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Vendor in c/image with sigstore support

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Signed-off-by: Miloslav Trmač <mitr@redhat.com>
This commit is contained in:
Miloslav Trmač
2022-07-06 07:15:31 +02:00
parent b95e081162
commit 06be7a1559
424 changed files with 35364 additions and 4746 deletions
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Apache License
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http://www.apache.org/licenses/
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# `name`
[![GoDoc](https://godoc.org/github.com/google/go-containerregistry/pkg/name?status.svg)](https://godoc.org/github.com/google/go-containerregistry/pkg/name)

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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 name
import (
"strings"
"unicode/utf8"
)
// stripRunesFn returns a function which returns -1 (i.e. a value which
// signals deletion in strings.Map) for runes in 'runes', and the rune otherwise.
func stripRunesFn(runes string) func(rune) rune {
return func(r rune) rune {
if strings.ContainsRune(runes, r) {
return -1
}
return r
}
}
// checkElement checks a given named element matches character and length restrictions.
// Returns true if the given element adheres to the given restrictions, false otherwise.
func checkElement(name, element, allowedRunes string, minRunes, maxRunes int) error {
numRunes := utf8.RuneCountInString(element)
if (numRunes < minRunes) || (maxRunes < numRunes) {
return newErrBadName("%s must be between %d and %d characters in length: %s", name, minRunes, maxRunes, element)
} else if len(strings.Map(stripRunesFn(allowedRunes), element)) != 0 {
return newErrBadName("%s can only contain the characters `%s`: %s", name, allowedRunes, element)
}
return nil
}

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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 name
import (
"strings"
)
const (
// These have the form: sha256:<hex string>
// TODO(dekkagaijin): replace with opencontainers/go-digest or docker/distribution's validation.
digestChars = "sh:0123456789abcdef"
digestDelim = "@"
)
// Digest stores a digest name in a structured form.
type Digest struct {
Repository
digest string
original string
}
// Ensure Digest implements Reference
var _ Reference = (*Digest)(nil)
// Context implements Reference.
func (d Digest) Context() Repository {
return d.Repository
}
// Identifier implements Reference.
func (d Digest) Identifier() string {
return d.DigestStr()
}
// DigestStr returns the digest component of the Digest.
func (d Digest) DigestStr() string {
return d.digest
}
// Name returns the name from which the Digest was derived.
func (d Digest) Name() string {
return d.Repository.Name() + digestDelim + d.DigestStr()
}
// String returns the original input string.
func (d Digest) String() string {
return d.original
}
func checkDigest(name string) error {
return checkElement("digest", name, digestChars, 7+64, 7+64)
}
// NewDigest returns a new Digest representing the given name.
func NewDigest(name string, opts ...Option) (Digest, error) {
// Split on "@"
parts := strings.Split(name, digestDelim)
if len(parts) != 2 {
return Digest{}, newErrBadName("a digest must contain exactly one '@' separator (e.g. registry/repository@digest) saw: %s", name)
}
base := parts[0]
digest := parts[1]
// Always check that the digest is valid.
if err := checkDigest(digest); err != nil {
return Digest{}, err
}
tag, err := NewTag(base, opts...)
if err == nil {
base = tag.Repository.Name()
}
repo, err := NewRepository(base, opts...)
if err != nil {
return Digest{}, err
}
return Digest{
Repository: repo,
digest: digest,
original: name,
}, nil
}

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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 name defines structured types for representing image references.
//
// What's in a name? For image references, not nearly enough!
//
// Image references look a lot like URLs, but they differ in that they don't
// contain the scheme (http or https), they can end with a :tag or a @digest
// (the latter being validated), and they perform defaulting for missing
// components.
//
// Since image references don't contain the scheme, we do our best to infer
// if we use http or https from the given hostname. We allow http fallback for
// any host that looks like localhost (localhost, 127.0.0.1, ::1), ends in
// ".local", or is in the "private" address space per RFC 1918. For everything
// else, we assume https only. To override this heuristic, use the Insecure
// option.
//
// Image references with a digest signal to us that we should verify the content
// of the image matches the digest. E.g. when pulling a Digest reference, we'll
// calculate the sha256 of the manifest returned by the registry and error out
// if it doesn't match what we asked for.
//
// For defaulting, we interpret "ubuntu" as
// "index.docker.io/library/ubuntu:latest" because we add the missing repo
// "library", the missing registry "index.docker.io", and the missing tag
// "latest". To disable this defaulting, use the StrictValidation option. This
// is useful e.g. to only allow image references that explicitly set a tag or
// digest, so that you don't accidentally pull "latest".
package name

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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 name
import (
"errors"
"fmt"
)
// ErrBadName is an error for when a bad docker name is supplied.
type ErrBadName struct {
info string
}
func (e *ErrBadName) Error() string {
return e.info
}
// newErrBadName returns a ErrBadName which returns the given formatted string from Error().
func newErrBadName(fmtStr string, args ...interface{}) *ErrBadName {
return &ErrBadName{fmt.Sprintf(fmtStr, args...)}
}
// IsErrBadName returns true if the given error is an ErrBadName.
//
// Deprecated: Use errors.Is.
func IsErrBadName(err error) bool {
var berr *ErrBadName
return errors.As(err, &berr)
}

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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 name
const (
// DefaultRegistry is the registry name that will be used if no registry
// provided and the default is not overridden.
DefaultRegistry = "index.docker.io"
defaultRegistryAlias = "docker.io"
// DefaultTag is the tag name that will be used if no tag provided and the
// default is not overridden.
DefaultTag = "latest"
)
type options struct {
strict bool // weak by default
insecure bool // secure by default
defaultRegistry string
defaultTag string
}
func makeOptions(opts ...Option) options {
opt := options{
defaultRegistry: DefaultRegistry,
defaultTag: DefaultTag,
}
for _, o := range opts {
o(&opt)
}
return opt
}
// Option is a functional option for name parsing.
type Option func(*options)
// StrictValidation is an Option that requires image references to be fully
// specified; i.e. no defaulting for registry (dockerhub), repo (library),
// or tag (latest).
func StrictValidation(opts *options) {
opts.strict = true
}
// WeakValidation is an Option that sets defaults when parsing names, see
// StrictValidation.
func WeakValidation(opts *options) {
opts.strict = false
}
// Insecure is an Option that allows image references to be fetched without TLS.
func Insecure(opts *options) {
opts.insecure = true
}
// OptionFn is a function that returns an option.
type OptionFn func() Option
// WithDefaultRegistry sets the default registry that will be used if one is not
// provided.
func WithDefaultRegistry(r string) Option {
return func(opts *options) {
opts.defaultRegistry = r
}
}
// WithDefaultTag sets the default tag that will be used if one is not provided.
func WithDefaultTag(t string) Option {
return func(opts *options) {
opts.defaultTag = t
}
}

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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 name
import (
"fmt"
)
// Reference defines the interface that consumers use when they can
// take either a tag or a digest.
type Reference interface {
fmt.Stringer
// Context accesses the Repository context of the reference.
Context() Repository
// Identifier accesses the type-specific portion of the reference.
Identifier() string
// Name is the fully-qualified reference name.
Name() string
// Scope is the scope needed to access this reference.
Scope(string) string
}
// ParseReference parses the string as a reference, either by tag or digest.
func ParseReference(s string, opts ...Option) (Reference, error) {
if t, err := NewTag(s, opts...); err == nil {
return t, nil
}
if d, err := NewDigest(s, opts...); err == nil {
return d, nil
}
return nil, newErrBadName("could not parse reference: " + s)
}
type stringConst string
// MustParseReference behaves like ParseReference, but panics instead of
// returning an error. It's intended for use in tests, or when a value is
// expected to be valid at code authoring time.
//
// To discourage its use in scenarios where the value is not known at code
// authoring time, it must be passed a string constant:
//
// const str = "valid/string"
// MustParseReference(str)
// MustParseReference("another/valid/string")
// MustParseReference(str + "/and/more")
//
// These will not compile:
//
// var str = "valid/string"
// MustParseReference(str)
// MustParseReference(strings.Join([]string{"valid", "string"}, "/"))
func MustParseReference(s stringConst, opts ...Option) Reference {
ref, err := ParseReference(string(s), opts...)
if err != nil {
panic(err)
}
return ref
}

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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 name
import (
"net"
"net/url"
"regexp"
"strings"
)
// Detect more complex forms of local references.
var reLocal = regexp.MustCompile(`.*\.local(?:host)?(?::\d{1,5})?$`)
// Detect the loopback IP (127.0.0.1)
var reLoopback = regexp.MustCompile(regexp.QuoteMeta("127.0.0.1"))
// Detect the loopback IPV6 (::1)
var reipv6Loopback = regexp.MustCompile(regexp.QuoteMeta("::1"))
// Registry stores a docker registry name in a structured form.
type Registry struct {
insecure bool
registry string
}
// RegistryStr returns the registry component of the Registry.
func (r Registry) RegistryStr() string {
return r.registry
}
// Name returns the name from which the Registry was derived.
func (r Registry) Name() string {
return r.RegistryStr()
}
func (r Registry) String() string {
return r.Name()
}
// Scope returns the scope required to access the registry.
func (r Registry) Scope(string) string {
// The only resource under 'registry' is 'catalog'. http://goo.gl/N9cN9Z
return "registry:catalog:*"
}
func (r Registry) isRFC1918() bool {
ipStr := strings.Split(r.Name(), ":")[0]
ip := net.ParseIP(ipStr)
if ip == nil {
return false
}
for _, cidr := range []string{"10.0.0.0/8", "172.16.0.0/12", "192.168.0.0/16"} {
_, block, _ := net.ParseCIDR(cidr)
if block.Contains(ip) {
return true
}
}
return false
}
// Scheme returns https scheme for all the endpoints except localhost or when explicitly defined.
func (r Registry) Scheme() string {
if r.insecure {
return "http"
}
if r.isRFC1918() {
return "http"
}
if strings.HasPrefix(r.Name(), "localhost:") {
return "http"
}
if reLocal.MatchString(r.Name()) {
return "http"
}
if reLoopback.MatchString(r.Name()) {
return "http"
}
if reipv6Loopback.MatchString(r.Name()) {
return "http"
}
return "https"
}
func checkRegistry(name string) error {
// Per RFC 3986, registries (authorities) are required to be prefixed with "//"
// url.Host == hostname[:port] == authority
if url, err := url.Parse("//" + name); err != nil || url.Host != name {
return newErrBadName("registries must be valid RFC 3986 URI authorities: %s", name)
}
return nil
}
// NewRegistry returns a Registry based on the given name.
// Strict validation requires explicit, valid RFC 3986 URI authorities to be given.
func NewRegistry(name string, opts ...Option) (Registry, error) {
opt := makeOptions(opts...)
if opt.strict && len(name) == 0 {
return Registry{}, newErrBadName("strict validation requires the registry to be explicitly defined")
}
if err := checkRegistry(name); err != nil {
return Registry{}, err
}
if name == "" {
name = opt.defaultRegistry
}
// Rewrite "docker.io" to "index.docker.io".
// See: https://github.com/google/go-containerregistry/issues/68
if name == defaultRegistryAlias {
name = DefaultRegistry
}
return Registry{registry: name, insecure: opt.insecure}, nil
}
// NewInsecureRegistry returns an Insecure Registry based on the given name.
//
// Deprecated: Use the Insecure Option with NewRegistry instead.
func NewInsecureRegistry(name string, opts ...Option) (Registry, error) {
opts = append(opts, Insecure)
return NewRegistry(name, opts...)
}

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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 name
import (
"fmt"
"strings"
)
const (
defaultNamespace = "library"
repositoryChars = "abcdefghijklmnopqrstuvwxyz0123456789_-./"
regRepoDelimiter = "/"
)
// Repository stores a docker repository name in a structured form.
type Repository struct {
Registry
repository string
}
// See https://docs.docker.com/docker-hub/official_repos
func hasImplicitNamespace(repo string, reg Registry) bool {
return !strings.ContainsRune(repo, '/') && reg.RegistryStr() == DefaultRegistry
}
// RepositoryStr returns the repository component of the Repository.
func (r Repository) RepositoryStr() string {
if hasImplicitNamespace(r.repository, r.Registry) {
return fmt.Sprintf("%s/%s", defaultNamespace, r.repository)
}
return r.repository
}
// Name returns the name from which the Repository was derived.
func (r Repository) Name() string {
regName := r.Registry.Name()
if regName != "" {
return regName + regRepoDelimiter + r.RepositoryStr()
}
// TODO: As far as I can tell, this is unreachable.
return r.RepositoryStr()
}
func (r Repository) String() string {
return r.Name()
}
// Scope returns the scope required to perform the given action on the registry.
// TODO(jonjohnsonjr): consider moving scopes to a separate package.
func (r Repository) Scope(action string) string {
return fmt.Sprintf("repository:%s:%s", r.RepositoryStr(), action)
}
func checkRepository(repository string) error {
return checkElement("repository", repository, repositoryChars, 2, 255)
}
// NewRepository returns a new Repository representing the given name, according to the given strictness.
func NewRepository(name string, opts ...Option) (Repository, error) {
opt := makeOptions(opts...)
if len(name) == 0 {
return Repository{}, newErrBadName("a repository name must be specified")
}
var registry string
repo := name
parts := strings.SplitN(name, regRepoDelimiter, 2)
if len(parts) == 2 && (strings.ContainsRune(parts[0], '.') || strings.ContainsRune(parts[0], ':')) {
// The first part of the repository is treated as the registry domain
// iff it contains a '.' or ':' character, otherwise it is all repository
// and the domain defaults to Docker Hub.
registry = parts[0]
repo = parts[1]
}
if err := checkRepository(repo); err != nil {
return Repository{}, err
}
reg, err := NewRegistry(registry, opts...)
if err != nil {
return Repository{}, err
}
if hasImplicitNamespace(repo, reg) && opt.strict {
return Repository{}, newErrBadName("strict validation requires the full repository path (missing 'library')")
}
return Repository{reg, repo}, nil
}
// Tag returns a Tag in this Repository.
func (r Repository) Tag(identifier string) Tag {
t := Tag{
tag: identifier,
Repository: r,
}
t.original = t.Name()
return t
}
// Digest returns a Digest in this Repository.
func (r Repository) Digest(identifier string) Digest {
d := Digest{
digest: identifier,
Repository: r,
}
d.original = d.Name()
return d
}

108
vendor/github.com/google/go-containerregistry/pkg/name/tag.go generated vendored Normal file
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@@ -0,0 +1,108 @@
// 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 name
import (
"strings"
)
const (
// TODO(dekkagaijin): use the docker/distribution regexes for validation.
tagChars = "abcdefghijklmnopqrstuvwxyz0123456789_-.ABCDEFGHIJKLMNOPQRSTUVWXYZ"
tagDelim = ":"
)
// Tag stores a docker tag name in a structured form.
type Tag struct {
Repository
tag string
original string
}
// Ensure Tag implements Reference
var _ Reference = (*Tag)(nil)
// Context implements Reference.
func (t Tag) Context() Repository {
return t.Repository
}
// Identifier implements Reference.
func (t Tag) Identifier() string {
return t.TagStr()
}
// TagStr returns the tag component of the Tag.
func (t Tag) TagStr() string {
return t.tag
}
// Name returns the name from which the Tag was derived.
func (t Tag) Name() string {
return t.Repository.Name() + tagDelim + t.TagStr()
}
// String returns the original input string.
func (t Tag) String() string {
return t.original
}
// Scope returns the scope required to perform the given action on the tag.
func (t Tag) Scope(action string) string {
return t.Repository.Scope(action)
}
func checkTag(name string) error {
return checkElement("tag", name, tagChars, 1, 128)
}
// NewTag returns a new Tag representing the given name, according to the given strictness.
func NewTag(name string, opts ...Option) (Tag, error) {
opt := makeOptions(opts...)
base := name
tag := ""
// Split on ":"
parts := strings.Split(name, tagDelim)
// Verify that we aren't confusing a tag for a hostname w/ port for the purposes of weak validation.
if len(parts) > 1 && !strings.Contains(parts[len(parts)-1], regRepoDelimiter) {
base = strings.Join(parts[:len(parts)-1], tagDelim)
tag = parts[len(parts)-1]
}
// We don't require a tag, but if we get one check it's valid,
// even when not being strict.
// If we are being strict, we want to validate the tag regardless in case
// it's empty.
if tag != "" || opt.strict {
if err := checkTag(tag); err != nil {
return Tag{}, err
}
}
if tag == "" {
tag = opt.defaultTag
}
repo, err := NewRepository(base, opts...)
if err != nil {
return Tag{}, err
}
return Tag{
Repository: repo,
tag: tag,
original: name,
}, nil
}