1 /* 2 Copyright The containerd Authors. 3 4 Licensed under the Apache License, Version 2.0 (the "License"); 5 you may not use this file except in compliance with the License. 6 You may obtain a copy of the License at 7 8 http://www.apache.org/licenses/LICENSE-2.0 9 10 Unless required by applicable law or agreed to in writing, software 11 distributed under the License is distributed on an "AS IS" BASIS, 12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 See the License for the specific language governing permissions and 14 limitations under the License. 15 */ 16 17 package errorutil 18 19 import ( 20 "errors" 21 "fmt" 22 "strings" 23 ) 24 25 // Aggregate combines a list of errors into a single new error. 26 func Aggregate(errs []error) error { 27 switch len(errs) { 28 case 0: 29 return nil 30 case 1: 31 return errs[0] 32 default: 33 points := make([]string, len(errs)+1) 34 points[0] = fmt.Sprintf("%d error(s) occurred:", len(errs)) 35 for i, err := range errs { 36 points[i+1] = fmt.Sprintf("* %s", err) 37 } 38 return errors.New(strings.Join(points, "\n\t")) 39 } 40 } 41