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gc.go
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gc.go
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/*
* umoci: Umoci Modifies Open Containers' Images
* Copyright (C) 2016, 2017 SUSE LLC.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package main
import (
"github.com/openSUSE/umoci/oci/cas"
"github.com/openSUSE/umoci/oci/casext"
"github.com/pkg/errors"
"github.com/urfave/cli"
"golang.org/x/net/context"
)
var gcCommand = cli.Command{
Name: "gc",
Usage: "garbage-collects an OCI image's blobs",
ArgsUsage: `--layout <image-path>
Where "<image-path>" is the path to the OCI image.
This command will do a mark-and-sweep garbage collection of the provided OCI
image, only retaining blobs which can be reached by a descriptor path from the
root set of references. All other blobs will be removed.`,
// create modifies an image layout.
Category: "layout",
Before: func(ctx *cli.Context) error {
if _, ok := ctx.App.Metadata["--image-path"]; !ok {
return errors.Errorf("missing mandatory argument: --layout")
}
return nil
},
Action: gc,
}
func gc(ctx *cli.Context) error {
imagePath := ctx.App.Metadata["--image-path"].(string)
// Get a reference to the CAS.
engine, err := cas.Open(imagePath)
if err != nil {
return errors.Wrap(err, "open CAS")
}
engineExt := casext.Engine{engine}
defer engine.Close()
// Run the GC.
return errors.Wrap(engineExt.GC(context.Background()), "gc")
}