forked from lix-project/lix
78 lines
2.1 KiB
C++
78 lines
2.1 KiB
C++
#pragma once
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#include <variant>
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#include "hash.hh"
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namespace nix {
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enum struct FileIngestionMethod : uint8_t {
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Flat = false,
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Recursive = true
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};
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struct TextHash {
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Hash hash;
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};
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/// Pair of a hash, and how the file system was ingested
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struct FixedOutputHash {
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FileIngestionMethod method;
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Hash hash;
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std::string printMethodAlgo() const;
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};
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/*
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We've accumulated several types of content-addressed paths over the years;
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fixed-output derivations support multiple hash algorithms and serialisation
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methods (flat file vs NAR). Thus, ‘ca’ has one of the following forms:
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* ‘text:sha256:<sha256 hash of file contents>’: For paths
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computed by makeTextPath() / addTextToStore().
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* ‘fixed:<r?>:<ht>:<h>’: For paths computed by
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makeFixedOutputPath() / addToStore().
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*/
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typedef std::variant<
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TextHash, // for paths computed by makeTextPath() / addTextToStore
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FixedOutputHash // for path computed by makeFixedOutputPath
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> ContentAddress;
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/* Compute the prefix to the hash algorithm which indicates how the files were
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ingested. */
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std::string makeFileIngestionPrefix(const FileIngestionMethod m);
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/* Compute the content-addressability assertion (ValidPathInfo::ca)
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for paths created by makeFixedOutputPath() / addToStore(). */
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std::string makeFixedOutputCA(FileIngestionMethod method, const Hash & hash);
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std::string renderContentAddress(ContentAddress ca);
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std::string renderContentAddress(std::optional<ContentAddress> ca);
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ContentAddress parseContentAddress(std::string_view rawCa);
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std::optional<ContentAddress> parseContentAddressOpt(std::string_view rawCaOpt);
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Hash getContentAddressHash(const ContentAddress & ca);
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/*
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We only have one way to hash text with references, so this is single-value
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type is only useful in std::variant.
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*/
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struct TextHashMethod { };
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struct FixedOutputHashMethod {
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FileIngestionMethod fileIngestionMethod;
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HashType hashType;
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};
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typedef std::variant<
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TextHashMethod,
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FixedOutputHashMethod
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> ContentAddressMethod;
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ContentAddressMethod parseContentAddressMethod(std::string_view rawCaMethod);
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std::string renderContentAddressMethod(ContentAddressMethod caMethod);
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}
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