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#pragma once
#include <functional>
#include <nlohmann/json_fwd.hpp>
#include "fs-accessor.hh"
namespace nix {
struct Source;
/* Return an object that provides access to the contents of a NAR
file. */
ref<FSAccessor> makeNarAccessor(std::string && nar);
ref<FSAccessor> makeNarAccessor(Source & source);
/* 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. */
typedef std::function<std::string(uint64_t, uint64_t)> GetNarBytes;
ref<FSAccessor> makeLazyNarAccessor(
const std::string & listing,
GetNarBytes getNarBytes);
/* Write a JSON representation of the contents of a NAR (except file
contents). */
nlohmann::json listNar(ref<FSAccessor> accessor, const Path & path, bool recurse);
}
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