Add static/dhcp ip helpers for NetworkManager

files/helpers/set_dhcp_ip.sh

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+#!/bin/bash
+
+# This script will reset the IP Address back to default of DHCP
+# helpful for a pending restore
+
+/bin/nmcli c m "System eth0" ipv4.method auto
+/bin/nmcli c m "System eth0" ipv4.address "" ipv4.gateway ""
+/bin/nmcli connection up "System eth0"

files/helpers/set_static_ip.sh

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+#!/bin/bash
+
+# get subnet
+subnet=$(ip a | grep "inet " | tail -1 | awk '{print $2}')
+
+# get router/gateway
+router=$(ip route show | head -1 | awk '{print $3}')
+
+# get size of network portion of address in bytes
+sz=$(echo $subnet | awk -F / '{print $2}')
+bytes=$(("$sz" / 8))
+prefix=$(echo "$subnet" | cut -d. -f1-$bytes)      # e.g., 192.168.0
+
+# get IP address to be set
+IP=$(hostname -I | awk '{print $1}')             # current IP
+echo -n "Keep IP address?—$IP [yn]> "
+read -r ans
+if [ "$ans" == "n" ]; then
+  echo -n "Enter new IP address: "
+  read -r IP
+  # check if specified IP is properly formatted
+  if [[ ! $IP =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
+    echo Invalid IP
+  fi
+  # check if specified IP works for local network
+  if [[ ! $IP =~ ^$prefix ]]; then
+    echo "ERROR: Specified IP not usable for local network"
+    exit
+  fi
+fi
+
+# check if specified IP is properly formatted
+if [[ ! $IP =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
+  echo Invalid IP
+fi
+
+# fetch the UUID
+UUID=$(nmcli connection show | tail -1 | awk '{print $4}')
+if [[ "$UUID" == "ethernet" ]]; then
+ # This is the other format of nmcli connection show
+ UUID=$(nmcli connection show | head -2 | tail -1 | awk '{print $3}')
+fi
+
+# run commands to set up the permanent IP address
+nmcli connection modify "$UUID" IPv4.address "$IP"/"$sz"
+nmcli connection modify "$UUID" IPv4.gateway "$router"
+nmcli connection modify "$UUID" IPv4.method manual
+nmcli connection up "$UUID"