mirror of
https://github.com/containerd/containerd.git
synced 2026-08-10 17:14:49 +00:00
109 lines
2.9 KiB
Go
109 lines
2.9 KiB
Go
/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package mount
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import (
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"context"
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"errors"
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"fmt"
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"os"
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"path/filepath"
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bolt "go.etcd.io/bbolt"
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"github.com/containerd/log"
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"github.com/containerd/plugin"
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"github.com/containerd/plugin/registry"
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"github.com/containerd/containerd/v2/core/metadata"
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"github.com/containerd/containerd/v2/core/metadata/boltutil"
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"github.com/containerd/containerd/v2/core/mount"
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"github.com/containerd/containerd/v2/core/mount/manager"
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"github.com/containerd/containerd/v2/plugins"
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)
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func init() {
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registry.Register(&plugin.Registration{
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Type: plugins.MountManagerPlugin,
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ID: "bolt",
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Requires: []plugin.Type{
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plugins.MetadataPlugin,
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plugins.MountHandlerPlugin,
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},
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InitFn: func(ic *plugin.InitContext) (interface{}, error) {
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md, err := ic.GetSingle(plugins.MetadataPlugin)
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if err != nil {
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return nil, err
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}
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hp, err := ic.GetByType(plugins.MountHandlerPlugin)
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if err != nil && !errors.Is(err, plugin.ErrPluginNotFound) {
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return nil, err
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}
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handlers := make(map[string]mount.Handler, len(hp))
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for k, v := range hp {
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handlers[k] = v.(mount.Handler)
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}
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root := ic.Properties[plugins.PropertyStateDir]
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// TODO: Allow overriding root and target directory from config
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targets := filepath.Join(root, "t")
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if merr := os.MkdirAll(targets, 0700); merr != nil {
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return nil, merr
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}
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metadb := filepath.Join(root, "mounts.db")
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db, err := bolt.Open(metadb, 0600, nil)
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if err != nil {
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return nil, fmt.Errorf("failed to open database file: %w", err)
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}
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mm := manager.NewManager(db, targets, handlers)
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//TODO: IF has sync
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if sync, ok := mm.(interface{ Sync(context.Context) error }); ok {
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// Start transaction and then background sync with mount state,
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// ensure startup waits until ready to continue
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tx, err := db.Begin(true)
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if err != nil {
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return nil, fmt.Errorf("failed to open database for write: %w", err)
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}
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ctx := boltutil.WithTransaction(ic.Context, tx)
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ready := ic.RegisterReadiness()
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go func() {
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defer ready()
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if err := sync.Sync(ctx); err == nil {
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tx.Commit()
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} else {
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log.G(ctx).WithError(err).Errorf("failed to sync mounts")
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tx.Rollback()
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}
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}()
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}
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if collector, ok := mm.(metadata.Collector); ok {
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md.(*metadata.DB).RegisterCollectibleResource(metadata.ResourceMount, collector)
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}
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return mm, nil
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},
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})
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}
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