owncast: add archiver

hosts/owncast/default.nix

@@ -1,13 +1,17 @@
 { config, pkgs, ... }:
 
 {
+  imports = [
+    ./owncast-archiver.nix
+  ];
+
   deployment = {
     vcpu = 8;
     mem = 2048;
     persistedShares = [ "/etc" "/home" "/var" ];
     extraShares = [ {
       source = "/glusterfs/big/microvms/c3d2/config/owncast/archive";
-      mountPoint = "/mnt/archive";
+      mountPoint = config.services.owncast-archiver.targetDir;
     } ];
   };
   c3d2.hq.statistics.enable = true;
@@ -38,7 +42,7 @@
         proxyWebsockets = true;
       };
       locations."/archive/" = {
-        alias = "/mnt/archive/";
+        alias = "${config.services.owncast-archiver.targetDir}/";
         extraConfig = ''
           fancyindex on;
           fancyindex_exact_size off;
@@ -46,5 +50,9 @@
       };
     };
   };
-  systemd.services.nginx.serviceConfig.ReadWritePaths = [ "/mnt/archive" ];
+  systemd.services.nginx.serviceConfig.ReadWritePaths = [
+    config.services.owncast-archiver.targetDir
+  ];
+
+  services.owncast-archiver.enable = true;
 }

hosts/owncast/owncast-archiver.nix

@@ -0,0 +1,61 @@
+{ config, lib, pkgs, ... }:
+
+let
+
+  owncastArchiver = with pkgs; writeScript "owncast-archiver.sh" ''
+    #! ${runtimeShell} -e
+
+    PATH=${lib.makeBinPath [ coreutils curl jq ffmpeg ]}
+
+    while true; do
+
+      STATUS="$(curl -s https://owncast.c3d2.de/api/status)"
+      ONLINE="$(echo "$STATUS" | jq -r .online)"
+      if [ "$ONLINE" = true ]; then
+        TITLE="$(echo "$STATUS" | jq -r .streamTitle)"
+        ffmpeg -i https://owncast.c3d2.de/hls/0/stream.m3u8 -c copy "$(echo "$(date -Iseconds)_$TITLE.mkv"|tr " +<>:/" "____\\-\\-")"
+      fi
+
+      sleep ${toString cfg.pollInterval}
+    done
+  '';
+
+  cfg = config.services.owncast-archiver;
+
+in
+
+{
+  options.services.owncast-archiver = with lib; {
+    enable = mkEnableOption "owncast archiver";
+
+    targetDir = mkOption {
+      type = types.str;
+      default = "/mnt/archive";
+    };
+
+    pollInterval = mkOption {
+      type = types.int;
+      default = 10;
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    users.users.archiver = {
+      isSystemUser = true;
+      group = "nginx";
+    };
+
+    systemd.services.owncast-archiver = {
+      wantedBy = [ "multi-user.target" ];
+      after = [ "owncast.service" ];
+      serviceConfig = {
+        ReadWritePaths = cfg.targetDir;
+        WorkingDirectory = cfg.targetDir;
+        User = "archiver";
+        ExecStart = owncastArchiver;
+        Restart = "always";
+        RestartSec = 60;
+      };
+    };
+  };
+}