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module system: revert "remove types.optionSet", just deprecate (#56857)

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The explicit remove helped to uncover some hidden uses of `optionSet`
in NixOps. However it makes life harder for end-users of NixOps - it will
be impossible to deploy 19.03 systems with old NixOps, but there is no
new release of NixOps with `optionSet` fixes.

Also, "deprecation" process isn't well defined. Even that `optionSet` was
declared "deprecated" for many years, it was never announced. Hence, I
leave "deprecation" announce. Then, 3 releases after announce,
we can announce removal of this feature.

This type has to be removed, not `throw`-ed in runtime, because it makes
some perfectly fine code to fail. For example:
```
$ nix-instantiate --eval -E '(import <nixpkgs/lib>).types' --strict
trace: `types.list` is deprecated; use `types.listOf` instead
error: types.optionSet is deprecated; use types.submodule instead
(use '--show-trace' to show detailed location information)
```
This commit is contained in:
Danylo Hlynskyi 2019-03-07 21:28:09 +02:00 committed by GitHub
parent cf1de3c2df
commit 60e8fcf0e5
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4 changed files with 24 additions and 6 deletions
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18
lib/modules.nix
View file

@ -476,8 +476,22 @@ rec {
optionSet to options of type submodule. FIXME: remove
eventually. */
fixupOptionType = loc: opt:
if opt.type.getSubModules or null == null
then opt // { type = opt.type or types.unspecified; }
let
options = opt.options or
(throw "Option `${showOption loc'}' has type optionSet but has no option attribute, in ${showFiles opt.declarations}.");
f = tp:
let optionSetIn = type: (tp.name == type) && (tp.functor.wrapped.name == "optionSet");
in
if tp.name == "option set" || tp.name == "submodule" then
throw "The option ${showOption loc} uses submodules without a wrapping type, in ${showFiles opt.declarations}."
else if optionSetIn "attrsOf" then types.attrsOf (types.submodule options)
else if optionSetIn "loaOf" then types.loaOf (types.submodule options)
else if optionSetIn "listOf" then types.listOf (types.submodule options)
else if optionSetIn "nullOr" then types.nullOr (types.submodule options)
else tp;
in
if opt.type.getSubModules or null == null
then opt // { type = f (opt.type or types.unspecified); }
else opt // { type = opt.type.substSubModules opt.options; options = []; };

2
lib/options.nix
View file

@ -48,6 +48,8 @@ rec {
visible ? null,
# Whether the option can be set only once
readOnly ? null,
# Deprecated, used by types.optionSet.
options ? null
} @ attrs:
attrs // { _type = "option"; };

6
lib/types.nix
View file

@ -469,8 +469,10 @@ rec {
# Obsolete alternative to configOf. It takes its option
# declarations from the ‘options’ attribute of containing option
# declaration.
optionSet = builtins.throw "types.optionSet is deprecated; use types.submodule instead" "optionSet";
optionSet = mkOptionType {
name = builtins.trace "types.optionSet is deprecated; use types.submodule instead" "optionSet";
description = "option set";
};
# Augment the given type with an additional type check function.
addCheck = elemType: check: elemType // { check = x: elemType.check x && check x; };

4
nixos/doc/manual/release-notes/rl-1903.xml
View file

@ -456,8 +456,8 @@
</listitem>
<listitem>
<para>
Support for NixOS module system type <literal>types.optionSet</literal> and
<literal>lib.mkOption</literal> argument <literal>options</literal> is removed.
NixOS module system type <literal>types.optionSet</literal> and
<literal>lib.mkOption</literal> argument <literal>options</literal> are deprecated.
Use <literal>types.submodule</literal> instead.
(<link xlink:href="https://github.com/NixOS/nixpkgs/pull/54637">#54637</link>)
</para>