f0adb72c23
As discussed in our last meeting, we need a bit more time, but we are
"time boxing" the work left to do to ensure there is not unbounded
delay.
Rather than putting it back underneath `flakes`, though, put it
underneath its own `fetch-tree` experimental feature (which `flakes`
includes/implies). This signals our commitment to the plan to stabilize
it first without waiting to go through the rest of Flakes, and also will
give users a "release candidate" when we get closer to stabilization.
This reverts commit 4112dd1fc9.
106 lines
2.5 KiB
C++
106 lines
2.5 KiB
C++
#pragma once
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///@file
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#include "comparator.hh"
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#include "error.hh"
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#include "json-utils.hh"
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#include "types.hh"
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namespace nix {
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/**
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* The list of available experimental features.
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*
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* If you update this, don’t forget to also change the map defining
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* their string representation and documentation in the corresponding
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* `.cc` file as well.
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*/
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enum struct ExperimentalFeature
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{
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CaDerivations,
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ImpureDerivations,
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Flakes,
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FetchTree,
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NixCommand,
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RecursiveNix,
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NoUrlLiterals,
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FetchClosure,
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ReplFlake,
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AutoAllocateUids,
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Cgroups,
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DaemonTrustOverride,
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DynamicDerivations,
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ParseTomlTimestamps,
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ReadOnlyLocalStore,
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ConfigurableImpureEnv,
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VerifiedFetches,
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};
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/**
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* Just because writing `ExperimentalFeature::CaDerivations` is way too long
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*/
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using Xp = ExperimentalFeature;
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/**
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* Parse an experimental feature (enum value) from its name. Experimental
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* feature flag names are hyphenated and do not contain spaces.
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*/
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const std::optional<ExperimentalFeature> parseExperimentalFeature(
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const std::string_view & name);
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/**
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* Show the name of an experimental feature. This is the opposite of
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* parseExperimentalFeature().
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*/
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std::string_view showExperimentalFeature(const ExperimentalFeature);
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/**
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* Compute the documentation of all experimental features.
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*
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* See `doc/manual` for how this information is used.
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*/
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nlohmann::json documentExperimentalFeatures();
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/**
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* Shorthand for `str << showExperimentalFeature(feature)`.
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*/
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std::ostream & operator<<(
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std::ostream & str,
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const ExperimentalFeature & feature);
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/**
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* Parse a set of strings to the corresponding set of experimental
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* features, ignoring (but warning for) any unknown feature.
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*/
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std::set<ExperimentalFeature> parseFeatures(const std::set<std::string> &);
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/**
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* An experimental feature was required for some (experimental)
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* operation, but was not enabled.
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*/
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class MissingExperimentalFeature : public Error
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{
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public:
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/**
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* The experimental feature that was required but not enabled.
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*/
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ExperimentalFeature missingFeature;
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MissingExperimentalFeature(ExperimentalFeature missingFeature);
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};
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/**
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* Semi-magic conversion to and from json.
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* See the nlohmann/json readme for more details.
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*/
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void to_json(nlohmann::json &, const ExperimentalFeature &);
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void from_json(const nlohmann::json &, ExperimentalFeature &);
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/**
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* It is always rendered as a string
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*/
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template<>
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struct json_avoids_null<ExperimentalFeature> : std::true_type {};
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}
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