core/pkgs/pkgs-lib/formats.nix

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{ lib, pkgs }:
rec {
/*
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Every following entry represents a format for program configuration files
used for `settings`-style options (see https://github.com/NixOS/rfcs/pull/42).
Each entry should look as follows:
<format> = <parameters>: {
# ^^ Parameters for controlling the format
# The module system type most suitable for representing such a format
# The description needs to be overwritten for recursive types
type = ...;
# Utility functions for convenience, or special interactions with the
# format (optional)
lib = {
exampleFunction = ...
# Types specific to the format (optional)
types = { ... };
...
};
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# generate :: Name -> Value -> Path
# A function for generating a file with a value of such a type
generate = ...;
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});
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Please note that `pkgs` may not always be available for use due to the split
options doc build introduced in fc614c37c653, so lazy evaluation of only the
'type' field is required.
*/
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inherit (import ./formats/java-properties/default.nix { inherit lib pkgs; }) javaProperties;
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libconfig = (import ./formats/libconfig/default.nix { inherit lib pkgs; }).format;
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hocon = (import ./formats/hocon/default.nix { inherit lib pkgs; }).format;
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json =
{ }:
{
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type =
with lib.types;
let
valueType =
nullOr (oneOf [
bool
int
float
str
path
(attrsOf valueType)
(listOf valueType)
])
// {
description = "JSON value";
};
in
valueType;
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generate =
name: value:
pkgs.callPackage (
{ runCommand, jq }:
runCommand name
{
nativeBuildInputs = [ jq ];
value = builtins.toJSON value;
passAsFile = [ "value" ];
}
''
jq . "$valuePath"> $out
''
) { };
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};
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yaml =
{ }:
{
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generate =
name: value:
pkgs.callPackage (
{ runCommand, remarshal }:
runCommand name
{
nativeBuildInputs = [ remarshal ];
value = builtins.toJSON value;
passAsFile = [ "value" ];
}
''
json2yaml "$valuePath" "$out"
''
) { };
type =
with lib.types;
let
valueType =
nullOr (oneOf [
bool
int
float
str
path
(attrsOf valueType)
(listOf valueType)
])
// {
description = "YAML value";
};
in
valueType;
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};
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# the ini formats share a lot of code
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inherit
(
let
singleIniAtom =
with lib.types;
nullOr (oneOf [
bool
int
float
str
])
// {
description = "INI atom (null, bool, int, float or string)";
};
iniAtom =
with lib.types;
{ listsAsDuplicateKeys, listToValue }:
if listsAsDuplicateKeys then
coercedTo singleIniAtom lib.singleton (listOf singleIniAtom)
// {
description = singleIniAtom.description + " or a list of them for duplicate keys";
}
else if listToValue != null then
coercedTo singleIniAtom lib.singleton (nonEmptyListOf singleIniAtom)
// {
description = singleIniAtom.description + " or a non-empty list of them";
}
else
singleIniAtom;
iniSection =
with lib.types;
{ listsAsDuplicateKeys, listToValue }@args:
attrsOf (iniAtom args)
// {
description = "section of an INI file (attrs of " + (iniAtom args).description + ")";
};
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maybeToList =
listToValue:
if listToValue != null then
lib.mapAttrs (key: val: if lib.isList val then listToValue val else val)
else
lib.id;
in
{
ini =
{
# Represents lists as duplicate keys
listsAsDuplicateKeys ? false,
# Alternative to listsAsDuplicateKeys, converts list to non-list
# listToValue :: [IniAtom] -> IniAtom
listToValue ? null,
...
}@args:
assert listsAsDuplicateKeys -> listToValue == null;
{
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type = lib.types.attrsOf (iniSection {
listsAsDuplicateKeys = listsAsDuplicateKeys;
listToValue = listToValue;
});
generate =
name: value:
lib.pipe value [
(lib.mapAttrs (_: maybeToList listToValue))
(lib.generators.toINI (removeAttrs args [ "listToValue" ]))
(pkgs.writeText name)
];
};
iniWithGlobalSection =
{
# Represents lists as duplicate keys
listsAsDuplicateKeys ? false,
# Alternative to listsAsDuplicateKeys, converts list to non-list
# listToValue :: [IniAtom] -> IniAtom
listToValue ? null,
...
}@args:
assert listsAsDuplicateKeys -> listToValue == null;
{
type = lib.types.submodule {
options = {
sections = lib.mkOption rec {
type = lib.types.attrsOf (iniSection {
listsAsDuplicateKeys = listsAsDuplicateKeys;
listToValue = listToValue;
});
default = { };
description = type.description;
};
globalSection = lib.mkOption rec {
type = iniSection {
listsAsDuplicateKeys = listsAsDuplicateKeys;
listToValue = listToValue;
};
default = { };
description = "global " + type.description;
};
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};
};
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generate =
name:
{
sections ? { },
globalSection ? { },
...
}:
pkgs.writeText name (
lib.generators.toINIWithGlobalSection (removeAttrs args [ "listToValue" ]) {
globalSection = maybeToList listToValue globalSection;
sections = lib.mapAttrs (_: maybeToList listToValue) sections;
}
);
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};
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gitIni =
{
listsAsDuplicateKeys ? false,
...
}@args:
{
type =
let
atom = iniAtom {
listsAsDuplicateKeys = listsAsDuplicateKeys;
listToValue = null;
};
in
with lib.types;
attrsOf (attrsOf (either atom (attrsOf atom)));
generate = name: value: pkgs.writeText name (lib.generators.toGitINI value);
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};
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}
)
ini
iniWithGlobalSection
gitIni
;
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# As defined by systemd.syntax(7)
#
# null does not set any value, which allows for RFC42 modules to specify
# optional config options.
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systemd =
let
mkValueString = lib.generators.mkValueStringDefault { };
mkKeyValue = k: v: if v == null then "# ${k} is unset" else "${k} = ${mkValueString v}";
in
ini {
listsAsDuplicateKeys = true;
inherit mkKeyValue;
};
keyValue =
{
# Represents lists as duplicate keys
listsAsDuplicateKeys ? false,
# Alternative to listsAsDuplicateKeys, converts list to non-list
# listToValue :: [Atom] -> Atom
listToValue ? null,
...
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}@args:
assert listsAsDuplicateKeys -> listToValue == null;
{
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type =
with lib.types;
let
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singleAtom =
nullOr (oneOf [
bool
int
float
str
])
// {
description = "atom (null, bool, int, float or string)";
};
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atom =
if listsAsDuplicateKeys then
coercedTo singleAtom lib.singleton (listOf singleAtom)
// {
description = singleAtom.description + " or a list of them for duplicate keys";
}
else if listToValue != null then
coercedTo singleAtom lib.singleton (nonEmptyListOf singleAtom)
// {
description = singleAtom.description + " or a non-empty list of them";
}
else
singleAtom;
in
attrsOf atom;
generate =
name: value:
let
transformedValue =
if listToValue != null then
lib.mapAttrs (key: val: if lib.isList val then listToValue val else val) value
else
value;
in
pkgs.writeText name (
lib.generators.toKeyValue (removeAttrs args [ "listToValue" ]) transformedValue
);
};
toml =
{ }:
json { }
// {
type =
with lib.types;
let
valueType =
oneOf [
bool
int
float
str
path
(attrsOf valueType)
(listOf valueType)
]
// {
description = "TOML value";
};
in
valueType;
generate =
name: value:
pkgs.callPackage (
{ runCommand, remarshal }:
runCommand name
{
nativeBuildInputs = [ remarshal ];
value = builtins.toJSON value;
passAsFile = [ "value" ];
}
''
json2toml "$valuePath" "$out"
''
) { };
};
/*
For configurations of Elixir project, like config.exs or runtime.exs
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Most Elixir project are configured using the [Config] Elixir DSL
Since Elixir has more types than Nix, we need a way to map Nix types to
more than 1 Elixir type. To that end, this format provides its own library,
and its own set of types.
To be more detailed, a Nix attribute set could correspond in Elixir to a
[Keyword list] (the more common type), or it could correspond to a [Map].
A Nix string could correspond in Elixir to a [String] (also called
"binary"), an [Atom], or a list of chars (usually discouraged).
A Nix array could correspond in Elixir to a [List] or a [Tuple].
Some more types exists, like records, regexes, but since they are less used,
we can leave the `mkRaw` function as an escape hatch.
For more information on how to use this format in modules, please refer to
the Elixir section of the Nixos documentation.
TODO: special Elixir values doesn't show up nicely in the documentation
[Config]: <https://hexdocs.pm/elixir/Config.html>
[Keyword list]: <https://hexdocs.pm/elixir/Keyword.html>
[Map]: <https://hexdocs.pm/elixir/Map.html>
[String]: <https://hexdocs.pm/elixir/String.html>
[Atom]: <https://hexdocs.pm/elixir/Atom.html>
[List]: <https://hexdocs.pm/elixir/List.html>
[Tuple]: <https://hexdocs.pm/elixir/Tuple.html>
*/
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elixirConf =
{
elixir ? pkgs.elixir,
}:
with lib;
let
toElixir =
value:
with builtins;
if value == null then
"nil"
else if value == true then
"true"
else if value == false then
"false"
else if isInt value || isFloat value then
toString value
else if isString value then
string value
else if isAttrs value then
attrs value
else if isList value then
list value
else
abort "formats.elixirConf: should never happen (value = ${value})";
escapeElixir = escape [
"\\"
"#"
"\""
];
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string = value: "\"${escapeElixir value}\"";
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attrs =
set:
if set ? _elixirType then
specialType set
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else
let
toKeyword = name: value: "${name}: ${toElixir value}";
keywordList = concatStringsSep ", " (mapAttrsToList toKeyword set);
in
"[" + keywordList + "]";
listContent = values: concatStringsSep ", " (map toElixir values);
list = values: "[" + (listContent values) + "]";
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specialType =
{ value, _elixirType }:
if _elixirType == "raw" then
value
else if _elixirType == "atom" then
value
else if _elixirType == "map" then
elixirMap value
else if _elixirType == "tuple" then
tuple value
else
abort "formats.elixirConf: should never happen (_elixirType = ${_elixirType})";
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elixirMap =
set:
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let
toEntry = name: value: "${toElixir name} => ${toElixir value}";
entries = concatStringsSep ", " (mapAttrsToList toEntry set);
in
"%{${entries}}";
tuple = values: "{${listContent values}}";
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toConf =
values:
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let
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keyConfig =
rootKey: key: value:
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"config ${rootKey}, ${key}, ${toElixir value}";
keyConfigs = rootKey: values: mapAttrsToList (keyConfig rootKey) values;
rootConfigs = flatten (mapAttrsToList keyConfigs values);
in
''
import Config
${concatStringsSep "\n" rootConfigs}
'';
in
{
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type =
with lib.types;
let
valueType =
nullOr (oneOf [
bool
int
float
str
(attrsOf valueType)
(listOf valueType)
])
// {
description = "Elixir value";
};
in
attrsOf (attrsOf (valueType));
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lib =
let
mkRaw = value: {
inherit value;
_elixirType = "raw";
};
in
{
inherit mkRaw;
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# Fetch an environment variable at runtime, with optional fallback
mkGetEnv =
{
envVariable,
fallback ? null,
}:
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mkRaw "System.get_env(${toElixir envVariable}, ${toElixir fallback})";
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/*
Make an Elixir atom.
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Note: lowercase atoms still need to be prefixed by ':'
*/
mkAtom = value: {
inherit value;
_elixirType = "atom";
};
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# Make an Elixir tuple out of a list.
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mkTuple = value: {
inherit value;
_elixirType = "tuple";
};
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# Make an Elixir map out of an attribute set.
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mkMap = value: {
inherit value;
_elixirType = "map";
};
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/*
Contains Elixir types. Every type it exports can also be replaced
by raw Elixir code (i.e. every type is `either type rawElixir`).
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It also reexports standard types, wrapping them so that they can
also be raw Elixir.
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*/
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types =
with lib.types;
let
isElixirType = type: x: (x._elixirType or "") == type;
rawElixir = mkOptionType {
name = "rawElixir";
description = "raw elixir";
check = isElixirType "raw";
};
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elixirOr = other: either other rawElixir;
in
{
inherit rawElixir elixirOr;
atom = elixirOr (mkOptionType {
name = "elixirAtom";
description = "elixir atom";
check = isElixirType "atom";
});
tuple = elixirOr (mkOptionType {
name = "elixirTuple";
description = "elixir tuple";
check = isElixirType "tuple";
});
map = elixirOr (mkOptionType {
name = "elixirMap";
description = "elixir map";
check = isElixirType "map";
});
# Wrap standard types, since anything in the Elixir configuration
# can be raw Elixir
}
// lib.mapAttrs (_name: type: elixirOr type) lib.types;
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};
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generate =
name: value:
pkgs.runCommand name
{
value = toConf value;
passAsFile = [ "value" ];
nativeBuildInputs = [ elixir ];
}
''
cp "$valuePath" "$out"
mix format "$out"
'';
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};
# Outputs a succession of Python variable assignments
# Useful for many Django-based services
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pythonVars =
{ }:
{
type =
with lib.types;
let
valueType =
nullOr (oneOf [
bool
float
int
path
str
(attrsOf valueType)
(listOf valueType)
])
// {
description = "Python value";
};
in
attrsOf valueType;
generate =
name: value:
pkgs.callPackage (
{
runCommand,
python3,
black,
}:
runCommand name
{
nativeBuildInputs = [
python3
black
];
value = builtins.toJSON value;
pythonGen = ''
import json
import os
with open(os.environ["valuePath"], "r") as f:
for key, value in json.load(f).items():
print(f"{key} = {repr(value)}")
'';
passAsFile = [
"value"
"pythonGen"
];
}
''
cat "$valuePath"
python3 "$pythonGenPath" > $out
black $out
''
) { };
};
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}