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plugin.go
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plugin.go
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//go:build linux
// +build linux
/*
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 overlay
import (
"errors"
"github.com/containerd/containerd/platforms"
"github.com/containerd/containerd/plugin"
"github.com/containerd/containerd/snapshots/overlay"
)
// Config represents configuration for the overlay plugin.
type Config struct {
// Root directory for the plugin
RootPath string `toml:"root_path"`
UpperdirLabel bool `toml:"upperdir_label"`
SyncRemove bool `toml:"sync_remove"`
// MountOptions are options used for the overlay mount (not used on bind mounts)
MountOptions []string `toml:"mount_options"`
}
func init() {
plugin.Register(&plugin.Registration{
Type: plugin.SnapshotPlugin,
ID: "overlayfs",
Config: &Config{},
InitFn: func(ic *plugin.InitContext) (interface{}, error) {
ic.Meta.Platforms = append(ic.Meta.Platforms, platforms.DefaultSpec())
config, ok := ic.Config.(*Config)
if !ok {
return nil, errors.New("invalid overlay configuration")
}
root := ic.Root
if config.RootPath != "" {
root = config.RootPath
}
var oOpts []overlay.Opt
if config.UpperdirLabel {
oOpts = append(oOpts, overlay.WithUpperdirLabel)
}
if !config.SyncRemove {
oOpts = append(oOpts, overlay.AsynchronousRemove)
}
if len(config.MountOptions) > 0 {
oOpts = append(oOpts, overlay.WithMountOptions(config.MountOptions))
}
ic.Meta.Exports["root"] = root
return overlay.NewSnapshotter(root, oOpts...)
},
})
}