Merge pull request #16 from wi11-holdsworth/enhancement/15

Create service-agnostic borgbackup helper function

modules/nixos/backup.nix

@@ -0,0 +1,75 @@
+service: servicecfg:
+{
+  # keep-sorted start
+  pkgs,
+  config,
+  lib,
+# keep-sorted end
+}:
+let
+  notify =
+    {
+      tag,
+      msg,
+      location,
+    }:
+    ''
+      ${pkgs.curl}/bin/curl \
+        -H "X-Tags: ${tag},BorgBackup,Server,${location}" \
+        -d "${msg}" \
+        ${config.services.ntfy-sh.settings.base-url}/backups
+    '';
+  notifySuccess =
+    context:
+    notify {
+      tag = "tada";
+      msg = "Backup succeeded";
+      location = "${context}/${service}";
+    };
+  notifyFailure =
+    context:
+    notify {
+      tag = "rotating_light";
+      msg = "Backup failed, check logs";
+      location = "${context}/${service}";
+    };
+  job =
+    context: contextcfg:
+    lib.nameValuePair "${context}-${service}" (
+      {
+        compression = "auto,zstd";
+        startAt = "*-*-* 04:00:00 Australia/Melbourne";
+        prune.keep = {
+          daily = 7;
+          weekly = 4;
+          monthly = 6;
+        };
+        postHook = ''
+          if [ $exitStatus -eq 0 ]; then
+            ${notifySuccess context}
+          else 
+            ${notifyFailure context}
+          fi
+        '';
+      }
+      // contextcfg
+      // servicecfg
+    );
+in
+builtins.listToAttrs [
+  (job "onsite" {
+    repo = "/backup/repo";
+    encryption = {
+      mode = "repokey-blake2";
+      passCommand = "cat ${config.age.secrets.borgbackup-server-onsite.path}";
+    };
+  })
+  (job "offsite" {
+    repo = "vuc5c3xq@vuc5c3xq.repo.borgbase.com:repo";
+    encryption = {
+      mode = "repokey-blake2";
+      passCommand = "cat ${config.age.secrets.borgbackup-server-offsite.path}";
+    };
+    environment.BORG_RSH = "ssh -i /home/srv/.ssh/id_ed25519";
+  })
+]

modules/nixos/bundles/server.nix

@@ -1,4 +1,9 @@
-{ config, lib, ... }:
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
 let
   feature = "server";
 in
@@ -26,6 +31,17 @@ in
     # keep-sorted end
 
     users.groups.media = { };
+
+    services.borgbackup.jobs =
+      import ../backup.nix "srv"
+        {
+          paths = [ "/srv" ];
+        }
+        {
+          inherit config;
+          inherit lib;
+          inherit pkgs;
+        };
   };
 
   imports = [ ];

modules/nixos/features/borgbackup-srv.nix

@@ -1,87 +1,13 @@
 {
   config,
   lib,
-  pkgs,
   ...
 }:
 let
   feature = "borgbackup-srv";
-
-  secret = "borgbackup";
-  notify =
-    {
-      tag,
-      msg,
-      location,
-    }:
-    ''
-      ${pkgs.curl}/bin/curl -H "X-Tags: ${tag},BorgBackup,Server,${location}"  -d "${msg}" ${config.services.ntfy-sh.settings.base-url}/backups
-    '';
-  notifySuccess =
-    location:
-    notify {
-      tag = "tada";
-      msg = "Backup succeeded";
-      inherit location;
-    };
-  notifyFailure =
-    location:
-    notify {
-      tag = "rotating_light";
-      msg = "Backup failed, check logs";
-      inherit location;
-    };
-
 in
 {
   config = lib.mkIf config.${feature}.enable {
-    services.borgbackup.jobs =
-      let
-        srv = location: {
-          paths = [
-            "/srv"
-            "/home/srv/.config/syncthing"
-            "/home/srv/Sync"
-          ];
-
-          compression = "auto,zstd";
-
-          startAt = "*-*-* 04:00:00 Australia/Melbourne";
-
-          prune.keep = {
-            daily = 7;
-            weekly = 4;
-            monthly = 6;
-          };
-
-          postHook = ''
-            if [ $exitStatus -eq 0 ]; then
-              ${notifySuccess location}
-            else
-              ${notifyFailure location}
-            fi
-          '';
-        };
-
-      in
-      {
-        onsite = srv "onsite" // {
-          repo = "/backup/repo";
-
-          encryption.mode = "repokey-blake2";
-          encryption.passCommand = "cat ${config.age.secrets.borgbackup-server-onsite.path}";
-        };
-
-        offsite = srv "offsite" // {
-          repo = "vuc5c3xq@vuc5c3xq.repo.borgbase.com:repo";
-
-          encryption.mode = "repokey-blake2";
-          encryption.passCommand = "cat ${config.age.secrets.borgbackup-server-offsite.path}";
-
-          environment.BORG_RSH = "ssh -i /home/srv/.ssh/id_ed25519";
-        };
-      };
-
     # onsite drive
     services.udisks2.enable = true;
 
@@ -92,11 +18,11 @@ in
 
     # secrets
     age.secrets = {
-      "${secret}-server-onsite" = {
-        file = ../../../secrets/${secret}-server-onsite.age;
+      "borgbackup-server-onsite" = {
+        file = ../../../secrets/borgbackup-server-onsite.age;
       };
-      "${secret}-server-offsite" = {
-        file = ../../../secrets/${secret}-server-offsite.age;
+      "borgbackup-server-offsite" = {
+        file = ../../../secrets/borgbackup-server-offsite.age;
       };
     };
   };

modules/nixos/features/syncthing.nix

@@ -1,6 +1,7 @@
 {
   config,
   lib,
+  pkgs,
   userName,
   hostName,
   ...
@@ -62,6 +63,27 @@ in
         };
       };
 
+      # backup
+      borgbackup.jobs =
+        # we only need one syncthing host to be backed up
+        # choose server because borgbackup is the most fleshed out
+        # on srv currently
+        if userName == "srv" then
+          import ../backup.nix feature
+            {
+              paths = [
+                "/home/srv/.config/syncthing"
+                "/home/srv/Sync"
+              ];
+            }
+            {
+              inherit config;
+              inherit lib;
+              inherit pkgs;
+            }
+        else
+          null;
+
       # reverse proxy
       nginx = {
         virtualHosts."${feature}.fi33.buzz" = {

modules/templates/web-feature.nix

@@ -15,6 +15,9 @@ in
         enable = true;
       };
 
+      # backup
+      borgbackup.jobs = feature { };
+
       # reverse proxy
       nginx.virtualHosts."${feature}.fi33.buzz" = {
         forceSSL = true;