implement backup module and use on ytnix

flake.nix

@@ -102,6 +102,7 @@
               }
               ./hosts/ytnix
               inputs.sops-nix.nixosModules.sops
+              ./modules
             ];
           };
 
@@ -113,6 +114,7 @@
               }
               ./hosts/chunk
               inputs.sops-nix.nixosModules.sops
+              ./modules
             ];
           };
 
@@ -125,6 +127,7 @@
               ./hosts/titan
               disko.nixosModules.disko
               inputs.sops-nix.nixosModules.sops
+              ./modules
             ];
           };
         };

hosts/chunk/borg.nix

@@ -48,11 +48,11 @@
     # warnings are often not that serious
     failOnWarnings = false;
     postHook = ''
-      ${pkgs.curl}/bin/curl -u $(cat ${
+      ${pkgs.curl}/bin/curl -O /dev/null -u $(cat ${
         config.sops.secrets."services/ntfy".path
       }) -d "chunk: backup completed with exit code: $exitStatus
-      $(journalctl -u borgbackup-job-crashRsync.service|tail -n 5)" \
-      https://ntfy.cything.io/chunk
+      $(journalctl --output-fields=MESSAGE -o cat -qu borgbackup-job-crashRsync.service |tail -n 10)
+      " https://ntfy.cything.io/ytnix
     '';
 
     prune.keep = {

hosts/ytnix/default.nix

@@ -188,66 +188,20 @@
 
   programs.sway.enable = true;
 
-  services.borgbackup.jobs.ytnixRsync = {
-    # systemd.timer(5)
-    persistentTimer = true;
-    paths = [
-      "/root"
-      "/home"
-      "/var/lib"
-      "/opt"
-      "/etc"
-    ];
+  my.backup= {
+    enable = true;
+    jobName = "ytnixRsync";
     exclude = [
-      "**/.cache"
-      "**/node_modules"
-      "**/cache"
-      "**/Cache"
-      "/var/lib/docker"
       "/var/lib/private/ollama"
-      "/var/lib/libvirt"
-      "/var/lib/systemd"
       "/home/**/Downloads"
-      "**/.rustup"
-      "**/.cargo"
-      "**/.docker"
-      "**/borg"
       "/home/yt/fun"
       "/home/yt/.local/share/Steam"
       "**/.wine"
       "/home/yt/Games"
     ];
-    repo = "de3911@de3911.rsync.net:borg/yt";
-    encryption = {
-      mode = "repokey-blake2";
-      passCommand = ''cat ${config.sops.secrets."borg/rsyncnet".path}'';
-    };
-    environment = {
-      BORG_RSH = ''ssh -i ${config.sops.secrets."rsyncnet/id_ed25519".path}'';
-      BORG_REMOTE_PATH = "borg1";
-      BORG_EXIT_CODES = "modern";
-    };
-    compression = "auto,zstd,8";
-    startAt = "hourly";
-    extraCreateArgs = [
-      "--stats"
-      "-x"
-    ];
-    # warnings are often not that serious
-    failOnWarnings = false;
-    postHook = ''
-      ${pkgs.curl}/bin/curl -u $(cat ${
-        config.sops.secrets."services/ntfy".path
-      }) -d "ytnixRsync: backup completed with exit code: $exitStatus
-      $(journalctl -u borgbackup-job-ytnixRsync.service|tail -n 5)" \
-      https://ntfy.cything.io/chunk
-    '';
-
-    prune.keep = {
-      within = "2d";
-      daily = 365;
-    };
-    extraPruneArgs = [ "--stats" ];
+    repo = "yt";
+    passFile = config.sops.secrets."borg/rsyncnet".path;
+    sshKeyFile = config.sops.secrets."rsyncnet/id_ed25519".path;
   };
 
   services.btrbk.instances.local = {

modules/backup.nix

@@ -0,0 +1,112 @@
+{ config, lib, pkgs, ... }: let
+  cfg = config.my.backup;
+  hostname = config.networking.hostName;
+  defaultPaths = [
+    "/root"
+    "/home"
+    "/var/lib"
+    "/opt"
+    "/etc"
+    "/var/backup"
+  ];
+  defaultExclude = [
+    "**/.cache"
+    "**/node_modules"
+    "**/cache"
+    "**/Cache"
+    "/var/lib/docker"
+    "/var/lib/systemd"
+    "/var/lib/libvirt"
+    "**/.rustup"
+    "**/.cargo"
+    "**/.docker"
+    "**/borg"
+  ];
+in {
+  options.my.backup = {
+    enable = lib.mkEnableOption "backup";
+    paths = lib.mkOption {
+      type = lib.types.listOf lib.types.str;
+      default = [];
+      description = "Paths to backup. Appended to the list of defaultPaths";
+    };
+    exclude = lib.mkOption {
+      type = lib.types.listOf lib.types.str;
+      default = [];
+      description = "Paths to exclude. Appended to the list of defaultExclude";
+    };
+    repo = lib.mkOption {
+      type = lib.types.str;
+      description = "Borg repository to backup to. This is appended to `de3911@de3911.rsync.net:borg/`.";
+    };
+    startAt = lib.mkOption {
+      type = lib.types.str;
+      default = "hourly";
+      description = "see systemd.timer(5)";
+    };
+    jobName = lib.mkOption {
+      type = lib.types.str;
+      description = "Name of the job to run as. Archives created are prefixed with hostName-jobName";
+    };
+    passFile = lib.mkOption {
+      type = lib.types.str;
+      description = "Path to the file containing the encryption passphrase";
+    };
+    sshKeyFile = lib.mkOption {
+      type = lib.types.str;
+      description = "Path to the file containg the SSH identity key";
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    programs.ssh.knownHostsFiles = [
+      (pkgs.writeText "rsyncnet-keys" ''
+        de3911.rsync.net ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIObQN4P/deJ/k4P4kXh6a9K4Q89qdyywYetp9h3nwfPo
+      '')
+    ]; # needs to be a list
+
+    services.borgbackup.jobs.${cfg.jobName} = {
+      inherit (cfg) startAt;
+
+      # systemd.timer(5)
+      persistentTimer = true;
+      paths = defaultPaths ++ cfg.paths;
+      exclude = defaultExclude ++ cfg.exclude;
+      repo = "de3911@de3911.rsync.net:borg/" + cfg.repo;
+      encryption = {
+        mode = "repokey-blake2";
+        passCommand = "cat ${cfg.passFile}";
+      };
+      environment = {
+        BORG_RSH = "ssh -i ${cfg.sshKeyFile}";
+        BORG_REMOTE_PATH = "borg1";
+        BORG_EXIT_CODES = "modern";
+      };
+      compression = "auto,zstd,8";
+      extraCreateArgs = [
+        "--stats"
+        "-x"
+      ];
+      # warnings are often not that serious
+      failOnWarnings = false;
+      postHook = ''
+        invocationId=$(systemctl show -p InvocationID --value borgbackup-job-${cfg.jobName}.service)
+        title="${hostname}: backup completed with exit code: $exitStatus"
+        msg=$(journalctl -o cat _SYSTEMD_INVOCATION_ID=$invocationId)
+
+        ${pkgs.curl}/bin/curl -sL -u $(cat ${
+          config.sops.secrets."services/ntfy".path
+        }) \
+        -H "Title: $title" \
+        -d "$msg" \
+        https://ntfy.cything.io/backups > /dev/null
+      '';
+
+      prune.keep = {
+        within = "2d";
+        daily = 365;
+      };
+      extraPruneArgs = [ "--stats" ];
+    };
+  };
+}

modules/default.nix

@@ -0,0 +1,5 @@
+{...}: {
+  imports = [
+    ./backup.nix
+  ];
+}