refactor: Use haumea for filesystem-based module system for flake outputs

refactor: Use hyphen(`-`) for variable names & folder names(except Python), replace all unserscore(`_`) with hyphen(`-`).

hosts/idols-ruby/restic.nix

@@ -0,0 +1,83 @@
+{pkgs, ...}: let
+  passwordFile = "/etc/agenix/restic-password";
+  sshKeyPath = "/etc/agenix/ssh-key-for-restic-backup";
+  rcloneConfigFile = "/etc/agenix/rclone-conf-for-restic-backup";
+in {
+  # https://github.com/NixOS/nixpkgs/blob/nixos-23.11/nixos/modules/services/backup/restic.nix
+  services.restic.backups = {
+    homelab-backup = {
+      inherit passwordFile;
+      initialize = true; # Initialize the repository if it doesn't exist.
+      repository = "rclone:smb-downloads:/Downloads/proxmox-backup/"; # backup to a rclone remote
+
+      # rclone related
+      # rcloneOptions = {
+      #   bwlimit = "100M";  # Limit the bandwidth used by rclone.
+      # };
+      inherit rcloneConfigFile;
+
+      # Which local paths to backup, in addition to ones specified via `dynamicFilesFrom`.
+      paths = [
+        "/tmp/restic-backup-temp"
+      ];
+      #
+      # A script that produces a list of files to back up.  The
+      # results of this command are given to the '--files-from'
+      # option. The result is merged with paths specified via `paths`.
+      # dynamicFilesFrom = "find /home/matt/git -type d -name .git";
+      #
+      # Patterns to exclude when backing up. See
+      #   https://restic.readthedocs.io/en/latest/040_backup.html#excluding-files
+      # for details on syntax.
+      exclude = [];
+
+      # A script that must run before starting the backup process.
+      backupPrepareCommand = ''
+        ${pkgs.nushell}/bin/nu -c '
+          let pve_nodes = [
+            # proxmox cluster's nodes
+            "um560"
+            "gtr5"
+            "s500plus"
+
+            # others
+            "kana"
+          ]
+
+          pve_nodes | each {|it|
+            rsync -avz \
+            -e "ssh -i ${sshKeyPath}"  \
+            $"($it):/var/lib/vz" $"/tmp/restic-backup-temp/($it)"
+          }
+        '
+      '';
+      # A script that must run after finishing the backup process.
+      backupCleanupCommand = "rm -rf /tmp/restic-backup-temp";
+
+      # Extra extended options to be passed to the restic --option flag.
+      # extraOptions = [];
+
+      # Extra arguments passed to restic backup.
+      # extraBackupArgs = [
+      #   "--exclude-file=/etc/restic/excludes-list"
+      # ];
+
+      # repository = "/mnt/backup-hdd"; # backup to a local directory
+      # When to run the backup. See {manpage}`systemd.timer(5)` for details.
+      timerConfig = {
+        OnCalendar = "01:30";
+        RandomizedDelaySec = "1h";
+      };
+      # A list of options (--keep-* et al.) for 'restic forget --prune',
+      # to automatically prune old snapshots.
+      # The 'forget' command is run *after* the 'backup' command, so
+      # keep that in mind when constructing the --keep-* options.
+      pruneOpts = [
+        "--keep-daily 3"
+        "--keep-weekly 3"
+        "--keep-monthly 3"
+        "--keep-yearly 3"
+      ];
+    };
+  };
+}