Move docker reference functionality to reference package
Add normalization functions and Docker specific domain splitting to reference package. Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)
This commit is contained in:
Derek McGowan
parent
21db8e8597
commit
042fe9bf46
2 changed files with 547 additions and 2 deletions
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@ -1,9 +1,89 @@
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package reference
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import (
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"errors"
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"fmt"
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"strings"
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"github.com/docker/distribution/digest"
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)
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var (
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legacyDefaultDomain = "index.docker.io"
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defaultDomain = "docker.io"
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defaultRepoPrefix = "library/"
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defaultTag = "latest"
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)
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// NormalizedName parses a string into a named reference
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// transforming a familiar name from Docker UI to a fully
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// qualified reference. If the value may be an identifier
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// use ParseAnyReference.
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func NormalizedName(s string) (Named, error) {
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if ok := anchoredIdentifierRegexp.MatchString(s); ok {
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return nil, fmt.Errorf("invalid repository name (%s), cannot specify 64-byte hexadecimal strings", s)
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}
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domain, remainder := splitDockerDomain(s)
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var remoteName string
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if tagSep := strings.IndexRune(remainder, ':'); tagSep > -1 {
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remoteName = remainder[:tagSep]
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} else {
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remoteName = remainder
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}
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if strings.ToLower(remoteName) != remoteName {
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return nil, errors.New("invalid reference format: repository name must be lowercase")
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}
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return ParseNamed(domain + "/" + remainder)
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}
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// splitDockerDomain splits a repository name to domain and remotename string.
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// If no valid domain is found, the default domain is used. Repository name
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// needs to be already validated before.
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func splitDockerDomain(name string) (domain, remainder string) {
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i := strings.IndexRune(name, '/')
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if i == -1 || (!strings.ContainsAny(name[:i], ".:") && name[:i] != "localhost") {
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domain, remainder = defaultDomain, name
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} else {
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domain, remainder = name[:i], name[i+1:]
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}
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if domain == legacyDefaultDomain {
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domain = defaultDomain
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}
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if domain == defaultDomain && !strings.ContainsRune(remainder, '/') {
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remainder = defaultRepoPrefix + remainder
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}
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return
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}
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// FamiliarName returns a shortened version of the name familiar
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// to to the Docker UI. Familiar names have the default domain
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// "docker.io" and "library/" repository prefix removed.
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// For example, "docker.io/library/redis" will have the familiar
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// name "redis" and "docker.io/dmcgowan/myapp" will be "dmcgowan/myapp".
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func FamiliarName(named Named) Named {
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var repo repository
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repo.domain, repo.path = splitDomain(named.Name())
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if repo.domain == defaultDomain {
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repo.domain = ""
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repo.path = strings.TrimPrefix(repo.path, defaultRepoPrefix)
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}
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if digested, ok := named.(Digested); ok {
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return canonicalReference{
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repository: repo,
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digest: digested.Digest(),
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}
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}
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if tagged, ok := named.(Tagged); ok {
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return taggedReference{
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repository: repo,
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tag: tagged.Tag(),
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}
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}
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return repo
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}
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// EnsureTagged adds the default tag "latest" to a reference if it only has
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// a repo name.
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func EnsureTagged(ref Named) NamedTagged {
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@ -20,3 +100,33 @@ func EnsureTagged(ref Named) NamedTagged {
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}
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return namedTagged
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}
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// ParseAnyReference parses a reference string as a possible identifier,
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// full digest, or familiar name.
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func ParseAnyReference(ref string) (Reference, error) {
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if ok := anchoredIdentifierRegexp.MatchString(ref); ok {
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return digestReference("sha256:" + ref), nil
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}
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if dgst, err := digest.ParseDigest(ref); err == nil {
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return digestReference(dgst), nil
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}
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return NormalizedName(ref)
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}
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// ParseAnyReferenceWithSet parses a reference string as a possible short
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// identifier to be matched in a digest set, a full digest, or familiar name.
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func ParseAnyReferenceWithSet(ref string, ds *digest.Set) (Reference, error) {
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if ok := anchoredShortIdentifierRegexp.MatchString(ref); ok {
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dgst, err := ds.Lookup(ref)
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if err == nil {
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return digestReference(dgst), nil
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}
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} else {
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if dgst, err := digest.ParseDigest(ref); err == nil {
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return digestReference(dgst), nil
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}
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}
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return NormalizedName(ref)
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}
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435
reference/normalize_test.go
Normal file
435
reference/normalize_test.go
Normal file
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@ -0,0 +1,435 @@
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package reference
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import (
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"testing"
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"github.com/docker/distribution/digest"
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)
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func TestValidateReferenceName(t *testing.T) {
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validRepoNames := []string{
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"docker/docker",
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"library/debian",
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"debian",
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"docker.io/docker/docker",
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"docker.io/library/debian",
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"docker.io/debian",
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"index.docker.io/docker/docker",
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"index.docker.io/library/debian",
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"index.docker.io/debian",
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"127.0.0.1:5000/docker/docker",
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"127.0.0.1:5000/library/debian",
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"127.0.0.1:5000/debian",
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"thisisthesongthatneverendsitgoesonandonandonthisisthesongthatnev",
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// This test case was moved from invalid to valid since it is valid input
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// when specified with a hostname, it removes the ambiguity from about
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// whether the value is an identifier or repository name
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"docker.io/1a3f5e7d9c1b3a5f7e9d1c3b5a7f9e1d3c5b7a9f1e3d5d7c9b1a3f5e7d9c1b3a",
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}
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invalidRepoNames := []string{
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"https://github.com/docker/docker",
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"docker/Docker",
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"-docker",
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"-docker/docker",
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"-docker.io/docker/docker",
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"docker///docker",
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"docker.io/docker/Docker",
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"docker.io/docker///docker",
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"1a3f5e7d9c1b3a5f7e9d1c3b5a7f9e1d3c5b7a9f1e3d5d7c9b1a3f5e7d9c1b3a",
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}
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for _, name := range invalidRepoNames {
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_, err := NormalizedName(name)
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if err == nil {
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t.Fatalf("Expected invalid repo name for %q", name)
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}
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}
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for _, name := range validRepoNames {
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_, err := NormalizedName(name)
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if err != nil {
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t.Fatalf("Error parsing repo name %s, got: %q", name, err)
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}
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}
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}
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func TestValidateRemoteName(t *testing.T) {
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validRepositoryNames := []string{
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// Sanity check.
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"docker/docker",
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// Allow 64-character non-hexadecimal names (hexadecimal names are forbidden).
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"thisisthesongthatneverendsitgoesonandonandonthisisthesongthatnev",
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// Allow embedded hyphens.
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"docker-rules/docker",
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// Allow multiple hyphens as well.
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"docker---rules/docker",
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//Username doc and image name docker being tested.
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"doc/docker",
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// single character names are now allowed.
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"d/docker",
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"jess/t",
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// Consecutive underscores.
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"dock__er/docker",
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}
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for _, repositoryName := range validRepositoryNames {
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_, err := NormalizedName(repositoryName)
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if err != nil {
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t.Errorf("Repository name should be valid: %v. Error: %v", repositoryName, err)
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}
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}
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invalidRepositoryNames := []string{
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// Disallow capital letters.
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"docker/Docker",
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// Only allow one slash.
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"docker///docker",
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// Disallow 64-character hexadecimal.
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"1a3f5e7d9c1b3a5f7e9d1c3b5a7f9e1d3c5b7a9f1e3d5d7c9b1a3f5e7d9c1b3a",
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// Disallow leading and trailing hyphens in namespace.
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"-docker/docker",
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"docker-/docker",
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"-docker-/docker",
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// Don't allow underscores everywhere (as opposed to hyphens).
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"____/____",
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"_docker/_docker",
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// Disallow consecutive periods.
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"dock..er/docker",
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"dock_.er/docker",
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"dock-.er/docker",
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// No repository.
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"docker/",
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//namespace too long
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"this_is_not_a_valid_namespace_because_its_lenth_is_greater_than_255_this_is_not_a_valid_namespace_because_its_lenth_is_greater_than_255_this_is_not_a_valid_namespace_because_its_lenth_is_greater_than_255_this_is_not_a_valid_namespace_because_its_lenth_is_greater_than_255/docker",
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}
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for _, repositoryName := range invalidRepositoryNames {
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if _, err := NormalizedName(repositoryName); err == nil {
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t.Errorf("Repository name should be invalid: %v", repositoryName)
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}
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}
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}
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func TestParseRepositoryInfo(t *testing.T) {
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type tcase struct {
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RemoteName, FamiliarName, FullName, AmbiguousName, Domain string
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}
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tcases := []tcase{
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{
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RemoteName: "fooo/bar",
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FamiliarName: "fooo/bar",
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FullName: "docker.io/fooo/bar",
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AmbiguousName: "index.docker.io/fooo/bar",
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Domain: "docker.io",
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},
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{
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RemoteName: "library/ubuntu",
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FamiliarName: "ubuntu",
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FullName: "docker.io/library/ubuntu",
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AmbiguousName: "library/ubuntu",
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Domain: "docker.io",
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},
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{
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RemoteName: "nonlibrary/ubuntu",
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FamiliarName: "nonlibrary/ubuntu",
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FullName: "docker.io/nonlibrary/ubuntu",
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AmbiguousName: "",
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Domain: "docker.io",
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},
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{
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RemoteName: "other/library",
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FamiliarName: "other/library",
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FullName: "docker.io/other/library",
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AmbiguousName: "",
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Domain: "docker.io",
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},
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{
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RemoteName: "private/moonbase",
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FamiliarName: "127.0.0.1:8000/private/moonbase",
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FullName: "127.0.0.1:8000/private/moonbase",
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AmbiguousName: "",
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Domain: "127.0.0.1:8000",
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},
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{
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RemoteName: "privatebase",
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FamiliarName: "127.0.0.1:8000/privatebase",
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FullName: "127.0.0.1:8000/privatebase",
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AmbiguousName: "",
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Domain: "127.0.0.1:8000",
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},
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{
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RemoteName: "private/moonbase",
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FamiliarName: "example.com/private/moonbase",
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FullName: "example.com/private/moonbase",
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AmbiguousName: "",
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Domain: "example.com",
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},
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{
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RemoteName: "privatebase",
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FamiliarName: "example.com/privatebase",
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FullName: "example.com/privatebase",
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AmbiguousName: "",
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Domain: "example.com",
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},
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{
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RemoteName: "private/moonbase",
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FamiliarName: "example.com:8000/private/moonbase",
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FullName: "example.com:8000/private/moonbase",
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AmbiguousName: "",
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Domain: "example.com:8000",
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},
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{
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RemoteName: "privatebasee",
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FamiliarName: "example.com:8000/privatebasee",
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FullName: "example.com:8000/privatebasee",
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AmbiguousName: "",
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Domain: "example.com:8000",
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},
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{
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RemoteName: "library/ubuntu-12.04-base",
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FamiliarName: "ubuntu-12.04-base",
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FullName: "docker.io/library/ubuntu-12.04-base",
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AmbiguousName: "index.docker.io/library/ubuntu-12.04-base",
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Domain: "docker.io",
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},
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}
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for _, tcase := range tcases {
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refStrings := []string{tcase.FamiliarName, tcase.FullName}
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if tcase.AmbiguousName != "" {
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refStrings = append(refStrings, tcase.AmbiguousName)
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}
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var refs []Named
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for _, r := range refStrings {
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named, err := NormalizedName(r)
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if err != nil {
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t.Fatal(err)
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}
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refs = append(refs, named)
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}
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for _, r := range refs {
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if expected, actual := tcase.FamiliarName, FamiliarName(r).Name(); expected != actual {
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t.Fatalf("Invalid normalized reference for %q. Expected %q, got %q", r, expected, actual)
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}
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if expected, actual := tcase.FullName, r.String(); expected != actual {
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t.Fatalf("Invalid canonical reference for %q. Expected %q, got %q", r, expected, actual)
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}
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if expected, actual := tcase.Domain, Domain(r); expected != actual {
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t.Fatalf("Invalid domain for %q. Expected %q, got %q", r, expected, actual)
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}
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if expected, actual := tcase.RemoteName, Path(r); expected != actual {
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t.Fatalf("Invalid remoteName for %q. Expected %q, got %q", r, expected, actual)
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}
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}
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}
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}
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func TestParseReferenceWithTagAndDigest(t *testing.T) {
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ref, err := NormalizedName("busybox:latest@sha256:86e0e091d0da6bde2456dbb48306f3956bbeb2eae1b5b9a43045843f69fe4aaa")
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if err != nil {
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t.Fatal(err)
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}
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if expected, actual := "docker.io/library/busybox:latest@sha256:86e0e091d0da6bde2456dbb48306f3956bbeb2eae1b5b9a43045843f69fe4aaa", ref.String(); actual != expected {
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t.Fatalf("Invalid parsed reference for %q: expected %q, got %q", ref, expected, actual)
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}
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ref = FamiliarName(ref)
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if _, isTagged := ref.(NamedTagged); isTagged {
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t.Fatalf("Reference from %q should not support tag", ref)
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}
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if _, isCanonical := ref.(Canonical); !isCanonical {
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t.Fatalf("Reference from %q should not support digest", ref)
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}
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if expected, actual := "busybox@sha256:86e0e091d0da6bde2456dbb48306f3956bbeb2eae1b5b9a43045843f69fe4aaa", FamiliarName(ref).String(); actual != expected {
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t.Fatalf("Invalid parsed reference for %q: expected %q, got %q", ref, expected, actual)
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}
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}
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func TestInvalidReferenceComponents(t *testing.T) {
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if _, err := NormalizedName("-foo"); err == nil {
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t.Fatal("Expected WithName to detect invalid name")
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}
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ref, err := NormalizedName("busybox")
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if err != nil {
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t.Fatal(err)
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}
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if _, err := WithTag(ref, "-foo"); err == nil {
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t.Fatal("Expected WithName to detect invalid tag")
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}
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if _, err := WithDigest(ref, digest.Digest("foo")); err == nil {
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t.Fatal("Expected WithDigest to detect invalid digest")
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}
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}
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func equalReference(r1, r2 Reference) bool {
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switch v1 := r1.(type) {
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case digestReference:
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if v2, ok := r2.(digestReference); ok {
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return v1 == v2
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}
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case repository:
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if v2, ok := r2.(repository); ok {
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return v1 == v2
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}
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case taggedReference:
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if v2, ok := r2.(taggedReference); ok {
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return v1 == v2
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}
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case canonicalReference:
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if v2, ok := r2.(canonicalReference); ok {
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return v1 == v2
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}
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case reference:
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if v2, ok := r2.(reference); ok {
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return v1 == v2
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}
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}
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return false
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}
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func TestParseAnyReference(t *testing.T) {
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tcases := []struct {
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Reference string
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Equivalent string
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Expected Reference
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Digests []digest.Digest
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}{
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{
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Reference: "redis",
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Equivalent: "docker.io/library/redis",
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},
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{
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Reference: "redis:latest",
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Equivalent: "docker.io/library/redis:latest",
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},
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{
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Reference: "docker.io/library/redis:latest",
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Equivalent: "docker.io/library/redis:latest",
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},
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{
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Reference: "redis@sha256:dbcc1c35ac38df41fd2f5e4130b32ffdb93ebae8b3dbe638c23575912276fc9c",
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Equivalent: "docker.io/library/redis@sha256:dbcc1c35ac38df41fd2f5e4130b32ffdb93ebae8b3dbe638c23575912276fc9c",
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},
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{
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Reference: "docker.io/library/redis@sha256:dbcc1c35ac38df41fd2f5e4130b32ffdb93ebae8b3dbe638c23575912276fc9c",
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Equivalent: "docker.io/library/redis@sha256:dbcc1c35ac38df41fd2f5e4130b32ffdb93ebae8b3dbe638c23575912276fc9c",
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},
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{
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Reference: "dmcgowan/myapp",
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Equivalent: "docker.io/dmcgowan/myapp",
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||||
},
|
||||
{
|
||||
Reference: "dmcgowan/myapp:latest",
|
||||
Equivalent: "docker.io/dmcgowan/myapp:latest",
|
||||
},
|
||||
{
|
||||
Reference: "docker.io/mcgowan/myapp:latest",
|
||||
Equivalent: "docker.io/mcgowan/myapp:latest",
|
||||
},
|
||||
{
|
||||
Reference: "dmcgowan/myapp@sha256:dbcc1c35ac38df41fd2f5e4130b32ffdb93ebae8b3dbe638c23575912276fc9c",
|
||||
Equivalent: "docker.io/dmcgowan/myapp@sha256:dbcc1c35ac38df41fd2f5e4130b32ffdb93ebae8b3dbe638c23575912276fc9c",
|
||||
},
|
||||
{
|
||||
Reference: "docker.io/dmcgowan/myapp@sha256:dbcc1c35ac38df41fd2f5e4130b32ffdb93ebae8b3dbe638c23575912276fc9c",
|
||||
Equivalent: "docker.io/dmcgowan/myapp@sha256:dbcc1c35ac38df41fd2f5e4130b32ffdb93ebae8b3dbe638c23575912276fc9c",
|
||||
},
|
||||
{
|
||||
Reference: "dbcc1c35ac38df41fd2f5e4130b32ffdb93ebae8b3dbe638c23575912276fc9c",
|
||||
Expected: digestReference("sha256:dbcc1c35ac38df41fd2f5e4130b32ffdb93ebae8b3dbe638c23575912276fc9c"),
|
||||
},
|
||||
{
|
||||
Reference: "sha256:dbcc1c35ac38df41fd2f5e4130b32ffdb93ebae8b3dbe638c23575912276fc9c",
|
||||
Expected: digestReference("sha256:dbcc1c35ac38df41fd2f5e4130b32ffdb93ebae8b3dbe638c23575912276fc9c"),
|
||||
},
|
||||
{
|
||||
Reference: "dbcc1c35ac38df41fd2f5e4130b32ffdb93ebae8b3dbe638c23575912276fc9",
|
||||
Equivalent: "docker.io/library/dbcc1c35ac38df41fd2f5e4130b32ffdb93ebae8b3dbe638c23575912276fc9",
|
||||
},
|
||||
{
|
||||
Reference: "dbcc1c35ac38df41fd2f5e4130b32ffdb93ebae8b3dbe638c23575912276fc9",
|
||||
Expected: digestReference("sha256:dbcc1c35ac38df41fd2f5e4130b32ffdb93ebae8b3dbe638c23575912276fc9c"),
|
||||
Digests: []digest.Digest{
|
||||
digest.Digest("sha256:dbcc1c35ac38df41fd2f5e4130b32ffdb93ebae8b3dbe638c23575912276fc9c"),
|
||||
digest.Digest("sha256:abcc1c35ac38df41fd2f5e4130b32ffdb93ebae8b3dbe638c23575912276fc9c"),
|
||||
},
|
||||
},
|
||||
{
|
||||
Reference: "dbcc1c35ac38df41fd2f5e4130b32ffdb93ebae8b3dbe638c23575912276fc9",
|
||||
Equivalent: "docker.io/library/dbcc1c35ac38df41fd2f5e4130b32ffdb93ebae8b3dbe638c23575912276fc9",
|
||||
Digests: []digest.Digest{
|
||||
digest.Digest("sha256:abcc1c35ac38df41fd2f5e4130b32ffdb93ebae8b3dbe638c23575912276fc9c"),
|
||||
},
|
||||
},
|
||||
{
|
||||
Reference: "dbcc1c",
|
||||
Expected: digestReference("sha256:dbcc1c35ac38df41fd2f5e4130b32ffdb93ebae8b3dbe638c23575912276fc9c"),
|
||||
Digests: []digest.Digest{
|
||||
digest.Digest("sha256:dbcc1c35ac38df41fd2f5e4130b32ffdb93ebae8b3dbe638c23575912276fc9c"),
|
||||
digest.Digest("sha256:abcc1c35ac38df41fd2f5e4130b32ffdb93ebae8b3dbe638c23575912276fc9c"),
|
||||
},
|
||||
},
|
||||
{
|
||||
Reference: "dbcc1",
|
||||
Equivalent: "docker.io/library/dbcc1",
|
||||
Digests: []digest.Digest{
|
||||
digest.Digest("sha256:dbcc1c35ac38df41fd2f5e4130b32ffdb93ebae8b3dbe638c23575912276fc9c"),
|
||||
digest.Digest("sha256:abcc1c35ac38df41fd2f5e4130b32ffdb93ebae8b3dbe638c23575912276fc9c"),
|
||||
},
|
||||
},
|
||||
{
|
||||
Reference: "dbcc1c",
|
||||
Equivalent: "docker.io/library/dbcc1c",
|
||||
Digests: []digest.Digest{
|
||||
digest.Digest("sha256:abcc1c35ac38df41fd2f5e4130b32ffdb93ebae8b3dbe638c23575912276fc9c"),
|
||||
},
|
||||
},
|
||||
}
|
||||
|
||||
for _, tcase := range tcases {
|
||||
var ref Reference
|
||||
var err error
|
||||
if len(tcase.Digests) == 0 {
|
||||
ref, err = ParseAnyReference(tcase.Reference)
|
||||
} else {
|
||||
ds := digest.NewSet()
|
||||
for _, dgst := range tcase.Digests {
|
||||
if err := ds.Add(dgst); err != nil {
|
||||
t.Fatalf("Error adding digest %s: %v", dgst.String(), err)
|
||||
}
|
||||
}
|
||||
ref, err = ParseAnyReferenceWithSet(tcase.Reference, ds)
|
||||
}
|
||||
if err != nil {
|
||||
t.Fatalf("Error parsing reference %s: %v", tcase.Reference, err)
|
||||
}
|
||||
|
||||
expected := tcase.Expected
|
||||
if expected == nil {
|
||||
expected, err = Parse(tcase.Equivalent)
|
||||
if err != nil {
|
||||
t.Fatalf("Error parsing reference %s: %v", tcase.Equivalent, err)
|
||||
}
|
||||
}
|
||||
if !equalReference(ref, expected) {
|
||||
t.Errorf("Unexpected reference %#v, expected %#v", ref, expected)
|
||||
}
|
||||
}
|
||||
}
|
||||
Loading…
Reference in a new issue