Check that given DOMAIN(s) are present in /etc/hosts and resolve to localhost

domain-checker

#!/bin/bash

# See: https://gist.github.com/odolbeau/d961aad7dc026cb2e851e59cdcd3eec6

if [ $# -eq 0 ] || [ -z "$1" ]; then
    echo -e "Usage: $0 DOMAIN..."
    echo -e "Check that given DOMAIN(s) are present in /etc/hosts and resolve to localhost"
    exit 1
fi

# If the /etc/hosts file does not exists, we don't have any suggestion to do.
if [ ! -f /etc/hosts ]; then
    echo -e "\033[31mERROR:\033[0m File \033[33m/etc/hosts\033[0m not found."
    exit 1
fi

DOMAINS=$*
NOT_CONFIGURED_DOMAINS=
for DOMAIN in $DOMAINS; do
    if ! grep "127.0.0.1 .*${DOMAIN}.*" /etc/hosts >/dev/null 2>&1; then
        NOT_CONFIGURED_DOMAINS+="$DOMAIN "
        echo -e "\033[31mERROR:\033[0m Domain \033[33m$DOMAIN\033[0m is not configured."
    fi
done

# Trim leading space
NOT_CONFIGURED_DOMAINS=`echo $NOT_CONFIGURED_DOMAINS | sed 's/ *$//'`

# If all domains are configured, our job is done!
if [ -z "$NOT_CONFIGURED_DOMAINS" ]; then
    echo -e "\033[32mAll domains seem correctly configured.\033[0m"

    exit 0
fi

COMMAND="echo \"127.0.0.1 ${NOT_CONFIGURED_DOMAINS}\" | sudo tee -a /etc/hosts"

echo
echo -e "\033[33mYou could update your /etc/hosts file to fix the problem:\033[0m"
echo -e "${COMMAND}\033[0m"
echo

exit 1

Usage in a custom bash script :

if ! curl -s https://gist.githubusercontent.com/odolbeau/d961aad7dc026cb2e851e59cdcd3eec6/raw/5b5070b3ff11c956d0d459e73f7fca21e6d65a6f/domain-checker | bash -s -- mydomain.local; then
    echo -e "Please configure domain on your laptop."
    exit 1
fi