| /* |
| Copyright The containerd Authors. |
| |
| 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 |
| |
| 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 mount |
| |
| import ( |
| "encoding/json" |
| "path/filepath" |
| "strings" |
| |
| "github.com/Microsoft/hcsshim" |
| "github.com/pkg/errors" |
| ) |
| |
| var ( |
| // ErrNotImplementOnWindows is returned when an action is not implemented for windows |
| ErrNotImplementOnWindows = errors.New("not implemented under windows") |
| ) |
| |
| // Mount to the provided target |
| func (m *Mount) Mount(target string) error { |
| if m.Type != "windows-layer" { |
| return errors.Errorf("invalid windows mount type: '%s'", m.Type) |
| } |
| |
| home, layerID := filepath.Split(m.Source) |
| |
| parentLayerPaths, err := m.GetParentPaths() |
| if err != nil { |
| return err |
| } |
| |
| var di = hcsshim.DriverInfo{ |
| HomeDir: home, |
| } |
| |
| if err = hcsshim.ActivateLayer(di, layerID); err != nil { |
| return errors.Wrapf(err, "failed to activate layer %s", m.Source) |
| } |
| defer func() { |
| if err != nil { |
| hcsshim.DeactivateLayer(di, layerID) |
| } |
| }() |
| |
| if err = hcsshim.PrepareLayer(di, layerID, parentLayerPaths); err != nil { |
| return errors.Wrapf(err, "failed to prepare layer %s", m.Source) |
| } |
| return nil |
| } |
| |
| // ParentLayerPathsFlag is the options flag used to represent the JSON encoded |
| // list of parent layers required to use the layer |
| const ParentLayerPathsFlag = "parentLayerPaths=" |
| |
| // GetParentPaths of the mount |
| func (m *Mount) GetParentPaths() ([]string, error) { |
| var parentLayerPaths []string |
| for _, option := range m.Options { |
| if strings.HasPrefix(option, ParentLayerPathsFlag) { |
| err := json.Unmarshal([]byte(option[len(ParentLayerPathsFlag):]), &parentLayerPaths) |
| if err != nil { |
| return nil, errors.Wrap(err, "failed to unmarshal parent layer paths from mount") |
| } |
| } |
| } |
| return parentLayerPaths, nil |
| } |
| |
| // Unmount the mount at the provided path |
| func Unmount(mount string, flags int) error { |
| var ( |
| home, layerID = filepath.Split(mount) |
| di = hcsshim.DriverInfo{ |
| HomeDir: home, |
| } |
| ) |
| |
| if err := hcsshim.UnprepareLayer(di, layerID); err != nil { |
| return errors.Wrapf(err, "failed to unprepare layer %s", mount) |
| } |
| if err := hcsshim.DeactivateLayer(di, layerID); err != nil { |
| return errors.Wrapf(err, "failed to deactivate layer %s", mount) |
| } |
| |
| return nil |
| } |
| |
| // UnmountAll unmounts from the provided path |
| func UnmountAll(mount string, flags int) error { |
| return Unmount(mount, flags) |
| } |