From 67d3a55df5dd7a96d21781a581c249a9e50caaec Mon Sep 17 00:00:00 2001
From: lassulus <lassulus@lassul.us>
Date: Fri, 22 Mar 2019 07:57:34 +0100
Subject: k: add syncthing module

---
 krebs/3modules/default.nix   |   1 +
 krebs/3modules/syncthing.nix | 129 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 130 insertions(+)
 create mode 100644 krebs/3modules/syncthing.nix

diff --git a/krebs/3modules/default.nix b/krebs/3modules/default.nix
index 9c2f53cb..567c077e 100644
--- a/krebs/3modules/default.nix
+++ b/krebs/3modules/default.nix
@@ -48,6 +48,7 @@ let
       ./rtorrent.nix
       ./secret.nix
       ./setuid.nix
+      ./syncthing.nix
       ./tinc.nix
       ./tinc_graphs.nix
       ./urlwatch.nix
diff --git a/krebs/3modules/syncthing.nix b/krebs/3modules/syncthing.nix
new file mode 100644
index 00000000..389da81d
--- /dev/null
+++ b/krebs/3modules/syncthing.nix
@@ -0,0 +1,129 @@
+{ config, pkgs, ... }: with import <stockholm/lib>;
+
+let
+
+  cfg = config.krebs.syncthing;
+
+  devices = mapAttrsToList (name: peer: {
+    name = name;
+    deviceID = peer.id;
+    addresses = peer.addresses;
+  }) cfg.peers;
+
+  folders = map (folder: {
+    inherit (folder) path type;
+    id = folder.path;
+    devices = map (peer: { deviceId = cfg.peers.${peer}.id; }) folder.peers;
+    rescanIntervalS = folder.rescanInterval;
+  }) cfg.folders;
+
+  getApiKey = pkgs.writeDash "getAPIKey" ''
+    ${pkgs.libxml2}/bin/xmllint \
+      --xpath 'string(configuration/gui/apikey)'\
+      ${config.services.syncthing.dataDir}/config.xml
+  '';
+
+  updateConfig = pkgs.writeDash "merge-syncthing-config" ''
+    set -efu
+    API_KEY=$(${getApiKey})
+    CFG=$(${pkgs.curl}/bin/curl -Ss -H "X-API-Key: $API_KEY" localhost:8384/rest/system/config)
+    echo "$CFG" | ${pkgs.jq}/bin/jq -s '.[] * {
+      "devices": ${builtins.toJSON devices},
+      "folders": ${builtins.toJSON folders}
+    }' | ${pkgs.curl}/bin/curl -Ss -H "X-API-Key: $API_KEY" localhost:8384/rest/system/config -d @-
+    ${pkgs.curl}/bin/curl -Ss -H "X-API-Key: $API_KEY" localhost:8384/rest/system/restart -X POST
+  '';
+
+in
+
+{
+  options.krebs.syncthing = {
+
+    enable = mkEnableOption "syncthing-init";
+
+    id = mkOption {
+      type = types.str;
+      default = config.krebs.build.host.name;
+    };
+
+    cert = mkOption {
+      type = types.nullOr types.absolute-pathname;
+      default = null;
+    };
+
+    key = mkOption {
+      type = types.nullOr types.absolute-pathname;
+      default = null;
+    };
+
+    peers = mkOption {
+      default = {};
+      type = types.attrsOf (types.submodule ({
+        options = {
+
+          # TODO make into addr + port submodule
+          addresses = mkOption {
+            type = types.listOf types.str;
+            default = [];
+          };
+
+          #TODO check
+          id = mkOption {
+            type = types.str;
+          };
+
+        };
+      }));
+    };
+
+    folders = mkOption {
+      default = [];
+      type = types.listOf (types.submodule ({
+        options = {
+
+          path = mkOption {
+            type = types.absolute-pathname;
+          };
+
+          peers = mkOption {
+            type = types.listOf types.str;
+            default = [];
+          };
+
+          rescanInterval = mkOption {
+            type = types.int;
+            default = 60;
+          };
+
+          type = mkOption {
+            type = types.enum [ "sendreceive" "sendonly" "receiveonly" ];
+            default = "sendreceive";
+          };
+
+        };
+      }));
+    };
+  };
+
+  config = (mkIf cfg.enable) {
+
+    systemd.services.syncthing = mkIf (cfg.cert != null || cfg.key != null) {
+      preStart = ''
+        ${optionalString (cfg.cert != null) "cp ${toString cfg.cert} ${config.services.syncthing.dataDir}/cert.pem"}
+        ${optionalString (cfg.key != null) "cp ${toString cfg.key} ${config.services.syncthing.dataDir}/key.pem"}
+      '';
+    };
+
+    systemd.services.syncthing-init = {
+      after = [ "syncthing.service" ];
+      wantedBy = [ "multi-user.target" ];
+
+      serviceConfig = {
+        User = config.services.syncthing.user;
+        RemainAfterExit = true;
+        Type = "oneshot";
+        ExecStart = updateConfig;
+      };
+    };
+  };
+}
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