hostname dhclient hook

#!/bin/sh
# dhclient change hostname script for Ubuntu
# /etc/dhcp/dhclient-exit-hooks.d/sethostname
# logs in /var/log/upstart/network-interface-eth0.log

set -x
export

if [ "$reason" = "BOUND" ] || [ "$reason" = "RENEW" ] || [ "$reason" = "REBIND" ] || [ "$reason" = "REBOOT" ]; then
    echo new_ip_address=$new_ip_address
    echo new_host_name=$new_host_name
    echo new_domain_name=$new_domain_name
    
    new_fqdn="$new_host_name.$new_domain_name"
    echo new_fqdn=$new_fqdn

    old_fqdn=$(hostname -f)
    echo old_fqdn=$old_fqdn
    
    if [ ! -z "$new_host_name" ] && [ "$old_fqdn" != "$new_fqdn" ]; then
        # Rename Host
        hostnamectl set-hostname $new_host_name

        # Update /etc/hosts if needed
        TMPHOSTS=/etc/hosts.dhcp.new
        if ! grep "$new_ip_address $new_fqdn $new_host_name" /etc/hosts; then
            # Remove the 127.0.1.1 put there by the debian installer
            grep -vF '127.0.1.1 ' < /etc/hosts > $TMPHOSTS
            mv $TMPHOSTS /etc/hosts
            
            # Remove old entries
            grep -vF "$new_ip_address " < /etc/hosts > $TMPHOSTS
            mv $TMPHOSTS /etc/hosts
            grep -vF " $new_host_name" < /etc/hosts > $TMPHOSTS
            mv $TMPHOSTS /etc/hosts
            if [ ! -z "$old_fqdn" ]; then
                grep -vF " $old_fqdn" < /etc/hosts > $TMPHOSTS
                mv $TMPHOSTS /etc/hosts
            end
            
            # Add the our new ip address and name
            echo "$new_ip_address $new_fqdn $new_host_name" >> /etc/hosts
        fi

        # Recreate puppet certs
        rm -rf /var/lib/puppet/ssl
        service puppet restart

        # Restart avahi daemon
        service avahi-daemon restart
    fi
fi

set +x

row 39 "end" -> "fi"