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