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https://github.com/NixOS/nix
synced 2024-09-20 23:28:26 -04:00
3b5429aec1
This is needed to push the adoption of structured attrs[1] forward. It's now checked if a `__json` exists in the environment-map of the derivation to be openend in a `nix-shell`. Derivations with structured attributes enabled also make use of a file named `.attrs.json` containing every environment variable represented as JSON which is useful for e.g. `exportReferencesGraph`[2]. To provide an environment similar to the build sandbox, `nix-shell` now adds a `.attrs.json` to `cwd` (which is mostly equal to the one in the build sandbox) and removes it using an exit hook when closing the shell. To avoid leaking internals of the build-process to the `nix-shell`, the entire logic to generate JSON and shell code for structured attrs was moved into the `ParsedDerivation` class. [1] https://nixos.mayflower.consulting/blog/2020/01/20/structured-attrs/ [2] https://nixos.org/manual/nix/unstable/expressions/advanced-attributes.html#advanced-attributes
46 lines
1.1 KiB
C++
46 lines
1.1 KiB
C++
#pragma once
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#include "store-api.hh"
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#include <nlohmann/json_fwd.hpp>
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namespace nix {
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typedef std::pair<std::string, nlohmann::json> StructuredAttrsWithShellRC;
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class ParsedDerivation
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{
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StorePath drvPath;
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BasicDerivation & drv;
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std::unique_ptr<nlohmann::json> structuredAttrs;
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public:
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ParsedDerivation(const StorePath & drvPath, BasicDerivation & drv);
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~ParsedDerivation();
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const nlohmann::json * getStructuredAttrs() const
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{
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return structuredAttrs.get();
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}
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std::optional<std::string> getStringAttr(const std::string & name) const;
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bool getBoolAttr(const std::string & name, bool def = false) const;
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std::optional<Strings> getStringsAttr(const std::string & name) const;
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StringSet getRequiredSystemFeatures() const;
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bool canBuildLocally(Store & localStore) const;
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bool willBuildLocally(Store & localStore) const;
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bool substitutesAllowed() const;
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std::optional<StructuredAttrsWithShellRC> generateStructuredAttrs(std::optional<StringMap> inputRewrites, Store & store, const StorePathSet & inputPaths);
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};
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}
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