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cb93966b9f
If no snapshotter is specified and `os.features` contains "erofs", unpacking should use the EROFS snapshotter and differ. This enhances the usability of native EROFS container images. Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
103 lines
3.1 KiB
Go
103 lines
3.1 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 plugin
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import (
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"fmt"
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"github.com/containerd/platforms"
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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/internal/dmverity"
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"github.com/containerd/containerd/v2/internal/erofsutils"
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"github.com/containerd/containerd/v2/plugins"
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"github.com/containerd/containerd/v2/plugins/diff/erofs"
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)
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// Config represents configuration for the erofs plugin.
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type Config struct {
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// MkfsOptions are extra options used for the applier
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MkfsOptions []string `toml:"mkfs_options"`
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// EnableTarIndex enables the tar index mode where the index is generated
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// for tar content without extracting the tar
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EnableTarIndex bool `toml:"enable_tar_index"`
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// EnableDmverity enables dm-verity formatting for EROFS layers
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// Linux only
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EnableDmverity bool `toml:"enable_dmverity"`
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}
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func init() {
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registry.Register(&plugin.Registration{
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Type: plugins.DiffPlugin,
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ID: "erofs",
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Requires: []plugin.Type{
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plugins.MetadataPlugin,
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},
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Config: &Config{},
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InitFn: func(ic *plugin.InitContext) (any, error) {
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tarModeSupported, err := erofsutils.SupportGenerateFromTar()
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if err != nil {
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return nil, fmt.Errorf("failed to check mkfs.erofs availability: %v: %w", err, plugin.ErrSkipPlugin)
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}
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if !tarModeSupported {
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return nil, fmt.Errorf("mkfs.erofs does not support tar mode (--tar option), disabling erofs differ: %w", plugin.ErrSkipPlugin)
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}
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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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p := platforms.DefaultSpec()
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p.OS = "linux"
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ic.Meta.Platforms = append(ic.Meta.Platforms, p)
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// Select this differ for EROFS native images by default
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p.OSFeatures = []string{"erofs"}
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ic.Meta.Platforms = append(ic.Meta.Platforms, p)
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cs := md.(*metadata.DB).ContentStore()
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config := ic.Config.(*Config)
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var opts []erofs.DifferOpt
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if len(config.MkfsOptions) > 0 {
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opts = append(opts, erofs.WithMkfsOptions(config.MkfsOptions))
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}
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if config.EnableTarIndex {
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opts = append(opts, erofs.WithTarIndexMode())
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}
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if config.EnableDmverity {
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supported, err := dmverity.IsSupported()
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if err != nil {
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return nil, fmt.Errorf("dm-verity support check failed: %w", err)
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}
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if !supported {
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return nil, fmt.Errorf("dm-verity is not supported on this system (dm_verity module not loaded): %w", plugin.ErrSkipPlugin)
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}
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opts = append(opts, erofs.WithDmverity())
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}
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return erofs.NewErofsDiffer(cs, opts...), nil
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},
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})
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}
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