nix-super/src/libfetchers/attrs.hh
Eelco Dolstra b36857ac8d Add a Git-based content-addressed tarball cache
GitArchiveInputScheme now streams tarballs into a Git repository. This
deduplicates data a lot, e.g. when you're fetching different revisions
of the Nixpkgs repo. It also warns if the tree hash returned by GitHub
doesn't match the tree hash of the imported tarball.
2023-11-29 12:37:03 +01:00

44 lines
1.1 KiB
C++

#pragma once
///@file
#include "types.hh"
#include "hash.hh"
#include <variant>
#include <nlohmann/json_fwd.hpp>
#include <optional>
namespace nix::fetchers {
typedef std::variant<std::string, uint64_t, Explicit<bool>> Attr;
/**
* An `Attrs` can be thought of a JSON object restricted or simplified
* to be "flat", not containing any subcontainers (arrays or objects)
* and also not containing any `null`s.
*/
typedef std::map<std::string, Attr> Attrs;
Attrs jsonToAttrs(const nlohmann::json & json);
nlohmann::json attrsToJSON(const Attrs & attrs);
std::optional<std::string> maybeGetStrAttr(const Attrs & attrs, const std::string & name);
std::string getStrAttr(const Attrs & attrs, const std::string & name);
std::optional<uint64_t> maybeGetIntAttr(const Attrs & attrs, const std::string & name);
uint64_t getIntAttr(const Attrs & attrs, const std::string & name);
std::optional<bool> maybeGetBoolAttr(const Attrs & attrs, const std::string & name);
bool getBoolAttr(const Attrs & attrs, const std::string & name);
std::map<std::string, std::string> attrsToQuery(const Attrs & attrs);
Hash getRevAttr(const Attrs & attrs, const std::string & name);
}