#ensure apache log directory and error.log exists
mkdir -p /var/log/apache2/
touch /var/log/apache2/error.log

#create data directory promtail to store information about which logs have already been processed(notified)
mkdir -p /data/loki/

#updates repositories, to ensure we are up to date
sudo apt-get update -y

#install unzip to unzip to extract archive that constain the promtail release
sudo apt-get install unzip -y

#gets newest release for promtail on x64 architecture - check https://github.com/grafana/loki/releases for available architectures and platforms
sudo curl -s https://api.github.com/repos/grafana/loki/releases/latest | grep browser_download_url |  cut -d '"' -f 4 | grep promtail-linux-amd64.zip | wget -i -

#extracts the downloaded archive
sudo unzip promtail-linux-amd64.zip

#move the extracted binary to be on path
sudo mv promtail-linux-amd64 /usr/local/bin/promtail

#create configuration directory
mkdir -p /etc/promtail/

#write configuration file
echo "server:
  disable: true

positions:
  filename: /data/loki/positions.yaml

clients:
- url: https://lognotifier.com/api/users/[INSERT_YOUR_ID_HERE]/log/

scrape_configs:
- job_name: system
  static_configs:
  - targets:
    - localhost
    labels:
      job: varlogs
      __path__: /var/log/apache2/error.log" > /etc/promtail/promtail-local-config.yaml

#Create promtail service. Alternatively simply run /usr/local/bin/promtail -config.file /etc/promtail/promtail-local-config.yaml
echo "[Unit]
Description=Promtail service
After=network.target

[Service]
Type=simple
User=root
ExecStart=/usr/local/bin/promtail -config.file /etc/promtail/promtail-local-config.yaml

[Install]
WantedBy=multi-user.target" > /etc/systemd/system/promtail.service

#reloads daemon configurations
sudo systemctl daemon-reload

#enables service on startup
sudo systemctl enable promtail.service

#starts service
sudo systemctl start promtail.service