fs_utils: specify path for foreign-file root cache

As the internal distdir data structure now supports the
executable bit, it is also expressive enough to support
foreign-file repositories. Hence we can use this cache,
getting potentially more cache hits.

1 files changed, 17 insertions, 0 deletions

diff --git a/src/buildtool/storage/fs_utils.cpp b/src/buildtool/storage/fs_utils.cpp
index f6055579..83167181 100644
--- a/src/buildtool/storage/fs_utils.cpp
+++ b/src/buildtool/storage/fs_utils.cpp
@@ -14,6 +14,10 @@
 
 #include "src/buildtool/storage/fs_utils.hpp"
 
+#include <unordered_map>
+#include <utility>
+
+#include "nlohmann/json.hpp"
 #include "src/buildtool/file_system/file_system_manager.hpp"
 #include "src/buildtool/storage/config.hpp"
 #include "src/buildtool/storage/storage.hpp"
@@ -63,6 +67,19 @@ auto GetArchiveTreeIDFile(std::string const& repo_type,
     return StorageConfig::BuildRoot() / "tree-map" / repo_type / content;
 }
 
+auto GetForeignFileTreeIDFile(std::string const& content,
+                              std::string const& name,
+                              bool executable) noexcept
+    -> std::filesystem::path {
+    return GetDistdirTreeIDFile(
+        HashFunction::ComputeBlobHash(
+            nlohmann::json(
+                std::unordered_map<std::string, std::pair<std::string, bool>>{
+                    {name, {content, executable}}})
+                .dump())
+            .HexString());
+}
+
 auto GetDistdirTreeIDFile(std::string const& content) noexcept
     -> std::filesystem::path {
     return StorageConfig::BuildRoot() / "distfiles-tree-map" / content;