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Split tarball progress test from write_test.go (#756)
This example test reaches out to the internet, which isn't ideal. For now, I'm just going to split it off into a separate file so it's easier to exclude. Also, fix some whitespace nits.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,89 @@ | ||
| // 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 ( | ||
| "fmt" | ||
| "io" | ||
| "io/ioutil" | ||
| "os" | ||
|
|
||
| "github.com/google/go-containerregistry/pkg/name" | ||
| v1 "github.com/google/go-containerregistry/pkg/v1" | ||
| "github.com/google/go-containerregistry/pkg/v1/remote" | ||
| "github.com/google/go-containerregistry/pkg/v1/tarball" | ||
| ) | ||
|
|
||
| func ExampleWithProgress() { | ||
| /* calculations for this test: | ||
| The image we are using is docker.io/library/alpine:3.10 | ||
| its size on disk is 2800640 | ||
| The filesizes inside are: | ||
| -rw-r--r-- 0 0 0 1509 Jan 1 1970 sha256:be4e4bea2c2e15b403bb321562e78ea84b501fb41497472e91ecb41504e8a27c | ||
| -rw-r--r-- 0 0 0 2795580 Jan 1 1970 21c83c5242199776c232920ddb58cfa2a46b17e42ed831ca9001c8dbc532d22d.tar.gz | ||
| -rw-r--r-- 0 0 0 216 Jan 1 1970 manifest.json | ||
| when rounding each to a 512-byte block, plus the header, we get: | ||
| 1509 -> 1536 + 512 = 2048 | ||
| 2795580 -> 2796032 + 512 = 2796544 | ||
| 216 -> 512 + 512 = 1024 | ||
| add in 2 blocks of all 0x00 to indicate end of archive | ||
| = 1024 | ||
| ------- | ||
| Total: 2800640 | ||
| */ | ||
| // buffered channel to make the example test easier | ||
| c := make(chan v1.Update, 200) | ||
| // Make a tempfile for tarball writes. | ||
| fp, err := ioutil.TempFile("", "") | ||
| if err != nil { | ||
| fmt.Printf("error creating temp file: %v\n", err) | ||
| return | ||
| } | ||
| defer fp.Close() | ||
| defer os.Remove(fp.Name()) | ||
|
|
||
| tag, err := name.NewDigest("docker.io/library/alpine@sha256:f0e9534a598e501320957059cb2a23774b4d4072e37c7b2cf7e95b241f019e35", name.StrictValidation) | ||
| if err != nil { | ||
| fmt.Printf("error creating test tag: %v\n", err) | ||
| return | ||
| } | ||
| desc, err := remote.Get(tag) | ||
| if err != nil { | ||
| fmt.Printf("error getting manifest: %v", err) | ||
| return | ||
| } | ||
| img, err := desc.Image() | ||
| if err != nil { | ||
| fmt.Printf("error image: %v", err) | ||
| return | ||
| } | ||
| go func() { | ||
| _ = tarball.WriteToFile(fp.Name(), tag, img, tarball.WithProgress(c)) | ||
| }() | ||
| for update := range c { | ||
| switch { | ||
| case update.Error != nil && update.Error == io.EOF: | ||
| fmt.Fprintf(os.Stderr, "receive error message: %v\n", err) | ||
| fmt.Printf("%d/%d", update.Complete, update.Total) | ||
| // Output: 2800640/2800640 | ||
| 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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