/
tag_selected.go
64 lines (49 loc) · 1.6 KB
/
tag_selected.go
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// Copyright 2020 VMware, Inc.
// SPDX-License-Identifier: Apache-2.0
package image
import (
"fmt"
regname "github.com/google/go-containerregistry/pkg/name"
ctlreg "github.com/k14s/kbld/pkg/kbld/registry"
"github.com/vmware-tanzu/carvel-vendir/pkg/vendir/versions"
)
// TagSelectedImage respresents an image that will be resolved into url+digest
type TagSelectedImage struct {
url string
selection *versions.VersionSelection
registry ctlreg.Registry
}
func NewTagSelectedImage(url string, selection *versions.VersionSelection,
registry ctlreg.Registry) TagSelectedImage {
return TagSelectedImage{url, selection, registry}
}
func (i TagSelectedImage) URL() (string, []ImageMeta, error) {
repo, err := regname.NewRepository(i.url, regname.WeakValidation)
if err != nil {
return "", nil, err
}
var tag string
switch {
case i.selection.Semver != nil:
tags, err := i.registry.ListTags(repo)
if err != nil {
return "", nil, err
}
matchedVers := versions.NewSemvers(tags).FilterPrereleases(i.selection.Semver.Prereleases)
if len(i.selection.Semver.Constraints) > 0 {
matchedVers, err = matchedVers.FilterConstraints(i.selection.Semver.Constraints)
if err != nil {
return "", nil, fmt.Errorf("Selecting versions: %s", err)
}
}
highestVersion, found := matchedVers.Highest()
if !found {
return "", nil, fmt.Errorf("Expected to find at least one version, but did not")
}
tag = highestVersion
default:
return "", nil, fmt.Errorf("Unknown tag selection strategy")
}
// tag value is included by ResolvedImage
return NewResolvedImage(i.url+":"+tag, i.registry).URL()
}