254 lines
8.0 KiB
Nix
254 lines
8.0 KiB
Nix
{ config, lib, pkgs, ... }:
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# openafsMod, openafsBin, mkCellServDB
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with import ./lib.nix { inherit config lib pkgs; };
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let
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inherit (lib) getBin mkOption mkIf optionalString singleton types;
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cfg = config.services.openafsClient;
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cellServDB = pkgs.fetchurl {
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url = "http://dl.central.org/dl/cellservdb/CellServDB.2018-05-14";
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sha256 = "1wmjn6mmyy2r8p10nlbdzs4nrqxy8a9pjyrdciy5nmppg4053rk2";
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};
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clientServDB = pkgs.writeText "client-cellServDB-${cfg.cellName}" (mkCellServDB cfg.cellName cfg.cellServDB);
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afsConfig = pkgs.runCommand "afsconfig" { preferLocalBuild = true; } ''
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mkdir -p $out
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echo ${cfg.cellName} > $out/ThisCell
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cat ${cellServDB} ${clientServDB} > $out/CellServDB
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echo "${cfg.mountPoint}:${cfg.cache.directory}:${toString cfg.cache.blocks}" > $out/cacheinfo
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'';
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in
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{
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###### interface
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options = {
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services.openafsClient = {
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enable = mkOption {
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default = false;
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type = types.bool;
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description = "Whether to enable the OpenAFS client.";
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};
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afsdb = mkOption {
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default = true;
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type = types.bool;
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description = "Resolve cells via AFSDB DNS records.";
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};
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cellName = mkOption {
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default = "";
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type = types.str;
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description = "Cell name.";
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example = "grand.central.org";
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};
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cellServDB = mkOption {
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default = [];
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type = with types; listOf (submodule { options = cellServDBConfig; });
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description = ''
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This cell's database server records, added to the global
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CellServDB. See CellServDB(5) man page for syntax. Ignored when
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<literal>afsdb</literal> is set to <literal>true</literal>.
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'';
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example = ''
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[ { ip = "1.2.3.4"; dnsname = "first.afsdb.server.dns.fqdn.org"; }
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{ ip = "2.3.4.5"; dnsname = "second.afsdb.server.dns.fqdn.org"; }
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]
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'';
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};
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cache = {
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blocks = mkOption {
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default = 100000;
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type = types.int;
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description = "Cache size in 1KB blocks.";
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};
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chunksize = mkOption {
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default = 0;
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type = types.ints.between 0 30;
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description = ''
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Size of each cache chunk given in powers of
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2. <literal>0</literal> resets the chunk size to its default
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values (13 (8 KB) for memcache, 18-20 (256 KB to 1 MB) for
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diskcache). Maximum value is 30. Important performance
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parameter. Set to higher values when dealing with large files.
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'';
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};
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directory = mkOption {
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default = "/var/cache/openafs";
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type = types.str;
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description = "Cache directory.";
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};
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diskless = mkOption {
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default = false;
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type = types.bool;
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description = ''
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Use in-memory cache for diskless machines. Has no real
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performance benefit anymore.
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'';
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};
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};
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crypt = mkOption {
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default = true;
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type = types.bool;
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description = "Whether to enable (weak) protocol encryption.";
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};
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daemons = mkOption {
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default = 2;
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type = types.int;
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description = ''
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Number of daemons to serve user requests. Numbers higher than 6
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usually do no increase performance. Default is sufficient for up
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to five concurrent users.
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'';
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};
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fakestat = mkOption {
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default = false;
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type = types.bool;
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description = ''
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Return fake data on stat() calls. If <literal>true</literal>,
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always do so. If <literal>false</literal>, only do so for
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cross-cell mounts (as these are potentially expensive).
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'';
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};
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inumcalc = mkOption {
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default = "compat";
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type = types.strMatching "compat|md5";
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description = ''
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Inode calculation method. <literal>compat</literal> is
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computationally less expensive, but <literal>md5</literal> greatly
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reduces the likelihood of inode collisions in larger scenarios
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involving multiple cells mounted into one AFS space.
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'';
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};
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mountPoint = mkOption {
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default = "/afs";
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type = types.str;
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description = ''
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Mountpoint of the AFS file tree, conventionally
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<literal>/afs</literal>. When set to a different value, only
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cross-cells that use the same value can be accessed.
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'';
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};
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packages = {
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module = mkOption {
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default = config.boot.kernelPackages.openafs;
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defaultText = "config.boot.kernelPackages.openafs";
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type = types.package;
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description = "OpenAFS kernel module package. MUST match the userland package!";
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};
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programs = mkOption {
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default = getBin pkgs.openafs;
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defaultText = "getBin pkgs.openafs";
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type = types.package;
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description = "OpenAFS programs package. MUST match the kernel module package!";
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};
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};
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sparse = mkOption {
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default = true;
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type = types.bool;
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description = "Minimal cell list in /afs.";
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};
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startDisconnected = mkOption {
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default = false;
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type = types.bool;
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description = ''
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Start up in disconnected mode. You need to execute
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<literal>fs disco online</literal> (as root) to switch to
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connected mode. Useful for roaming devices.
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'';
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};
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};
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};
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###### implementation
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config = mkIf cfg.enable {
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assertions = [
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{ assertion = cfg.afsdb || cfg.cellServDB != [];
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message = "You should specify all cell-local database servers in config.services.openafsClient.cellServDB or set config.services.openafsClient.afsdb.";
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}
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{ assertion = cfg.cellName != "";
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message = "You must specify the local cell name in config.services.openafsClient.cellName.";
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}
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];
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environment.systemPackages = [ openafsBin ];
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environment.etc = {
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clientCellServDB = {
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source = pkgs.runCommand "CellServDB" { preferLocalBuild = true; } ''
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cat ${cellServDB} ${clientServDB} > $out
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'';
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target = "openafs/CellServDB";
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mode = "0644";
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};
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clientCell = {
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text = ''
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${cfg.cellName}
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'';
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target = "openafs/ThisCell";
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mode = "0644";
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};
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};
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systemd.services.afsd = {
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description = "AFS client";
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wantedBy = [ "multi-user.target" ];
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after = singleton (if cfg.startDisconnected then "network.target" else "network-online.target");
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serviceConfig = { RemainAfterExit = true; };
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restartIfChanged = false;
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preStart = ''
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mkdir -p -m 0755 ${cfg.mountPoint}
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mkdir -m 0700 -p ${cfg.cache.directory}
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${pkgs.kmod}/bin/insmod ${openafsMod}/lib/modules/*/extra/openafs/libafs.ko.xz
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${openafsBin}/sbin/afsd \
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-mountdir ${cfg.mountPoint} \
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-confdir ${afsConfig} \
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${optionalString (!cfg.cache.diskless) "-cachedir ${cfg.cache.directory}"} \
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-blocks ${toString cfg.cache.blocks} \
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-chunksize ${toString cfg.cache.chunksize} \
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${optionalString cfg.cache.diskless "-memcache"} \
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-inumcalc ${cfg.inumcalc} \
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${if cfg.fakestat then "-fakestat-all" else "-fakestat"} \
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${if cfg.sparse then "-dynroot-sparse" else "-dynroot"} \
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${optionalString cfg.afsdb "-afsdb"}
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${openafsBin}/bin/fs setcrypt ${if cfg.crypt then "on" else "off"}
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${optionalString cfg.startDisconnected "${openafsBin}/bin/fs discon offline"}
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'';
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# Doing this in preStop, because after these commands AFS is basically
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# stopped, so systemd has nothing to do, just noticing it. If done in
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# postStop, then we get a hang + kernel oops, because AFS can't be
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# stopped simply by sending signals to processes.
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preStop = ''
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${pkgs.utillinux}/bin/umount ${cfg.mountPoint}
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${openafsBin}/sbin/afsd -shutdown
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${pkgs.kmod}/sbin/rmmod libafs
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'';
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};
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};
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}
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