#!/bin/bash
# ============LICENSE_START=======================================================
#  Copyright (C) 2020 The Nordix Foundation. All rights reserved.
# ================================================================================
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# SPDX-License-Identifier: Apache-2.0
# ============LICENSE_END=========================================================

set -o nounset
set -o pipefail

# ensure apt is not running before proceeding with the rest
echo "Info  : Wait for completion of an existing apt process before proceeding..."
while true; do
  pkg_mgr_process=$(pgrep -f apt | cat)
  if [[ -n $pkg_mgr_process ]]; then
    sleep 10
  else
    break
  fi
done
echo "Info  : apt process done. Continuing..."

# list of basic packages to install
PKG_LIST=(
    apt-utils
    apt-transport-https
    ca-certificates
    gnupg-agent
    software-properties-common
    git
    vim
    curl
    wget
    chrony
    openjdk-11-jre-headless
    jq
)

# we need apt to proceed without any prompt asking for user input
export DEBIAN_FRONTEND=noninteractive

echo "Info  : Install packages"
# update packages to their latest
sudo -H -E apt update
sudo -H -E apt upgrade -y -q=3

# install packages
sudo -H -E apt -y -q=3 install ${PKG_LIST[@]}

# If you have a issue with Let's Encrypt certificate when cloning repo due to DST Root CA X3 Expiration:
# https://letsencrypt.org/docs/dst-root-ca-x3-expiration-september-2021/
# remove outdated certificate from system
sudo rm -rf /usr/share/ca-certificates/mozilla/DST_Root_CA_X3.crt
# update ca-certificates
sudo update-ca-certificates --fresh --verbose

# remove unnecessary packages
sudo -H -E apt autoremove -y

echo "Info  : Enable time sync"
# ensure time sync is setup
sudo systemctl enable chrony --now
sudo chronyc -a 'burst 4/4' && sudo chronyc -a makestep

echo "Info  : Enable nested virtualization"
# enable nested virtualization
sudo bash -c 'cat << EOF > /etc/modprobe.d/qemu-system-x86.conf
options kvm-intel nested=y enable_apicv=n
EOF'
sudo modprobe -r kvm_intel kvm
sudo modprobe -a kvm_intel kvm
sudo lsmod | grep kvm_intel
sudo cat /sys/module/kvm_intel/parameters/nested

echo "Info  : Create and configure jenkins user"
# create and configure jenkins user
sudo useradd -G sudo -d /home/jenkins -m -c "jenkins user" -s /bin/bash jenkins
sudo mkdir -p /home/jenkins/nordix/slave_root
sudo chown -R jenkins:jenkins /home/jenkins/nordix/slave_root
sudo chmod -R 755 /home/jenkins/nordix/slave_root

# modify sudoers - disable env_reset, !requiretty and passwordless sudo
sudo sed -i "s/^Defaults.*env_reset/#&\nDefaults:jenkins  \!requiretty/" /etc/sudoers
sudo sed -i "s/^%sudo.*ALL/%sudo   ALL=(ALL:ALL)   NOPASSWD: ALL/" /etc/sudoers

# disable ssh password login, enable ssh with keys for jenkins user
sudo bash -c "echo PasswordAuthentication no >> /etc/ssh/sshd_config"
sudo bash -c "echo PubkeyAuthentication yes >> /etc/ssh/sshd_config"
sudo bash -c "echo AllowUsers jenkins >> /etc/ssh/sshd_config"
sudo systemctl restart sshd

echo "Info  : Create cloud-init script"
# get cloud-init script in place so we can place the keys into ~jenkins/.ssh
sudo bash -c 'cat << EOF > /var/lib/cloud/scripts/per-instance/copykeystojenkins.sh
#!/bin/bash
sudo mkdir -p /home/jenkins/.ssh
# append ssh key injected by openstack to authorized_keys
sudo cat /home/ubuntu/.ssh/authorized_keys >> /home/jenkins/.ssh/authorized_keys
# append user ssh public keys uploaded by packer to authorized_keys
sudo cat /home/ubuntu/authorized_keys.packer >> /home/jenkins/.ssh/authorized_keys
# remove /home/ubuntu/authorized_keys.packer
sudo rm -f /home/jenkins/authorized_keys.packer
sudo chown -R jenkins:jenkins /home/jenkins/.ssh
sudo chmod -R go-rwx /home/jenkins/.ssh
sudo userdel -f -r ubuntu
EOF'

sudo chmod +x /var/lib/cloud/scripts/per-instance/copykeystojenkins.sh