modules.d/95iscsi/parse-iscsiroot.sh

   1 #!/bin/sh
   2 #
   3 # Preferred format:
   4 #       root=iscsi:[<servername>]:[<protocol>]:[<port>]:[<LUN>]:<targetname>
   5 #       [root=*] netroot=iscsi:[<servername>]:[<protocol>]:[<port>]:[<LUN>]:<targetname>
   6 #
   7 # Legacy formats:
   8 #       [net]root=[iscsi] iscsiroot=[<servername>]:[<protocol>]:[<port>]:[<LUN>]:<targetname>
   9 #       [net]root=[iscsi] iscsi_firmware
  10 #
  11 # root= takes precedence over netroot= if root=iscsi[...]
  12 #
  13
  14 # Don't continue if root is ok
  15 [ -n "$rootok" ] && return
  16
  17 # This script is sourced, so root should be set. But let's be paranoid
  18 [ -z "$root" ] && root=$(getarg root=)
  19 [ -z "$netroot" ] && netroot=$(getarg netroot=)
  20 [ -z "$iscsiroot" ] && iscsiroot=$(getarg iscsiroot=)
  21 [ -z "$iscsi_firmware" ] && getarg iscsi_firmware && iscsi_firmware="1"
  22
  23 [ -n "$iscsiroot" ] && [ -n "$iscsi_firmware" ] && die "Mixing iscsiroot and iscsi_firmware is dangerous"
  24
  25 # Root takes precedence over netroot
  26 if [ "${root%%:*}" = "iscsi" ] ; then
  27     if [ -n "$netroot" ] ; then
  28         echo "Warning: root takes precedence over netroot. Ignoring netroot"
  29
  30     fi
  31     netroot=$root
  32 fi
  33
  34 # If it's not empty or iscsi we don't continue
  35 [ -z "$netroot" ] || [ "${netroot%%:*}" = "iscsi" ] || return
  36
  37 if [ -n "$iscsiroot" ] ; then
  38     [ -z "$netroot" ]  && netroot=$root
  39
  40     # @deprecated
  41     echo "Warning: Argument isciroot is deprecated and might be removed in a future"
  42     echo "release. See http://apps.sourceforge.net/trac/dracut/wiki/commandline for"
  43     echo "more information."
  44
  45     # Accept iscsiroot argument?
  46     [ -z "$netroot" ] || [ "$netroot" = "iscsi" ] || \
  47         die "Argument iscsiroot only accepted for empty root= or [net]root=iscsi"
  48
  49     # Override root with iscsiroot content?
  50     [ -z "$netroot" ] || [ "$netroot" = "iscsi" ] && netroot=iscsi:$iscsiroot
  51 fi
  52
  53 # iscsi_firmware does not need argument checking
  54 if [ -n "$iscsi_firmware" ] ; then
  55     netroot=${netroot:-iscsi}
  56 fi
  57
  58 # If it's not iscsi we don't continue
  59 [ "${netroot%%:*}" = "iscsi" ] || return
  60
  61 # Check required arguments. there's only one, but it's at the end
  62 if [ -z "$iscsi_firmware" ] ; then
  63     case "${netroot##iscsi:*:*:*:*:}" in
  64         $netroot|'') die "Argument targetname for iscsiroot is missing";;
  65     esac
  66 fi
  67
  68 # ISCSI actually supported?
  69 [ -e /sys/devices/virtual/iscsi_transport ] || modprobe iscsi_tcp || die "iscsiroot requested but kernel/initrd does not support iscsi"
  70
  71 # Done, all good!
  72 rootok=1
  73
  74 # Shut up init error check
  75 [ -z "$root" ] && root="iscsi"