config/modules/base/zfsborg/default.nix

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{
config,
lib,
pkgs,
...
}: let
mkPreHook = mountpoint: zfs_name: ''
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set -x
${pkgs.util-linux}/bin/mount \
-t zfs \
-o ro \
$(${pkgs.zfs}/bin/zfs list -H -t snapshot -o name ${zfs_name} | sort | tail -1) \
${mountpoint}/.snapshot-latest
cd ${mountpoint}/.snapshot-latest
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'';
in {
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options.mj.base.zfsborg = with lib.types; {
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enable = lib.mkEnableOption "backup zfs snapshots with borg";
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passwordPath = lib.mkOption {type = str;};
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sshKeyPath = lib.mkOption {
type = nullOr path;
default = null;
};
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dirs = lib.mkOption {
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default = {};
type = listOf (submodule (
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{...}: {
options = {
mountpoint = lib.mkOption {type = path;};
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repo = lib.mkOption {type = str;};
paths = lib.mkOption {type = listOf str;};
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patterns = lib.mkOption {
type = listOf str;
default = [];
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};
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backup_at = lib.mkOption {type = str;};
};
}
));
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};
};
config = with config.mj.base.zfsborg;
lib.mkIf enable {
systemd.services =
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lib.listToAttrs (lib.imap0 (
i: attr:
lib.nameValuePair "borgbackup-job-${lib.strings.sanitizeDerivationName attr.mountpoint}-${toString i}" {
serviceConfig.TemporaryFileSystem = "${attr.mountpoint}/.snapshot-latest";
}
)
dirs)
// {
"zfsborg-snapshot-dirs" = {
description = "zfsborg prepare snapshot directories";
wantedBy = ["multi-user.target"];
serviceConfig = {
Type = "oneshot";
ExecStart = let
mountpoints = lib.unique (lib.catAttrs "mountpoint" dirs);
in
builtins.map
(d: "${pkgs.coreutils}/bin/mkdir -p ${d}/.snapshot-latest")
mountpoints;
RemainAfterExit = true;
};
};
};
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services.borgbackup.jobs = builtins.listToAttrs (
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lib.imap0 (
i: attrs: let
mountpoint = builtins.getAttr "mountpoint" attrs;
fs = builtins.getAttr mountpoint config.fileSystems;
in
assert fs.fsType == "zfs";
assert lib.assertMsg
config.mj.base.unitstatus.enable
"config.mj.base.unitstatus.enable must be true";
lib.nameValuePair
"${lib.strings.sanitizeDerivationName mountpoint}-${toString i}"
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({
doInit = true;
repo = attrs.repo;
encryption = {
mode = "repokey-blake2";
passCommand = "cat ${config.mj.base.zfsborg.passwordPath}";
};
paths = attrs.paths;
extraArgs = "--remote-path=borg1";
compression = "auto,lzma";
startAt = attrs.backup_at;
preHook = mkPreHook mountpoint fs.device;
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prune.keep = {
within = "1d";
daily = 7;
weekly = 4;
monthly = 3;
};
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environment =
{
BORG_HOST_ID = let
h = config.networking;
in "${h.hostName}.${h.domain}@${h.hostId}";
}
// lib.optionalAttrs (sshKeyPath != null) {
BORG_RSH = ''ssh -i "${config.mj.base.zfsborg.sshKeyPath}"'';
};
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}
// lib.optionalAttrs (attrs ? patterns) {
patterns = attrs.patterns;
})
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)
dirs
);
mj.base.unitstatus.units = let
sanitized = map lib.strings.sanitizeDerivationName (lib.catAttrs "mountpoint" dirs);
in
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lib.imap0 (i: name: "borgbackup-job-${name}-${toString i}") sanitized;
};
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}