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|
{ config, lib, pkgs, ... }:
with lib;
let cfg = config.snapraid;
in
{
options.snapraid = with types; {
enable = mkEnableOption "SnapRAID";
dataDisks = mkOption {
default = { };
example = {
d1 = "/mnt/disk1/";
d2 = "/mnt/disk2/";
d3 = "/mnt/disk3/";
};
description = "SnapRAID data disks.";
type = attrsOf str;
};
parityFiles = mkOption {
default = [ ];
example = [
"/mnt/diskp/snapraid.parity"
"/mnt/diskq/snapraid.2-parity"
"/mnt/diskr/snapraid.3-parity"
"/mnt/disks/snapraid.4-parity"
"/mnt/diskt/snapraid.5-parity"
"/mnt/disku/snapraid.6-parity"
];
description = "SnapRAID parity files.";
type = listOf str;
};
contentFiles = mkOption {
default = [ ];
example = [
"/var/snapraid.content"
"/mnt/disk1/snapraid.content"
"/mnt/disk2/snapraid.content"
];
description = "SnapRAID content list files.";
type = listOf str;
};
exclude = mkOption {
default = [ ];
example = [ "*.unrecoverable" "/tmp/" "/lost+found/" ];
description = "SnapRAID exclude directives.";
type = listOf str;
};
touchBeforeSync = mkOption {
default = true;
example = false;
description =
"Whether <command>snapraid touch</command> should be run before <command>snapraid sync</command>.";
type = bool;
};
sync.interval = mkOption {
default = "01:00";
example = "daily";
description = "How often to run <command>snapraid sync</command>.";
type = str;
};
scrub = {
interval = mkOption {
default = "Mon *-*-* 02:00:00";
example = "weekly";
description = "How often to run <command>snapraid scrub</command>.";
type = str;
};
plan = mkOption {
default = 8;
example = 5;
description =
"Percent of the array that should be checked by <command>snapraid scrub</command>.";
type = int;
};
olderThan = mkOption {
default = 10;
example = 20;
description =
"Number of days since data was last scrubbed before it can be scrubbed again.";
type = int;
};
};
extraConfig = mkOption {
default = "";
example = ''
nohidden
blocksize 256
hashsize 16
autosave 500
pool /pool
'';
description = "Extra config options for SnapRAID.";
type = lines;
};
};
config =
let
nParity = builtins.length cfg.parityFiles;
mkPrepend = pre: s: pre + s;
in
mkIf cfg.enable {
assertions = [
{
assertion = nParity <= 6;
message = "You can have no more than six SnapRAID parity files.";
}
{
assertion = builtins.length cfg.contentFiles >= nParity + 1;
message =
"There must be at least one SnapRAID content file for each SnapRAID parity file plus one.";
}
];
environment = {
systemPackages = with pkgs; [ snapraid ];
etc."snapraid.conf" = {
text = with cfg;
let
prependData = mkPrepend "data ";
prependContent = mkPrepend "content ";
prependExclude = mkPrepend "exclude ";
in
concatStringsSep "\n"
(map prependData
((mapAttrsToList (name: value: name + " " + value)) dataDisks)
++ zipListsWith (a: b: a + b)
([ "parity " ] ++ map (i: toString i + "-parity ") (range 2 6))
parityFiles ++ map prependContent contentFiles
++ map prependExclude exclude) + "\n" + extraConfig;
};
};
systemd.services = with cfg; {
snapraid-scrub = {
description = "Scrub the SnapRAID array";
startAt = scrub.interval;
serviceConfig = {
Type = "oneshot";
ExecStart = "${pkgs.snapraid}/bin/snapraid scrub -p ${
toString scrub.plan
} -o ${toString scrub.olderThan}";
Nice = 19;
IOSchedulingPriority = 7;
CPUSchedulingPolicy = "batch";
LockPersonality = true;
MemoryDenyWriteExecute = true;
NoNewPrivileges = true;
PrivateDevices = true;
PrivateTmp = true;
ProtectClock = true;
ProtectControlGroups = true;
ProtectHostname = true;
ProtectKernelLogs = true;
ProtectKernelModules = true;
ProtectKernelTunables = true;
RestrictAddressFamilies = "none";
RestrictNamespaces = true;
RestrictRealtime = true;
RestrictSUIDSGID = true;
SystemCallArchitectures = "native";
SystemCallFilter = "@system-service";
SystemCallErrorNumber = "EPERM";
CapabilityBoundingSet = "CAP_DAC_OVERRIDE";
ProtectSystem = "strict";
ProtectHome = "read-only";
ReadWritePaths =
# scrub requires access to directories containing content files
# to remove them if they are stale
let
contentDirs = map dirOf contentFiles;
in
unique (
attrValues dataDisks ++ contentDirs
);
};
unitConfig.After = "snapraid-sync.service";
};
snapraid-sync = {
description = "Synchronize the state of the SnapRAID array";
startAt = sync.interval;
serviceConfig = {
Type = "oneshot";
ExecStart = "${pkgs.snapraid}/bin/snapraid sync";
Nice = 19;
IOSchedulingPriority = 7;
CPUSchedulingPolicy = "batch";
LockPersonality = true;
MemoryDenyWriteExecute = true;
NoNewPrivileges = true;
PrivateDevices = true;
PrivateTmp = true;
ProtectClock = true;
ProtectControlGroups = true;
ProtectHostname = true;
ProtectKernelLogs = true;
ProtectKernelModules = true;
ProtectKernelTunables = true;
RestrictAddressFamilies = "none";
RestrictNamespaces = true;
RestrictRealtime = true;
RestrictSUIDSGID = true;
SystemCallArchitectures = "native";
SystemCallFilter = "@system-service";
SystemCallErrorNumber = "EPERM";
CapabilityBoundingSet = "CAP_DAC_OVERRIDE";
ProtectSystem = "strict";
ProtectHome = "read-only";
ReadWritePaths =
# sync requires access to directories containing content files
# to remove them if they are stale
let
contentDirs = map dirOf contentFiles;
in
unique (
attrValues dataDisks ++ parityFiles ++ contentDirs
);
} // optionalAttrs touchBeforeSync {
ExecStartPre = "${pkgs.snapraid}/bin/snapraid touch";
};
};
};
};
}
|