ripplehang commented on code in PR #43601:
URL: https://github.com/apache/arrow/pull/43601#discussion_r1778367486


##########
cpp/src/arrow/filesystem/s3_test_util.cc:
##########
@@ -91,9 +121,21 @@ Status MinioTestServer::Start() {
   impl_->connect_string_ = GenerateConnectString();
   
ARROW_RETURN_NOT_OK(impl_->server_process_->SetExecutable(kMinioExecutableName));
   // NOTE: --quiet makes startup faster by suppressing remote version check
-  impl_->server_process_->SetArgs({"server", "--quiet", "--compat", 
"--address",
-                                   impl_->connect_string_,
-                                   impl_->temp_dir_->path().ToString()});
+  std::vector<std::string> start_args = {"server", "--quiet", "--compat", 
"--address",
+                                         impl_->connect_string_};
+
+  // create the dedicated folder for certificate file, rather than reuse the 
data
+  // folder, since there is test case to check whether the folder is empty.
+  ARROW_ASSIGN_OR_RAISE(impl_->temp_dir_ca_, 
TemporaryDir::Make("s3fs-test-ca-"));
+  GenerateCertificateFile();
+  start_args.push_back("--certs-dir");
+  start_args.push_back(ca_path());
+  arrow::fs::FileSystemGlobalOptions global_options;
+  global_options.tls_ca_dir_path = ca_path();
+  ARROW_RETURN_NOT_OK(arrow::fs::Initialize(global_options));
+  // apply the data path at the end since some minio version only support it 
at the end
+  start_args.push_back(impl_->temp_dir_->path().ToString());
+  impl_->server_process_->SetArgs(start_args);

Review Comment:
   ok, I would refine here., the previous implement was caused by handling with 
the tls flag, since we decided to use tls for all the cases, we could refine 
here. 



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