nix-super/src/libstore/nar-accessor.hh

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#pragma once
///@file
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#include "source-accessor.hh"
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#include <functional>
#include <nlohmann/json_fwd.hpp>
namespace nix {
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struct Source;
/**
* Return an object that provides access to the contents of a NAR
* file.
*/
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ref<SourceAccessor> makeNarAccessor(std::string && nar);
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ref<SourceAccessor> makeNarAccessor(Source & source);
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/**
* Create a NAR accessor from a NAR listing (in the format produced by
* listNar()). The callback getNarBytes(offset, length) is used by the
* readFile() method of the accessor to get the contents of files
* inside the NAR.
*/
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using GetNarBytes = std::function<std::string(uint64_t, uint64_t)>;
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ref<SourceAccessor> makeLazyNarAccessor(
const std::string & listing,
GetNarBytes getNarBytes);
/**
* Write a JSON representation of the contents of a NAR (except file
* contents).
*/
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nlohmann::json listNar(ref<SourceAccessor> accessor, const CanonPath & path, bool recurse);
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}