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https://github.com/NixOS/nix
synced 2024-09-20 23:28:26 -04:00
bab1cda0e6
Rather than storing the derivation outputs as `drvPath!outputName` internally, store them as `drvHashModulo!outputName` (or `outputHash!outputName` for fixed-output derivations). This makes the storage slightly more opaque, but enables an earlier cutoff in cases where a fixed-output dependency changes (but keeps the same output hash) − same as what we already do for input-addressed derivations.
40 lines
956 B
C++
40 lines
956 B
C++
#pragma once
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#include "path.hh"
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#include <nlohmann/json_fwd.hpp>
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namespace nix {
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struct DrvOutput {
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// The hash modulo of the derivation
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Hash drvHash;
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std::string outputName;
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std::string to_string() const;
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std::string strHash() const
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{ return drvHash.to_string(Base16, true); }
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static DrvOutput parse(const std::string &);
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bool operator<(const DrvOutput& other) const { return to_pair() < other.to_pair(); }
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bool operator==(const DrvOutput& other) const { return to_pair() == other.to_pair(); }
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private:
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// Just to make comparison operators easier to write
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std::pair<Hash, std::string> to_pair() const
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{ return std::make_pair(drvHash, outputName); }
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};
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struct Realisation {
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DrvOutput id;
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StorePath outPath;
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nlohmann::json toJSON() const;
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static Realisation fromJSON(const nlohmann::json& json, const std::string& whence);
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};
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typedef std::map<DrvOutput, Realisation> DrvOutputs;
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}
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