mirror of
https://github.com/NixOS/nix
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188d97e1f1
The ability to substitute inputs was removed in #10612 because it was broken: with user-specified inputs containing a `narHash` attribute, substitution resulted in an input that lacked the attributes returned by the real fetcher (such as `lastModified`). To fix this, we introduce a new input attribute `final`. If `final = true`, fetching the input cannot add or change any attributes. We only attempt to substitute inputs that have `final = true`. This is implied by lock file entries; we only write a lock file if all its entries are "final". The user can specified `final = true` in `fetchTree`, in which case it is their responsibility to ensure that all attributes returned by the fetcher are included in the `fetchTree` call. For example, nix eval --impure --expr 'builtins.fetchTree { type = "github"; owner = "NixOS"; repo = "patchelf"; final = true; narHash = "sha256-FSoxTcRZMGHNJh8dNtKOkcUtjhmhU6yQXcZZfUPLhQM="; }' succeeds in a store path with the specified NAR hash exists or is substitutable, but fails with error: fetching final input '{"final":true,"narHash":"sha256-FSoxTcRZMGHNJh8dNtKOkcUtjhmhU6yQXcZZfUPLhQM=","owner":"NixOS","repo":"patchelf","type":"github"}' resulted in different input '{"final":true,"lastModified":1718457448,"narHash":"sha256-FSoxTcRZMGHNJh8dNtKOkcUtjhmhU6yQXcZZfUPLhQM=","owner":"NixOS","repo":"patchelf","rev":"a0f54334df36770b335c051e540ba40afcbf8378","type":"github"}'
96 lines
2.1 KiB
C++
96 lines
2.1 KiB
C++
#pragma once
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///@file
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#include "flakeref.hh"
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#include <nlohmann/json_fwd.hpp>
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namespace nix {
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class Store;
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class StorePath;
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}
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namespace nix::flake {
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typedef std::vector<FlakeId> InputPath;
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struct LockedNode;
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/**
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* A node in the lock file. It has outgoing edges to other nodes (its
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* inputs). Only the root node has this type; all other nodes have
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* type LockedNode.
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*/
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struct Node : std::enable_shared_from_this<Node>
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{
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typedef std::variant<ref<LockedNode>, InputPath> Edge;
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std::map<FlakeId, Edge> inputs;
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virtual ~Node() { }
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};
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/**
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* A non-root node in the lock file.
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*/
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struct LockedNode : Node
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{
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FlakeRef lockedRef, originalRef;
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bool isFlake = true;
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LockedNode(
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const FlakeRef & lockedRef,
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const FlakeRef & originalRef,
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bool isFlake = true)
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: lockedRef(lockedRef), originalRef(originalRef), isFlake(isFlake)
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{ }
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LockedNode(
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const fetchers::Settings & fetchSettings,
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const nlohmann::json & json);
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StorePath computeStorePath(Store & store) const;
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};
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struct LockFile
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{
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ref<Node> root = make_ref<Node>();
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LockFile() {};
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LockFile(
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const fetchers::Settings & fetchSettings,
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std::string_view contents, std::string_view path);
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typedef std::map<ref<const Node>, std::string> KeyMap;
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std::pair<nlohmann::json, KeyMap> toJSON() const;
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std::pair<std::string, KeyMap> to_string() const;
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/**
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* Check whether this lock file has any unlocked or non-final
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* inputs. If so, return one.
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*/
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std::optional<FlakeRef> isUnlocked() const;
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bool operator ==(const LockFile & other) const;
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std::shared_ptr<Node> findInput(const InputPath & path);
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std::map<InputPath, Node::Edge> getAllInputs() const;
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static std::string diff(const LockFile & oldLocks, const LockFile & newLocks);
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/**
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* Check that every 'follows' input target exists.
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*/
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void check();
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};
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std::ostream & operator <<(std::ostream & stream, const LockFile & lockFile);
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InputPath parseInputPath(std::string_view s);
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std::string printInputPath(const InputPath & path);
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}
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