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#!/bin/sh -e
# suppress configuration of network interface used
# by iSCSI root device
#
# If the root filesystem is on iSCSI, then we must take care to avoid
# changing the state of its network interface. To this end, the initramfs
# leaves a note for us which interface was used, and we mangle
# /run/network/ifstate manually to stop it being brought up or down
# automatically. This is a slight layering violation, but, unfortunately,
# ifupdown appears to have no way to do this without also running
# /etc/network/*.d/ scripts.
assert_interface() {
# udev sets INTERFACE to the name of the currently-processed nic.
[ -n "$INTERFACE" ] && return 0
echo "environment variable INTERFACE not set." 1>&2;
return 1
}
start() {
CR="
"
assert_interface || return
ifile=/run/initramfs/open-iscsi.interface
[ -f "$ifile" ] && read iface < "$ifile" || return 0
[ "$INTERFACE" = "$iface" ] || return
if ! grep -qs "^$iface=" /run/network/ifstate; then
mkdir -p /run/network
echo "$iface=$iface" >>/run/network/ifstate
if [ -f /run/net-$iface.conf ]; then
conf=/run/net-$iface.conf
elif [ -f /run/net6-$iface.conf ]; then
conf=/run/net6-$iface.conf
else
conf=""
fi
if command -v resolvconf >/dev/null &&
[ -n "$conf" ]; then
. "$conf"
R=""
[ -n "$DOMAINSEARCH" ] && R="$R${CR}search $DOMAINSEARCH"
[ -n "$IPV6DOMAINSEARCH" ] && R="$R${CR}search $IPV6DOMAINSEARCH"
for ns in "$IPV4DNS0" "$IPV4DNS1" "$IPV6DNS0" "$IPV6DNS1"; do
[ -n "$ns" -a "$ns" != "0.0.0.0" ] && R="$R${CR}nameserver $ns"
done
if [ -n "$R" ]; then
# create the dir in case resolvconf did not start yet
mkdir -p /run/resolvconf/interface
resolvconf -a $iface.iscsi-network <<EOF
${R#${CR}}
EOF
fi
fi
fi
}
stop() {
assert_interface || return
ifile=/run/initramfs/open-iscsi.interface
[ -f "$ifile" ] && read iface < "$ifile" || return 0
[ "$INTERFACE" = "$iface" ] || return
if grep -qs "^$iface=" /run/network/ifstate; then
grep -v "^$iface=" /run/network/ifstate >/run/network/.ifstate.tmp || true
mv /run/network/.ifstate.tmp /run/network/ifstate
if command -v resolvconf >/dev/null; then
resolvconf -d $iface.iscsi-network
fi
fi
}
case "$1" in
start) start ;;
stop) stop ;;
*) echo "ERROR: must be called with 'start' or 'stop'" >&2; exit 1 ;;
esac
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