adding node exporter, loki, and promtail

prometheus_node_exporter/rootfs/etc/cont-init.d/node_exporter.sh

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+#!/usr/bin/env bashio
+# ==============================================================================
+# Home Assistant Community Add-on: Prometheus Node Exporter
+# Configures Prometheus Node Exporter
+# ==============================================================================
+bashio::require.unprotected
+echo "${SUPERVISOR_TOKEN}" > '/run/home-assistant.token'
+
+# Even if the user isn't using these options, we're creating the web config file
+# This will allow us to append to the web config file as needed (based on variables)
+# Prometheus Node Exporter will run with a blank web config file in the meantime
+
+config_dir=/config
+web_config_dir=$config_dir/prometheus_node_exporter
+mkdir -p $web_config_dir
+chmod 750 $web_config_dir
+chown root:prometheus $web_config_dir
+
+web_config_file=$web_config_dir/node_exporter_web.yml
+rm -f $web_config_file
+touch $web_config_file
+chmod 740 $web_config_file
+chown root:prometheus $web_config_file
+
+# Poor man's debugger: check permissions on web config file
+#ls -la $web_config_file
+
+bashio::log.info "Add-on info - name:     $(bashio::addon.name)"
+bashio::log.info "Add-on info - version:  $(bashio::addon.version)"
+bashio::log.info "Add-on info - hostname: $(bashio::addon.hostname)"
+bashio::log.info "Add-on info - DNS name: $(bashio::addon.dns)"
+bashio::log.info "Checking configuration options..."
+
+#####################
+# HTTP Basic Auth
+#####################
+
+if bashio::config.false 'enable_basic_auth'; then
+  bashio::log.warning "HTTP Basic Auth is disabled!"
+fi
+
+if bashio::config.true 'enable_basic_auth'; then
+  bashio::log.info "HTTP Basic Auth is enabled!"
+
+  # Require variables
+  bashio::config.require 'basic_auth_user' "You enabled HTTP Basic Auth, so you must set a username"
+  bashio::config.require 'basic_auth_pass' "You enabled HTTP Basic Auth, so you must set a password"
+  basic_auth_user="$(bashio::config 'basic_auth_user')"
+  basic_auth_pass="$(bashio::config 'basic_auth_pass')"
+
+  # bcrypt the password
+  hashed_password=$(htpasswd -bnBC 12 "" "$basic_auth_pass" | tr -d ':\n')
+
+  # Start echoing lines out to web config file (YAML is space-sensitive so I'm lazily not using a heredoc)
+  echo "basic_auth_users:" >> $web_config_file
+  echo "    $basic_auth_user: $hashed_password" >> $web_config_file
+
+fi
+
+#####################
+# TLS
+#####################
+
+if bashio::config.false 'enable_tls'; then
+  bashio::log.warning "TLS is disabled!"
+fi
+
+if bashio::config.true 'enable_tls'; then
+  bashio::log.info "TLS is enabled!"
+
+  # Require variables
+  bashio::config.require 'cert_file' "You enabled TLS, so you must set certificate file"
+  bashio::config.require 'cert_key' "You enabled TLS, so you must set certificate key"
+  cert_file="$(bashio::config 'cert_file')"
+  cert_key="$(bashio::config 'cert_key')"
+
+  # Start echoing lines out to web config file (YAML is space-sensitive so I'm lazily not using a heredoc)
+  echo "tls_server_config:" >> $web_config_file
+  echo "    cert_file: $cert_file" >> $web_config_file
+  echo "    key_file: $cert_key" >> $web_config_file
+
+fi

prometheus_node_exporter/rootfs/etc/services.d/node_exporter/run

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+#!/usr/bin/env bashio
+# ==============================================================================
+# Home Assistant Community Add-on: Prometheus Node Exporter
+# Runs the Prometheus Node Exporter
+# ==============================================================================
+bashio::log.info "Starting Prometheus Node Exporter..."
+
+# Run Prometheus
+exec /usr/local/bin/node_exporter --web.config.file=/config/prometheus_node_exporter/node_exporter_web.yml $(bashio::config 'cmdline_extra_args' '')

prometheus_node_exporter/rootfs/run.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env bashio
+# ==============================================================================
+# Home Assistant Community Add-on: Prometheus Node Exporter
+# Runs the Prometheus Node Exporter
+# ==============================================================================
+#
+# WHAT IS THIS FILE?!
+#
+# The Prometheus Node Exporter add-on runs in the host PID namespace, therefore it cannot
+# use the regular S6-Overlay; hence this add-on uses a "old school" script
+# to run; with a couple of "hacks" to make it work.
+# ==============================================================================
+/etc/cont-init.d/node_exporter.sh
+
+# Start Prometheus Node Exporter
+exec /etc/services.d/node_exporter/run