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// Copyright 2014 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package driver
import (
"fmt"
"os"
"path/filepath"
"sync"
)
// newTempFile returns a new output file in dir with the provided prefix and suffix.
func newTempFile(dir, prefix, suffix string) (*os.File, error) {
for index := 1; index < 10000; index++ {
switch f, err := os.OpenFile(filepath.Join(dir, fmt.Sprintf("%s%03d%s", prefix, index, suffix)), os.O_RDWR|os.O_CREATE|os.O_EXCL, 0666); {
case err == nil:
return f, nil
case !os.IsExist(err):
return nil, err
}
}
// Give up
return nil, fmt.Errorf("could not create file of the form %s%03d%s", prefix, 1, suffix)
}
var tempFiles []string
var tempFilesMu = sync.Mutex{}
// deferDeleteTempFile marks a file to be deleted by next call to Cleanup()
func deferDeleteTempFile(path string) {
tempFilesMu.Lock()
tempFiles = append(tempFiles, path)
tempFilesMu.Unlock()
}
// cleanupTempFiles removes any temporary files selected for deferred cleaning.
func cleanupTempFiles() error {
tempFilesMu.Lock()
defer tempFilesMu.Unlock()
var lastErr error
for _, f := range tempFiles {
if err := os.Remove(f); err != nil {
lastErr = err
}
}
tempFiles = nil
return lastErr
}
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