github.com/meulengracht/snapd@v0.0.0-20210719210640-8bde69bcc84e/boot/errors.go (about) 1 // -*- Mode: Go; indent-tabs-mode: t -*- 2 3 /* 4 * Copyright (C) 2020 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 boot 21 22 import ( 23 "errors" 24 "fmt" 25 ) 26 27 // trySnapError is an error that only applies to the try snaps where multiple 28 // snaps are returned, this is mainly and primarily used in revisions(). 29 type trySnapError string 30 31 func (sre trySnapError) Error() string { 32 return string(sre) 33 } 34 35 func newTrySnapErrorf(format string, args ...interface{}) error { 36 return trySnapError(fmt.Sprintf(format, args...)) 37 } 38 39 // isTrySnapError returns true if the given error is an error resulting from 40 // accessing information about the try snap or the trying status. 41 func isTrySnapError(err error) bool { 42 switch err.(type) { 43 case trySnapError: 44 return true 45 } 46 return false 47 } 48 49 var errTrySnapFallback = errors.New("fallback to original snap")