1 files changed, 21 insertions, 4 deletions

diff --git a/src/libstore/store-api.hh b/src/libstore/store-api.hh
index c8a667c6d..9eab4b4e5 100644
--- a/src/libstore/store-api.hh
+++ b/src/libstore/store-api.hh
@@ -14,6 +14,7 @@
 #include "path-info.hh"
 #include "repair-flag.hh"
 
+#include <nlohmann/json_fwd.hpp>
 #include <atomic>
 #include <limits>
 #include <map>
@@ -68,7 +69,9 @@ struct Derivation;
 class FSAccessor;
 class NarInfoDiskCache;
 class Store;
-class JSONPlaceholder;
+
+
+typedef std::map<std::string, StorePath> OutputPathMap;
 
 
 enum CheckSigsFlag : bool { NoCheckSigs = false, CheckSigs = true };
@@ -120,6 +123,8 @@ public:
 
     typedef std::map<std::string, std::string> Params;
 
+
+
 protected:
 
     struct PathInfoCacheValue {
@@ -179,7 +184,7 @@ public:
 
     /* Return true if ‘path’ is in the Nix store (but not the Nix
        store itself). */
-    bool isInStore(const Path & path) const;
+    bool isInStore(PathView path) const;
 
     /* Return true if ‘path’ is a store path, i.e. a direct child of
        the Nix store. */
@@ -187,7 +192,7 @@ public:
 
     /* Split a path like /nix/store/<hash>-<name>/<bla> into
        /nix/store/<hash>-<name> and /<bla>. */
-    std::pair<StorePath, Path> toStorePath(const Path & path) const;
+    std::pair<StorePath, Path> toStorePath(PathView path) const;
 
     /* Follow symlinks until we end up with a path in the Nix store. */
     Path followLinksToStore(std::string_view path) const;
@@ -512,7 +517,7 @@ public:
        variable elements such as the registration time are
        included. If ‘showClosureSize’ is true, the closure size of
        each path is included. */
-    void pathInfoToJSON(JSONPlaceholder & jsonOut, const StorePathSet & storePaths,
+    nlohmann::json pathInfoToJSON(const StorePathSet & storePaths,
         bool includeImpureInfo, bool showClosureSize,
         Base hashBase = Base32,
         AllowInvalidFlag allowInvalid = DisallowInvalid);
@@ -618,6 +623,13 @@ public:
      */
     StorePathSet exportReferences(const StorePathSet & storePaths, const StorePathSet & inputPaths);
 
+    /**
+     * Given a store path, return the realisation actually used in the realisation of this path:
+     * - If the path is a content-addressed derivation, try to resolve it
+     * - Otherwise, find one of its derivers
+     */
+    std::optional<StorePath> getBuildDerivationPath(const StorePath &);
+
     /* Hack to allow long-running processes like hydra-queue-runner to
        occasionally flush their path info cache. */
     void clearPathInfoCache()
@@ -719,6 +731,11 @@ void copyClosure(
 void removeTempRoots();
 
 
+/* Resolve the derived path completely, failing if any derivation output
+   is unknown. */
+OutputPathMap resolveDerivedPath(Store &, const DerivedPath::Built &, Store * evalStore = nullptr);
+
+
 /* Return a Store object to access the Nix store denoted by
    ‘uri’ (slight misnomer...). Supported values are: