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// Copyright 2018 Google LLC All Rights Reserved.
//
// 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 tarball_test
import (
"errors"
"fmt"
"io"
"os"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/google/go-containerregistry/pkg/v1/tarball"
)
func ExampleWithProgress() {
// buffered channel to make the example test easier
c := make(chan v1.Update, 200)
// Make a tempfile for tarball writes.
fp, err := os.CreateTemp("", "")
if err != nil {
fmt.Printf("error creating temp file: %v\n", err)
return
}
defer fp.Close()
defer os.Remove(fp.Name())
img, err := tarball.ImageFromPath("testdata/test_image_1.tar", nil)
go func() {
_ = tarball.WriteToFile(fp.Name(), nil, img, tarball.WithProgress(c))
}()
for update := range c {
switch {
case update.Error != nil && errors.Is(update.Error, io.EOF):
fmt.Fprintf(os.Stderr, "receive error message: %v\n", err)
fmt.Printf("%d/%d", update.Complete, update.Total)
// Output: 4096/4096
return
case update.Error != nil:
fmt.Printf("error writing tarball: %v\n", update.Error)
return
default:
fmt.Fprintf(os.Stderr, "receive update: %#v\n", update)
}
}
}
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