136 lines
4.5 KiB
Nix
136 lines
4.5 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.dconf;
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toDconfIni = generators.toINI { mkKeyValue = mkIniKeyValue; };
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mkIniKeyValue = key: value: "${key}=${toString (hm.gvariant.mkValue value)}";
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# The dconf keys managed by this configuration. We store this as part of the
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# generation state to be able to reset keys that become unmanaged during
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# switch.
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stateDconfKeys = pkgs.writeText "dconf-keys.json" (builtins.toJSON
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(concatLists (mapAttrsToList
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(dir: entries: mapAttrsToList (key: _: "/${dir}/${key}") entries)
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cfg.settings)));
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in {
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meta.maintainers = [ maintainers.rycee ];
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options = {
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dconf = {
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enable = mkOption {
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type = types.bool;
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# While technically dconf on darwin could work, our activation step
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# requires dbus, which only *lightly* supports Darwin in general, and
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# not at all in the way it's packaged in nixpkgs. Because of this, we
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# just disable dconf for darwin hosts by default.
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# In the future, if someone gets dbus working, this _could_ be
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# re-enabled, unclear whether there's actual value in it though.
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default = !pkgs.stdenv.hostPlatform.isDarwin;
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visible = false;
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description = ''
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Whether to enable dconf settings.
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Note, if you use NixOS then you must add
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`programs.dconf.enable = true`
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to your system configuration. Otherwise you will see a systemd error
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message when your configuration is activated.
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'';
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};
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settings = mkOption {
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type = with types; attrsOf (attrsOf hm.types.gvariant);
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default = { };
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example = literalExpression ''
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{
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"org/gnome/calculator" = {
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button-mode = "programming";
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show-thousands = true;
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base = 10;
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word-size = 64;
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window-position = lib.hm.gvariant.mkTuple [100 100];
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};
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}
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'';
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description = ''
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Settings to write to the dconf configuration system.
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Note that the database is strongly-typed so you need to use the same types
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as described in the GSettings schema. For example, if an option is of type
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`uint32` (`u`), you need to wrap the number
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using the `lib.hm.gvariant.mkUint32` constructor.
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Otherwise, since Nix integers are implicitly coerced to `int32`
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(`i`), it would get stored in the database as such, and GSettings
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might be confused when loading the setting.
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You might want to use [dconf2nix](https://github.com/gvolpe/dconf2nix)
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to convert dconf database dumps into compatible Nix expression.
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'';
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};
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};
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};
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config = mkIf (cfg.enable && cfg.settings != { }) {
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# Make sure the dconf directory exists.
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xdg.configFile."dconf/.keep".source = builtins.toFile "keep" "";
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home.extraBuilderCommands = ''
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mkdir -p $out/state/
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ln -s ${stateDconfKeys} $out/state/${stateDconfKeys.name}
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'';
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home.activation.dconfSettings = hm.dag.entryAfter [ "installPackages" ] (let
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iniFile = pkgs.writeText "hm-dconf.ini" (toDconfIni cfg.settings);
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statePath = "state/${stateDconfKeys.name}";
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cleanup = pkgs.writeShellScript "dconf-cleanup" ''
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set -euo pipefail
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${config.lib.bash.initHomeManagerLib}
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PATH=${makeBinPath [ pkgs.dconf pkgs.jq ]}''${PATH:+:}$PATH
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oldState="$1"
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newState="$2"
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# Can't do cleanup if we don't know the old state.
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if [[ ! -f $oldState ]]; then
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exit 0
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fi
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# Reset all keys that are present in the old generation but not the new
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# one.
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jq -r -n \
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--slurpfile old "$oldState" \
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--slurpfile new "$newState" \
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'($old[] - $new[])[]' \
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| while read -r key; do
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verboseEcho "Resetting dconf key \"$key\""
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run $DCONF_DBUS_RUN_SESSION dconf reset "$key"
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done
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'';
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in ''
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if [[ -v DBUS_SESSION_BUS_ADDRESS ]]; then
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export DCONF_DBUS_RUN_SESSION=""
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else
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export DCONF_DBUS_RUN_SESSION="${pkgs.dbus}/bin/dbus-run-session --dbus-daemon=${pkgs.dbus}/bin/dbus-daemon"
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fi
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if [[ -v oldGenPath ]]; then
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${cleanup} \
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"$oldGenPath/${statePath}" \
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"$newGenPath/${statePath}"
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fi
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run $DCONF_DBUS_RUN_SESSION ${pkgs.dconf}/bin/dconf load / < ${iniFile}
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unset DCONF_DBUS_RUN_SESSION
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'');
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};
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}
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