mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-12-24 05:50:22 +00:00
79 lines
2.1 KiB
Go
79 lines
2.1 KiB
Go
|
/*
|
||
|
|
Copyright 2017 The Kubernetes Authors.
|
||
|
|
|
||
|
|
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 path
|
||
|
|
|
||
|
|
import (
|
||
|
|
"errors"
|
||
|
|
"os"
|
||
|
|
)
|
||
|
|
|
||
|
|
// LinkTreatment is the base type for constants used by Exists that indicate
|
||
|
|
// how symlinks are treated for existence checks.
|
||
|
|
type LinkTreatment int
|
||
|
|
|
||
|
|
const (
|
||
|
|
// CheckFollowSymlink follows the symlink and verifies that the target of
|
||
|
|
// the symlink exists.
|
||
|
|
CheckFollowSymlink LinkTreatment = iota
|
||
|
|
|
||
|
|
// CheckSymlinkOnly does not follow the symlink and verfies only that they
|
||
|
|
// symlink itself exists.
|
||
|
|
CheckSymlinkOnly
|
||
|
|
)
|
||
|
|
|
||
|
|
// ErrInvalidLinkTreatment indicates that the link treatment behavior requested
|
||
|
|
// is not a valid behavior.
|
||
|
|
var ErrInvalidLinkTreatment = errors.New("unknown link behavior")
|
||
|
|
|
||
|
|
// Exists checks if specified file, directory, or symlink exists. The behavior
|
||
|
|
// of the test depends on the linkBehaviour argument. See LinkTreatment for
|
||
|
|
// more details.
|
||
|
|
func Exists(linkBehavior LinkTreatment, filename string) (bool, error) {
|
||
|
|
var err error
|
||
|
|
|
||
|
|
if linkBehavior == CheckFollowSymlink {
|
||
|
|
_, err = os.Stat(filename)
|
||
|
|
} else if linkBehavior == CheckSymlinkOnly {
|
||
|
|
_, err = os.Lstat(filename)
|
||
|
|
} else {
|
||
|
|
return false, ErrInvalidLinkTreatment
|
||
|
|
}
|
||
|
|
|
||
|
|
if os.IsNotExist(err) {
|
||
|
|
return false, nil
|
||
|
|
} else if err != nil {
|
||
|
|
return false, err
|
||
|
|
}
|
||
|
|
return true, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// ReadDirNoStat returns a string of files/directories contained
|
||
|
|
// in dirname without calling lstat on them.
|
||
|
|
func ReadDirNoStat(dirname string) ([]string, error) {
|
||
|
|
if dirname == "" {
|
||
|
|
dirname = "."
|
||
|
|
}
|
||
|
|
|
||
|
|
f, err := os.Open(dirname)
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
defer f.Close()
|
||
|
|
|
||
|
|
return f.Readdirnames(-1)
|
||
|
|
}
|