Move parseTreeInfo()

src/libexpr/flake/lockfile.cc

@@ -32,44 +32,10 @@ FlakeRef getFlakeRef(
     throw Error("attribute '%s' missing in lock file", version4Attr);
 }
 
-static TreeInfo parseTreeInfo(const nlohmann::json & json)
-{
-    TreeInfo info;
-
-    auto i = json.find("info");
-    if (i != json.end()) {
-        const nlohmann::json & i2(*i);
-
-        auto j = i2.find("narHash");
-        if (j != i2.end())
-            info.narHash = Hash((std::string) *j);
-        else
-            throw Error("attribute 'narHash' missing in lock file");
-
-        j = i2.find("revCount");
-        if (j != i2.end())
-            info.revCount = *j;
-
-        j = i2.find("lastModified");
-        if (j != i2.end())
-            info.lastModified = *j;
-
-        return info;
-    }
-
-    i = json.find("narHash");
-    if (i != json.end()) {
-        info.narHash = Hash((std::string) *i);
-        return info;
-    }
-
-    throw Error("attribute 'info' missing in lock file");
-}
-
 LockedNode::LockedNode(const nlohmann::json & json)
     : lockedRef(getFlakeRef(json, "url", "uri", "locked"))
     , originalRef(getFlakeRef(json, "originalUrl", "originalUri", "original"))
-    , info(parseTreeInfo(json))
+    , info(TreeInfo::fromJson(json))
     , isFlake(json.find("flake") != json.end() ? (bool) json["flake"] : true)
 {
     if (!lockedRef.input->isImmutable())

src/libfetchers/tree-info.cc

@@ -11,6 +11,40 @@ StorePath TreeInfo::computeStorePath(Store & store) const
     return store.makeFixedOutputPath(true, narHash, "source");
 }
 
+TreeInfo TreeInfo::fromJson(const nlohmann::json & json)
+{
+    TreeInfo info;
+
+    auto i = json.find("info");
+    if (i != json.end()) {
+        const nlohmann::json & i2(*i);
+
+        auto j = i2.find("narHash");
+        if (j != i2.end())
+            info.narHash = Hash((std::string) *j);
+        else
+            throw Error("attribute 'narHash' missing in lock file");
+
+        j = i2.find("revCount");
+        if (j != i2.end())
+            info.revCount = *j;
+
+        j = i2.find("lastModified");
+        if (j != i2.end())
+            info.lastModified = *j;
+
+        return info;
+    }
+
+    i = json.find("narHash");
+    if (i != json.end()) {
+        info.narHash = Hash((std::string) *i);
+        return info;
+    }
+
+    throw Error("attribute 'info' missing in lock file");
+}
+
 nlohmann::json TreeInfo::toJson() const
 {
     nlohmann::json json;

src/libfetchers/tree-info.hh

@@ -25,6 +25,8 @@ struct TreeInfo
 
     StorePath computeStorePath(Store & store) const;
 
+    static TreeInfo fromJson(const nlohmann::json & json);
+
     nlohmann::json toJson() const;
 };