289 lines
9.9 KiB
Nix
289 lines
9.9 KiB
Nix
{ config, pkgs, lib, ... }:
|
|
|
|
let
|
|
cfg = config.shb.backup;
|
|
|
|
instanceOptions = {
|
|
enable = lib.mkEnableOption "shb backup instance";
|
|
|
|
backend = lib.mkOption {
|
|
description = "What program to use to make the backups.";
|
|
type = lib.types.enum [ "borgmatic" "restic" ];
|
|
example = "borgmatic";
|
|
};
|
|
|
|
keySopsFile = lib.mkOption {
|
|
description = "Sops file that holds this instance's Borgmatic repository key and passphrase.";
|
|
type = lib.types.path;
|
|
example = "secrets/backup.yaml";
|
|
};
|
|
|
|
sourceDirectories = lib.mkOption {
|
|
description = "Borgmatic source directories.";
|
|
type = lib.types.nonEmptyListOf lib.types.str;
|
|
};
|
|
|
|
excludePatterns = lib.mkOption {
|
|
description = "Borgmatic exclude patterns.";
|
|
type = lib.types.listOf lib.types.str;
|
|
default = [];
|
|
};
|
|
|
|
secretName = lib.mkOption {
|
|
description = "Secret name, if null use the name of the backup instance.";
|
|
type = lib.types.nullOr lib.types.str;
|
|
default = null;
|
|
};
|
|
|
|
repositories = lib.mkOption {
|
|
description = lib.mdDoc "Repositories to back this instance to.";
|
|
type = lib.types.nonEmptyListOf lib.types.str;
|
|
};
|
|
|
|
retention = lib.mkOption {
|
|
description = "Retention options.";
|
|
type = lib.types.attrsOf (lib.types.oneOf [ lib.types.int lib.types.nonEmptyStr ]);
|
|
default = {
|
|
keep_within = "1d";
|
|
keep_hourly = 24;
|
|
keep_daily = 7;
|
|
keep_weekly = 4;
|
|
keep_monthly = 6;
|
|
};
|
|
};
|
|
|
|
consistency = lib.mkOption {
|
|
description = "Consistency frequency options. Only applicable for borgmatic";
|
|
type = lib.types.attrsOf lib.types.nonEmptyStr;
|
|
default = {};
|
|
example = {
|
|
repository = "2 weeks";
|
|
archives = "1 month";
|
|
};
|
|
};
|
|
|
|
hooks = lib.mkOption {
|
|
description = "Borgmatic hooks.";
|
|
default = {};
|
|
type = lib.types.submodule {
|
|
options = {
|
|
before_backup = lib.mkOption {
|
|
description = "Hooks to run before backup";
|
|
type = lib.types.listOf lib.types.str;
|
|
default = [];
|
|
};
|
|
|
|
after_backup = lib.mkOption {
|
|
description = "Hooks to run after backup";
|
|
type = lib.types.listOf lib.types.str;
|
|
default = [];
|
|
};
|
|
};
|
|
};
|
|
};
|
|
|
|
environmentFile = lib.mkOption {
|
|
type = lib.types.bool;
|
|
description = "Add environment file to be read by the systemd service.";
|
|
default = false;
|
|
example = true;
|
|
};
|
|
};
|
|
|
|
repoSlugName = name: builtins.replaceStrings ["/" ":"] ["_" "_"] (lib.strings.removePrefix "/" name);
|
|
|
|
in
|
|
{
|
|
options.shb.backup = {
|
|
onlyOnAC = lib.mkOption {
|
|
description = lib.mdDoc "Run backups only if AC power is plugged in.";
|
|
default = true;
|
|
example = false;
|
|
type = lib.types.bool;
|
|
};
|
|
|
|
user = lib.mkOption {
|
|
description = lib.mdDoc "Unix user doing the backups.";
|
|
type = lib.types.str;
|
|
default = "backup";
|
|
};
|
|
|
|
group = lib.mkOption {
|
|
description = lib.mdDoc "Unix group doing the backups.";
|
|
type = lib.types.str;
|
|
default = "backup";
|
|
};
|
|
|
|
instances = lib.mkOption {
|
|
description = lib.mdDoc "Each instance is a backup setting";
|
|
default = {};
|
|
type = lib.types.attrsOf (lib.types.submodule {
|
|
options = instanceOptions;
|
|
});
|
|
};
|
|
|
|
borgServer = lib.mkOption {
|
|
description = lib.mdDoc "Add borgbackup package so external backups can use this server as a remote.";
|
|
default = false;
|
|
example = true;
|
|
type = lib.types.bool;
|
|
};
|
|
};
|
|
|
|
config = lib.mkIf (cfg.instances != {}) (
|
|
let
|
|
enabledInstances = lib.attrsets.filterAttrs (k: i: i.enable) cfg.instances;
|
|
borgmaticInstances = lib.attrsets.filterAttrs (k: i: i.backend == "borgmatic") enabledInstances;
|
|
resticInstances = lib.attrsets.filterAttrs (k: i: i.backend == "restic") enabledInstances;
|
|
in
|
|
{
|
|
users.users = {
|
|
${cfg.user} = {
|
|
name = cfg.user;
|
|
group = cfg.group;
|
|
home = "/var/lib/backup";
|
|
createHome = true;
|
|
isSystemUser = true;
|
|
extraGroups = [ "keys" ];
|
|
};
|
|
};
|
|
users.groups = {
|
|
${cfg.group} = {
|
|
name = cfg.group;
|
|
};
|
|
};
|
|
|
|
sops.secrets =
|
|
let
|
|
mkSopsSecret = name: instance: (
|
|
[
|
|
{
|
|
"${instance.backend}/passphrases/${if isNull instance.secretName then name else instance.secretName}" = {
|
|
sopsFile = instance.keySopsFile;
|
|
mode = "0440";
|
|
owner = cfg.user;
|
|
group = cfg.group;
|
|
};
|
|
}
|
|
] ++ lib.optional ((lib.filter (lib.strings.hasPrefix "s3") instance.repositories) != []) {
|
|
"${instance.backend}/environmentfiles/${if isNull instance.secretName then name else instance.secretName}" = {
|
|
sopsFile = instance.keySopsFile;
|
|
mode = "0440";
|
|
owner = cfg.user;
|
|
group = cfg.group;
|
|
};
|
|
} ++ lib.optionals (instance.backend == "borgmatic") (lib.flatten (map (repository: {
|
|
"${instance.backend}/keys/${repoSlugName repository}" = {
|
|
key = "${instance.backend}/keys/${if isNull instance.secretName then name else instance.secretName}";
|
|
sopsFile = instance.keySopsFile;
|
|
mode = "0440";
|
|
owner = cfg.user;
|
|
group = cfg.group;
|
|
};
|
|
}) instance.repositories))
|
|
);
|
|
in
|
|
lib.mkMerge (lib.flatten (lib.attrsets.mapAttrsToList mkSopsSecret enabledInstances));
|
|
|
|
systemd.timers.borgmatic = lib.mkIf (borgmaticInstances != {}) {
|
|
timerConfig = {
|
|
OnCalendar = "hourly";
|
|
};
|
|
};
|
|
|
|
systemd.services.borgmatic = lib.mkIf (borgmaticInstances != {}) {
|
|
serviceConfig = {
|
|
User = cfg.user;
|
|
Group = cfg.group;
|
|
ExecStartPre = [ "" ]; # Do not sleep before starting.
|
|
ExecStart = [ "" "${pkgs.borgmatic}/bin/borgmatic --verbosity -1 --syslog-verbosity 1" ];
|
|
# For borgmatic, since we have only one service, we need to merge all environmentFile
|
|
# from all instances.
|
|
EnvironmentFile = lib.mapAttrsToList (name: value: value.environmentFile) enabledInstances;
|
|
};
|
|
};
|
|
|
|
systemd.packages = lib.mkIf (borgmaticInstances != {}) [ pkgs.borgmatic ];
|
|
environment.systemPackages = (
|
|
lib.optionals cfg.borgServer [ pkgs.borgbackup ]
|
|
++ lib.optionals (borgmaticInstances != {}) [ pkgs.borgbackup pkgs.borgmatic ]
|
|
++ lib.optionals (resticInstances != {}) [ pkgs.restic ]
|
|
);
|
|
|
|
services.restic.backups =
|
|
let
|
|
mkRepositorySettings = name: instance: repository: {
|
|
"${name}_${repoSlugName repository}" = {
|
|
inherit (cfg) user;
|
|
inherit repository;
|
|
|
|
paths = instance.sourceDirectories;
|
|
|
|
passwordFile = "/run/secrets/${instance.backend}/passphrases/${name}";
|
|
|
|
initialize = true;
|
|
|
|
timerConfig = {
|
|
OnCalendar = "00,12:00:00";
|
|
RandomizedDelaySec = "5m";
|
|
};
|
|
|
|
pruneOpts = lib.mapAttrsToList (name: value:
|
|
"--${builtins.replaceStrings ["_"] ["-"] name} ${builtins.toString value}"
|
|
) instance.retention;
|
|
|
|
backupPrepareCommand = lib.strings.concatStringsSep "\n" instance.hooks.before_backup;
|
|
|
|
backupCleanupCommand = lib.strings.concatStringsSep "\n" instance.hooks.after_backup;
|
|
} // lib.attrsets.optionalAttrs (instance.environmentFile) {
|
|
environmentFile = "/run/secrets/${instance.backend}/environmentfiles/${name}";
|
|
} // lib.attrsets.optionalAttrs (builtins.length instance.excludePatterns > 0) {
|
|
exclude = instance.excludePatterns;
|
|
};
|
|
};
|
|
|
|
mkSettings = name: instance: builtins.map (mkRepositorySettings name instance) instance.repositories;
|
|
in
|
|
lib.mkMerge (lib.flatten (lib.attrsets.mapAttrsToList mkSettings resticInstances));
|
|
|
|
environment.etc =
|
|
let
|
|
mkSettings = name: instance: {
|
|
"borgmatic.d/${name}.yaml".text = lib.generators.toYAML {} {
|
|
location =
|
|
{
|
|
source_directories = instance.sourceDirectories;
|
|
repositories = instance.repositories;
|
|
}
|
|
// (lib.attrsets.optionalAttrs (builtins.length instance.excludePatterns > 0) {
|
|
excludePatterns = instance.excludePatterns;
|
|
});
|
|
|
|
storage = {
|
|
encryption_passcommand = "cat /run/secrets/borgmatic/passphrases/${if isNull instance.secretName then name else instance.secretName}";
|
|
borg_keys_directory = "/run/secrets/borgmatic/keys";
|
|
};
|
|
|
|
retention = instance.retention;
|
|
consistency.checks =
|
|
let
|
|
mkCheck = name: frequency: {
|
|
inherit name frequency;
|
|
};
|
|
in
|
|
lib.attrsets.mapAttrsToList mkCheck instance.consistency;
|
|
|
|
# hooks = lib.mkMerge [
|
|
# lib.optionalAttrs (builtins.length instance.hooks.before_backup > 0) {
|
|
# inherit (instance.hooks) before_backup;
|
|
# }
|
|
# lib.optionalAttrs (builtins.length instance.hooks.after_backup > 0) {
|
|
# inherit (instance.hooks) after_backup;
|
|
# }
|
|
# ];
|
|
};
|
|
};
|
|
in
|
|
lib.mkMerge (lib.attrsets.mapAttrsToList mkSettings borgmaticInstances);
|
|
});
|
|
}
|