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minio/cmd/disk-cache-check-support_ot...

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// +build !windows
/*
* MinIO Cloud Storage, (C) 2019-2020 MinIO, Inc.
*
* 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 cmd
import (
"errors"
"io"
"io/ioutil"
"os"
"time"
"github.com/djherbis/atime"
)
// Return error if Atime is disabled on the O/S
func checkAtimeSupport(dir string) (err error) {
file, err := ioutil.TempFile(dir, "prefix")
if err != nil {
return
}
defer os.Remove(file.Name())
defer file.Close()
finfo1, err := os.Stat(file.Name())
if err != nil {
return
}
// add a sleep to ensure atime change is detected
time.Sleep(10 * time.Millisecond)
if _, err = io.Copy(ioutil.Discard, file); err != nil {
return
}
finfo2, err := os.Stat(file.Name())
if atime.Get(finfo2).Equal(atime.Get(finfo1)) {
return errors.New("Atime not supported")
}
return
}