77 lines
2.0 KiB
Go
77 lines
2.0 KiB
Go
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// Copyright 2020-2021 Buf Technologies, Inc.
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package filelock
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import (
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"context"
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"fmt"
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"os"
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"github.com/bufbuild/buf/internal/pkg/normalpath"
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)
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type locker struct {
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rootDirPath string
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}
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func newLocker(rootDirPath string) (*locker, error) {
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// allow symlinks
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fileInfo, err := os.Stat(normalpath.Unnormalize(rootDirPath))
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if err != nil {
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return nil, err
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}
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if !fileInfo.IsDir() {
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return nil, fmt.Errorf("%q is not a directory", rootDirPath)
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}
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return &locker{
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// do not validate - allow anything including absolute paths and jumping context
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rootDirPath: normalpath.Normalize(rootDirPath),
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}, nil
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}
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func (l *locker) Lock(ctx context.Context, path string, options ...LockOption) (Unlocker, error) {
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if err := validatePath(path); err != nil {
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return nil, err
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}
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return lock(
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ctx,
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normalpath.Unnormalize(normalpath.Join(l.rootDirPath, path)),
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options...,
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)
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}
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func (l *locker) RLock(ctx context.Context, path string, options ...LockOption) (Unlocker, error) {
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if err := validatePath(path); err != nil {
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return nil, err
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}
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return rlock(
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ctx,
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normalpath.Unnormalize(normalpath.Join(l.rootDirPath, path)),
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options...,
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)
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}
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func validatePath(path string) error {
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normalPath, err := normalpath.NormalizeAndValidate(path)
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if err != nil {
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return err
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}
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if path != normalPath {
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// just extra safety
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return fmt.Errorf("expected file lock path %q to be equal to normalized path %q", path, normalPath)
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}
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return nil
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}
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