[render-test] Add cache database path to the manifest

A path relative to the manifest pointing at the data cache.

render-test/manifest_parser.cpp

@@ -44,6 +44,10 @@ const std::string& Manifest::getResultPath() const {
     return resultPath;
 }
 
+const std::string& Manifest::getCachePath() const {
+    return cachePath;
+}
+
 const std::set<std::string>& Manifest::getProbes() const {
     return probes;
 }
@@ -305,6 +309,18 @@ mbgl::optional<Manifest> ManifestParser::parseManifest(const std::string& manife
             return mbgl::nullopt;
         }
     }
+    if (document.HasMember("cache_path")) {
+        const auto& cachePathValue = document["cache_path"];
+        if (!cachePathValue.IsString()) {
+            mbgl::Log::Warning(
+                mbgl::Event::General, "Invalid cache_path is provided inside the manifest file: %s", filePath.c_str());
+            return mbgl::nullopt;
+        }
+        manifest.cachePath = (getValidPath(manifest.manifestPath, ".") / cachePathValue.GetString()).string();
+        if (manifest.cachePath.empty()) {
+            return mbgl::nullopt;
+        }
+    }
     mbgl::filesystem::path baseTestPath;
     if (document.HasMember("base_test_path")) {
         const auto& testPathValue = document["base_test_path"];

render-test/manifest_parser.hpp

@@ -20,6 +20,7 @@ public:
     const std::string& getAssetPath() const;
     const std::string& getManifestPath() const;
     const std::string& getResultPath() const;
+    const std::string& getCachePath() const;
     const std::set<std::string>& getProbes() const;
     void doShuffle(uint32_t seed);
 
@@ -47,6 +48,7 @@ private:
     std::string vendorPath;
     std::string assetPath;
     std::string resultPath;
+    std::string cachePath;
     std::vector<std::pair<std::string, std::string>> ignores;
     std::vector<TestPaths> testPaths;
     std::set<std::string> probes;