feat(modules/backup): init

1 files changed, 91 insertions, 0 deletions

diff --git a/modules/by-name/ba/backup/module.nix b/modules/by-name/ba/backup/module.nix
new file mode 100644
index 0000000..856a1c3
--- /dev/null
+++ b/modules/by-name/ba/backup/module.nix
@@ -0,0 +1,91 @@
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}: let
+  cfg = config.vhack.backup;
+  snapshots = "/srv/snapshots";
+  postgresUser = "postgres";
+in {
+  options.vhack.backup = {
+    enable = lib.mkEnableOption "backups with restic";
+    user = lib.mkOption {
+      type = lib.types.str;
+      description = "The storagebox-user to use";
+      example = "u384702-sub2";
+    };
+    privateSshKey = lib.mkOption {
+      type = lib.types.path;
+      description = "The age-encrypted ssh-key, passed to agenix";
+    };
+    privatePassword = lib.mkOption {
+      type = lib.types.path;
+      description = "The age-encrypted restic password, passed to agenix";
+    };
+  };
+  config = lib.mkIf cfg.enable {
+    vhack.persist.directories = [
+      {
+        directory = "/root/.ssh";
+        user = "root";
+        group = "root";
+        mode = "0700";
+      }
+    ];
+    age.secrets = {
+      resticpass = {
+        file = cfg.privatePassword;
+        mode = "0700";
+        owner = "root";
+        group = "root";
+      };
+      resticssh = {
+        file = cfg.privateSshKey;
+        mode = "0700";
+        owner = "root";
+        group = "root";
+      };
+    };
+    services.restic.backups = {
+      storagebox = {
+        initialize = true;
+        backupPrepareCommand = ''
+          ${pkgs.sudo}/bin/sudo -u ${postgresUser} ${pkgs.postgresql}/bin/pg_dumpall --clean --if-exists --quote-all-identifiers > /srv/db_backup.sql
+
+          [ -d /srv/snapshots ] || ${pkgs.btrfs-progs}/bin/btrfs subvolume create /srv/snapshots;
+          [ -d /srv/snapshots/srv ] && ${pkgs.btrfs-progs}/bin/btrfs subvolume delete /srv/snapshots/srv;
+          ${pkgs.btrfs-progs}/bin/btrfs subvolume snapshot -r /srv /srv/snapshots/srv;
+
+          # dump() {
+          #   # compression:
+          #   # pg_dump -F t -v "$1" | xz -z -9 -e -T0 > "db_$1.tar.xz"
+          #   pg_dump -v "$1" > "db_$1.tar.xz"
+          # }
+          # # List all databases, and dump each of them in its own file
+          # # psql --list --csv | while read -r line; do echo "$line" | grep ','; done | while IFS=, read -r name _; do  echo "$name"; done | sed '1d' | while read -r db_name; do dump "$db_name"; done
+        '';
+        paths = [
+          snapshots
+        ];
+        exclude = [
+          ".snapshots"
+          "/var/lib/postgresql" # included in the db dump
+        ];
+        extraBackupArgs = [
+          "--verbose" # spam log
+        ];
+        passwordFile = config.age.secrets.resticpass.path;
+        extraOptions = [
+          "rclone.program='ssh -p 23 ${cfg.user}@${cfg.user}.your-storagebox.de -i ${config.age.secrets.resticssh.path}'"
+        ];
+        repository = "rclone: "; # There is only one repository served
+        timerConfig = {
+          Requires = "network-online.target";
+          OnCalendar = "daily";
+          Persistent = true;
+        };
+      };
+    };
+  };
+}