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c73c8e5d52
The EROFS differ only applies to EROFS layers which are marked by a special file `.erofslayer` generated by the EROFS snapshotter. Why it's needed? Since we'd like to parse []mount.Mount directly without actual mounting and convert OCI layers into EROFS blobs, `.erofslayer` gives a hint that the active snapshotter supports the output blob generated by the EROFS differ. I'd suggest it could be read together with the next commit. Signed-off-by: cardy.tang <zuniorone@gmail.com> Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
64 lines
1.8 KiB
Go
64 lines
1.8 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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"os/exec"
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"github.com/containerd/containerd/v2/core/metadata"
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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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"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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)
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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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}
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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) (interface{}, error) {
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_, err := exec.LookPath("mkfs.erofs")
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if err != nil {
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return nil, fmt.Errorf("could not find mkfs.erofs: %v: %w", err, 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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ic.Meta.Platforms = append(ic.Meta.Platforms, platforms.DefaultSpec())
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cs := md.(*metadata.DB).ContentStore()
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config := ic.Config.(*Config)
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return erofs.NewErofsDiffer(cs, config.MkfsOptions), nil
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},
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})
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}
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