modules.d/95nfs/parse-nfsroot.sh

   1 #!/bin/sh
   2 #
   3 # Preferred format:
   4 #       root=nfs[4]:[server:]path[:options]
   5 #
   6 # This syntax can come from DHCP root-path as well.
   7 #
   8 # Legacy format:
   9 #       root=/dev/nfs nfsroot=[server:]path[,options]
  10 #
  11 # In Legacy root=/dev/nfs mode, if the 'nfsroot' parameter is not given
  12 # on the command line or is empty, the dhcp root-path is used as
  13 # [server:]path[:options] or the default "/tftpboot/%s" will be used.
  14 #
  15 # If server is unspecified it will be pulled from one of the following
  16 # sources, in order:
  17 #       static ip= option on kernel command line
  18 #       DHCP next-server option
  19 #       DHCP server-id option
  20 #       DHCP root-path option
  21 #
  22 # NFSv4 is only used if explicitly requested with nfs4: prefix, otherwise
  23 # NFSv3 is used.
  24 #
  25
  26 type getarg >/dev/null 2>&1 || . /lib/dracut-lib.sh
  27
  28 # This script is sourced, so root should be set. But let's be paranoid
  29 [ -z "$root" ] && root=$(getarg root=)
  30 [ -z "$nfsroot" ] && nfsroot=$(getarg nfsroot=)
  31
  32 [ -n "$netroot" ] && oldnetroot="$netroot"
  33
  34 # netroot= cmdline argument must be ignored, but must be used if
  35 # we're inside netroot to parse dhcp root-path
  36 if [ -n "$netroot" ] ; then
  37     for n in $(getargs netroot=); do
  38         [ "$n" = "$netroot" ] && break
  39     done
  40     if [ "$n" = "$netroot" ]; then
  41         warn "Ignoring netroot argument for NFS"
  42         netroot=$root
  43     fi
  44 else
  45     netroot=$root;
  46 fi
  47
  48 # LEGACY: nfsroot= is valid only if root=/dev/nfs
  49 if [ -n "$nfsroot" ] ; then
  50     # @deprecated
  51     warn "Argument nfsroot is deprecated and might be removed in a future release. See 'man dracut.kernel' for more information."
  52     if [ "$(getarg root=)" != "/dev/nfs"  ]; then
  53         die "Argument nfsroot only accepted for legacy root=/dev/nfs"
  54     fi
  55     netroot=nfs:$nfsroot;
  56 fi
  57
  58 case "$netroot" in
  59     /dev/nfs) netroot=nfs;;
  60     /dev/*)
  61         if [ -n "$oldnetroot" ]; then
  62             netroot="$oldnetroot"
  63         else
  64             unset netroot
  65         fi
  66         return
  67         ;;
  68     # LEGACY: root=<server-ip>:/<path
  69     [0-9]*:/*|[0-9]*\.[0-9]*\.[0-9]*[!:]|/*)
  70         netroot=nfs:$netroot;;
  71 esac
  72
  73 # Continue if nfs
  74 case "${netroot%%:*}" in
  75     nfs|nfs4|/dev/nfs);;
  76     *)
  77         if [ -n "$oldnetroot" ]; then
  78             netroot="$oldnetroot"
  79         else
  80             unset netroot
  81         fi
  82         return
  83         ;;
  84 esac
  85
  86 # Check required arguments
  87
  88 if nfsdomain=$(getarg rd.nfs.domain -d rd_NFS_DOMAIN); then
  89     if [ -f /etc/idmapd.conf ]; then
  90         sed -i -e \
  91             "s/^[[:space:]#]*Domain[[:space:]]*=.*/Domain = $nfsdomain/g" \
  92             /etc/idmapd.conf
  93     fi
  94     # and even again after the sed, in case it was not yet specified
  95     echo "Domain = $nfsdomain" >> /etc/idmapd.conf
  96 fi
  97
  98 nfsroot_to_var $netroot
  99 [ "$path" = "error" ] && die "Argument nfsroot must contain a valid path!"
 100
 101 # Set fstype, might help somewhere
 102 fstype=${nfs#/dev/}
 103
 104 # Rewrite root so we don't have to parse this uglyness later on again
 105 netroot="$fstype:$server:$path:$options"
 106
 107 # If we don't have a server, we need dhcp
 108 if [ -z "$server" ] ; then
 109     DHCPORSERVER="1"
 110 fi;
 111
 112 # Done, all good!
 113 rootok=1
 114
 115 # Shut up init error check or make sure that block parser wont get
 116 # confused by having /dev/nfs[4]
 117 root="$fstype"
 118
 119 echo '[ -e $NEWROOT/proc ]' > $hookdir/initqueue/finished/nfsroot.sh