modules.d/40network/netroot

   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 PATH=/usr/sbin:/usr/bin:/sbin:/bin
   6 type getarg >/dev/null 2>&1 || . /lib/dracut-lib.sh
   7
   8 # Huh? Empty $1?
   9 [ -z "$1" ] && exit 1
  10
  11 # Huh? No interface config?
  12 [ ! -e /tmp/net.$1.up ] && exit 1
  13
  14 # [ ! -z $2 ] means this is for manually bringing up network
  15 # instead of real netroot; If It's called without $2, then there's
  16 # no sense in doing something if no (net)root info is available
  17 # or root is already there
  18 [ -e /tmp/root.info ] || exit 1
  19 . /tmp/root.info
  20 if [ -z "$2" ]; then
  21     [ -d $NEWROOT/proc ] && exit 0
  22     [ -z "$netroot" ] && exit 1
  23 fi
  24
  25 # Let's see if we have to wait for other interfaces
  26 # Note: exit works just fine, since the last interface to be
  27 #       online'd should see all files
  28 [ -e "/tmp/net.ifaces" ] && read IFACES < /tmp/net.ifaces
  29 for iface in $IFACES ; do
  30     [ -e /tmp/net.$iface.up ] || exit 1
  31 done
  32
  33 # Set or override primary interface
  34 netif=$1
  35 [ -e "/tmp/net.bootdev" ] && read netif < /tmp/net.bootdev
  36
  37 if [ -e /tmp/net.$netif.manualup ]; then
  38     rm -f /tmp/net.$netif.manualup
  39 fi
  40
  41 # Figure out the handler for root=dhcp by recalling all netroot cmdline
  42 # handlers when this is not called from manually network bringing up.
  43 if [ -z "$2" ]; then
  44     if [ "$netroot" = "dhcp" ] || [ "$netroot" = "dhcp6" ] ; then
  45         # Unset root so we can check later
  46         unset root
  47
  48         # Load dhcp options
  49         [ -e /tmp/dhclient.$netif.dhcpopts ] && . /tmp/dhclient.$netif.dhcpopts
  50
  51         # If we have a specific bootdev with no dhcpoptions or empty root-path,
  52         # we die. Otherwise we just warn
  53         if [ -z "$new_root_path" ] ; then
  54             [ -n "$BOOTDEV" ] && die "No dhcp root-path received for '$BOOTDEV'"
  55             warn "No dhcp root-path received for '$BOOTDEV' trying other interfaces if available"
  56             exit 1
  57         fi
  58
  59         # Set netroot to new_root_path, so cmdline parsers don't call
  60         netroot=$new_root_path
  61
  62         # FIXME!
  63         for f in $hookdir/cmdline/90*.sh; do
  64             [ -f "$f" ] && . "$f";
  65         done
  66     else
  67         rootok="1"
  68     fi
  69
  70     # Check: do we really know how to handle (net)root?
  71     [ -z "$root" ] && die "No or empty root= argument"
  72     [ -z "$rootok" ] && die "Don't know how to handle 'root=$root'"
  73
  74     handler=${netroot%%:*}
  75     handler=${handler%%4}
  76     handler=$(command -v ${handler}root)
  77     if [ -z "$netroot" ] || [ ! -e "$handler" ] ; then
  78         die "No handler for netroot type '$netroot'"
  79     fi
  80 fi
  81
  82 # We're here, so we can assume that upping interfaces is now ok
  83 [ -z "$IFACES" ] && IFACES="$netif"
  84 for iface in $IFACES ; do
  85     . /tmp/net.$iface.up
  86 done
  87
  88 [ -e /tmp/net.$netif.gw ]          && . /tmp/net.$netif.gw
  89 [ -e /tmp/net.$netif.hostname ]    && . /tmp/net.$netif.hostname
  90 [ -e /tmp/net.$netif.resolv.conf ] && cp -f /tmp/net.$netif.resolv.conf /etc/resolv.conf
  91
  92 # Load interface options
  93 [ -e /tmp/net.$netif.override ] && . /tmp/net.$netif.override
  94 [ -e /tmp/dhclient.$netif.dhcpopts ] && . /tmp/dhclient.$netif.dhcpopts
  95
  96 # Handle STP Timeout: arping the default router if root server is
  97 # unknown or not local, or if not available the root server.
  98 # Note: This assumes that if no router is present the
  99 # root server is on the same subnet.
 100 #
 101 # TODO There's some netroot variants that don't (yet) have their
 102 # server-ip netroot
 103
 104 # Get router IP if set
 105 [ -n "$new_routers" ] && gw_ip=${new_routers%%,*}
 106 [ -n "$gw" ] && gw_ip=$gw
 107 # Get root server IP if set
 108 if [ -n "$netroot" ]; then
 109     dummy=${netroot#*:}
 110     dummy=${dummy%%:*}
 111     case "$dummy" in
 112         [0-9]*\.[0-9]*\.[0-9]*\.[0-9]*) netroot_ip=$dummy;;
 113     esac
 114 fi
 115 # Default arping dest to router
 116 dest="$gw_ip"
 117 # Change to arping root server if appropriate
 118 if [ -n "$netroot_ip" ]; then
 119     if [ -z "$dest" ]; then
 120          # no gateway so check root server
 121         dest="$netroot_ip"
 122     else
 123         r=$(ip route get "$netroot_ip")
 124         if ! strstr "$r" ' via ' ; then
 125             # local root server, so don't arping gateway
 126             dest="$netroot_ip"
 127         fi
 128     fi
 129 fi
 130 if [ -n "$dest" ] && ! arping -q -f -w 60 -I $netif $dest ; then
 131     dinfo "Resolving $dest via ARP on $netif failed"
 132 fi
 133
 134 # exit in case manually bring up network
 135 [ -n "$2" ] && exit 0
 136
 137 # Source netroot hooks before we start the handler
 138 source_all $hookdir/netroot
 139
 140 # Run the handler; don't store the root, it may change from device to device
 141 # XXX other variables to export?
 142 if $handler $netif $netroot $NEWROOT; then
 143     # Network rootfs mount successful
 144     for iface in $IFACES ; do
 145         [ -f /tmp/dhclient.$iface.lease ] &&    cp /tmp/dhclient.$iface.lease    /tmp/net.$iface.lease
 146         [ -f /tmp/dhclient.$iface.dhcpopts ] && cp /tmp/dhclient.$iface.dhcpopts /tmp/net.$iface.dhcpopts
 147     done
 148
 149     # Save used netif for later use
 150     [ ! -f /tmp/net.ifaces ] && echo $netif > /tmp/net.ifaces
 151 else
 152     warn "Mounting root via '$netif' failed"
 153     # If we're trying with multiple interfaces, put that one down.
 154     # ip down/flush ensures that routeing info goes away as well
 155     if [ -z "$BOOTDEV" ] ; then
 156         ip link set $netif down
 157         ip addr flush dev $netif
 158         echo "#empty" > /etc/resolv.conf
 159     fi
 160 fi
 161 exit 0