Add an alias for loopback interface on startup of MacOS for https://github.com/otm/limes

add_lo0_alias.sh

#!/bin/bash

# This script adds an alias for loopback interface on start of MacOS X.
# This is needed in order for https://github.com/otm/limes to work properly.
# 
# Inspired by 
# https://apple.stackexchange.com/questions/311188/running-a-sudo-command-on-startup
#
# USAGE (with local cloned version): 
#   sudo bash add_lo0_alias.sh
#
# USAGE (without cloning - ALWAYS VERIFY WHAT YOU RUN BEFORE YOU RUN IT):
#   sudo bash -c "$(curl -fsSL https://gist.githubusercontent.com/IanSavchenko/6734cb4ac8422399e60f34d7a68ccd44/raw/add_lo0_alias.sh)"
#
# Written by Ian Savchenko in 2019 (iansavchenko.com)

set -euo pipefail

DAEMON_NAME=org.limes.ifconfig
DAEMON_FILE_NAME=${DAEMON_NAME}.plist
DAEMON_FILE_PATH=/Library/LaunchDaemons/${DAEMON_FILE_NAME}

touch ${DAEMON_FILE_PATH}
chown root:wheel ${DAEMON_FILE_PATH}

cat > ${DAEMON_FILE_PATH} <<- EOM
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>Label</key>
    <string>${DAEMON_NAME}</string>
    <key>RunAtLoad</key>
    <true/>
    <key>StandardErrorPath</key>
    <string>/tmp/${DAEMON_NAME}.err</string>
    <key>StandardOutPath</key>
    <string>/tmp/${DAEMON_NAME}.out</string>
    <key>ProgramArguments</key>
    <array>
    <string>/sbin/ifconfig</string>
    <string>lo0</string>
    <string>alias</string>
    <string>169.254.169.254</string>
    </array>
</dict>
</plist>
EOM

echo Created ${DAEMON_FILE_PATH}!