added backupscript derive

hosts/Alaska/default.nix

@@ -4,7 +4,7 @@
 
 {
   imports = [ 
-    (import ./hardware-configuration.nix)
+    ./hardware-configuration.nix
     (import ./modules/dnsmasq.nix)
     (import ./modules/forgejo.nix)
     (import ./modules/nginx.nix)

hosts/Alaska/modules/backup_script.nix

@@ -0,0 +1,152 @@
+{ config, pkgs, system, lib, stdenv, ...}:
+
+let 
+  cfg = config.programs.alaska_backup_script;
+in
+{
+  options.programs.alaska_backup_script = {
+    enable = lib.mkEnableOption (lib.mdDoc "Alaska Backup Script service");
+    package = lib.mkOption {
+      type = lib.types.package;
+      default = self.packages.${system}.alaska_backup_script;
+      defaultText = "pkgs.alaska_backup_script";
+      description = lib.mkDoc ''
+        the alaska backup script
+      '';
+    };
+
+    run_nightly = lib.mkOption {
+      type = lib.types.bool;
+      default = false;
+      description = lib.mdDoc ''
+        Whether to enable the service to auto-run the script
+      '';
+    };
+
+    tmp_mount_point = lib.mkOption {
+      type = lib.types.path;
+      default = /Aurora/backup_drive_mount_point;
+      description = lib.mdDoc ''
+        The point used as the mount point of the primary external backup
+      '';
+    };
+
+    backup1_drive_label = lib.mkOption {
+      type = lib.types.str;
+      default = "AlaskaBackup";
+      description = lib.mdDoc ''
+        The drive label used as the primary backup device
+      '';
+    };
+
+
+    nextcloud = {
+      root_dir = lib.mkOption {
+        type = lib.types.path;
+        default = /Aurora/nextcloud;
+        description = lib.mdDoc ''
+          The root of the nextcloud file directory
+        '';
+      };
+      db_server = lib.mkOption {
+        type = lib.types.str;
+        default = "127.0.0.1";
+        description = lib.mdDoc ''
+          The server to connect to with the nextcloud db credentials and backup
+        '';
+      };
+      db_name = lib.mkOption {
+        type = lib.types.str;
+        default = "nextcloud";
+        description = lib.mdDoc ''
+          The nextcloud database to copy
+        '';
+      };
+      db_user = lib.mkOption {
+        type = lib.types.str;
+        default = "nextcloud";
+        description = lib.mdDoc ''
+          The nextcloud database user to use for backups.
+        '';
+      };
+      db_passfile = lib.mkOption {
+        type = lib.types.path;
+        description = lib.mdDoc ''
+          The filepath to the nextcloud database user password.
+        '';
+      };
+    };
+  };
+
+
+  config = lib.mkIf cfg.enable {
+    stdenv.mkDerivation rec {
+      name = "alaska_backup_script";
+      version = "1.0";
+
+      # runtimeInputs = [ pkgs.rsync ];
+
+      installPhase = "
+        mkdir -p $out/bin 
+        install $src/bin/${name} $out/bin
+      ";
+      
+      src = (pkgs.writeScriptBin "${name}" ''
+        #!/bin/sh
+        echo "Created the temporary mount point if it does not exit"
+        mkdir -p ${builtins.toString cfg.tmp_mount_point}
+
+        echo "Mounting the external backup drive"
+        mount /dev/disk/by-label/${cfg.backup1_drive_label} ${builtins.toString cfg.tmp_mount_point}
+
+      
+        echo "Puttin nextcloud into maintenance mode so that changes cannot happen during the backup"
+        nextcloud-occ maintenance:mode --on
+
+        echo "Backing up the nextcloud database"
+        password='cat ${builtins.toString cfg.nextcloud.db_passfile}'
+        PGPASSWORD="$password" pg_dump \
+          ${builtins.toString cfg.nextcloud.db_name} -h ${builtins.toString cfg.nextcloud.db_server} \
+          -U ${builtins.toString cfg.nextcloud.db_user} \
+          -f ${builtins.toString cfg.tmp_mount_point}/nextcloud-sqlbkp_`date + "%Y%m%d"`.bak
+
+        echo "Backing up the nextcloud files"
+        # -a archive | -v verbose
+        rsync -av ${builtins.toString cfg.nextcloud.root_dir} \
+          ${builtins.toString cfg.tmp_mount_point}/nextcloud
+
+        echo "Get nextcloud out of maintenance mode so that normal operations can resume"
+        nextcloud-occ maintenance:mode --off
+
+        echo "Unmounting the external drive"
+        umount ${cfg.tmp_mount_point}
+
+        echo "Job completed"
+      ''
+      ).overriteAttrs(old: {
+        buildCommand = "${old.buildCommand}\n patchShebangs $out";
+      });
+    };
+
+      config.systemd.services.alaska_backup_script = let
+        pkg = self.packages.${system}.alaska_backup_script;
+      in lib.mkIf cfg.run_nightly {
+        description = "Alaska Nightly Backup Service";
+        serviceConfig = {
+          Type = "oneshot";
+          ExecStart = ''
+            ${pkgs.lib.makeBinPath [ pkgs.screen ]}/bin/screen -dmS AlaskaBackupJob ${pkgs.lib.makeBinPath [ pkgs.bash ]}/bash -c "${cfg.alaska_backup_script.package.out}/alaska_backup_script"
+          '';
+        };
+      };
+
+      config.systemd.timers.alaska_backup_script = let
+        pkg = self.packages.${system}.alaska_backup_script;
+      in lib.mkIf cfg.run_nightly {
+        wantedBy = [ "timers.target" ];
+        partOf = [ "alaska_backup_script.service" ];
+        # timerConfig.OnCalendar
+      };
+    };
+  };
+}