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#pragma once
///@file
#include <variant>
#include "hash.hh"
namespace nix {
/**
* An enumeration of the ways we can serialize file system objects.
*/
enum struct FileIngestionMethod : uint8_t {
/**
* Flat-file hashing. Directly ingest the contents of a single file
*/
Flat = false,
/**
* Recursive (or NAR) hashing. Serializes the file-system object in Nix
* Archive format and ingest that
*/
Recursive = true
};
/**
* Somewhat obscure, used by \ref Derivation derivations and
* `builtins.toFile` currently.
*/
struct TextHash {
/**
* Hash of the contents of the text/file.
*/
Hash hash;
};
/**
* For path computed by makeFixedOutputPath.
*/
struct FixedOutputHash {
/**
* How the file system objects are serialized
*/
FileIngestionMethod method;
/**
* Hash of that serialization
*/
Hash hash;
std::string printMethodAlgo() const;
};
/**
* We've accumulated several types of content-addressed paths over the
* years; fixed-output derivations support multiple hash algorithms and
* serialisation methods (flat file vs NAR). Thus, ‘ca’ has one of the
* following forms:
*
* - ‘text:sha256:<sha256 hash of file contents>’: For paths
* computed by Store::makeTextPath() / Store::addTextToStore().
*
* - ‘fixed:<r?>:<ht>:<h>’: For paths computed by
* Store::makeFixedOutputPath() / Store::addToStore().
*/
typedef std::variant<
TextHash,
FixedOutputHash
> ContentAddress;
/**
* Compute the prefix to the hash algorithm which indicates how the
* files were ingested.
*/
std::string makeFileIngestionPrefix(const FileIngestionMethod m);
/**
* Compute the content-addressability assertion (ValidPathInfo::ca) for
* paths created by Store::makeFixedOutputPath() / Store::addToStore().
*/
std::string makeFixedOutputCA(FileIngestionMethod method, const Hash & hash);
std::string renderContentAddress(ContentAddress ca);
std::string renderContentAddress(std::optional<ContentAddress> ca);
ContentAddress parseContentAddress(std::string_view rawCa);
std::optional<ContentAddress> parseContentAddressOpt(std::string_view rawCaOpt);
Hash getContentAddressHash(const ContentAddress & ca);
/*
We only have one way to hash text with references, so this is single-value
type is only useful in std::variant.
*/
struct TextHashMethod { };
struct FixedOutputHashMethod {
FileIngestionMethod fileIngestionMethod;
HashType hashType;
};
/**
* Ways of content addressing but not a complete ContentAddress.
*
* A ContentAddress without a Hash.
*/
typedef std::variant<
TextHashMethod,
FixedOutputHashMethod
> ContentAddressMethod;
ContentAddressMethod parseContentAddressMethod(std::string_view rawCaMethod);
std::string renderContentAddressMethod(ContentAddressMethod caMethod);
}
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