github.com/Lephar/snapd@v0.0.0-20210825215435-c7fba9cef4d2/testutil/filepresencechecker.go (about) 1 // -*- Mode: Go; indent-tabs-mode: t -*- 2 3 /* 4 * Copyright (C) 2015-2018 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 testutil 21 22 import ( 23 "fmt" 24 "os" 25 26 "gopkg.in/check.v1" 27 ) 28 29 type filePresenceChecker struct { 30 *check.CheckerInfo 31 present bool 32 } 33 34 // FilePresent verifies that the given file exists. 35 var FilePresent check.Checker = &filePresenceChecker{ 36 CheckerInfo: &check.CheckerInfo{Name: "FilePresent", Params: []string{"filename"}}, 37 present: true, 38 } 39 40 // FileAbsent verifies that the given file does not exist. 41 var FileAbsent check.Checker = &filePresenceChecker{ 42 CheckerInfo: &check.CheckerInfo{Name: "FileAbsent", Params: []string{"filename"}}, 43 present: false, 44 } 45 46 func (c *filePresenceChecker) Check(params []interface{}, names []string) (result bool, error string) { 47 filename, ok := params[0].(string) 48 if !ok { 49 return false, "filename must be a string" 50 } 51 _, err := os.Stat(filename) 52 if os.IsNotExist(err) && c.present { 53 return false, fmt.Sprintf("file %q is absent but should exist", filename) 54 } 55 if err == nil && !c.present { 56 return false, fmt.Sprintf("file %q is present but should not exist", filename) 57 } 58 return true, "" 59 }