Merge remote-tracking branch 'tweag/flake-add' into flakes

src/libexpr/primops/flake.cc

@@ -12,9 +12,14 @@
 
 namespace nix {
 
+Path getUserRegistryPath()
+{
+    return getHome() + "/.config/nix/registry.json";
+}
+
 /* Read the registry or a lock file. (Currently they have an identical
    format. */
-static std::unique_ptr<FlakeRegistry> readRegistry(const Path & path)
+std::unique_ptr<FlakeRegistry> readRegistry(const Path & path)
 {
     auto registry = std::make_unique<FlakeRegistry>();
 
@@ -40,7 +45,7 @@ void writeRegistry(FlakeRegistry registry, Path path)
     json["version"] = 1;
     json["flakes"] = {};
     for (auto elem : registry.entries) {
-        json["flakes"][elem.first] = elem.second.ref.to_string();
+        json["flakes"][elem.first] = { {"uri", elem.second.ref.to_string()} };
     }
     writeFile(path, json.dump(4)); // The '4' is the number of spaces used in the indentation in the json file.
 }
@@ -183,8 +188,8 @@ Flake getFlake(EvalState & state, const FlakeRef & flakeRef)
     if (std::get_if<FlakeRef::IsGitHub>(&newFlakeRef.data)) {
         FlakeSourceInfo srcInfo = fetchFlake(state, newFlakeRef);
         if (srcInfo.rev) {
-            std::string uri = flakeRef.to_string();
-            newFlakeRef = FlakeRef(uri + "/" + srcInfo.rev->to_string());
+            std::string uri = flakeRef.baseRef().to_string();
+            newFlakeRef = FlakeRef(uri + "/" + srcInfo.rev->to_string(Base16, false));
         }
     }
 

src/libexpr/primops/flake.hh

@@ -14,14 +14,19 @@ struct FlakeRegistry
     {
         FlakeRef ref;
         Entry(const FlakeRef & flakeRef) : ref(flakeRef) {};
+        Entry operator=(const Entry & entry) { return Entry(entry.ref); }
     };
     std::map<FlakeId, Entry> entries;
 };
 
+Path getUserRegistryPath();
+
 Value * makeFlakeRegistryValue(EvalState & state);
 
 Value * makeFlakeValue(EvalState & state, std::string flakeUri, Value & v);
 
+std::unique_ptr<FlakeRegistry> readRegistry(const Path &);
+
 void writeRegistry(FlakeRegistry, Path);
 
 struct Flake

src/libexpr/primops/flakeref.cc

@@ -152,4 +152,19 @@ bool FlakeRef::isImmutable() const
     else abort();
 }
 
+FlakeRef FlakeRef::baseRef() const // Removes the ref and rev from a FlakeRef.
+{
+    FlakeRef result(*this);
+    if (auto refData = std::get_if<FlakeRef::IsGitHub>(&result.data)) {
+        refData->ref = std::nullopt;
+        refData->rev = std::nullopt;
+    } else if (auto refData = std::get_if<FlakeRef::IsGit>(&result.data)) {
+        refData->ref = std::nullopt;
+        refData->rev = std::nullopt;
+    } else if (auto refData = std::get_if<FlakeRef::IsGit>(&result.data)) {
+        refData->ref = std::nullopt;
+        refData->rev = std::nullopt;
+    }
+    return result;
+}
 }

src/libexpr/primops/flakeref.hh

@@ -153,6 +153,7 @@ struct FlakeRef
     /* Check whether this is an "immutable" flake reference, that is,
        one that contains a commit hash or content hash. */
     bool isImmutable() const;
-};
 
+    FlakeRef baseRef() const;
+};
 }