mirror of https://github.com/k3s-io/k3s
109 lines
2.6 KiB
Go
109 lines
2.6 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package removeall
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import (
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"fmt"
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"io"
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"os"
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"syscall"
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"k8s.io/utils/mount"
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)
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// RemoveAllOneFilesystem removes path and any children it contains.
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// It removes everything it can but returns the first error
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// it encounters. If the path does not exist, RemoveAll
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// returns nil (no error).
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// It makes sure it does not cross mount boundary, i.e. it does *not* remove
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// files from another filesystems. Like 'rm -rf --one-file-system'.
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// It is copied from RemoveAll() sources, with IsLikelyNotMountPoint
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func RemoveAllOneFilesystem(mounter mount.Interface, path string) error {
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// Simple case: if Remove works, we're done.
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err := os.Remove(path)
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if err == nil || os.IsNotExist(err) {
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return nil
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}
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// Otherwise, is this a directory we need to recurse into?
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dir, serr := os.Lstat(path)
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if serr != nil {
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if serr, ok := serr.(*os.PathError); ok && (os.IsNotExist(serr.Err) || serr.Err == syscall.ENOTDIR) {
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return nil
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}
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return serr
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}
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if !dir.IsDir() {
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// Not a directory; return the error from Remove.
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return err
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}
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// Directory.
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isNotMount, err := mounter.IsLikelyNotMountPoint(path)
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if err != nil {
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return err
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}
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if !isNotMount {
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return fmt.Errorf("cannot delete directory %s: it is a mount point", path)
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}
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fd, err := os.Open(path)
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if err != nil {
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if os.IsNotExist(err) {
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// Race. It was deleted between the Lstat and Open.
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// Return nil per RemoveAll's docs.
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return nil
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}
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return err
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}
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// Remove contents & return first error.
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err = nil
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for {
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names, err1 := fd.Readdirnames(100)
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for _, name := range names {
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err1 := RemoveAllOneFilesystem(mounter, path+string(os.PathSeparator)+name)
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if err == nil {
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err = err1
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}
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}
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if err1 == io.EOF {
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break
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}
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// If Readdirnames returned an error, use it.
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if err == nil {
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err = err1
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}
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if len(names) == 0 {
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break
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}
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}
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// Close directory, because windows won't remove opened directory.
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fd.Close()
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// Remove directory.
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err1 := os.Remove(path)
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if err1 == nil || os.IsNotExist(err1) {
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return nil
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}
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if err == nil {
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err = err1
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}
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return err
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}
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