| // Licensed to the Apache Software Foundation (ASF) under one or more |
| // contributor license agreements. See the NOTICE file distributed with |
| // this work for additional information regarding copyright ownership. |
| // The ASF licenses this file to You 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 filelock |
| |
| import ( |
| "context" |
| "fmt" |
| "os" |
| ) |
| |
| import ( |
| "github.com/apache/dubbo-kubernetes/pkg/bufman/pkg/normalpath" |
| ) |
| |
| type locker struct { |
| rootDirPath string |
| } |
| |
| func newLocker(rootDirPath string) (*locker, error) { |
| // allow symlinks |
| fileInfo, err := os.Stat(normalpath.Unnormalize(rootDirPath)) |
| if err != nil { |
| return nil, err |
| } |
| if !fileInfo.IsDir() { |
| return nil, fmt.Errorf("%q is not a directory", rootDirPath) |
| } |
| return &locker{ |
| // do not validate - allow anything including absolute paths and jumping context |
| rootDirPath: normalpath.Normalize(rootDirPath), |
| }, nil |
| } |
| |
| func (l *locker) Lock(ctx context.Context, path string, options ...LockOption) (Unlocker, error) { |
| if err := validatePath(path); err != nil { |
| return nil, err |
| } |
| return lock( |
| ctx, |
| normalpath.Unnormalize(normalpath.Join(l.rootDirPath, path)), |
| options..., |
| ) |
| } |
| |
| func (l *locker) RLock(ctx context.Context, path string, options ...LockOption) (Unlocker, error) { |
| if err := validatePath(path); err != nil { |
| return nil, err |
| } |
| return rlock( |
| ctx, |
| normalpath.Unnormalize(normalpath.Join(l.rootDirPath, path)), |
| options..., |
| ) |
| } |
| |
| func validatePath(path string) error { |
| normalPath, err := normalpath.NormalizeAndValidate(path) |
| if err != nil { |
| return err |
| } |
| if path != normalPath { |
| // just extra safety |
| return fmt.Errorf("expected file lock path %q to be equal to normalized path %q", path, normalPath) |
| } |
| return nil |
| } |