1 files changed, 86 insertions, 0 deletions
diff --git a/src/libstore/build/substitution-goal.hh b/src/libstore/build/substitution-goal.hh
new file mode 100644
index 000000000..70c806d23
--- /dev/null
+++ b/src/libstore/build/substitution-goal.hh
@@ -0,0 +1,86 @@
+#pragma once
+
+#include "lock.hh"
+#include "store-api.hh"
+#include "goal.hh"
+
+namespace nix {
+
+class Worker;
+
+struct PathSubstitutionGoal : public Goal
+{
+    /* The store path that should be realised through a substitute. */
+    StorePath storePath;
+
+    /* The path the substituter refers to the path as. This will be
+       different when the stores have different names. */
+    std::optional<StorePath> subPath;
+
+    /* The remaining substituters. */
+    std::list<ref<Store>> subs;
+
+    /* The current substituter. */
+    std::shared_ptr<Store> sub;
+
+    /* Whether a substituter failed. */
+    bool substituterFailed = false;
+
+    /* Path info returned by the substituter's query info operation. */
+    std::shared_ptr<const ValidPathInfo> info;
+
+    /* Pipe for the substituter's standard output. */
+    Pipe outPipe;
+
+    /* The substituter thread. */
+    std::thread thr;
+
+    std::promise<void> promise;
+
+    /* Whether to try to repair a valid path. */
+    RepairFlag repair;
+
+    /* Location where we're downloading the substitute.  Differs from
+       storePath when doing a repair. */
+    Path destPath;
+
+    std::unique_ptr<MaintainCount<uint64_t>> maintainExpectedSubstitutions,
+        maintainRunningSubstitutions, maintainExpectedNar, maintainExpectedDownload;
+
+    typedef void (PathSubstitutionGoal::*GoalState)();
+    GoalState state;
+
+    /* Content address for recomputing store path */
+    std::optional<ContentAddress> ca;
+
+public:
+    PathSubstitutionGoal(const StorePath & storePath, Worker & worker, RepairFlag repair = NoRepair, std::optional<ContentAddress> ca = std::nullopt);
+    ~PathSubstitutionGoal();
+
+    void timedOut(Error && ex) override { abort(); };
+
+    string key() override
+    {
+        /* "a$" ensures substitution goals happen before derivation
+           goals. */
+        return "a$" + std::string(storePath.name()) + "$" + worker.store.printStorePath(storePath);
+    }
+
+    void work() override;
+
+    /* The states. */
+    void init();
+    void tryNext();
+    void gotInfo();
+    void referencesValid();
+    void tryToRun();
+    void finished();
+
+    /* Callback used by the worker to write to the log. */
+    void handleChildOutput(int fd, const string & data) override;
+    void handleEOF(int fd) override;
+
+    void cleanup() override;
+};
+
+}