forked from lix-project/lix
108 lines
2.7 KiB
C++
108 lines
2.7 KiB
C++
#pragma once
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#include "types.hh"
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#include "hash.hh"
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#include "path.hh"
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#include "tree-info.hh"
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#include <memory>
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#include <variant>
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#include <nlohmann/json_fwd.hpp>
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namespace nix { class Store; }
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namespace nix::fetchers {
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struct Input;
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struct Tree
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{
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Path actualPath;
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StorePath storePath;
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TreeInfo info;
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};
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struct Input : std::enable_shared_from_this<Input>
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{
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std::optional<Hash> narHash; // FIXME: implement
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virtual std::string type() const = 0;
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virtual ~Input() { }
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virtual bool operator ==(const Input & other) const { return false; }
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/* Check whether this is a "direct" input, that is, not
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one that goes through a registry. */
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virtual bool isDirect() const { return true; }
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/* Check whether this is an "immutable" input, that is,
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one that contains a commit hash or content hash. */
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virtual bool isImmutable() const { return (bool) narHash; }
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virtual bool contains(const Input & other) const { return false; }
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virtual std::optional<std::string> getRef() const { return {}; }
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virtual std::optional<Hash> getRev() const { return {}; }
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virtual std::string to_string() const = 0;
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typedef std::variant<std::string, int64_t> Attr;
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typedef std::map<std::string, Attr> Attrs;
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Attrs toAttrs() const;
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std::pair<Tree, std::shared_ptr<const Input>> fetchTree(ref<Store> store) const;
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virtual std::shared_ptr<const Input> applyOverrides(
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std::optional<std::string> ref,
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std::optional<Hash> rev) const;
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virtual std::optional<Path> getSourcePath() const { return {}; }
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virtual void markChangedFile(
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std::string_view file,
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std::optional<std::string> commitMsg) const
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{ assert(false); }
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virtual void clone(const Path & destDir) const
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{
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throw Error("do not know how to clone input '%s'", to_string());
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}
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private:
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virtual std::pair<Tree, std::shared_ptr<const Input>> fetchTreeInternal(ref<Store> store) const = 0;
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virtual Attrs toAttrsInternal() const = 0;
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};
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struct ParsedURL;
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struct InputScheme
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{
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virtual ~InputScheme() { }
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virtual std::unique_ptr<Input> inputFromURL(const ParsedURL & url) = 0;
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virtual std::unique_ptr<Input> inputFromAttrs(const Input::Attrs & attrs) = 0;
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};
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std::unique_ptr<Input> inputFromURL(const ParsedURL & url);
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std::unique_ptr<Input> inputFromURL(const std::string & url);
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std::unique_ptr<Input> inputFromAttrs(const Input::Attrs & attrs);
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void registerInputScheme(std::unique_ptr<InputScheme> && fetcher);
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nlohmann::json attrsToJson(const Input::Attrs & attrs);
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std::optional<std::string> maybeGetStrAttr(const Input::Attrs & attrs, const std::string & name);
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std::string getStrAttr(const Input::Attrs & attrs, const std::string & name);
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}
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