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