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plugin.go
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plugin.go
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/*
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 plugin
import (
"errors"
"github.com/containerd/containerd/platforms"
"github.com/containerd/containerd/plugin"
"github.com/containerd/containerd/snapshots/blockfile"
)
// Config represents configuration for the native plugin.
type Config struct {
// Root directory for the plugin
RootPath string `toml:"root_path"`
// ScratchFile is the scratch block file to use as an empty block
ScratchFile string `toml:"scratch_file"`
// FSType is the filesystem type for the mount
FSType string `toml:"fs_type"`
// MountOptions are options used for the mount
MountOptions []string `toml:"mount_options"`
}
func init() {
plugin.Register(&plugin.Registration{
Type: plugin.SnapshotPlugin,
ID: "blockfile",
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 blockfile configuration")
}
var opts []blockfile.Opt
root := ic.Root
if len(config.RootPath) != 0 {
root = config.RootPath
}
if config.ScratchFile != "" {
opts = append(opts, blockfile.WithScratchFile(config.ScratchFile))
}
if config.FSType != "" {
opts = append(opts, blockfile.WithFSType(config.FSType))
}
if len(config.MountOptions) > 0 {
opts = append(opts, blockfile.WithMountOptions(config.MountOptions))
}
ic.Meta.Exports[plugin.SnapshotterRootDir] = root
return blockfile.NewSnapshotter(root, opts...)
},
})
}