package/base-files/default/lib/config/uci-update.awk

   1 # Configuration update functions
   2 #
   3 # Copyright (C) 2006 by Fokus Fraunhofer <carsten.tittel@fokus.fraunhofer.de>
   4 # Copyright (C) 2006 by Felix Fietkau <nbd@openwrt.org>
   5 #
   6 # This program is free software; you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation; either version 2 of the License, or
   9 # (at your option) any later version.
  10 #
  11 # This program is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14 # General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License
  17 # along with this program; if not, write to the Free Software
  18 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  19
  20
  21 function read_file(filename,  result) {
  22         while ((getline <filename) == 1) {
  23                 result = result $0 "\n"
  24         }
  25         gsub(/\n*$/, "", result)
  26         return result
  27 }
  28
  29 function cmd2option(str,  tmp) {
  30         if (match(str,"=")!=0) {
  31                 res = "\toption " substr(str,1,RSTART-1) "\t'" substr(str,RSTART+1) "'"
  32         } else {
  33                 res= ""
  34         }
  35         return res
  36 }
  37
  38 function cmd2config(atype,  aname) {
  39         return "config \"" atype "\" \"" aname "\""
  40 }
  41
  42 function update_config(cfg, update,  \
  43   lines, line, l, n, i, i2, section, scnt, remove, tmp, aidx, rest) {
  44         scnt = 1
  45         linecnt=split(cfg "\n", lines, "\n")
  46
  47         cfg = ""
  48         for (n = 1; n < linecnt; n++) {
  49                 # stupid parser for quoted arguments (e.g. for the type string).
  50                 # not to be used to gather variable values (backslash escaping doesn't work)
  51                 line = lines[n]
  52                 gsub(/^[ \t]*/, "", line)
  53                 gsub(/#.*$/, "", line)
  54                 i2 = 1
  55                 delete l
  56                 rest = line
  57                 while (length(rest)) {
  58                         if (match(rest, /[ \t\"]+/)) {
  59                                 if (RSTART>1) {
  60                                         l[i2] = substr(rest,1,RSTART-1)
  61                                         i2++
  62                                 }
  63                                 aidx=index(rest,"\"")
  64                                 if (aidx>=RSTART && aidx<=RSTART+RLENGTH) {
  65                                         rest=substr(rest,aidx+1)
  66                                         # find the end of the string
  67                                         match(rest,/\"/)
  68                                         l[i2]=substr(rest,1,RSTART-1)
  69                                         i2++
  70                                 }
  71                                 rest=substr(rest,RSTART+RLENGTH)
  72                         } else {
  73                                 l[i2] = rest
  74                                 i2++
  75                                 rest = ""
  76                         }
  77                 }
  78                 line = lines[n]
  79
  80                 # when a command wants to set a config value for the current
  81                 # section and a blank line is encountered before an option with
  82                 # the same name, insert it here to maintain some coherency between
  83                 # manually and automatically created option lines
  84                 # if an option with the same name appears after this point, simply
  85                 # ignore it, because it is already set.
  86                 if ((section != "") && (l[1] != "option")) {
  87                         if (line ~ /^[ \t]*$/) {
  88                                 if (update ~ "^" section "\\.") {
  89                                         gsub("^" section ".", "", update)
  90                                         cfg = cfg cmd2option(update) "\n"
  91                                         gsub(/=.*$/, "", update)
  92                                         update = "-" section "." update
  93                                 }
  94                         }
  95                 }
  96
  97                 if (l[1] == "config") {
  98                         # look for all unset values
  99                         if (section != "") {
 100                                 flag=0
 101                                 if (update ~ "^" section "\\.") {
 102                                         flag=1
 103                                         gsub("^" section ".", "", update)
 104                                         cfg = cfg cmd2option(update) "\n"
 105
 106                                         update = "-" section "." update
 107                                 }
 108                                 if (flag!=0) cfg = cfg "\n"
 109                         }
 110
 111                         remove = ""
 112                         section = l[3]
 113                         if (!length(section)) {
 114                                 section = "cfg" scnt
 115                         }
 116                         scnt++
 117                         if (update == "-" section) {
 118                                 remove = "section"
 119                                 update = ""
 120                         } else if (update ~ "^@" section "=") {
 121                                 update = ""
 122                         } else if (update ~ "^&" section "=") {
 123                                 gsub("^&" section "=", "", update)
 124                                 line = cmd2config(l[2],update)
 125                                 update = ""
 126                         }
 127                 }
 128                 if (remove == "option") remove = ""
 129                 if (l[1] == "option") {
 130                         if (update ~ "^-" section "\\." l[2] "$") remove = "option"
 131                         # if a supplied config value already exists, replace the whole line
 132                         if (match(update, "^" section "." l[2] "=")) {
 133                                 gsub("^" section ".", "", update)
 134                                 line = cmd2option(update)
 135                                 update = ""
 136                         }
 137                 }
 138                 if (remove == "") cfg = cfg line "\n"
 139         }
 140
 141         # any new options for the last section??
 142         if (section != "") {
 143                 if (update ~ "^" section "\\.") {
 144                         gsub("^" section ".", "", update)
 145                         cfg = cfg cmd2option(update) "\n"
 146
 147                         update = "-" section "." update
 148                 }
 149         }
 150
 151         if (update ~ "^@") {
 152                 # new section
 153                 section = stype = substr(update,2)
 154                 gsub(/=.*$/,"",section)
 155                 gsub(/^.*=/,"",stype)
 156                 cfg = cfg "\nconfig \"" stype "\" \"" section "\"\n"
 157         }
 158
 159         return cfg
 160 }