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dconf.nix
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181 lines (157 loc) · 5.77 KB
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{
config,
lib,
pkgs,
...
}:
let
inherit (lib) types;
cfg = config.dconf;
toDconfIni = lib.generators.toINI { mkKeyValue = mkIniKeyValue; };
mkIniKeyValue = key: value: "${key}=${toString (lib.hm.gvariant.mkValue value)}";
# The dconf keys managed by this configuration. We store this as part of the
# generation state to be able to reset keys that become unmanaged during
# switch.
mkStateDconfKeys =
nameSuffix: settings:
pkgs.writeText "dconf-keys${nameSuffix}.json" (
builtins.toJSON (
lib.concatLists (
lib.mapAttrsToList (dir: entries: lib.mapAttrsToList (key: _: "/${dir}/${key}") entries) settings
)
)
);
databases =
lib.optional (cfg.settings != { }) {
dconfProfile = null;
stateDconfKeys = mkStateDconfKeys "" cfg.settings;
inherit (cfg) settings;
}
++ lib.mapAttrsToList (name: value: {
dconfProfile = pkgs.writeText "dconf-profile-${name}" ''
user-db:${name}
'';
stateDconfKeys = mkStateDconfKeys "-${name}" value;
settings = value;
}) cfg.databases;
in
{
meta.maintainers = [ lib.maintainers.rycee ];
options = {
dconf = {
enable = lib.mkOption {
type = types.bool;
# While technically dconf on darwin could work, our activation step
# requires dbus, which only *lightly* supports Darwin in general, and
# not at all in the way it's packaged in nixpkgs. Because of this, we
# just disable dconf for darwin hosts by default.
# In the future, if someone gets dbus working, this _could_ be
# re-enabled, unclear whether there's actual value in it though.
default = !pkgs.stdenv.hostPlatform.isDarwin;
visible = false;
description = ''
Whether to enable dconf settings.
Note, if you use NixOS then you must add
`programs.dconf.enable = true`
to your system configuration. Otherwise you will see a systemd error
message when your configuration is activated.
'';
};
settings = lib.mkOption {
type = with types; attrsOf (attrsOf lib.hm.types.gvariant);
default = { };
example = lib.literalExpression ''
{
"org/gnome/calculator" = {
button-mode = "programming";
show-thousands = true;
base = 10;
word-size = 64;
window-position = lib.hm.gvariant.mkTuple [100 100];
};
}
'';
description = ''
Settings to write to the dconf configuration system.
Note that the database is strongly-typed so you need to use the same types
as described in the GSettings schema. For example, if an option is of type
`uint32` (`u`), you need to wrap the number
using the `lib.hm.gvariant.mkUint32` constructor.
Otherwise, since Nix integers are implicitly coerced to `int32`
(`i`), it would get stored in the database as such, and GSettings
might be confused when loading the setting.
You might want to use [dconf2nix](https://github.com/gvolpe/dconf2nix)
to convert dconf database dumps into compatible Nix expression.
'';
};
databases = lib.mkOption {
type = with types; attrsOf (attrsOf (attrsOf lib.hm.types.gvariant));
default = { };
description = ''
Settings to write to specific dconf user databases.
See [](#opt-dconf.settings) for details.
'';
};
};
};
config = lib.mkIf (cfg.enable && databases != [ ]) {
# Make sure the dconf directory exists.
xdg.configFile."dconf/.keep".source = builtins.toFile "keep" "";
home.extraBuilderCommands = ''
mkdir -p $out/state/
''
+ lib.concatMapStrings (db: ''
ln -s ${db.stateDconfKeys} $out/state/${db.stateDconfKeys.name}
'') databases;
home.activation.dconfSettings = lib.hm.dag.entryAfter [ "installPackages" ] (
lib.concatMapStrings (
db:
let
iniFile = pkgs.writeText "hm-dconf.ini" (toDconfIni db.settings);
statePath = "state/${db.stateDconfKeys.name}";
cleanup = pkgs.writeShellScript "dconf-cleanup" ''
set -euo pipefail
${config.lib.bash.initHomeManagerLib}
PATH=${
lib.makeBinPath [
pkgs.dconf
pkgs.jq
]
}''${PATH:+:}$PATH
oldState="$1"
newState="$2"
# Can't do cleanup if we don't know the old state.
if [[ ! -f $oldState ]]; then
exit 0
fi
# Reset all keys that are present in the old generation but not the new
# one.
jq -r -n \
--slurpfile old "$oldState" \
--slurpfile new "$newState" \
'($old[] - $new[])[]' \
| while read -r key; do
verboseEcho "Resetting dconf key \"$key\""
run $DCONF_DBUS_RUN_SESSION dconf reset "$key"
done
'';
envCommand = lib.optionalString (db.dconfProfile != null) "env DCONF_PROFILE=${db.dconfProfile}";
in
''
if [[ -v DBUS_SESSION_BUS_ADDRESS ]]; then
export DCONF_DBUS_RUN_SESSION="${envCommand}"
else
export DCONF_DBUS_RUN_SESSION="${pkgs.dbus}/bin/dbus-run-session --dbus-daemon=${pkgs.dbus}/bin/dbus-daemon ${envCommand}"
fi
if [[ -v oldGenPath ]]; then
${cleanup} \
"$oldGenPath/${statePath}" \
"$newGenPath/${statePath}"
fi
run $DCONF_DBUS_RUN_SESSION ${pkgs.dconf}/bin/dconf load / < ${iniFile}
unset DCONF_DBUS_RUN_SESSION
''
) databases
);
};
}