btrfs-auto-snapshot

flake.nix

@@ -109,6 +109,7 @@
         inherit (super.callPackage ./pkgs/compress-drv.nix {}) compressDrvWeb;
 
         tmuxbash = super.callPackage ./pkgs/tmuxbash.nix {};
+        btrfs-auto-snapshot = super.callPackage ./pkgs/btrfs-auto-snapshot.nix {};
         nicer = super.callPackage ./pkgs/nicer.nix {};
 
         # TODO: copied from 24.05

hosts/mtworx/configuration.nix

@@ -11,6 +11,7 @@ in {
     ../../modules
     ../../modules/profiles/desktop
     ../../modules/profiles/autorandr
+    ../../modules/profiles/btrfs
   ];
 
   boot = {

hosts/vno1-op5p/configuration.nix

@@ -7,6 +7,9 @@
 in {
   imports = [
     ../../modules
+
+    ../../modules/profiles/btrfs
+
     ../../shared/platform/orangepi5plus.nix
   ];
 

modules/profiles/btrfs/default.nix

@@ -0,0 +1,5 @@
+{pkgs, ...}: {
+  boot.supportedFilesystems = ["btrfs"];
+
+  environment.systemPackages = [pkgs.btrfs-auto-snapshot];
+}

pkgs/btrfs-auto-snapshot.nix

@@ -0,0 +1,72 @@
+{
+  lib,
+  stdenv,
+  fetchFromGitHub,
+  makeWrapper,
+  coreutils,
+  getopt,
+  gnugrep,
+  gnused,
+  btrfs-progs,
+  syslogSupport ? true,
+  util-linux ? null,
+}:
+assert syslogSupport -> util-linux != null;
+  stdenv.mkDerivation rec {
+    version = "2.0.4";
+    pname = "btrfs-auto-snapshot";
+
+    src = fetchFromGitHub {
+      owner = "hunleyd";
+      repo = pname;
+      rev = "v${version}";
+      hash = "sha256-QpuwkGaYAkpu5hYyb360Mr5tHsZc2LzMlKtpS8CyyhI=";
+    };
+
+    dontBuild = true;
+
+    nativeBuildInputs = [makeWrapper];
+
+    installPhase = ''
+      install -Dm755 btrfs-auto-snapshot $out/bin/btrfs-auto-snapshot
+    '';
+
+    wrapperPath = with lib;
+      makeBinPath (
+        [
+          coreutils
+          getopt
+          gnugrep
+          gnused
+          btrfs-progs
+        ]
+        ++ optional syslogSupport util-linux
+      );
+
+    postFixup = ''
+      wrapProgram $out/bin/btrfs-auto-snapshot \
+        --prefix PATH : "${wrapperPath}"
+    '';
+
+    meta = with lib; {
+      description = "BTRFS Automatic Snapshot Service for Linux";
+      homepage = "https://github.com/hunleyd/btrfs-auto-snapshot";
+      license = licenses.gpl2;
+      mainProgram = "btrfs-auto-snapshot";
+      maintainers = with maintainers; [motiejus];
+      platforms = platforms.unix;
+
+      longDescription = ''
+        btrfs-auto-snapshot is a Bash script designed to bring as much of the
+        functionality of the wonderful ZFS snapshot tool zfs-auto-snapshot to
+        BTRFS as possible. Designed to run from cron (using
+        /etc/cron.{daily,hourly,weekly}) it automatically creates a snapshot of
+        the specified BTRFS filesystem (or, optionally, all of them) and then
+        automatically purges the oldest snapshots of that type (hourly, daily, et
+        al) based on a user-defined retention policy.
+
+        Snapshots are stored in a '.btrfs' directory at the root of the BTRFS
+        filesystem being snapped and are read-only by default.
+      '';
+    };
+  }