#!/usr/bin/env bash

set -x


DOWNLOAD_URL="https://github.com/prometheus/prometheus/releases/download/v2.52.0/prometheus-2.52.0.linux-amd64.tar.gz"
groupadd --system prometheus

useradd -s /sbin/nologin --system -g prometheus prometheus

mkdir /var/lib/prometheus

for i in rules rules.d files_sd
do 
	mkdir -p /etc/prometheus/${i}
done


mkdir -p /tmp/prometheus

cd /tmp/prometheus
#curl -s https://api.github.com/repos/prometheus/prometheus/releases/latest | grep browser_download_url | grep linux-amd64 | cut -d '"' -f 4 | wget -qi -
wget "${DOWNLOAD_URL}" -O "prometheus.tar.gz"

tar xvf prometheus.tar.gz

cd prometheus*/

mv prometheus promtool /usr/local/bin/

prometheus --version

mv prometheus.yml /etc/prometheus/prometheus.yml

mv consoles/ console_libraries/ /etc/prometheus/

cd ${HOME}

cat >/etc/systemd/system/prometheus.service <<EOF
[Unit]
Description=Prometheus
Documentation=https://prometheus.io/docs/introduction/overview/
Wants=network-online.target
After=network-online.target

[Service]
Type=simple
User=prometheus
Group=prometheus
ExecReload=/bin/kill -HUP \$MAINPID
ExecStart=/usr/local/bin/prometheus \
  --config.file=/etc/prometheus/prometheus.yml \
  --storage.tsdb.path=/var/lib/prometheus \
  --web.console.templates=/etc/prometheus/consoles \
  --web.console.libraries=/etc/prometheus/console_libraries \
  --web.listen-address=0.0.0.0:9090 \
  --web.external-url=

SyslogIdentifier=prometheus
Restart=always

[Install]
WantedBy=multi-user.target
EOF

for i in rules rules.d files_sd
do 
	chown -R prometheus:prometheus /etc/prometheus/${i}
done

for i in rules rules.d files_sd
do 
	chmod -R 775 /etc/prometheus/${i}
done

chown -R prometheus:prometheus /var/lib/prometheus/

systemctl daemon-reload

systemctl start prometheus

systemctl enable prometheus

systemctl status prometheus --no-pager


set +x