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Server: Linux ip-172-31-46-210 5.15.0-1033-aws #37~20.04.1-Ubuntu SMP Fri Mar 17 11:39:30 UTC 2023 x86_64
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Dir : ~/usr/share/initramfs-tools/scripts/init-bottom/

Edit File: cloud-initramfs-dyn-netconf

#!/bin/sh
set -e

PREREQS=""
case $1 in
	prereqs) echo "${PREREQS}"; exit 0;;
esac

. /scripts/functions

PATH=/usr/sbin:/usr/bin:/sbin:/bin

# doc in klibc-utils /usr/share/doc/libklibc/README.ipconfig.gz
# example below:
#DEVICE='eth0'
#PROTO='dhcp'                    ## none, off, static. not present in precise
#IPV4ADDR='192.168.122.89'
#IPV4BROADCAST='192.168.122.255'
#IPV4NETMASK='255.255.255.0'
#IPV4GATEWAY='192.168.122.1'
#IPV4DNS0='192.168.122.1'        ## only come from dhcp
#IPV4DNS1='0.0.0.0'
#HOSTNAME=''
#DNSDOMAIN=''
#NISDOMAIN=''
#ROOTSERVER='192.168.122.1'
#ROOTPATH=''
#filename=''
#UPTIME='21'
#DHCPLEASETIME='3600'
#DOMAINSEARCH=''

# superseded by isc-dhcp and such writing the file and supporting IPv6:
#DEVICE=eno1
#HOSTNAME=
#DNSDOMAIN=
#reason='PREINIT'
#interface='eno1'
#DEVICE=eno1
#HOSTNAME=
#DNSDOMAIN=
#reason='FAIL'
#interface='eno1'
#DEVICE=eno1
#HOSTNAME=
#DNSDOMAIN=
#reason='PREINIT6'
#interface='eno1'
#DEVICE=eno1
#IPV6PROTO=dhcp6
#IPV6ADDR=2001:67c:1562:8010:1::4324
#IPV6NETMASK=64
#IPV6DNS0=2001:67c:1562:8010::2:1
#IPV6DOMAINSEARCH=
#HOSTNAME=
#DNSDOMAIN=
#reason='BOUND6'
#interface='eno1'
#new_ip6_address='2001:67c:1562:8010:1::4324'
#new_ip6_prefixlen='64'
#new_dhcp6_name_servers='2001:67c:1562:8010::2:1'

error() { echo "${0##*/}:" "$@" 1>&2; }
configure_net_if_needed() {
	# we want to call configure_networking if and only if ip= was seen
	# on the command line (LP: #1463846)
	local ip="$1"
	# empty 'ip' or ip=none or ip=off specifically mean do not bring up
	if [ -z "$ip" ]; then
		return 0
	fi
	case "$ip" in
		none|off) return 0;;
	esac
	# configure_networking does not set any flags indicating it tried
	# to run and failed, so we can only look for indication
	# that ipconfig ran, which creates files in /run/net-<device>.conf
	#
	# configure_networking does a check like this.  however, its check is
	# broken in the event that BOOTIF is not found on the command line.
	for f in /run/net-*.conf /tmp/net-*.conf; do
		if [ -f "$f" ]; then
			return 0
		fi
	done

configure_networking
}

ni_header() {
	echo "## This file is generated by cloud-initramfs-dyn-netconf"
	echo "auto lo"
	echo "iface lo inet loopback"
}

configure_net_if_needed "$IP" ||
   echo "WARN: ${0##*/}: configure_networking failed" 1>&2

tmpf="/tmp/${0##*/}.ni"

ni_header > "$tmpf"
seen=","
for f in /run/net-*.conf /tmp/net-*.conf /run/net6-*.conf; do
	[ -f "$f" ] || continue
	dev=${f#*/net-}; dev=${dev%.conf};
	# perhaps we saw this device from /run and now we're in /tmp
	[ "${seen#*,${dev},}" = "${seen}" ] || continue

seen="${seen}${dev},"

DEVICE=""; PROTO=""; IPV4ADDR=""; IPV4NETMASK=""; IPV4GATEWAY="";
	IPV4DNS0=""; IPV4DNS1=""; DNSDOMAIN=""; DOMAINSEARCH=""; filename="";
	DEVICE6=""; IPV4PROTO=""; IPV6PROTO=""; IPV6ADDR=""; IPV6NETMASK="";
	IPV6GATEWAY=""; IPV6DNS0=""; IPV6DNS1=""; IPV6DOMAINSEARCH="";
	. "$f"

if [ -z "$DEVICE" ]; then
		if [ -z "$DEVICE6" ]; then
		    error "WARNING: $f had no 'DEVICE' or 'DEVICE6' set"
		    continue
		else
		    DEVICE="$DEVICE6"
		fi
	fi
	# If IPv6 is supported, we get both of these, and at least one of them
	# is set.  If we get both, use IPv4.
	# Prior to that, PROTO was used, so we know it's IPv4 we want.
	if [ -z "$IPV4PROTO" -a -z "$IPV6PROTO" ]; then
		IPV4PROTO="$PROTO"
	fi
	# ipconfig on precise does not write PROTO.
	if [ -z "$IPV4PROTO" -a -z "$IPV6PROTO" ]; then
		if [ -n "$filename" ]; then
			IPV4PROTO="dhcp"
		else
			IPV4PROTO="static"
		fi
	fi

# We need to use care, since the script is running set -e.
	echo "manual $DEVICE"
	if [ "$IPV4PROTO" = "dhcp" ]; then
		echo "iface $DEVICE inet dhcp"
	elif [ "$IPV4PROTO" = "static" ]; then
		echo "iface $DEVICE inet static"
		if [ -n "$IPV4ADDR" ]; then
			printf "\t%s\n" "address $IPV4ADDR"
		else
			error "WARNING: $f static with no address"
		fi
		if [ -n "$IPV4NETMASK" ]; then
			printf "\t%s\n" "netmask $IPV4NETMASK"
		else
			error "WARNING: $f static with no netmask"
		fi
		if [ -n "$IPV4GATEWAY" ]; then
			printf "\t%s\n" "gateway $IPV4GATEWAY"
		fi
	elif [ "$IPV6PROTO" = "dhcp6" ]; then
		echo "iface $DEVICE inet6 dhcp"
	elif [ "$IPV6PROTO" = "static" ]; then
		echo "iface $DEVICE inet6 static"
		if [ -n "$IPV6ADDR" ]; then
			printf "\t%s\n" "address $IPV6ADDR"
		else
			error "WARNING: $f static with no address"
		fi
		if [ -n "$IPV6NETMASK" ]; then
			printf "\t%s\n" "netmask $IPV6NETMASK"
		else
			error "WARNING: $f static with no netmask"
		fi
		if [ -n "$IPV6GATEWAY" ]; then
			printf "\t%s\n" "gateway $IPV6GATEWAY"
		fi
	fi

nsline=""
	if [ -n "$IPV4DNS0" -a "$IPV4DNS0" != "0.0.0.0" ]; then
		nsline="${IPV4DNS0}"
		if [ -n "$IPV4DNS1" -a "$IPV4DNS1" = "0.0.0.0" ]; then
			nsline="${nsline} ${IPV4DNS1}"
		fi
	elif [ -n "$IPV6DNS0" ]; then
		nsline="${nsline} ${IPV6DNS0}"
		[ -z "$IPV6DNS1" ] || nsline="${nsline} ${IPV6DNS1}"
	fi
	[ -z "$nsline" ] || printf "\tdns-nameservers %s\n" "$nsline"
	if [ -n "${DNSDOMAIN}${DOMAINSEARCH}${IPV6DOMAINSEARCH}" ]; then
		SEARCH=" ${DNSDOMAIN} ${DOMAINSEARCH} ${IPV6DOMAINSEARCH}"
		printf "\tdns-search %s\n" "${SEARCH}"
	fi
done >> "$tmpf"

[ -d /run/network ] || mkdir /run/network
mv "$tmpf" /run/network/dynamic-interfaces

# vi: ts=4 noexpandtab