src/scripts/readhash

   1 #!/bin/sh
   2 #
   3 # This script reads in variables from a config file, and produces a list of
   4 # commands to run to set these as shell environment variables, it is
   5 # intended to be used as follows:
   6 #
   7 #   eval $(readhash /var/ipfire/main/settings)
   8 #
   9
  10 # shell variables must consist of alphanumeric characters and underscores,
  11 # and begin with an alphabetic character or underscore.
  12 VARNAME='[A-Za-z_][A-Za-z0-9_]*'
  13
  14 # For the assigned value we only accept a limited number of characters - none
  15 # of which are shell metachars
  16 VARCHARS='A-Za-z0-9=/,.:%_@#+-'
  17 VARVAL="[${VARCHARS}]*"
  18
  19 sed -ne "s/\(${VARNAME}\)=\(${VARVAL}\)$/\1=\2/p" $1
  20
  21 # Accept space only if it's quoted
  22 sed -ne "s/\(${VARNAME}\)=\('[ ${VARCHARS}]*'\)$/\1=\2/p" $1