Add prometheus textcollector for Arch repositories

Export the repository size of our repositories so they can be monitored
and we have some useful data for repository growth in the future.

roles/grafana/files/dashboards/repository.json

+{
+  "annotations": {
+    "list": [
+      {
+        "builtIn": 1,
+        "datasource": "-- Grafana --",
+        "enable": true,
+        "hide": true,
+        "iconColor": "rgba(0, 211, 255, 1)",
+        "name": "Annotations & Alerts",
+        "type": "dashboard"
+      }
+    ]
+  },
+  "description": "Arch Repository Sizes",
+  "editable": true,
+  "gnetId": null,
+  "graphTooltip": 0,
+  "id": 32,
+  "links": [],
+  "panels": [
+    {
+      "aliasColors": {},
+      "bars": false,
+      "dashLength": 10,
+      "dashes": false,
+      "datasource": "Prometheus",
+      "description": "The size of all our repositories",
+      "fieldConfig": {
+        "defaults": {
+          "custom": {},
+          "unit": "decbytes"
+        },
+        "overrides": []
+      },
+      "fill": 1,
+      "fillGradient": 0,
+      "gridPos": {
+        "h": 14,
+        "w": 24,
+        "x": 0,
+        "y": 0
+      },
+      "hiddenSeries": false,
+      "id": 2,
+      "legend": {
+        "avg": false,
+        "current": false,
+        "max": false,
+        "min": false,
+        "show": true,
+        "total": false,
+        "values": false
+      },
+      "lines": true,
+      "linewidth": 1,
+      "nullPointMode": "null",
+      "options": {
+        "alertThreshold": true
+      },
+      "percentage": false,
+      "pluginVersion": "7.4.2",
+      "pointradius": 2,
+      "points": false,
+      "renderer": "flot",
+      "seriesOverrides": [],
+      "spaceLength": 10,
+      "stack": false,
+      "steppedLine": false,
+      "targets": [
+        {
+          "expr": "repository_directory_size_bytes",
+          "interval": "",
+          "legendFormat": "{{ name }}",
+          "queryType": "randomWalk",
+          "refId": "A"
+        },
+        {
+          "expr": "sum(repository_directory_size_bytes)",
+          "hide": false,
+          "interval": "",
+          "legendFormat": "total",
+          "refId": "B"
+        }
+      ],
+      "thresholds": [],
+      "timeFrom": null,
+      "timeRegions": [],
+      "timeShift": null,
+      "title": "Repository sizes",
+      "tooltip": {
+        "shared": true,
+        "sort": 0,
+        "value_type": "individual"
+      },
+      "type": "graph",
+      "xaxis": {
+        "buckets": null,
+        "mode": "time",
+        "name": null,
+        "show": true,
+        "values": []
+      },
+      "yaxes": [
+        {
+          "$$hashKey": "object:68",
+          "format": "decbytes",
+          "label": null,
+          "logBase": 1,
+          "max": null,
+          "min": null,
+          "show": true
+        },
+        {
+          "$$hashKey": "object:69",
+          "format": "short",
+          "label": null,
+          "logBase": 1,
+          "max": null,
+          "min": null,
+          "show": true
+        }
+      ],
+      "yaxis": {
+        "align": false,
+        "alignLevel": null
+      }
+    }
+  ],
+  "schemaVersion": 27,
+  "style": "dark",
+  "tags": [],
+  "templating": {
+    "list": []
+  },
+  "time": {
+    "from": "now-6M",
+    "to": "now"
+  },
+  "timepicker": {},
+  "timezone": "",
+  "title": "Arch Repositories",
+  "uid": "hXmUEbsGk",
+  "version": 1
+}
\ No newline at end of file

roles/prometheus_exporters/files/repository-textcollector.sh

+#!/bin/bash
+
+set -o errexit
+set -o nounset
+
+if (( $# != 1 )); then
+  echo "Missing textcollector directory argument"
+  exit 1
+fi
+
+TEXTFILE_COLLECTOR_DIR=${1}
+REPOS_DIR=/srv/ftp
+PROM_FILE=$TEXTFILE_COLLECTOR_DIR/repository.prom
+
+TMP_FILE=$PROM_FILE.$$
+[ -e $TMP_FILE ] && rm -f $TMP_FILE
+
+trap "rm -f $TMP_FILE" EXIT
+
+echo "# HELP repository_directory_size_bytes repository directory size in bytes" >> $TMP_FILE
+echo "# TYPE repository_directory_size_bytes gauge" >> $TMP_FILE
+
+for dir in $REPOS_DIR/*; do
+  # All Arch repositories should have an os dir, this excludes the archive and other non repo dirs.
+  if [ -d "$dir/os" ]; then
+    reponame=$(basename $dir)
+    directory_size=$(du -Lsb ${dir} | awk '{ print $1 }')
+
+    echo "repository_directory_size_bytes{name=\"${reponame}\"} $directory_size" >> $TMP_FILE
+  fi
+done
+
+mv -f $TMP_FILE $PROM_FILE

roles/prometheus_exporters/tasks/main.yml

@@ -55,6 +55,7 @@
     - rebuilderd-textcollector.sh
     - rebuilderd-status-textcollector.py
     - archive-textcollector.sh
+    - repository-textcollector.sh
     - btrfs-textcollector.sh
 
 - name: install arch textcollector service
@@ -98,6 +99,10 @@
   template: src=prometheus-archive-textcollector.service.j2 dest=/etc/systemd/system/prometheus-archive-textcollector.service owner=root group=root mode=644
   when: "'archive_mirrors' in group_names or inventory_hostname == 'gemini.archlinux.org'"
 
+- name: install rebuilderd textcollector service
+  template: src=prometheus-repository-textcollector.service.j2 dest=/etc/systemd/system/prometheus-repository-textcollector.service owner=root group=root mode=644
+  when: "inventory_hostname == 'gemini.archlinux.org'"
+
 - name: install rebuilderd textcollector timer
   template: src=prometheus-archive-textcollector.timer.j2 dest=/etc/systemd/system/prometheus-archive-textcollector.timer owner=root group=root mode=644
   when: "'archive_mirrors' in group_names or inventory_hostname == 'gemini.archlinux.org'"
@@ -106,6 +111,14 @@
   systemd: name=prometheus-archive-textcollector.timer enabled=yes daemon_reload=yes state=started
   when: "'archive_mirrors' in group_names or inventory_hostname == 'gemini.archlinux.org'"
 
+- name: install rebuilderd textcollector timer
+  template: src=prometheus-repository-textcollector.timer.j2 dest=/etc/systemd/system/prometheus-repository-textcollector.timer owner=root group=root mode=644
+  when: "inventory_hostname == 'gemini.archlinux.org'"
+
+- name: enable and start prometheus repository textcollector timer
+  systemd: name=prometheus-repository-textcollector.timer enabled=yes daemon_reload=yes state=started
+  when: "inventory_hostname == 'gemini.archlinux.org'"
+
 - name: install sudoers for btrfs
   copy: src=sudoers dest=/etc/sudoers.d/node_exporter owner=root group=root mode=0440
   when: filesystem == "btrfs"

roles/prometheus_exporters/templates/prometheus-repository-textcollector.service.j2

+[Unit]
+Description=Prometheus Arch Repository Exporter
+After=network.target
+
+[Service]
+Type=oneshot
+User=node_exporter
+ExecStart=/usr/local/bin/repository-textcollector.sh {{ prometheus_textfile_dir }}
+
+NoNewPrivileges=true
+LockPersonality=true
+CapabilityBoundingSet=
+UMask=077
+
+PrivateDevices=true
+PrivateTmp=true
+ProtectSystem=strict
+ProtectHome=true
+ReadWritePaths={{ prometheus_textfile_dir }}
+
+MemoryDenyWriteExecute=true
+RemoveIPC=true
+RestrictRealtime=true
+RestrictNamespaces=true
+RestrictSUIDSGID=true
+
+RestrictAddressFamilies=~AF_NETLINK
+RestrictAddressFamilies=~AF_PACKET
+
+ProtectHostname=true
+ProtectControlGroups=true
+ProtectKernelLogs=true
+ProtectKernelTunables=true
+ProtectKernelModules=true
+ProtectClock=true
+
+SystemCallArchitectures=native

roles/prometheus_exporters/templates/prometheus-repository-textcollector.timer.j2

+[Unit]
+Description=Prometheus Arch Repository Exporter TextCollector Timer
+
+[Timer]
+# 24 hours
+OnUnitActiveSec=1440m
+OnBootSec=15min
+RandomizedDelaySec=1min
+
+[Install]
+WantedBy=timers.target