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{ options, config, pkgs, lib, ... }:
with lib;
let
backups = config.restic-backups;
backupOpts = { ... }: {
options = {
user = mkOption {
type = types.str;
default = "root";
};
passwordFile = mkOption {
type = types.str;
};
runBeforeBackup = mkOption {
type = types.str;
default = "";
};
paths = mkOption {
type = with types; listOf str;
default = [];
};
postgresDatabases = mkOption {
type = with types; listOf str;
default = [];
};
sqliteDatabases = mkOption {
type = with types; listOf str;
default = [];
};
influxBuckets = mkOption {
type = with types; listOf str;
default = [];
};
targets = mkOption {
type = with types; listOf str;
default = [ "wanderduene.ctu.cx" "briefkasten.ctu.cx" ];
};
timerConfig = mkOption {
type = types.attrs;
default = {
OnCalendar = "daily";
RandomizedDelaySec = 1200;
};
};
};
};
in {
options.restic-backups = mkOption {
type = with types; attrsOf (submodule backupOpts);
default = {};
};
config = mkIf (backups != {}) {
systemd.services = mapAttrs' (
name: backup: nameValuePair "restic-backup-${name}" {
restartIfChanged = false;
requires = [ "network.target" "local-fs.target" ];
onFailure = [ "email-notify@%i.service" ];
path = [
pkgs.restic
] ++ optionals (backup.postgresDatabases != []) [
config.services.postgresql.package
pkgs.zstd
];
serviceConfig = {
Type = "oneshot";
User = backup.user;
RuntimeDirectory = "restic-backup-${name}";
CacheDirectory = "restic-backup-${name}";
CacheDirectoryMode = "0700";
# ReadWritePaths = backup.paths;
PrivateTmp = true;
ProtectHome = true;
ProtectSystem = "strict";
Environment = "RESTIC_PASSWORD_FILE=/tmp/passwordFile";
ExecStartPre = [
(
"!" + (pkgs.writeScript "privileged-pre-start" (''
#!${pkgs.runtimeShell}
set -eu pipefail
cp ${backup.passwordFile} /tmp/passwordFile;
${if builtins.elem "briefkasten.ctu.cx" backup.targets then ''
cp /run/agenix/restic-server-briefkasten /tmp/briefkasten.ctu.cx;
'' else "" }
${if builtins.elem "wanderduene.ctu.cx" backup.targets then ''
cp /run/agenix/restic-server-wanderduene /tmp/wanderduene.ctu.cx;
'' else "" }
chown -R ${backup.user} /tmp
''))
)
(
pkgs.writeScript "pre-start" (''
#!${pkgs.runtimeShell}
set -eu pipefail
${backup.runBeforeBackup}
'' + concatMapStringsSep "\n" (db: ''
echo "Dumping Postgres-database: ${db}"
mkdir -p /tmp/postgresDatabases
pg_dump ${db} | zstd --rsyncable > /tmp/postgresDatabases/${db}.sql.zst
[ $(du -b /tmp/postgresDatabases/${db}.sql.zst | cut -f1) -gt "50" ] || exit 1
'') backup.postgresDatabases + concatMapStringsSep "\n" (db: ''
echo "Dumping sqlite-database: ${db}"
mkdir -p /tmp/sqliteDatabases
${pkgs.sqlite}/bin/sqlite3 ${db} ".backup '/tmp/sqliteDatabases/${builtins.baseNameOf db}.sqlite-backup'"
[ $(du -b /tmp/sqliteDatabases/${builtins.baseNameOf db}.sqlite-backup | cut -f1) -gt "50" ] || exit 1
'') backup.sqliteDatabases + concatMapStringsSep "\n" (db: ''
echo "Dumping influx-bucket: ${db}"
mkdir -p /tmp/influxBuckets
${pkgs.influxdb2}/bin/influx backup --compression=none --bucket=${db} /tmp/influxBuckets/${db}
[ $(du -b /tmp/influxBuckets/${db} | cut -f1) -gt "50" ] || exit 1
'') backup.influxBuckets)
)
];
};
script = ''
set -eu pipefail
export XDG_CACHE_HOME=/var/cache/restic-backup-${name}
'' + concatMapStringsSep "\n\n" (server: ''
echo "Backing up to: ${server}"
export RESTIC_REPOSITORY="rest:https://restic:$(cat /tmp/${server})@restic.${server}/${config.networking.hostName}-${name}"
#create repo if it not exists
restic snapshots || restic init
#backup files
restic backup ${escapeShellArgs (((backup.paths ++ optional (backup.postgresDatabases != []) "/tmp/postgresDatabases") ++ optional (backup.sqliteDatabases != []) "/tmp/sqliteDatabases") ++ optional (backup.influxBuckets != []) "/tmp/influxBuckets") }
restic check
'') backup.targets;
}
) backups;
systemd.timers = mapAttrs' (
name: backup: nameValuePair "restic-backup-${name}" {
wantedBy = [ "timers.target" ];
timerConfig = backup.timerConfig;
}
) backups;
};
}