1 // Copyright 2014 Google Inc. All Rights Reserved. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package driver 16 17 import ( 18 "fmt" 19 "os" 20 "path/filepath" 21 "sync" 22 ) 23 24 // newTempFile returns a new output file in dir with the provided prefix and suffix. 25 func newTempFile(dir, prefix, suffix string) (*os.File, error) { 26 for index := 1; index < 10000; index++ { 27 path := filepath.Join(dir, fmt.Sprintf("%s%03d%s", prefix, index, suffix)) 28 if _, err := os.Stat(path); err != nil { 29 return os.Create(path) 30 } 31 } 32 // Give up 33 return nil, fmt.Errorf("could not create file of the form %s%03d%s", prefix, 1, suffix) 34 } 35 36 var tempFiles []string 37 var tempFilesMu = sync.Mutex{} 38 39 // deferDeleteTempFile marks a file to be deleted by next call to Cleanup() 40 func deferDeleteTempFile(path string) { 41 tempFilesMu.Lock() 42 tempFiles = append(tempFiles, path) 43 tempFilesMu.Unlock() 44 } 45 46 // cleanupTempFiles removes any temporary files selected for deferred cleaning. 47 func cleanupTempFiles() { 48 tempFilesMu.Lock() 49 for _, f := range tempFiles { 50 os.Remove(f) 51 } 52 tempFiles = nil 53 tempFilesMu.Unlock() 54 } 55
