Make config keep the absolute root to load relative files from

This means Config::get_path will continue to work even if we change
current directory in the process (when the path the config was loaded
from was relative).

1 files changed, 10 insertions, 0 deletions

diff --git a/test/test_config.cc b/test/test_config.cc
index d9ddf3a..bcb7b59 100644
--- a/test/test_config.cc
+++ b/test/test_config.cc
@@ -165,3 +165,13 @@ TEST_F(ConfigTest, path) {
   EXPECT_EQ("/file", cfg->get_path("absolute", ""));
   EXPECT_EQ(path().parent_path() / "file", cfg->get_path("relative", ""));
 }
+
+TEST_F(ConfigTest, path_when_load_relative) {
+  write("absolute = /file\n"
+        "relative = file\n");
+  auto cfg = Config::create(logger(), std::filesystem::relative(path()));
+  ASSERT_TRUE(cfg);
+  EXPECT_EQ("/file", cfg->get_path("absolute", ""));
+  EXPECT_EQ(path().parent_path() / "file",
+            std::filesystem::weakly_canonical(cfg->get_path("relative", "")));
+}