Debian Setup Script

• cat /usr/local/sbin/debian-setup.sh

#!/bin/bash

# Standardwerte setzen
FQDN=""
ADDR=""
GW=""
NS=""
USE_DHCP=0

# Optionen mit getopts parsen
while getopts "f:a:g:n:d" opt; do
  case $opt in
    f) FQDN="$OPTARG" ;;
    a) ADDR="$OPTARG" ;;
    g) GW="$OPTARG" ;;
    n) NS="$OPTARG" ;;
    d) USE_DHCP=1 ;;
    *) echo "Ungültige Option" >&2; exit 1 ;;
  esac
done


# Gültigkeit prüfen
if [[ -z "$FQDN" ]]; then
  echo "Fehlender FQDN! Nutzung:"
  echo "$0 -f <FQDN> [-d | -a <IP/CIDR> -g <Gateway> -n <Nameserver>]"
  exit 1
fi

if (( USE_DHCP == 1 )); then
  if [[ -n "$ADDR" || -n "$GW" || -n "$NS" ]]; then
    echo "Fehler: -d darf nicht mit -a, -g oder -n kombiniert werden." >&2
    exit 1
  fi
else
  if [[ -z "$ADDR" || -z "$GW" || -z "$NS" ]]; then
    echo "Fehlende Argumente für statische Konfiguration! Nutzung:"
    echo "$0 -f <FQDN> [-d | -a <IP/CIDR> -g <Gateway> -n <Nameserver>]"
    exit 1
  fi
fi

# SHORT und DOM aus FQDN berechnen
SHORT=$(echo "$FQDN" | cut -d'.' -f1)
DOM=$(echo "$FQDN" | cut -d'.' -f2-)

# /etc/network/interfaces schreiben
cat <<HERE > /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*

auto lo
iface lo inet loopback

auto enp0s3
HERE

if (( USE_DHCP == 1 ))
then
  echo "iface enp0s3 inet dhcp" >> /etc/network/interfaces
else
  cat <<HERE >> /etc/network/interfaces
iface enp0s3 inet static
 address $ADDR
 gateway $GW
 dns-nameservers $NS
 dns-search $DOM
HERE
fi

# Hostname setzen
hostnamectl set-hostname "$FQDN"