catch2 main: ensure proper build root

Some of our C-tests under catch2 may rely on the local build root
to get a proper tmp directory; ensure this is set properly to avoid
falling back to the user's home directory.

1 files changed, 16 insertions, 0 deletions

diff --git a/test/main.cpp b/test/main.cpp
index bb431de2..1c685447 100644
--- a/test/main.cpp
+++ b/test/main.cpp
@@ -12,8 +12,12 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+#include <cstdlib>
+#include <filesystem>
+
 #include "catch2/catch_session.hpp"
 #include "src/buildtool/file_system/git_context.hpp"
+#include "src/buildtool/storage/config.hpp"
 #include "test/utils/logging/log_config.hpp"
 
 auto main(int argc, char* argv[]) -> int {
@@ -27,5 +31,17 @@ auto main(int argc, char* argv[]) -> int {
      */
     GitContext::Create();
 
+    /**
+     * Test must not assume the existence of a home directory, nor write there.
+     * Hence we set the storage root to a fixed location under TEST_TMPDIR which
+     * is set by the test launcher.
+     */
+    auto setup_ok = StorageConfig::SetBuildRoot(
+        std::filesystem::path{std::string{std::getenv("TEST_TMPDIR")}} /
+        ".test_build_root");
+    if (not setup_ok) {
+        return 1;
+    }
+
     return Catch::Session().run(argc, argv);
 }