create-setup.sh

#! /bin/bash

die() {
    echo "$*" >&2
    exit 1
}


if (($# != 1)); then
    echo "usage: $0 switchname" >&2
    exit 1
fi

name="$1"
r="$(getent hosts "$name")" || die "$name: no ip address"
address=$(echo "$r"|awk '{print $1}')
fullname=$(echo "$r"|awk '{print $2}')
shortname=${fullname%.molgen.mpg.de}
now=$(date -u +%m%d%H%M%Y )

credentials="$(cat .credentials)" || exit 1

case "$name" in
    delta-tn48m-poe-* | ec-as4224-52p-* )
	ports=52
        ;;
    delta-tn4810m-* | ec-as5114-48x-*)
	ports=48
        ;;
    *)
        die "$name: unknown switch type"
        ;;
esac

cat <<__EOF__
date -u $now
ln -sf /usr/share/zoneinfo/Europe/Berlin /etc/localtime
echo "$fullname" > /etc/hostname
cat > /etc/network/interfaces<<EOF
auto lo
iface lo inet loopback

auto ma1
iface ma1 inet static
    address $address
    netmask 255.255.0.0
    gateway 172.20.0.1
    dns-nameservers 141.14.16.1
EOF
ifup ma1
echo '$credentials' | chpasswd -e
echo "server time.molgen.mpg.de" >> /etc/ntp.conf
mkdir .ssh
echo "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAICt7f+MZnko5X/g8kWskjcRBDxv1wSElcJYJ59TPV/o4 switchdev@wtf.molgen.mpg.de" > .ssh/authorized_keys
sed -i 's/^pool/#pool/' /etc/ntp.conf
mkdir /var/molgen
cat > /var/molgen/setup.sh <<'EOF'
#! /bin/bash
ip link add br0 type bridge vlan_filtering 1
for i in \$(seq 1 $ports); do ip link set swp\$i master br0 up;done
brctl stp br0 on
test -e /var/molgen/vlan.sh && /var/molgen/vlan.sh
ip link set dev br0 up
EOF
chmod +x /var/molgen/setup.sh
cat > /etc/systemd/system/molgen.service <<'EOF'
[Unit]
After=network.target

[Service]
Type=oneshot
ExecStart=/var/molgen/setup.sh
RemainAfterExit=yes

[Install]
WantedBy=multi-user.target
EOF
systemctl enable molgen
reboot
__EOF__