modules.d/40network/parse-bridge.sh

   1 #!/bin/sh
   2 # -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
   3 # ex: ts=8 sw=4 sts=4 et filetype=sh
   4 #
   5 # Format:
   6 #       bridge=<bridgename>:<ethnames>
   7 #
   8 #       <ethnames> is a comma-separated list of physical (ethernet) interfaces
   9 #       bridge without parameters assumes bridge=br0:eth0
  10 #
  11
  12 # return if bridge already parsed
  13 [ -n "$bridgename" ] && return
  14
  15 # Check if bridge parameter is valid
  16 if getarg bridge= >/dev/null ; then
  17     command -v brctl >/dev/null 2>&1 || die "No 'brctl' installed"
  18 fi
  19
  20 parsebridge() {
  21     local v=${1}:
  22     set --
  23     while [ -n "$v" ]; do
  24         set -- "$@" "${v%%:*}"
  25         v=${v#*:}
  26     done
  27
  28     unset bridgename ethnames
  29     case $# in
  30         0)  bridgename=br0; ethnames=$iface ;;
  31         1)  die "bridge= requires two parameters" ;;
  32         2)  bridgename=$1; ethnames=$(str_replace "$2" "," " ") ;;
  33         *)  die "bridge= requires two parameters" ;;
  34     esac
  35 }
  36
  37 unset bridgename ethnames
  38
  39 iface=eth0
  40 if [ -e /tmp/bond.info ]; then
  41     . /tmp/bond.info
  42     if [ -n "$bondname" ] ; then
  43         iface=$bondname
  44     fi
  45 fi
  46
  47 # Parse bridge for bridgename and ethnames
  48 if bridge="$(getarg bridge)"; then
  49     # Read bridge= parameters if they exist
  50     if [ -n "$bridge" ]; then
  51         parsebridge $bridge
  52     fi
  53     # Simple default bridge
  54     if [ -z "$bridgename" ]; then
  55         bridgename=br0
  56         ethnames=$iface
  57     fi
  58     echo "bridgename=$bridgename" > /tmp/bridge.info
  59     echo "ethnames=\"$ethnames\"" >> /tmp/bridge.info
  60     return
  61 fi