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init.go
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/
init.go
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/*
* umoci: Umoci Modifies Open Containers' Images
* Copyright (C) 2016, 2017, 2018 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 (
"fmt"
"os"
"github.com/apex/log"
"github.com/openSUSE/umoci/oci/cas/dir"
"github.com/pkg/errors"
"github.com/urfave/cli"
)
var initCommand = cli.Command{
Name: "init",
Usage: "create a new OCI layout",
ArgsUsage: `--layout <image-path>
Where "<image-path>" is the path to the OCI image to be created.
The new OCI image does not contain any references or blobs, but those can be
created through the use of umoci-new(1), umoci-tag(1) and other similar
commands.`,
// create modifies an image layout.
Category: "layout",
Action: initLayout,
}
func initLayout(ctx *cli.Context) error {
imagePath := ctx.App.Metadata["--image-path"].(string)
if _, err := os.Stat(imagePath); !os.IsNotExist(err) {
if err == nil {
err = fmt.Errorf("path already exists: %s", imagePath)
}
return errors.Wrap(err, "image layout creation")
}
if err := dir.Create(imagePath); err != nil {
return errors.Wrap(err, "image layout creation")
}
log.Infof("created new OCI image: %s", imagePath)
return nil
}