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Show correct position info for errors in submodules

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E.g.

  The unique option `fileSystems./.device' is defined multiple times, in `/etc/nixos/configuration.nix' and `/etc/nixos/foo.nix'.

This requires passing file/value tuples to the merge functions.
This commit is contained in:
Eelco Dolstra 2013-10-30 14:21:41 +01:00
parent 4680af6a93
commit 800f9c2037
6 changed files with 88 additions and 93 deletions
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19
lib/modules.nix
View File

@ -17,7 +17,7 @@ rec {
# Traverse options and extract the option values into the final
# config set. At the same time, check whether all option
# definitions have matching declarations.
config = yieldConfig [] options;
config = yieldConfig prefix options;
yieldConfig = prefix: set:
let res = removeAttrs (mapAttrs (n: v:
if isOption v then v.value
@ -52,22 +52,22 @@ rec {
of ‘options’, ‘config’ and ‘imports’ attributes. */
unifyModuleSyntax = file: key: m:
if m ? config || m ? options then
let badAttrs = removeAttrs m ["imports" "options" "config" "key"]; in
let badAttrs = removeAttrs m ["imports" "options" "config" "key" "_file"]; in
if badAttrs != {} then
throw "Module `${key}' has an unsupported attribute `${head (attrNames badAttrs)}'."
else
{ inherit file;
{ file = m._file or file;
key = toString m.key or key;
imports = m.imports or [];
options = m.options or {};
config = m.config or {};
}
else
{ inherit file;
{ file = m._file or file;
key = toString m.key or key;
imports = m.require or [] ++ m.imports or [];
options = {};
config = removeAttrs m ["key" "require" "imports"];
config = removeAttrs m ["key" "_file" "require" "imports"];
};
applyIfFunction = f: arg: if builtins.isFunction f then f arg else f;
@ -151,7 +151,7 @@ rec {
let
# Process mkOverride properties, adding in the default
# value specified in the option declaration (if any).
defsFinal = filterOverrides'
defsFinal = filterOverrides
((if opt ? default then [{ file = head opt.declarations; value = mkOptionDefault opt.default; }] else []) ++ defs);
files = map (def: def.file) defsFinal;
# Type-check the remaining definitions, and merge them if
@ -163,7 +163,7 @@ rec {
fold (def: res:
if opt.type.check def.value then res
else throw "The option value `${showOption loc}' in `${def.file}' is not a ${opt.type.name}.")
(opt.type.merge { prefix = loc; inherit files; } (map (m: m.value) defsFinal)) defsFinal;
(opt.type.merge loc defsFinal) defsFinal;
# Finally, apply the ‘apply’ function to the merged
# value. This allows options to yield a value computed
# from the definitions.
@ -240,7 +240,7 @@ rec {
Note that "z" has the default priority 100.
*/
filterOverrides' = defs:
filterOverrides = defs:
let
defaultPrio = 100;
getPrio = def: if def.value._type or "" == "override" then def.value.priority else defaultPrio;
@ -249,9 +249,6 @@ rec {
strip = def: if def.value._type or "" == "override" then def // { value = def.value.content; } else def;
in concatMap (def: if getPrio def == highestPrio then [(strip def)] else []) defs;
/* For use in options like environment.variables. */
filterOverrides = defs: map (def: def.value) (filterOverrides' (map (def: { value = def; }) defs));
/* Hack for backward compatibility: convert options of type
optionSet to configOf. FIXME: remove eventually. */
fixupOptionType = loc: opt:

31
lib/options.nix
View File

@ -30,36 +30,39 @@ rec {
type = lib.types.bool;
};
mergeDefaultOption = args: list:
mergeDefaultOption = loc: defs:
let list = getValues defs; in
if length list == 1 then head list
else if all builtins.isFunction list then x: mergeDefaultOption args (map (f: f x) list)
else if all builtins.isFunction list then x: mergeDefaultOption loc (map (f: f x) list)
else if all isList list then concatLists list
else if all isAttrs list then fold lib.mergeAttrs {} list
else if all builtins.isBool list then fold lib.or false list
else if all builtins.isString list then lib.concatStrings list
else if all builtins.isInt list && all (x: x == head list) list then head list
else throw "Cannot merge definitions of `${showOption args.prefix}' given in ${showFiles args.files}.";
else throw "Cannot merge definitions of `${showOption loc}' given in ${showFiles (getFiles defs)}.";
/* Obsolete, will remove soon. Specify an option type or apply
function instead. */
mergeTypedOption = typeName: predicate: merge: args: list:
if all predicate list then merge list
else throw "Expect a ${typeName}.";
mergeTypedOption = typeName: predicate: merge: loc: list:
let list' = map (x: x.value) list; in
if all predicate list then merge list'
else throw "Expected a ${typeName}.";
mergeEnableOption = mergeTypedOption "boolean"
(x: true == x || false == x) (fold lib.or false);
mergeListOption = mergeTypedOption "list" isList concatLists;
mergeStringOption = mergeTypedOption "string"
(x: if builtins ? isString then builtins.isString x else x + "")
lib.concatStrings;
mergeStringOption = mergeTypedOption "string" builtins.isString lib.concatStrings;
mergeOneOption = args: list:
if list == [] then abort "This case should never happen."
else if length list != 1 then
throw "The unique option `${showOption args.prefix}' is defined multiple times, in ${showFiles args.files}."
else head list;
mergeOneOption = loc: defs:
if defs == [] then abort "This case should never happen."
else if length defs != 1 then
throw "The unique option `${showOption loc}' is defined multiple times, in ${showFiles (getFiles defs)}."
else (head defs).value;
getValues = map (x: x.value);
getFiles = map (x: x.file);
# Generate documentation template from the list of option declaration like

107
lib/types.nix
View File

@ -27,6 +27,11 @@ rec {
# its type-correct, false otherwise.
check ? (x: true)
, # Merge a list of definitions together into a single value.
# This function is called with two arguments: the location of
# the option in the configuration as a list of strings
# (e.g. ["boot" "loader "grub" "enable"]), and a list of
# definition values and locations (e.g. [ { file = "/foo.nix";
# value = 1; } { file = "/bar.nix"; value = 2 } ]).
merge ? mergeDefaultOption
, # Return a flat list of sub-options. Used to generate
# documentation.
@ -46,12 +51,13 @@ rec {
bool = mkOptionType {
name = "boolean";
check = builtins.isBool;
merge = args: fold lib.or false;
merge = loc: fold (x: lib.or x.value) false;
};
int = mkOptionType {
name = "integer";
check = builtins.isInt;
merge = mergeOneOption;
};
str = mkOptionType {
@ -60,38 +66,26 @@ rec {
merge = mergeOneOption;
};
# Merge multiple definitions by concatenating them (with the given
# separator between the values).
separatedString = sep: mkOptionType {
name = "string";
check = builtins.isString;
merge = loc: defs: lib.concatStringsSep sep (getValues defs);
};
lines = separatedString "\n";
commas = separatedString ",";
envVar = separatedString ":";
# Deprecated; should not be used because it quietly concatenates
# strings, which is usually not what you want.
string = mkOptionType {
name = "string";
check = builtins.isString;
merge = args: lib.concatStrings;
};
# Like ‘string’, but add newlines between every value. Useful for
# configuration file contents.
lines = mkOptionType {
name = "string";
check = builtins.isString;
merge = args: lib.concatStringsSep "\n";
};
commas = mkOptionType {
name = "string";
check = builtins.isString;
merge = args: lib.concatStringsSep ",";
};
envVar = mkOptionType {
name = "environment variable";
inherit (string) check;
merge = args: lib.concatStringsSep ":";
};
string = separatedString "";
attrs = mkOptionType {
name = "attribute set";
check = isAttrs;
merge = args: fold lib.mergeAttrs {};
merge = loc: fold (def: lib.mergeAttrs def.value) {};
};
# derivation is a reserved keyword.
@ -114,15 +108,21 @@ rec {
listOf = elemType: mkOptionType {
name = "list of ${elemType.name}s";
check = value: isList value && all elemType.check value;
merge = args: defs: imap (n: def: elemType.merge (addToPrefix args (toString n)) [def]) (concatLists defs);
merge = loc: defs:
concatLists (imap (n: def: imap (m: def':
elemType.merge (loc ++ ["[${toString n}-${toString m}]"])
[{ inherit (def) file; value = def'; }]) def.value) defs);
getSubOptions = prefix: elemType.getSubOptions (prefix ++ ["*"]);
};
attrsOf = elemType: mkOptionType {
name = "attribute set of ${elemType.name}s";
check = x: isAttrs x && all elemType.check (lib.attrValues x);
merge = args: lib.zipAttrsWith (name:
elemType.merge (addToPrefix (args // { inherit name; }) name));
merge = loc: defs:
zipAttrsWith (name: elemType.merge (loc ++ [name]))
# Push down position info.
(map (def: listToAttrs (mapAttrsToList (n: def':
{ name = n; value = { inherit (def) file; value = def'; }; }) def.value)) defs);
getSubOptions = prefix: elemType.getSubOptions (prefix ++ ["<name>"]);
};
@ -130,22 +130,25 @@ rec {
loaOf = elemType:
let
convertIfList = defIdx: def:
if isList def then
listToAttrs (
flip imap def (elemIdx: elem:
{ name = "unnamed-${toString defIdx}.${toString elemIdx}"; value = elem; }))
if isList def.value then
{ inherit (def) file;
value = listToAttrs (
imap (elemIdx: elem:
{ name = "unnamed-${toString defIdx}.${toString elemIdx}";
value = elem;
}) def.value);
}
else
def;
listOnly = listOf elemType;
attrOnly = attrsOf elemType;
in mkOptionType {
name = "list or attribute set of ${elemType.name}s";
check = x:
if isList x then listOnly.check x
else if isAttrs x then attrOnly.check x
else false;
merge = args: defs: attrOnly.merge args (imap convertIfList defs);
merge = loc: defs: attrOnly.merge loc (imap convertIfList defs);
getSubOptions = prefix: elemType.getSubOptions (prefix ++ ["<name?>"]);
};
@ -155,29 +158,23 @@ rec {
getSubOptions = elemType.getSubOptions;
};
none = elemType: mkOptionType {
inherit (elemType) name check;
merge = args: list:
throw "No definitions are allowed for the option `${showOption args.prefix}'.";
getSubOptions = elemType.getSubOptions;
};
nullOr = elemType: mkOptionType {
name = "null or ${elemType.name}";
check = x: builtins.isNull x || elemType.check x;
merge = args: defs:
if all isNull defs then null
else if any isNull defs then
throw "The option `${showOption args.prefix}' is defined both null and not null, in ${showFiles args.files}."
else elemType.merge args defs;
merge = loc: defs:
let nrNulls = count (def: isNull def.value) defs; in
if nrNulls == length defs then null
else if nrNulls != 0 then
throw "The option `${showOption loc}' is defined both null and not null, in ${showFiles (getFiles defs)}."
else elemType.merge loc defs;
getSubOptions = elemType.getSubOptions;
};
functionTo = elemType: mkOptionType {
name = "function that evaluates to a(n) ${elemType.name}";
check = builtins.isFunction;
merge = args: fns:
fnArgs: elemType.merge args (map (fn: fn fnArgs) fns);
merge = loc: defs:
fnArgs: elemType.merge loc (map (fn: { inherit (fn) file; value = fn.value fnArgs; }) defs);
getSubOptions = elemType.getSubOptions;
};
@ -186,11 +183,11 @@ rec {
mkOptionType rec {
name = "submodule";
check = x: isAttrs x || builtins.isFunction x;
merge = args: defs:
merge = loc: defs:
let
coerce = def: if builtins.isFunction def then def else { config = def; };
modules = opts' ++ map coerce defs;
in (evalModules { inherit modules args; prefix = args.prefix; }).config;
modules = opts' ++ map (def: { _file = def.file; imports = [(coerce def.value)]; }) defs;
in (evalModules { inherit modules; args.name = last loc; prefix = loc; }).config;
getSubOptions = prefix: (evalModules
{ modules = opts'; inherit prefix;
# FIXME: hack to get shit to evaluate.
@ -206,8 +203,4 @@ rec {
};
/* Helper function. */
addToPrefix = args: name: args // { prefix = args.prefix ++ [name]; };
}

20
nixos/modules/config/shells-environment.nix
View File

@ -25,15 +25,17 @@ in
'';
type = types.attrsOf (mkOptionType {
name = "a string or a list of strings";
merge = args: xs:
let xs' = filterOverrides xs; in
if isList (head xs') then concatLists xs'
else if builtins.lessThan 1 (length xs') then
# Don't show location info here, since it's too general.
throw "The option `${showOption args.prefix}' is defined multiple times."
else if !builtins.isString (head xs') then
throw "The option `${showOption args.prefix}' does not have a string value."
else head xs';
merge = loc: defs:
let
defs' = filterOverrides defs;
res = (head defs').value;
in
if isList res then concatLists (getValues defs')
else if builtins.lessThan 1 (length defs') then
throw "The option `${showOption loc}' is defined multiple times, in ${showFiles (getFiles defs)}."
else if !builtins.isString res then
throw "The option `${showOption loc}' does not have a string value, in ${showFiles (getFiles defs)}."
else res;
});
apply = mapAttrs (n: v: if isList v then concatStringsSep ":" v else v);
};

2
nixos/modules/config/sysctl.nix
View File

@ -7,7 +7,7 @@ let
sysctlOption = mkOptionType {
name = "sysctl option value";
check = x: builtins.isBool x || builtins.isString x || builtins.isInt x;
merge = args: xs: last xs; # FIXME: hacky way to allow overriding in configuration.nix.
merge = args: defs: (last defs).value; # FIXME: hacky way to allow overriding in configuration.nix.
};
in

2
nixos/modules/misc/nixpkgs.nix
View File

@ -26,7 +26,7 @@ let
configType = mkOptionType {
name = "nixpkgs config";
check = traceValIfNot isConfig;
merge = args: fold mergeConfig {};
merge = args: fold (def: mergeConfig def.value) {};
};
in