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100 lines
2.6 KiB
100 lines
2.6 KiB
4 months ago
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// Copyright 2020 Google LLC
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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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// https://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 bind
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import (
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"fmt"
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"path/filepath"
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"syscall"
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"android.googlesource.com/platform/tools/treble.git/hacksaw/mount"
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)
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//localBinder executes PathBinder calls locally
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type localBinder struct {
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mounter mount.Mounter
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}
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func NewLocalPathBinder() PathBinder {
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var p localBinder
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p.mounter = mount.NewSystemMounter()
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return &p
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}
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func NewFakePathBinder() PathBinder {
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var p localBinder
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p.mounter = mount.NewFakeMounter()
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return &p
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}
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func (p localBinder) checkValidPath(inPath string) error {
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for dir := filepath.Dir(inPath); dir != "." && dir != "/"; dir = filepath.Dir(dir) {
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// Only allow mounts in hacksaw path
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if filepath.Base(dir) == "hacksaw" {
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return nil
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}
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}
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return fmt.Errorf("Not allowed to bind mount path %s because it's outside a hacksaw workspace", inPath)
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}
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func (p localBinder) BindReadOnly(source string, destination string) error {
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// TODO: check valid path considering sym links
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source, err := filepath.EvalSymlinks(source)
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if err != nil {
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return err
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}
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destination, err = filepath.EvalSymlinks(destination)
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if err != nil {
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return err
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}
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err = p.mounter.Mount(source, destination,
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"bind", syscall.MS_BIND, "")
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if err != nil {
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return err
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}
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err = p.mounter.Mount(source, destination,
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"bind", syscall.MS_REMOUNT|syscall.MS_BIND|syscall.MS_RDONLY, "")
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return err
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}
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func (p localBinder) BindReadWrite(source string, destination string) error {
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// TODO: check valid path considering sym links
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source, err := filepath.EvalSymlinks(source)
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if err != nil {
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return err
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}
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destination, err = filepath.EvalSymlinks(destination)
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if err != nil {
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return err
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}
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err = p.mounter.Mount(source, destination,
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"bind", syscall.MS_BIND, "")
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return err
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}
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func (p localBinder) Unbind(destination string) error {
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// TODO: check valid path considering sym links
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destination, err := filepath.EvalSymlinks(destination)
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if err != nil {
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return err
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}
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err = p.mounter.Unmount(destination, syscall.MNT_DETACH)
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return err
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}
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func (p localBinder) List() ([]string, error) {
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return p.mounter.List()
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}
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