e8ddf669f5
Previously remapping of a snapshotter has been done using
recursive chown.
Commit
31a6449734 added a support
for "remap-ids" capability which allows snapshotter internals do
remappings in case of idmapped mounts support to avoid recursive
chown and creating a new remapped snapshot.
Signed-off-by: Ilya Hanov <ilya.hanov@huawei-partners.com>
84 lines
2.3 KiB
Go
84 lines
2.3 KiB
Go
//go:build linux
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/*
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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 overlay
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import (
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"errors"
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"github.com/containerd/containerd/platforms"
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"github.com/containerd/containerd/plugin"
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"github.com/containerd/containerd/snapshots/overlay"
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"github.com/containerd/containerd/snapshots/overlay/overlayutils"
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)
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const (
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capaRemapIds = "remap-ids"
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)
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// Config represents configuration for the overlay plugin.
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type Config struct {
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// Root directory for the plugin
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RootPath string `toml:"root_path"`
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UpperdirLabel bool `toml:"upperdir_label"`
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SyncRemove bool `toml:"sync_remove"`
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// MountOptions are options used for the overlay mount (not used on bind mounts)
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MountOptions []string `toml:"mount_options"`
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}
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func init() {
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plugin.Register(&plugin.Registration{
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Type: plugin.SnapshotPlugin,
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ID: "overlayfs",
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Config: &Config{},
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InitFn: func(ic *plugin.InitContext) (interface{}, error) {
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ic.Meta.Platforms = append(ic.Meta.Platforms, platforms.DefaultSpec())
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config, ok := ic.Config.(*Config)
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if !ok {
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return nil, errors.New("invalid overlay configuration")
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}
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root := ic.Root
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if config.RootPath != "" {
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root = config.RootPath
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}
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var oOpts []overlay.Opt
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if config.UpperdirLabel {
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oOpts = append(oOpts, overlay.WithUpperdirLabel)
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}
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if !config.SyncRemove {
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oOpts = append(oOpts, overlay.AsynchronousRemove)
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}
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if len(config.MountOptions) > 0 {
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oOpts = append(oOpts, overlay.WithMountOptions(config.MountOptions))
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}
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if ok, err := overlayutils.SupportsIDMappedMounts(); err == nil && ok {
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oOpts = append(oOpts, overlay.WithRemapIds)
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ic.Meta.Capabilities = append(ic.Meta.Capabilities, capaRemapIds)
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}
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ic.Meta.Exports["root"] = root
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return overlay.NewSnapshotter(root, oOpts...)
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},
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})
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}
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