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3c6a907da9
* Create a MultiPublisher
MultiPublisher mimics io.MultiWriter in that it will publish an image to
multiple publish.Interface implementations.
* Add publish.{Tarball,Layout}Publisher
This adds support for publishing in the tarball format and to an OCI
image layout.
The tarball format isn't great, yet. It only supports writing once
instead of appending.
* Consolidate options
These were spread all over the place for no reasons. Now all the
publisher related options are grouped together.
* Add options for tarball/layout
Adds --oci-layout-path, --tarball, and --push flags.
--push=false will disable the default behavior of publishing to a
registry.
* go mod vendor
* Add Close method to publish.Interface
This allows us to defer writing to the tarball until we've collected all
the images that have been published.
* Fix tests
96 lines
2.6 KiB
Go
96 lines
2.6 KiB
Go
// Copyright 2020 Google LLC All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package publish
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import (
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"fmt"
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"log"
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"strings"
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"github.com/google/go-containerregistry/pkg/name"
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v1 "github.com/google/go-containerregistry/pkg/v1"
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"github.com/google/go-containerregistry/pkg/v1/tarball"
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)
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type TarballPublisher struct {
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file string
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base string
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namer Namer
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tags []string
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refs map[name.Reference]v1.Image
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}
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// NewTarball returns a new publish.Interface that saves images to a tarball.
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func NewTarball(file, base string, namer Namer, tags []string) *TarballPublisher {
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return &TarballPublisher{
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file: file,
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base: base,
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namer: namer,
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tags: tags,
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refs: make(map[name.Reference]v1.Image),
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}
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}
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// Publish implements publish.Interface.
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func (t *TarballPublisher) Publish(img v1.Image, s string) (name.Reference, error) {
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// https://github.com/google/go-containerregistry/issues/212
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s = strings.ToLower(s)
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for _, tagName := range t.tags {
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tag, err := name.ParseReference(fmt.Sprintf("%s/%s:%s", t.base, t.namer(s), tagName))
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if err != nil {
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return nil, err
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}
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t.refs[tag] = img
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}
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h, err := img.Digest()
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if err != nil {
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return nil, err
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}
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if len(t.tags) == 0 {
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ref, err := name.ParseReference(fmt.Sprintf("%s/%s@%s", t.base, t.namer(s), h))
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if err != nil {
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return nil, err
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}
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t.refs[ref] = img
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}
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ref := fmt.Sprintf("%s/%s@%s", t.base, t.namer(s), h)
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if len(t.tags) == 1 && t.tags[0] != defaultTags[0] {
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// If a single tag is explicitly set (not latest), then this
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// is probably a release, so include the tag in the reference.
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ref = fmt.Sprintf("%s/%s:%s@%s", t.base, t.namer(s), t.tags[0], h)
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}
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dig, err := name.NewDigest(ref)
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if err != nil {
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return nil, err
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}
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return &dig, nil
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}
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func (t *TarballPublisher) Close() error {
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log.Printf("Saving %v", t.file)
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if err := tarball.MultiRefWriteToFile(t.file, t.refs); err != nil {
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// Bad practice, but we log this here because right now we just defer the Close.
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log.Printf("failed to save %q: %v", t.file, err)
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return err
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}
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log.Printf("Saved %v", t.file)
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return nil
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}
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