it under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation; either version 2 of the License, or
  10 # (at your option) any later version.
  11 #
  12 # This program is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15 # General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU General Public License
  18 # along with this program; if not, write to the Free Software
  19 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20
  21 uci_load() {
  22         local PACKAGE="$1"
  23         config_load "$PACKAGE"
  24         local PACKAGE_BASE="$(basename "$PACKAGE")"
  25         [ -f "/tmp/.uci/${PACKAGE_BASE}" ] && {
  26                 . "/tmp/.uci/${PACKAGE_BASE}" 2>/dev/null >/dev/null
  27                 config_cb
  28         }
  29 }
  30
  31 uci_apply_defaults() {(
  32         cd /etc/uci-defaults || return 0
  33         files="$(ls)"
  34         [ -z "$files" ] && return 0
  35         mkdir -p /tmp/.uci
  36         for file in $files; do
  37                 ( . "./$(basename $file)" ) && rm -f "$file"
  38         done
  39         uci commit
  40 )}
  41
  42 uci_call_awk() {
  43         local CMD="$*"
  44         awk -f $UCI_ROOT/lib/config/uci.awk -f - <<EOF
  45 BEGIN {
  46         $CMD
  47 }
  48 EOF
  49 }
  50
  51 uci_do_update() {
  52         local FILENAME="$1"
  53         local UPDATE="$2"
  54         uci_call_awk "
  55         config = read_file(\"$FILENAME\")
  56         $UPDATE
  57         print config
  58 "
  59 }
  60
  61 uci_add_update() {
  62         local PACKAGE="$1"
  63         local UPDATE="$2"
  64         local PACKAGE_BASE="$(basename "$PACKAGE")"
  65         local UCIFILE
  66
  67         case "$PACKAGE" in
  68                 /*) UCIFILE="$PACKAGE";;
  69                 *)
  70                         UCIDIR="/tmp/.uci/$PACKAGE_BASE"
  71                         mkdir -p "/tmp/.uci"
  72                 ;;
  73         esac
  74
  75         # FIXME: add locking?
  76         echo "$UPDATE" >> "$UCIFILE"
  77 }
  78
  79 uci_set() {
  80         local PACKAGE="$1"
  81         local CONFIG="$2"
  82         local OPTION="$3"
  83         local VALUE="$4"
  84
  85         case "$PACKAGE" in
  86                 /*)
  87                         uci_add_update "$PACKAGE" "config_set '$CONFIG' '$OPTION' '$VALUE'"
  88                 ;;
  89                 *)
  90                         ( # spawn a subshell so you don't mess up the current environment
  91                                 uci_load "$PACKAGE"
  92                                 config_get OLDVAL "$CONFIG" "$OPTION"
  93                                 if [ "$OLDVAL" != "$VALUE" ]; then
  94                                         config_get type "$CONFIG" TYPE
  95                                         [ -z "$type" ]
  96                                 fi
  97                         ) || uci_add_update "$PACKAGE" "config_set '$CONFIG' '$OPTION' '$VALUE'"
  98                 ;;
  99         esac
 100 }
 101
 102 uci_add() {
 103         local PACKAGE="$1"
 104         local TYPE="$2"
 105         local CONFIG="$3"
 106
 107         uci_add_update "$PACKAGE" "config '$TYPE' '$CONFIG'"
 108 }
 109
 110 uci_rename() {
 111         local PACKAGE="$1"
 112         local CONFIG="$2"
 113         local VALUE="$3"
 114
 115         uci_add_update "$PACKAGE" "config_rename '$CONFIG' '$VALUE'"
 116 }
 117
 118 uci_remove() {
 119         local PACKAGE="$1"
 120         local CONFIG="$2"
 121         local OPTION="$3"
 122
 123         if [ -z "$OPTION" ]; then
 124                 uci_add_update "$PACKAGE" "config_clear '$CONFIG'"
 125         else
 126                 uci_add_update "$PACKAGE" "config_unset '$CONFIG' '$OPTION'"
 127         fi
 128 }
 129
 130 uci_commit() {
 131         local PACKAGE="$1"
 132         local PACKAGE_BASE="$(basename "$PACKAGE")"
 133
 134         case "$PACKAGE" in
 135                 /*) return 0;;
 136         esac
 137         mkdir -p /tmp/.uci
 138         LOCK=`which lock` || LOCK=:
 139         $LOCK "/tmp/.uci/$PACKAGE_BASE.lock"
 140         [ -f "/tmp/.uci/$PACKAGE_BASE" ] && (
 141                 updatestr=""
 142
 143                 # replace handlers
 144                 config() {
 145                         append updatestr "config = uci_update_config(config, \"@$2=$1\")" "$N"
 146                 }
 147                 option() {
 148                         append updatestr "config = uci_update_config(config, \"$CONFIG_SECTION.$1=$2\")" "$N"
 149                 }
 150                 config_rename() {
 151                         append updatestr "config = uci_update_config(config, \"&$1=$2\")" "$N"
 152                 }
 153                 config_unset() {
 154                         append updatestr "config = uci_update_config(config, \"-$1.$2\")" "$N"
 155                 }
 156                 config_clear() {
 157                         append updatestr "config = uci_update_config(config, \"-$1\")" "$N"
 158                 }
 159
 160                 . "/tmp/.uci/$PACKAGE_BASE"
 161
 162                 # completely disable handlers so that they don't get in the way
 163                 config() {
 164                         return 0
 165                 }
 166                 option() {
 167                         return 0
 168                 }
 169
 170                 config_load "$PACKAGE"
 171                 CONFIG_FILENAME="${CONFIG_FILENAME:-$UCI_ROOT/etc/config/$PACKAGE_BASE}"
 172                 uci_do_update "$CONFIG_FILENAME" "$updatestr" > "/tmp/.uci/$PACKAGE_BASE.new" && {
 173                         mv -f "/tmp/.uci/$PACKAGE_BASE.new" "$CONFIG_FILENAME" && \
 174                         rm -f "/tmp/.uci/$PACKAGE_BASE"
 175                 }
 176         )
 177         $LOCK -u "/tmp/.uci/$PACKAGE_BASE.lock"
 178 }
 179
 180