.

Author: argmarco-tkd

cpp/src/parquet/encryption/external/test_utils.cc

@@ -58,6 +58,21 @@ std::string TestUtils::GetExecutableDirectory() {
 }
 
 std::string TestUtils::GetTestLibraryPath() {
+  // Strong override: reuse the same env var as the Python tooling
+  // (`python/scripts/base_app.py`): DBPA_LIBRARY_PATH.
+  //
+  // This allows CI/build systems to provide the exact path to the DBPA agent shared
+  // library, avoiding reliance on executable-path heuristics or current working directory.
+  const char* explicit_path = std::getenv("DBPA_LIBRARY_PATH");
+  if (explicit_path && explicit_path[0]) {
+    std::string p(explicit_path);
+    if (std::filesystem::exists(p)) {
+      return p;
+    }
+    throw std::runtime_error("DBPA_LIBRARY_PATH is set but the file does not exist: " +
+                             p);
+  }
+
   // Check for environment variable to override the executable directory
   const char* cwd_override = std::getenv("PARQUET_TEST_LIBRARY_CWD");
   std::string base_path;

cpp/src/parquet/meson.build

@@ -93,6 +93,7 @@ parquet_deps = [arrow_dep, rapidjson_dep, thrift_dep]
 
 # Default to no DBPA test-agent library (only built when encryption+testing are enabled).
 dbpa_test_agent_lib = disabler()
+dbpa_test_agent_path = ''
 
 if needs_parquet_encryption or get_option('parquet_require_encryption').auto()
     openssl_dep = dependency('openssl', required: needs_parquet_encryption)
@@ -175,6 +176,7 @@ if openssl_dep.found()
                 install: false,
                 gnu_symbol_visibility: 'default',
             )
+            dbpa_test_agent_path = dbpa_test_agent_lib.full_path()
         endif
     endif
 else
@@ -397,6 +399,9 @@ foreach key, val : parquet_tests
             # Make DBPATestAgent lookup deterministic under Meson. Some CI setups may
             # not allow /proc/self/exe resolution or run tests with unexpected cwd.
             'PARQUET_TEST_LIBRARY_CWD': meson.current_build_dir(),
+            # Reuse the standard env var used by Python tooling (`base_app.py`).
+            # Prefer this in C++ as well.
+            'DBPA_LIBRARY_PATH': dbpa_test_agent_path,
         },
     )
 endforeach