internal/pkg/netutil/tmp_test.go

// Copyright 2026 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package netutil

import (
	"os"
	"strings"
	"testing"

	_ "github.com/bazelbuild/rsclient/internal/pkg/testsetup"
)

func TestNewShortTempDir(t *testing.T) {
	td, err := NewShortTempDir("test-*")
	if err != nil {
		t.Fatalf("NewShortTempDir failed: %v", err)
	}

	// Verify path exists.
	if info, err := os.Stat(td.Path); err != nil {
		t.Errorf("Stat(%q) failed: %v", td.Path, err)
	} else if !info.IsDir() {
		t.Errorf("%q is not a directory", td.Path)
	}

	path := td.Path

	// Verify cleanup.
	if err := td.Close(); err != nil {
		t.Errorf("Close failed: %v", err)
	}

	if _, err := os.Stat(path); !os.IsNotExist(err) {
		t.Errorf("directory %q still exists after Close", path)
	}

	// Verify idempotency.
	if err := td.Close(); err != nil {
		t.Errorf("second Close failed: %v", err)
	}
}

func TestNewShortTempDir_Shortness(t *testing.T) {
	td, err := NewShortTempDir("short-*")
	if err != nil {
		t.Fatalf("NewShortTempDir failed: %v", err)
	}
	defer td.Close()

	// If we are on Linux, we expect /tmp to be used if writable.
	// We can't guarantee this in all environments, but we can verify
	// that the path length is within reasonable limits.
	if len(td.Path) > 100 {
		t.Errorf("temp dir path is suspiciously long (%d chars): %s", len(td.Path), td.Path)
	}

	// On most systems where /tmp is writable, it should be the prefix.
	if _, err := os.Stat("/tmp"); err == nil {
		if !strings.HasPrefix(td.Path, "/tmp") {
			t.Logf("Warning: /tmp exists but was not used as prefix for %s. This might be intentional in some environments.", td.Path)
		}
	}
}