GitRepo: Add method to create tree from directory

The tree is traversed bottom-up and each entry is explicitly added
to the object database: non-directory entries have their content
read and are added as blobs with corresponding permissions based on
file type (regular, executable, symlink), while subdirectories are
added as trees via CreateTree based on the already added blobs.

1 files changed, 19 insertions, 0 deletions

diff --git a/src/buildtool/file_system/git_repo.hpp b/src/buildtool/file_system/git_repo.hpp
index 31d9eb82..2aabf7ee 100644
--- a/src/buildtool/file_system/git_repo.hpp
+++ b/src/buildtool/file_system/git_repo.hpp
@@ -358,6 +358,25 @@ class GitRepo {
     [[nodiscard]] auto GetGitOdb() const noexcept
         -> std::unique_ptr<git_odb, decltype(&odb_closer)> const&;
 
+    using StoreDirEntryFunc =
+        std::function<bool(std::filesystem::path const&, ObjectType type)>;
+
+    /// \brief Helper function to read the entries of a filesystem subdirectory
+    /// and store them to the ODB. It is a modified version of the same-named
+    /// function from FileSystemManager which accepts a subdir and a specific
+    /// logger instead of the default.
+    [[nodiscard]] static auto ReadDirectory(
+        std::filesystem::path const& dir,
+        StoreDirEntryFunc const& read_and_store_entry,
+        anon_logger_ptr const& logger) noexcept -> bool;
+
+    /// \brief Create a tree from the content of a directory by recursively
+    /// adding its entries to the object database.
+    /// \return The raw id of the tree.
+    [[nodiscard]] auto CreateTreeFromDirectory(
+        std::filesystem::path const& dir,
+        anon_logger_ptr const& logger) noexcept -> std::optional<std::string>;
+
     /// \brief Helper function to allocate and populate the char** pointer of a
     /// git_strarray from a vector of standard strings. User MUST use
     /// git_strarray_dispose to deallocate the inner pointer when the strarray