From 82ae2aa5a8cfb14a1547a608844bedee218d2c2d Mon Sep 17 00:00:00 2001
From: Sascha Roloff <sascha.roloff@huawei.com>
Date: Fri, 8 Jul 2022 11:49:31 +0200
Subject: Allow to read git trees from global CAS as well as local workspace
 root

---
 src/buildtool/file_system/file_root.hpp | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'src/buildtool/file_system/file_root.hpp')

diff --git a/src/buildtool/file_system/file_root.hpp b/src/buildtool/file_system/file_root.hpp
index 10b04c66..893b028c 100644
--- a/src/buildtool/file_system/file_root.hpp
+++ b/src/buildtool/file_system/file_root.hpp
@@ -421,6 +421,19 @@ class FileRoot {
         return std::nullopt;
     }
 
+    [[nodiscard]] auto ReadTree(std::string const& tree_id) const noexcept
+        -> std::optional<GitTree> {
+        if (std::holds_alternative<git_root_t>(root_)) {
+            try {
+                auto const& cas = std::get<git_root_t>(root_).cas;
+                return GitTree::Read(cas, tree_id);
+            } catch (...) {
+                return std::nullopt;
+            }
+        }
+        return std::nullopt;
+    }
+
     // Create LOCAL or KNOWN artifact. Does not check existence for LOCAL.
     // `file_path` must reference a blob.
     [[nodiscard]] auto ToArtifactDescription(
-- 
cgit v1.2.3