145 lines
5.0 KiB
Nix
145 lines
5.0 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.transmission;
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apparmor = config.security.apparmor.enable;
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homeDir = "/var/lib/transmission";
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downloadDir = "${homeDir}/Downloads";
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incompleteDir = "${homeDir}/.incomplete";
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settingsDir = "${homeDir}/.config/transmission-daemon";
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settingsFile = pkgs.writeText "settings.json" (builtins.toJSON fullSettings);
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# Strings must be quoted, ints and bools must not (for settings.json).
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toOption = x:
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if x == true then "true"
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else if x == false then "false"
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else if isInt x then toString x
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else toString ''"${x}"'';
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# for users in group "transmission" to have access to torrents
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fullSettings = cfg.settings // { umask = 2; };
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in
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{
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options = {
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services.transmission = {
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enable = mkOption {
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type = types.uniq types.bool;
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default = false;
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description = ''
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Whether or not to enable the headless Transmission BitTorrent daemon.
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Transmission daemon can be controlled via the RPC interface using
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transmission-remote or the WebUI (http://localhost:9091/ by default).
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Torrents are downloaded to ${homeDir}/Downloads/ by default and are
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accessible to users in the "transmission" group.
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'';
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};
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settings = mkOption {
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type = types.attrs;
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default =
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{
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download-dir = downloadDir;
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incomplete-dir = incompleteDir;
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incomplete-dir-enabled = true;
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};
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example =
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{
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download-dir = "/srv/torrents/";
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incomplete-dir = "/srv/torrents/.incomplete/";
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incomplete-dir-enabled = true;
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rpc-whitelist = "127.0.0.1,192.168.*.*";
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};
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description = ''
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Attribute set whos fields overwrites fields in settings.json (each
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time the service starts). String values must be quoted, integer and
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boolean values must not.
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See https://trac.transmissionbt.com/wiki/EditConfigFiles for
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documentation.
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'';
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};
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port = mkOption {
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type = types.uniq types.int;
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default = 9091;
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description = "TCP port number to run the RPC/web interface.";
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};
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};
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};
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config = mkIf cfg.enable {
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systemd.services.transmission = {
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description = "Transmission BitTorrent Service";
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after = [ "local-fs.target" "network.target" ] ++ optional apparmor "apparmor.service";
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requires = mkIf apparmor [ "apparmor.service" ];
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wantedBy = [ "multi-user.target" ];
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# 1) Only the "transmission" user and group have access to torrents.
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# 2) Optionally update/force specific fields into the configuration file.
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serviceConfig.ExecStartPre = ''
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${pkgs.stdenv.shell} -c "chmod 770 ${homeDir} && mkdir -p ${settingsDir} ${downloadDir} ${incompleteDir} && rm -f ${settingsDir}/settings.json && cp -f ${settingsFile} ${settingsDir}/settings.json"
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'';
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serviceConfig.ExecStart = "${pkgs.transmission}/bin/transmission-daemon -f --port ${toString config.services.transmission.port}";
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serviceConfig.ExecReload = "${pkgs.coreutils}/bin/kill -HUP $MAINPID";
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serviceConfig.User = "transmission";
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# NOTE: transmission has an internal umask that also must be set (in settings.json)
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serviceConfig.UMask = "0002";
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};
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# It's useful to have transmission in path, e.g. for remote control
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environment.systemPackages = [ pkgs.transmission ];
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users.extraGroups.transmission.gid = config.ids.gids.transmission;
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users.extraUsers.transmission = {
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group = "transmission";
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uid = config.ids.uids.transmission;
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description = "Transmission BitTorrent user";
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home = homeDir;
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createHome = true;
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};
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# AppArmor profile
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security.apparmor.profiles = mkIf apparmor [
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(pkgs.writeText "apparmor-transmission-daemon" ''
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#include <tunables/global>
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${pkgs.transmission}/bin/transmission-daemon {
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#include <abstractions/base>
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#include <abstractions/nameservice>
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${pkgs.glibc}/lib/*.so mr,
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${pkgs.libevent}/lib/libevent*.so* mr,
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${pkgs.curl}/lib/libcurl*.so* mr,
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${pkgs.openssl}/lib/libssl*.so* mr,
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${pkgs.openssl}/lib/libcrypto*.so* mr,
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${pkgs.zlib}/lib/libz*.so* mr,
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${pkgs.libssh2}/lib/libssh2*.so* mr,
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${pkgs.systemd}/lib/libsystemd*.so* mr,
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${pkgs.xz}/lib/liblzma*.so* mr,
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${pkgs.libgcrypt}/lib/libgcrypt*.so* mr,
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${pkgs.libgpgerror}/lib/libgpg-error*.so* mr,
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@{PROC}/sys/kernel/random/uuid r,
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@{PROC}/sys/vm/overcommit_memory r,
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${pkgs.transmission}/share/transmission/** r,
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owner ${settingsDir}/** rw,
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${fullSettings.download-dir}/** rw,
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${optionalString fullSettings.incomplete-dir-enabled ''
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${fullSettings.incomplete-dir}/** rw,
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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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