package dockerfile // import "github.com/docker/docker/builder/dockerfile" import ( "io/ioutil" "os" "path/filepath" "testing" ) // createTestTempDir creates a temporary directory for testing. // It returns the created path and a cleanup function which is meant to be used as deferred call. // When an error occurs, it terminates the test. func createTestTempDir(t *testing.T, dir, prefix string) (string, func()) { path, err := ioutil.TempDir(dir, prefix) if err != nil { t.Fatalf("Error when creating directory %s with prefix %s: %s", dir, prefix, err) } return path, func() { err = os.RemoveAll(path) if err != nil { t.Fatalf("Error when removing directory %s: %s", path, err) } } } // createTestTempFile creates a temporary file within dir with specific contents and permissions. // When an error occurs, it terminates the test func createTestTempFile(t *testing.T, dir, filename, contents string, perm os.FileMode) string { filePath := filepath.Join(dir, filename) err := ioutil.WriteFile(filePath, []byte(contents), perm) if err != nil { t.Fatalf("Error when creating %s file: %s", filename, err) } return filePath } // createTestSymlink creates a symlink file within dir which points to oldname func createTestSymlink(t *testing.T, dir, filename, oldname string) string { filePath := filepath.Join(dir, filename) if err := os.Symlink(oldname, filePath); err != nil { t.Fatalf("Error when creating %s symlink to %s: %s", filename, oldname, err) } return filePath }