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Add snapshot plugin type

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Update existing snapshot drivers to register as plugins.
Load snapshot driver at containerd startup.

Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)
This commit is contained in:
Derek McGowan 2017-03-07 14:55:36 -08:00
parent f06db40baf
commit a4247e2aa9
6 changed files with 91 additions and 15 deletions
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21
snapshot/btrfs/btrfs.go
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@ -10,17 +10,36 @@ import (
"strings"
"github.com/docker/containerd"
"github.com/docker/containerd/plugin"
"github.com/docker/containerd/snapshot"
"github.com/pkg/errors"
"github.com/stevvooe/go-btrfs"
)
type btrfsConfig struct {
Device string `toml:"device"`
}
func init() {
plugin.Register("snapshot-btrfs", &plugin.Registration{
Type: plugin.SnapshotPlugin,
Config: &btrfsConfig{},
Init: func(ic *plugin.InitContext) (interface{}, error) {
conf := ic.Config.(*btrfsConfig)
if conf.Device == "" {
return nil, errors.Errorf("btrfs requires \"device\" configuration")
}
return NewSnapshotter(conf.Device, filepath.Join(ic.Root, "snapshot", "btrfs"))
},
})
}
type Snapshotter struct {
device string // maybe we can resolve it with path?
root string // root provides paths for internal storage.
}
func NewSnapshotter(device, root string) (*Snapshotter, error) {
func NewSnapshotter(device, root string) (snapshot.Snapshotter, error) {
var (
active = filepath.Join(root, "active")
snapshots = filepath.Join(root, "snapshots")