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stat.go
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stat.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 (
"encoding/json"
"fmt"
"os"
"github.com/openSUSE/umoci/oci/cas"
"github.com/openSUSE/umoci/oci/casext"
ispec "github.com/opencontainers/image-spec/specs-go/v1"
"github.com/pkg/errors"
"github.com/urfave/cli"
"golang.org/x/net/context"
)
var statCommand = cli.Command{
Name: "stat",
Usage: "displays status information of an image manifest",
ArgsUsage: `--image <image-path>[:<tag>]
Where "<image-path>" is the path to the OCI image, and "<tag>" is the name of
the tagged image to stat.
WARNING: Do not depend on the output of this tool unless you're using --json.
The intention of the default formatting of this tool is that it is easy for
humans to read, and might change in future versions.`,
// stat gives information about a manifest.
Category: "image",
Flags: []cli.Flag{
cli.BoolFlag{
Name: "json",
Usage: "output the stat information as a JSON encoded blob",
},
},
Action: stat,
}
func stat(ctx *cli.Context) error {
imagePath := ctx.App.Metadata["--image-path"].(string)
tagName := ctx.App.Metadata["--image-tag"].(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()
manifestDescriptor, err := engine.GetReference(context.Background(), tagName)
if err != nil {
return errors.Wrap(err, "get reference")
}
// FIXME: Implement support for manifest lists.
if manifestDescriptor.MediaType != ispec.MediaTypeImageManifest {
return errors.Wrap(fmt.Errorf("descriptor does not point to ispec.MediaTypeImageManifest: not implemented: %s", manifestDescriptor.MediaType), "invalid saved from descriptor")
}
// Get stat information.
ms, err := Stat(context.Background(), engineExt, manifestDescriptor)
if err != nil {
return errors.Wrap(err, "stat")
}
// Output the stat information.
if ctx.Bool("json") {
// Use JSON.
if err := json.NewEncoder(os.Stdout).Encode(ms); err != nil {
return errors.Wrap(err, "encoding stat")
}
} else {
if err := ms.Format(os.Stdout); err != nil {
return errors.Wrap(err, "format stat")
}
}
return nil
}