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{ config, pkgs, lib, ... }:
with lib;
let
zfssnap = pkgs.stdenv.mkDerivation rec {
name = "zfssnap";
src = ./zfssnap.py;
phases = [ "buildPhase" "checkPhase" "installPhase" ];
buildInputs = with pkgs; [makeWrapper];
python = pkgs.python39.withPackages (ps: with ps; [pyxdg pytimeparse dateutil]);
buildPhase = ''
substitute $src zfssnap \
--subst-var-by python ${escapeShellArg python}
'';
doCheck = true;
checkPhase = ''
${python}/bin/python -m py_compile zfssnap
'';
installPhase = ''
install -m 0755 -D -t $out/bin \
zfssnap
wrapProgram $out/bin/zfssnap \
--prefix PATH : ${makeBinPath [config.boot.zfs.package]}
'';
};
cfg = config.services.zfssnap;
in {
options = {
services.zfssnap = {
enable = mkEnableOption "zfssnap service";
config = mkOption {
type = with types; attrsOf (attrsOf str);
default = {
keep = {
within = "5m";
"5m" = "24";
hourly = "24";
daily = "31";
monthly = "-1";
};
};
};
snapInterval = mkOption {
type = types.str;
default = "*-*-* *:00/5:00";
};
};
};
config = mkIf cfg.enable {
systemd.services."zfssnap" = {
description = "Create automatic ZFS snapshots";
after = [ "zfs-import.target" ];
wants = [ "zfssnap-prune.service" ];
before = [ "zfssnap-prune.service" ];
serviceConfig = {
Type = "oneshot";
ExecStart = "${zfssnap}/bin/zfssnap -v";
};
};
systemd.services."zfssnap-prune" = {
description = "Prune automatic ZFS snapshots";
after = [ "zfs-import.target" "zfssnap.service" ];
serviceConfig = {
Type = "oneshot";
ExecStart = let
mkSectionName = name: strings.escape [ "[" "]" ] (strings.toUpper name);
zfssnapConfig = generators.toINI { inherit mkSectionName; } cfg.config;
in "${zfssnap}/bin/zfssnap -v prune --dry-run --config=${pkgs.writeText "zfssnap.ini" zfssnapConfig}";
};
};
systemd.timers."zfssnap" = {
wantedBy = ["timers.target"];
timerConfig = {
OnCalendar = cfg.snapInterval;
Persistent = true;
};
};
environment.systemPackages = [zfssnap];
};
}
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