714 lines
26 KiB
Nix
714 lines
26 KiB
Nix
{ config, lib, options, pkgs, ... }:
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with lib;
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let
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cfg = config.services.syncthing;
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opt = options.services.syncthing;
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defaultUser = "syncthing";
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defaultGroup = defaultUser;
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settingsFormat = pkgs.formats.json { };
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cleanedConfig = converge (filterAttrsRecursive (_: v: v != null && v != {})) cfg.settings;
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isUnixGui = (builtins.substring 0 1 cfg.guiAddress) == "/";
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# Syncthing supports serving the GUI over Unix sockets. If that happens, the
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# API is served over the Unix socket as well. This function returns the correct
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# curl arguments for the address portion of the curl command for both network
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# and Unix socket addresses.
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curlAddressArgs = path: if isUnixGui
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# if cfg.guiAddress is a unix socket, tell curl explicitly about it
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# note that the dot in front of `${path}` is the hostname, which is
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# required.
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then "--unix-socket ${cfg.guiAddress} http://.${path}"
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# no adjustements are needed if cfg.guiAddress is a network address
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else "${cfg.guiAddress}${path}"
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;
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devices = mapAttrsToList (_: device: device // {
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deviceID = device.id;
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}) cfg.settings.devices;
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folders = mapAttrsToList (_: folder: folder //
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throwIf (folder?rescanInterval || folder?watch || folder?watchDelay) ''
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The options services.syncthing.settings.folders.<name>.{rescanInterval,watch,watchDelay}
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were removed. Please use, respectively, {rescanIntervalS,fsWatcherEnabled,fsWatcherDelayS} instead.
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'' {
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devices = map (device:
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if builtins.isString device then
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{ deviceId = cfg.settings.devices.${device}.id; }
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else
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device
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) folder.devices;
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}) (filterAttrs (_: folder:
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folder.enable
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) cfg.settings.folders);
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jq = "${pkgs.jq}/bin/jq";
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updateConfig = pkgs.writers.writeBash "merge-syncthing-config" (''
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set -efu
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# be careful not to leak secrets in the filesystem or in process listings
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umask 0077
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curl() {
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# get the api key by parsing the config.xml
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while
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! ${pkgs.libxml2}/bin/xmllint \
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--xpath 'string(configuration/gui/apikey)' \
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${cfg.configDir}/config.xml \
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>"$RUNTIME_DIRECTORY/api_key"
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do sleep 1; done
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(printf "X-API-Key: "; cat "$RUNTIME_DIRECTORY/api_key") >"$RUNTIME_DIRECTORY/headers"
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${pkgs.curl}/bin/curl -sSLk -H "@$RUNTIME_DIRECTORY/headers" \
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--retry 1000 --retry-delay 1 --retry-all-errors \
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"$@"
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}
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'' +
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/* Syncthing's rest API for the folders and devices is almost identical.
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Hence we iterate them using lib.pipe and generate shell commands for both at
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the sime time. */
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(lib.pipe {
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# The attributes below are the only ones that are different for devices /
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# folders.
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devs = {
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new_conf_IDs = map (v: v.id) devices;
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GET_IdAttrName = "deviceID";
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override = cfg.overrideDevices;
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conf = devices;
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baseAddress = curlAddressArgs "/rest/config/devices";
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};
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dirs = {
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new_conf_IDs = map (v: v.id) folders;
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GET_IdAttrName = "id";
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override = cfg.overrideFolders;
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conf = folders;
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baseAddress = curlAddressArgs "/rest/config/folders";
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};
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} [
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# Now for each of these attributes, write the curl commands that are
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# identical to both folders and devices.
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(mapAttrs (conf_type: s:
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# We iterate the `conf` list now, and run a curl -X POST command for each, that
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# should update that device/folder only.
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lib.pipe s.conf [
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# Quoting https://docs.syncthing.net/rest/config.html:
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#
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# > PUT takes an array and POST a single object. In both cases if a
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# given folder/device already exists, it’s replaced, otherwise a new
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# one is added.
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#
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# What's not documented, is that using PUT will remove objects that
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# don't exist in the array given. That's why we use here `POST`, and
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# only if s.override == true then we DELETE the relevant folders
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# afterwards.
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(map (new_cfg: ''
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curl -d ${lib.escapeShellArg (builtins.toJSON new_cfg)} -X POST ${s.baseAddress}
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''))
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(lib.concatStringsSep "\n")
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]
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/* If we need to override devices/folders, we iterate all currently configured
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IDs, via another `curl -X GET`, and we delete all IDs that are not part of
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the Nix configured list of IDs
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*/
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+ lib.optionalString s.override ''
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stale_${conf_type}_ids="$(curl -X GET ${s.baseAddress} | ${jq} \
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--argjson new_ids ${lib.escapeShellArg (builtins.toJSON s.new_conf_IDs)} \
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--raw-output \
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'[.[].${s.GET_IdAttrName}] - $new_ids | .[]'
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)"
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for id in ''${stale_${conf_type}_ids}; do
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curl -X DELETE ${s.baseAddress}/$id
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done
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''
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))
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builtins.attrValues
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(lib.concatStringsSep "\n")
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]) +
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/* Now we update the other settings defined in cleanedConfig which are not
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"folders" or "devices". */
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(lib.pipe cleanedConfig [
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builtins.attrNames
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(lib.subtractLists ["folders" "devices"])
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(map (subOption: ''
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curl -X PUT -d ${lib.escapeShellArg (builtins.toJSON cleanedConfig.${subOption})} ${curlAddressArgs "/rest/config/${subOption}"}
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''))
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(lib.concatStringsSep "\n")
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]) + ''
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# restart Syncthing if required
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if curl ${curlAddressArgs "/rest/config/restart-required"} |
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${jq} -e .requiresRestart > /dev/null; then
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curl -X POST ${curlAddressArgs "/rest/system/restart"}
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fi
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'');
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in {
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###### interface
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options = {
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services.syncthing = {
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enable = mkEnableOption "Syncthing, a self-hosted open-source alternative to Dropbox and Bittorrent Sync";
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cert = mkOption {
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type = types.nullOr types.str;
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default = null;
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description = ''
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Path to the `cert.pem` file, which will be copied into Syncthing's
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[configDir](#opt-services.syncthing.configDir).
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'';
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};
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key = mkOption {
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type = types.nullOr types.str;
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default = null;
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description = ''
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Path to the `key.pem` file, which will be copied into Syncthing's
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[configDir](#opt-services.syncthing.configDir).
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'';
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};
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overrideDevices = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether to delete the devices which are not configured via the
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[devices](#opt-services.syncthing.settings.devices) option.
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If set to `false`, devices added via the web
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interface will persist and will have to be deleted manually.
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'';
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};
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overrideFolders = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether to delete the folders which are not configured via the
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[folders](#opt-services.syncthing.settings.folders) option.
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If set to `false`, folders added via the web
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interface will persist and will have to be deleted manually.
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'';
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};
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settings = mkOption {
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type = types.submodule {
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freeformType = settingsFormat.type;
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options = {
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# global options
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options = mkOption {
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default = {};
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description = ''
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The options element contains all other global configuration options
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'';
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type = types.submodule ({ name, ... }: {
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freeformType = settingsFormat.type;
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options = {
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localAnnounceEnabled = mkOption {
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type = types.nullOr types.bool;
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default = null;
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description = ''
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Whether to send announcements to the local LAN, also use such announcements to find other devices.
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'';
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};
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localAnnouncePort = mkOption {
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type = types.nullOr types.int;
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default = null;
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description = ''
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The port on which to listen and send IPv4 broadcast announcements to.
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'';
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};
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relaysEnabled = mkOption {
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type = types.nullOr types.bool;
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default = null;
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description = ''
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When true, relays will be connected to and potentially used for device to device connections.
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'';
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};
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urAccepted = mkOption {
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type = types.nullOr types.int;
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default = null;
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description = ''
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Whether the user has accepted to submit anonymous usage data.
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The default, 0, mean the user has not made a choice, and Syncthing will ask at some point in the future.
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"-1" means no, a number above zero means that that version of usage reporting has been accepted.
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'';
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};
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limitBandwidthInLan = mkOption {
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type = types.nullOr types.bool;
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default = null;
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description = ''
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Whether to apply bandwidth limits to devices in the same broadcast domain as the local device.
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'';
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};
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maxFolderConcurrency = mkOption {
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type = types.nullOr types.int;
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default = null;
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description = ''
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This option controls how many folders may concurrently be in I/O-intensive operations such as syncing or scanning.
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The mechanism is described in detail in a [separate chapter](https://docs.syncthing.net/advanced/option-max-concurrency.html).
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'';
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};
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};
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});
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};
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# device settings
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devices = mkOption {
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default = {};
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description = ''
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Peers/devices which Syncthing should communicate with.
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Note that you can still add devices manually, but those changes
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will be reverted on restart if [overrideDevices](#opt-services.syncthing.overrideDevices)
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is enabled.
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'';
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example = {
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bigbox = {
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id = "7CFNTQM-IMTJBHJ-3UWRDIU-ZGQJFR6-VCXZ3NB-XUH3KZO-N52ITXR-LAIYUAU";
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addresses = [ "tcp://192.168.0.10:51820" ];
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};
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};
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type = types.attrsOf (types.submodule ({ name, ... }: {
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freeformType = settingsFormat.type;
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options = {
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name = mkOption {
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type = types.str;
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default = name;
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description = ''
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The name of the device.
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'';
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};
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id = mkOption {
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type = types.str;
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description = ''
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The device ID. See <https://docs.syncthing.net/dev/device-ids.html>.
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'';
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};
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autoAcceptFolders = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Automatically create or share folders that this device advertises at the default path.
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See <https://docs.syncthing.net/users/config.html?highlight=autoaccept#config-file-format>.
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'';
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};
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};
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}));
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};
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# folder settings
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folders = mkOption {
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default = {};
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description = ''
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Folders which should be shared by Syncthing.
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Note that you can still add folders manually, but those changes
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will be reverted on restart if [overrideFolders](#opt-services.syncthing.overrideFolders)
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is enabled.
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'';
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example = literalExpression ''
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{
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"/home/user/sync" = {
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id = "syncme";
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devices = [ "bigbox" ];
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};
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}
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'';
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type = types.attrsOf (types.submodule ({ name, ... }: {
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freeformType = settingsFormat.type;
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options = {
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enable = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether to share this folder.
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This option is useful when you want to define all folders
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in one place, but not every machine should share all folders.
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'';
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};
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path = mkOption {
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# TODO for release 23.05: allow relative paths again and set
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# working directory to cfg.dataDir
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type = types.str // {
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check = x: types.str.check x && (substring 0 1 x == "/" || substring 0 2 x == "~/");
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description = types.str.description + " starting with / or ~/";
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};
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default = name;
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description = ''
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The path to the folder which should be shared.
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Only absolute paths (starting with `/`) and paths relative to
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the [user](#opt-services.syncthing.user)'s home directory
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(starting with `~/`) are allowed.
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'';
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};
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id = mkOption {
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type = types.str;
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default = name;
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description = ''
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The ID of the folder. Must be the same on all devices.
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'';
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};
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label = mkOption {
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type = types.str;
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default = name;
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description = ''
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The label of the folder.
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'';
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};
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devices = mkOption {
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type = types.listOf types.str;
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default = [];
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description = ''
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The devices this folder should be shared with. Each device must
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be defined in the [devices](#opt-services.syncthing.settings.devices) option.
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'';
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};
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versioning = mkOption {
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default = null;
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description = ''
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How to keep changed/deleted files with Syncthing.
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There are 4 different types of versioning with different parameters.
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See <https://docs.syncthing.net/users/versioning.html>.
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'';
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example = literalExpression ''
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[
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{
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versioning = {
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type = "simple";
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params.keep = "10";
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};
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}
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{
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versioning = {
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type = "trashcan";
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params.cleanoutDays = "1000";
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};
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}
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{
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versioning = {
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type = "staggered";
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fsPath = "/syncthing/backup";
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params = {
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cleanInterval = "3600";
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maxAge = "31536000";
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};
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};
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}
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{
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versioning = {
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type = "external";
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params.versionsPath = pkgs.writers.writeBash "backup" '''
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folderpath="$1"
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filepath="$2"
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rm -rf "$folderpath/$filepath"
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''';
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};
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}
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]
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'';
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type = with types; nullOr (submodule {
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freeformType = settingsFormat.type;
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options = {
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type = mkOption {
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type = enum [ "external" "simple" "staggered" "trashcan" ];
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description = ''
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The type of versioning.
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See <https://docs.syncthing.net/users/versioning.html>.
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'';
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};
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};
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});
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};
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copyOwnershipFromParent = mkOption {
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type = types.bool;
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default = false;
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description = ''
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On Unix systems, tries to copy file/folder ownership from the parent directory (the directory it’s located in).
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Requires running Syncthing as a privileged user, or granting it additional capabilities (e.g. CAP_CHOWN on Linux).
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'';
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};
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};
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}));
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};
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};
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};
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default = {};
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description = ''
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Extra configuration options for Syncthing.
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See <https://docs.syncthing.net/users/config.html>.
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Note that this attribute set does not exactly match the documented
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xml format. Instead, this is the format of the json rest api. There
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are slight differences. For example, this xml:
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```xml
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<options>
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<listenAddress>default</listenAddress>
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<minHomeDiskFree unit="%">1</minHomeDiskFree>
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</options>
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```
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corresponds to the json:
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```json
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{
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options: {
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listenAddresses = [
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"default"
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];
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minHomeDiskFree = {
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unit = "%";
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value = 1;
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};
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};
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}
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```
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'';
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example = {
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options.localAnnounceEnabled = false;
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gui.theme = "black";
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};
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};
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guiAddress = mkOption {
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type = types.str;
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default = "127.0.0.1:8384";
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description = ''
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The address to serve the web interface at.
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'';
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};
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systemService = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether to auto-launch Syncthing as a system service.
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'';
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};
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user = mkOption {
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type = types.str;
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default = defaultUser;
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example = "yourUser";
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description = ''
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The user to run Syncthing as.
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By default, a user named `${defaultUser}` will be created whose home
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directory is [dataDir](#opt-services.syncthing.dataDir).
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'';
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};
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group = mkOption {
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type = types.str;
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default = defaultGroup;
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example = "yourGroup";
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description = ''
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The group to run Syncthing under.
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By default, a group named `${defaultGroup}` will be created.
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'';
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};
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all_proxy = mkOption {
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type = with types; nullOr str;
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default = null;
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example = "socks5://address.com:1234";
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description = ''
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Overwrites the all_proxy environment variable for the Syncthing process to
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the given value. This is normally used to let Syncthing connect
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through a SOCKS5 proxy server.
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See <https://docs.syncthing.net/users/proxying.html>.
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'';
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};
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dataDir = mkOption {
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type = types.path;
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default = "/var/lib/syncthing";
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example = "/home/yourUser";
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description = ''
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The path where synchronised directories will exist.
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'';
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};
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configDir = let
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cond = versionAtLeast config.system.stateVersion "19.03";
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in mkOption {
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type = types.path;
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description = ''
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The path where the settings and keys will exist.
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'';
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default = cfg.dataDir + optionalString cond "/.config/syncthing";
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defaultText = literalMD ''
|
||
* if `stateVersion >= 19.03`:
|
||
|
||
config.${opt.dataDir} + "/.config/syncthing"
|
||
* otherwise:
|
||
|
||
config.${opt.dataDir}
|
||
'';
|
||
};
|
||
|
||
databaseDir = mkOption {
|
||
type = types.path;
|
||
description = ''
|
||
The directory containing the database and logs.
|
||
'';
|
||
default = cfg.configDir;
|
||
defaultText = literalExpression "config.${opt.configDir}";
|
||
};
|
||
|
||
extraFlags = mkOption {
|
||
type = types.listOf types.str;
|
||
default = [];
|
||
example = [ "--reset-deltas" ];
|
||
description = ''
|
||
Extra flags passed to the syncthing command in the service definition.
|
||
'';
|
||
};
|
||
|
||
openDefaultPorts = mkOption {
|
||
type = types.bool;
|
||
default = false;
|
||
example = true;
|
||
description = ''
|
||
Whether to open the default ports in the firewall: TCP/UDP 22000 for transfers
|
||
and UDP 21027 for discovery.
|
||
|
||
If multiple users are running Syncthing on this machine, you will need
|
||
to manually open a set of ports for each instance and leave this disabled.
|
||
Alternatively, if you are running only a single instance on this machine
|
||
using the default ports, enable this.
|
||
'';
|
||
};
|
||
|
||
package = mkPackageOption pkgs "syncthing" { };
|
||
};
|
||
};
|
||
|
||
imports = [
|
||
(mkRemovedOptionModule [ "services" "syncthing" "useInotify" ] ''
|
||
This option was removed because Syncthing now has the inotify functionality included under the name "fswatcher".
|
||
It can be enabled on a per-folder basis through the web interface.
|
||
'')
|
||
(mkRenamedOptionModule [ "services" "syncthing" "extraOptions" ] [ "services" "syncthing" "settings" ])
|
||
(mkRenamedOptionModule [ "services" "syncthing" "folders" ] [ "services" "syncthing" "settings" "folders" ])
|
||
(mkRenamedOptionModule [ "services" "syncthing" "devices" ] [ "services" "syncthing" "settings" "devices" ])
|
||
(mkRenamedOptionModule [ "services" "syncthing" "options" ] [ "services" "syncthing" "settings" "options" ])
|
||
] ++ map (o:
|
||
mkRenamedOptionModule [ "services" "syncthing" "declarative" o ] [ "services" "syncthing" o ]
|
||
) [ "cert" "key" "devices" "folders" "overrideDevices" "overrideFolders" "extraOptions"];
|
||
|
||
###### implementation
|
||
|
||
config = mkIf cfg.enable {
|
||
|
||
networking.firewall = mkIf cfg.openDefaultPorts {
|
||
allowedTCPPorts = [ 22000 ];
|
||
allowedUDPPorts = [ 21027 22000 ];
|
||
};
|
||
|
||
systemd.packages = [ pkgs.syncthing ];
|
||
|
||
users.users = mkIf (cfg.systemService && cfg.user == defaultUser) {
|
||
${defaultUser} =
|
||
{ group = cfg.group;
|
||
home = cfg.dataDir;
|
||
createHome = true;
|
||
uid = config.ids.uids.syncthing;
|
||
description = "Syncthing daemon user";
|
||
};
|
||
};
|
||
|
||
users.groups = mkIf (cfg.systemService && cfg.group == defaultGroup) {
|
||
${defaultGroup}.gid =
|
||
config.ids.gids.syncthing;
|
||
};
|
||
|
||
systemd.services = {
|
||
# upstream reference:
|
||
# https://github.com/syncthing/syncthing/blob/main/etc/linux-systemd/system/syncthing%40.service
|
||
syncthing = mkIf cfg.systemService {
|
||
description = "Syncthing service";
|
||
after = [ "network.target" ];
|
||
environment = {
|
||
STNORESTART = "yes";
|
||
STNOUPGRADE = "yes";
|
||
inherit (cfg) all_proxy;
|
||
} // config.networking.proxy.envVars;
|
||
wantedBy = [ "multi-user.target" ];
|
||
serviceConfig = {
|
||
Restart = "on-failure";
|
||
SuccessExitStatus = "3 4";
|
||
RestartForceExitStatus="3 4";
|
||
User = cfg.user;
|
||
Group = cfg.group;
|
||
ExecStartPre = mkIf (cfg.cert != null || cfg.key != null)
|
||
"+${pkgs.writers.writeBash "syncthing-copy-keys" ''
|
||
install -dm700 -o ${cfg.user} -g ${cfg.group} ${cfg.configDir}
|
||
${optionalString (cfg.cert != null) ''
|
||
install -Dm400 -o ${cfg.user} -g ${cfg.group} ${toString cfg.cert} ${cfg.configDir}/cert.pem
|
||
''}
|
||
${optionalString (cfg.key != null) ''
|
||
install -Dm400 -o ${cfg.user} -g ${cfg.group} ${toString cfg.key} ${cfg.configDir}/key.pem
|
||
''}
|
||
''}"
|
||
;
|
||
ExecStart = ''
|
||
${cfg.package}/bin/syncthing \
|
||
-no-browser \
|
||
-gui-address=${if isUnixGui then "unix://" else ""}${cfg.guiAddress} \
|
||
-config=${cfg.configDir} \
|
||
-data=${cfg.databaseDir} \
|
||
${escapeShellArgs cfg.extraFlags}
|
||
'';
|
||
MemoryDenyWriteExecute = true;
|
||
NoNewPrivileges = true;
|
||
PrivateDevices = true;
|
||
PrivateMounts = true;
|
||
PrivateTmp = true;
|
||
PrivateUsers = true;
|
||
ProtectControlGroups = true;
|
||
ProtectHostname = true;
|
||
ProtectKernelModules = true;
|
||
ProtectKernelTunables = true;
|
||
RestrictNamespaces = true;
|
||
RestrictRealtime = true;
|
||
RestrictSUIDSGID = true;
|
||
CapabilityBoundingSet = [
|
||
"~CAP_SYS_PTRACE" "~CAP_SYS_ADMIN"
|
||
"~CAP_SETGID" "~CAP_SETUID" "~CAP_SETPCAP"
|
||
"~CAP_SYS_TIME" "~CAP_KILL"
|
||
];
|
||
};
|
||
};
|
||
syncthing-init = mkIf (cleanedConfig != {}) {
|
||
description = "Syncthing configuration updater";
|
||
requisite = [ "syncthing.service" ];
|
||
after = [ "syncthing.service" ];
|
||
wantedBy = [ "multi-user.target" ];
|
||
|
||
serviceConfig = {
|
||
User = cfg.user;
|
||
RemainAfterExit = true;
|
||
RuntimeDirectory = "syncthing-init";
|
||
Type = "oneshot";
|
||
ExecStart = updateConfig;
|
||
};
|
||
};
|
||
|
||
syncthing-resume = {
|
||
wantedBy = [ "suspend.target" ];
|
||
};
|
||
};
|
||
};
|
||
}
|