github.com/hugh712/snapd@v0.0.0-20200910133618-1a99902bd583/osutil/outputerr.go (about) 1 // -*- Mode: Go; indent-tabs-mode: t -*- 2 3 /* 4 * Copyright (C) 2016 Canonical Ltd 5 * 6 * This program is free software: you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 3 as 8 * published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program. If not, see <http://www.gnu.org/licenses/>. 17 * 18 */ 19 20 package osutil 21 22 import ( 23 "bytes" 24 "fmt" 25 ) 26 27 // OutputErr formats an error based on output if its length is not zero, 28 // or returns err otherwise. 29 func OutputErr(output []byte, err error) error { 30 output = bytes.TrimSpace(output) 31 if len(output) > 0 { 32 if bytes.Contains(output, []byte{'\n'}) { 33 err = fmt.Errorf("\n-----\n%s\n-----", output) 34 } else { 35 err = fmt.Errorf("%s", output) 36 } 37 } 38 return err 39 }