FileRoot: Add new absent root underlying type variant

Absent roots are characterised only by a Git tree hash, so a new
variant of the underlying stored information was added in the form
of a plain string.

In order to avoid unwanted implicit conversions when instantiating
via literal strings, we force callers of the constructors to
explicitly differentiate between plain strings and filesystem
paths. Existing tests were updated to reflect this.

Co-authored-by: Alberto Sartori <alberto.sartori@huawei.com>

4 files changed, 19 insertions, 11 deletions

diff --git a/test/buildtool/build_engine/target_map/target_map.test.cpp b/test/buildtool/build_engine/target_map/target_map.test.cpp
index bd868b48..6397ba1d 100644
--- a/test/buildtool/build_engine/target_map/target_map.test.cpp
+++ b/test/buildtool/build_engine/target_map/target_map.test.cpp
@@ -12,6 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+#include <filesystem>
+
 #include "catch2/catch_test_macros.hpp"
 #include "src/buildtool/build_engine/base_maps/directory_map.hpp"
 #include "src/buildtool/build_engine/base_maps/entity_name.hpp"
@@ -47,10 +49,14 @@ void SetupConfig() {
     [[maybe_unused]] static auto done = CreateSymlinks();
     // create the file roots
     auto info = RepositoryConfig::RepositoryInfo{
-        FileRoot{"test/buildtool/build_engine/target_map/data_src"},
-        FileRoot{"test/buildtool/build_engine/target_map/data_targets"},
-        FileRoot{"test/buildtool/build_engine/target_map/data_rules"},
-        FileRoot{"test/buildtool/build_engine/target_map/data_expr"}};
+        FileRoot{std::filesystem::path{"test/buildtool/build_engine/target_map/"
+                                       "data_src"}},
+        FileRoot{std::filesystem::path{"test/buildtool/build_engine/target_map/"
+                                       "data_targets"}},
+        FileRoot{std::filesystem::path{"test/buildtool/build_engine/target_map/"
+                                       "data_rules"}},
+        FileRoot{std::filesystem::path{"test/buildtool/build_engine/target_map/"
+                                       "data_expr"}}};
     RepositoryConfig::Instance().Reset();
     RepositoryConfig::Instance().SetInfo("", std::move(info));
 }
diff --git a/test/buildtool/common/repository_config.test.cpp b/test/buildtool/common/repository_config.test.cpp
index 29c89d50..cfde95ed 100644
--- a/test/buildtool/common/repository_config.test.cpp
+++ b/test/buildtool/common/repository_config.test.cpp
@@ -43,7 +43,7 @@ namespace {
             return std::move(*root);
         }
     }
-    return FileRoot{"missing"};
+    return FileRoot{std::filesystem::path{"missing"}};
 }
 
 [[nodiscard]] auto CreateFixedRepoInfo(
@@ -61,7 +61,7 @@ namespace {
     std::string const& tfn = "TARGETS",
     std::string const& rfn = "RULES",
     std::string const& efn = "EXPRESSIONS") {
-    static auto const kFileRoot = FileRoot{"file path"};
+    static auto const kFileRoot = FileRoot{std::filesystem::path{"file path"}};
     return RepositoryConfig::RepositoryInfo{
         kFileRoot, kFileRoot, kFileRoot, kFileRoot, bindings, tfn, rfn, efn};
 }
diff --git a/test/buildtool/execution_engine/executor/executor_api.test.hpp b/test/buildtool/execution_engine/executor/executor_api.test.hpp
index ffee5184..bd02e0fb 100755
--- a/test/buildtool/execution_engine/executor/executor_api.test.hpp
+++ b/test/buildtool/execution_engine/executor/executor_api.test.hpp
@@ -31,8 +31,8 @@
 using ApiFactory = std::function<IExecutionApi::Ptr()>;
 
 static inline void SetupConfig() {
-    auto info = RepositoryConfig::RepositoryInfo{
-        FileRoot{"test/buildtool/execution_engine/executor"}};
+    auto info = RepositoryConfig::RepositoryInfo{FileRoot{
+        std::filesystem::path{"test/buildtool/execution_engine/executor"}}};
     RepositoryConfig::Instance().SetInfo("", std::move(info));
 }
 
diff --git a/test/buildtool/file_system/file_root.test.cpp b/test/buildtool/file_system/file_root.test.cpp
index eab17ff6..8828fb7b 100644
--- a/test/buildtool/file_system/file_root.test.cpp
+++ b/test/buildtool/file_system/file_root.test.cpp
@@ -165,7 +165,8 @@ TEST_CASE("Creating file root", "[file_root]") {
         REQUIRE(root_path);
 
         CHECK(FileRoot{*root_path}.Exists("."));
-        CHECK_FALSE(FileRoot{"does_not_exist"}.Exists("."));
+        CHECK_FALSE(
+            FileRoot{std::filesystem::path{"does_not_exist"}}.Exists("."));
     }
 
     SECTION("git root") {
@@ -184,8 +185,9 @@ TEST_CASE("Creating file root", "[file_root]") {
         REQUIRE(root_path);
 
         CHECK(FileRoot{*root_path, /*ignore_special=*/true}.Exists("."));
-        CHECK_FALSE(
-            FileRoot{"does_not_exist", /*ignore_special=*/true}.Exists("."));
+        CHECK_FALSE(FileRoot{std::filesystem::path{"does_not_exist"},
+                             /*ignore_special=*/true}
+                        .Exists("."));
     }
 
     SECTION("git root ignore-special") {