Merge pull request #65407 from alunduil/add-zfs-replication

Add zfs replication

nixos/modules/services/backup/zfs-replication.nix

···
+{ lib, pkgs, config, ... }:
+
+with lib;
+
+let
+  cfg = config.services.zfs.autoReplication;
+  recursive = optionalString cfg.recursive " --recursive";
+  followDelete = optionalString cfg.followDelete " --follow-delete";
+in {
+  options = {
+    services.zfs.autoReplication = {
+      enable = mkEnableOption "ZFS snapshot replication.";
+
+      followDelete = mkOption {
+        description = "Remove remote snapshots that don't have a local correspondant.";
+        default = true;
+        type = types.bool;
+      };
+
+      host = mkOption {
+        description = "Remote host where snapshots should be sent.";
+        example = "example.com";
+        type = types.str;
+      };
+
+      identityFilePath = mkOption {
+        description = "Path to SSH key used to login to host.";
+        example = "/home/username/.ssh/id_rsa";
+        type = types.path;
+      };
+
+      localFilesystem = mkOption {
+        description = "Local ZFS fileystem from which snapshots should be sent.  Defaults to the attribute name.";
+        example = "pool/file/path";
+        type = types.str;
+      };
+
+      remoteFilesystem = mkOption {
+        description = "Remote ZFS filesystem where snapshots should be sent.";
+        example = "pool/file/path";
+        type = types.str;
+      };
+
+      recursive = mkOption {
+        description = "Recursively discover snapshots to send.";
+        default = true;
+        type = types.bool;
+      };
+
+      username = mkOption {
+        description = "Username used by SSH to login to remote host.";
+        example = "username";
+        type = types.str;
+      };
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    environment.systemPackages = [
+      pkgs.lz4
+    ];
+
+    systemd.services."zfs-replication" = {
+      after = [
+        "zfs-snapshot-daily.service"
+        "zfs-snapshot-frequent.service"
+        "zfs-snapshot-hourly.service"
+        "zfs-snapshot-monthly.service"
+        "zfs-snapshot-weekly.service"
+      ];
+      description = "ZFS Snapshot Replication";
+      documentation = [
+        "https://github.com/alunduil/zfs-replicate"
+      ];
+      restartIfChanged = false;
+      serviceConfig.ExecStart = "${pkgs.zfs-replicate}/bin/zfs-replicate${recursive} -l ${escapeShellArg cfg.username} -i ${escapeShellArg cfg.identityFilePath}${followDelete} ${escapeShellArg cfg.host} ${escapeShellArg cfg.remoteFilesystem} ${escapeShellArg cfg.localFilesystem}";
+      wantedBy = [
+        "zfs-snapshot-daily.service"
+        "zfs-snapshot-frequent.service"
+        "zfs-snapshot-hourly.service"
+        "zfs-snapshot-monthly.service"
+        "zfs-snapshot-weekly.service"
+      ];
+    };
+  };
+
+  meta = {
+    maintainers = with lib.maintainers; [ alunduil ];
+  };
+}

pkgs/development/python-modules/stringcase/default.nix

···
+{ buildPythonPackage, fetchPypi, stdenv
+}:
+
+buildPythonPackage rec {
+  pname = "stringcase";
+  version = "1.2.0";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "023hv3gknblhf9lx5kmkcchzmbhkdhmsnknkv7lfy20rcs06k828";
+  };
+
+  # PyPi package does not include tests.
+  doCheck = false;
+
+  meta = with stdenv.lib; {
+    homepage = https://github.com/okunishinishi/python-stringcase;
+    description = "Convert string cases between camel case, pascal case, snake case etc…";
+    license = licenses.mit;
+    maintainers = with maintainers; [ alunduil ];
+  };
+}

pkgs/tools/backup/zfs-replicate/default.nix

···
+{ buildPythonApplication, click, fetchPypi, hypothesis, mypy, pytest
+, pytestcov, pytestrunner, stdenv, stringcase
+}:
+
+buildPythonApplication rec {
+  pname = "zfs-replicate";
+  version = "1.1.11";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "0386xc6rw6bhzw2a08g90afb3snqhm1ikx65bjfh22ha69fwmga8";
+  };
+
+  checkInputs = [
+    hypothesis
+    mypy
+    pytest
+    pytestcov
+  ];
+
+  buildInputs = [
+    pytestrunner
+  ];
+
+  propagatedBuildInputs = [
+    click
+    stringcase
+  ];
+
+  doCheck = true;
+
+  checkPhase = ''
+    pytest --doctest-modules
+  '';
+
+  meta = with stdenv.lib; {
+    homepage = https://github.com/alunduil/zfs-replicate;
+    description = "ZFS Snapshot Replication";
+    license = licenses.bsd2;
+    maintainers = with maintainers; [ alunduil ];
+  };
+}

pkgs/top-level/all-packages.nix

···
   dapper = callPackage ../development/tools/dapper { };
 
   kube3d =  callPackage ../applications/networking/cluster/kube3d {};
+
+  zfs-replicate = python3Packages.callPackage ../tools/backup/zfs-replicate { };
 }

pkgs/top-level/python-packages.nix

···
   pydantic = callPackage ../development/python-modules/pydantic { };
 
   fastapi = callPackage ../development/python-modules/fastapi { };
+
+  stringcase = callPackage ../development/python-modules/stringcase { };
 });
 
 in fix' (extends overrides packages)