Initial commit: LNbits Borg backup NixOS module

.gitignore

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+result

borg-lnbits.nix

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+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.borg-lnbits;
+
+in {
+  options.services.borg-lnbits = {
+    enable = mkEnableOption "LNbits Borg Backup Service";
+
+    dataPath = mkOption {
+      type = types.path;
+      default = "/var/lib/lnbits/data";
+      description = "Path to LNbits data directory";
+    };
+
+    repository = mkOption {
+      type = types.str;
+      example = "ssh://borg@192.168.1.100//mnt/my_ssd/borg-backups/lnbits";
+      description = "Borg repository location (SSH URL or user@host:/path format)";
+    };
+
+    schedule = mkOption {
+      type = types.str;
+      default = "hourly";
+      description = "Backup schedule (hourly, daily, or systemd timer format)";
+    };
+
+    compression = mkOption {
+      type = types.str;
+      default = "auto,lz4";
+      description = "Compression: auto,lz4 (Pi), auto,zstd (RockPro64). 'auto' skips already-compressed files.";
+    };
+
+    passphraseFile = mkOption {
+      type = types.path;
+      default = "/root/secrets/borg-passphrase";
+      description = "Path to Borg passphrase file";
+    };
+
+    sshKeyFile = mkOption {
+      type = types.path;
+      default = "/root/.ssh/borg_backup_key";
+      description = "SSH private key for repository access";
+    };
+
+    retention = {
+      hourly = mkOption { type = types.int; default = 24; };
+      daily = mkOption { type = types.int; default = 7; };
+      weekly = mkOption { type = types.int; default = 4; };
+      monthly = mkOption { type = types.int; default = 6; };
+    };
+
+    alertEmail = mkOption {
+      type = types.nullOr types.str;
+      default = null;
+      description = "Email for alerts (optional)";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    services.borgbackup.jobs.lnbits = {
+      paths = [
+        cfg.dataPath
+        "/tmp/lnbits-snapshot.sqlite3"
+      ];
+
+      exclude = [ "*.log" "*.pyc" "__pycache__" "*.tmp" ];
+      repo = cfg.repository;
+
+      encryption = {
+        mode = "repokey-blake2";
+        passCommand = "cat ${cfg.passphraseFile}";
+      };
+
+      compression = cfg.compression;
+      startAt = cfg.schedule;
+      persistentTimer = true;  # Run missed backups after reboots
+
+      prune.keep = {
+        inherit (cfg.retention) hourly daily weekly monthly;
+      };
+
+      preHook = ''
+        echo "=== LNbits Backup Starting: $(date) ==="
+
+        if [ -f "${cfg.dataPath}/database.sqlite3" ]; then
+          echo "Creating SQLite snapshot..."
+          ${pkgs.sqlite}/bin/sqlite3 "${cfg.dataPath}/database.sqlite3" \
+            ".backup '/tmp/lnbits-snapshot.sqlite3'"
+
+          SIZE=$(stat -c%s "/tmp/lnbits-snapshot.sqlite3")
+          echo "Snapshot created: $SIZE bytes"
+
+          if [ "$SIZE" -lt 1000 ]; then
+            echo "ERROR: Snapshot too small!"
+            rm -f /tmp/lnbits-snapshot.sqlite3
+            exit 1
+          fi
+        else
+          echo "ERROR: Database not found!"
+          exit 1
+        fi
+      '';
+
+      postHook = ''
+        rm -f /tmp/lnbits-snapshot.sqlite3
+
+        # Weekly integrity check (Sundays)
+        if [ $(date +%u) -eq 7 ]; then
+          echo "Running weekly integrity check..."
+          ${pkgs.borgbackup}/bin/borg check --repository-only ${cfg.repository}
+        fi
+
+        echo "=== Backup Complete: $(date) ==="
+      '';
+
+      environment = {
+        BORG_RSH = "ssh -i ${cfg.sshKeyFile} -o StrictHostKeyChecking=accept-new";
+      };
+    };
+
+    # Install required packages and helper commands
+    environment.systemPackages = with pkgs; [
+      borgbackup
+      sqlite
+
+      (writeShellScriptBin "lnbits-borg-list" ''
+        export BORG_PASSPHRASE=$(cat ${cfg.passphraseFile})
+        export BORG_RSH="ssh -i ${cfg.sshKeyFile}"
+        ${borgbackup}/bin/borg list ${cfg.repository} "$@"
+      '')
+
+      (writeShellScriptBin "lnbits-borg-info" ''
+        export BORG_PASSPHRASE=$(cat ${cfg.passphraseFile})
+        export BORG_RSH="ssh -i ${cfg.sshKeyFile}"
+        ${borgbackup}/bin/borg info ${cfg.repository} "$@"
+      '')
+
+      (writeShellScriptBin "lnbits-borg-restore" ''
+        if [ $# -lt 1 ]; then
+          echo "Usage: lnbits-borg-restore <archive-name> [destination]"
+          echo ""
+          echo "Available archives:"
+          lnbits-borg-list
+          exit 1
+        fi
+
+        ARCHIVE="$1"
+        DEST="''${2:-/tmp/lnbits-restore}"
+
+        export BORG_PASSPHRASE=$(cat ${cfg.passphraseFile})
+        export BORG_RSH="ssh -i ${cfg.sshKeyFile}"
+
+        mkdir -p "$DEST"
+        cd "$DEST"
+        echo "Restoring to: $DEST"
+        ${borgbackup}/bin/borg extract ${cfg.repository}::$ARCHIVE
+        echo "Done! Restored files in: $DEST"
+      '')
+
+      (writeShellScriptBin "lnbits-borg-mount" ''
+        MOUNT="''${1:-/mnt/borg-browse}"
+
+        export BORG_PASSPHRASE=$(cat ${cfg.passphraseFile})
+        export BORG_RSH="ssh -i ${cfg.sshKeyFile}"
+
+        mkdir -p "$MOUNT"
+        ${borgbackup}/bin/borg mount ${cfg.repository} "$MOUNT"
+        echo "Mounted at: $MOUNT"
+        echo "Unmount: borg umount $MOUNT"
+      '')
+    ];
+  };
+}

flake.nix

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+{
+  description = "LNbits Borg backup NixOS module";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+
+  outputs = { self, nixpkgs }: {
+    nixosModules.borg-lnbits = import ./borg-lnbits.nix;
+    nixosModules.default = self.nixosModules.borg-lnbits;
+  };
+}