alpine-zdt-images/scripts/setup-ami.d/assemble-interfaces

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#!/bin/sh
# vim: set ts=4 et:
set -e
IFACE_CFG=/etc/network/interfaces
IFACE_DIR="${IFACE_CFG}.d"
cd "$IFACE_DIR"
cat > "$IFACE_CFG.new" <<EOT
# NOTE: /etc/network/assemble-interfaces rewrites this file. Edit files in
# /etc/network/interfaces.d/ to persist any customizations.
EOT
# loopback first
cat lo >> "$IFACE_CFG.new"
# existing eths
for i in /sys/class/net/eth*; do
IFACE="$(basename "$i")"
[ ! -f "$IFACE" ] && sed -e "s/%%/$IFACE/g" DEFAULT > "$IFACE"
cat "$IFACE" >> "$IFACE_CFG.new"
done
# all the rest
for i in "$IFACE_DIR"/*; do
IFACE="$(basename "$i")"
case $IFACE in
DEFAULT|lo|eth*)
continue
;;
*)
cat "$IFACE" >> "$IFACE_CFG.new"
;;
esac
done
# install new interfaces config
cp -a "$IFACE_CFG" "$IFACE_CFG.bak"
mv "$IFACE_CFG.new" "$IFACE_CFG"