From ea69c8eeba24bf9b0450bb7db0cc01556d8179a9 Mon Sep 17 00:00:00 2001
From: Daniel Frank <git@danielfrank.net>
Date: Tue, 25 Jan 2022 20:00:29 +0100
Subject: [PATCH] Automatically build the collector config

---
 collector.nix | 21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/collector.nix b/collector.nix
index 3d1b2a8..86c09cb 100644
--- a/collector.nix
+++ b/collector.nix
@@ -7,6 +7,15 @@ let
     rev = "76c61a0c0f7d276fd79026b551780e318901adf6";
     sha256 = "0irnc8ffm413aq3sh64sd2457yp2ax4paaf0ss9r1pkbkb8q5dgx";
   };
+  collector-config = pkgs.writeText "collector-config" ''
+    graph_json = https://hopglass-backend.hamburg.freifunk.net/mv1/graph.json
+    nodes_json = https://hopglass-backend.hamburg.freifunk.net/mv1/nodes.json
+    interval = 300
+    interval_forced = true
+    influx_url = http://127.0.0.1:8086/write?db=freifunk&u=knotendaten&p=@@INFLUXPASS@@&precision=s
+    region = ffhh
+    groups_dir = /home/freifunk/ffhh-statsgroups
+    '';
 in
 {
   systemd.services.collector = {
@@ -20,9 +29,15 @@ in
       RestartSec = 65;
       DynamicUser = true;
       PrivateTmp = true;
-      StateDirectory = "collector";
-      # The config file is actually in /var/lib/private/collector, systemd maps that path to /var/lib/collector
-      ExecStart = "${pkgs.ruby.withPackages (ps: with ps; [ json ])}/bin/ruby ${collector}/query-data.influx --config /var/lib/collector/ffhh.conf";
+      RuntimeDirectory = "collector";
+      ExecStart = "${pkgs.ruby.withPackages (ps: with ps; [ json ])}/bin/ruby ${collector}/query-data.influx --config /run/collector/collector-config";
+      ExecStartPre = "${pkgs.writeShellScript "collector-init" ''
+        until [ -s /var/lib/influxdb/knotendaten.pw ]; do
+          sleep 1
+        done
+        read -N 32 -r knotendatenpw < /var/lib/influxdb/knotendaten.pw
+        ${pkgs.gnused}/bin/sed -e "s/@@INFLUXPASS@@/$knotendatenpw/g" "${collector-config}" > /run/collector/collector-config
+        '' }";
     };
   };
 }