add kopia module

1 files changed, 75 insertions, 0 deletions

diff --git a/modules/backup/web.nix b/modules/backup/web.nix
new file mode 100644
index 0000000..9937315
--- /dev/null
+++ b/modules/backup/web.nix
@@ -0,0 +1,75 @@
+{
+  pkgs,
+  lib,
+  config,
+  mkInstanceServices,
+  ...
+}:
+let
+  instanceType = lib.types.submodule {
+    options = {
+      web = {
+        enable = lib.mkEnableOption "enable Kopia web interface";
+        guiAddress = lib.mkOption {
+          type = lib.types.str;
+          default = "127.0.0.1:51515";
+        };
+        serverUsername = lib.mkOption {
+          type = lib.types.str;
+          default = "admin";
+          description = "Username for the Kopia web server(basic auth).";
+        };
+        environmentFile = lib.mkOption {
+          type = lib.types.nullOr lib.types.path;
+          default = null;
+          description = "File containing environment variables for kopia web server like password.";
+        };
+      };
+    };
+  };
+in
+{
+  options.services.kopia.instances = lib.mkOption {
+    type = lib.types.attrsOf instanceType;
+  };
+
+  config = lib.mkIf config.services.kopia.enable {
+    # systemd service for repositories open
+    systemd.services =
+      let
+        mkWebService =
+          # refactor with mkRepositoryArgs
+          name: instance:
+          lib.attrsets.nameValuePair "kopia-web-${name}" {
+            description = "Kopia S3 web service";
+            wants = [
+              "kopia-repository-${name}.service"
+            ];
+            after = [ "kopia-repository-${name}.service" ];
+            environment = {
+              KOPIA_SERVER_USERNAME = instance.web.serverUsername;
+            };
+            script = ''
+              export KOPIA_SERVER_USERNAME=${instance.web.serverUsername}
+              # Start Kopia web server
+              ${pkgs.kopia}/bin/kopia server start --insecure --address ${instance.web.guiAddress}
+            '';
+            serviceConfig = {
+              Type = "simple";
+              User = "${instance.user}";
+              WorkingDirectory = "~";
+              SetLoginEnvironment = true;
+              EnvironmentFile = lib.mkIf (instance.web.environmentFile != null) instance.web.environmentFile;
+              # retry on failure
+              Restart = "on-failure";
+              # wait 30 seconds before restarting
+              RestartSec = "30";
+              # limit the number of restarts to 5 in 1 day
+              StartLimitIntervalSec = "1d";
+              StartLimitBurst = "5";
+            };
+          };
+      in
+      mkInstanceServices config.services.kopia.instances mkWebService;
+  };
+}