diff --git a/glide.lock b/glide.lock index 374fbd095..3aaac9dcc 100644 --- a/glide.lock +++ b/glide.lock @@ -1,8 +1,10 @@ -hash: 61c12670baff1b8a58d601c5afeae07ac831ef85cb67de3d4823ccdbb0085f56 -updated: 2016-09-21T13:59:32.039338003-07:00 +hash: 731b4c55f527573960d8a2e09881f77a431ecf2cb434192768a9e5be84ff1800 +updated: 2017-01-11T12:19:22.946780728-08:00 imports: +- name: github.com/opencontainers/go-digest + version: 21dfd564fd89c944783d00d069f33e3e7123c448 - name: github.com/pkg/errors - version: 17b591df37844cde689f4d5813e5cea0927d8dd2 + version: 645ef00459ed84a119197bfb8d8205042c6df63d - name: github.com/russross/blackfriday version: 0b647d0506a698cca42caca173e55559b12a69f2 - name: github.com/shurcooL/sanitized_anchor_name @@ -14,7 +16,7 @@ imports: - name: github.com/xeipuuv/gojsonschema version: d5336c75940ef31c9ceeb0ae64cf92944bccb4ee - name: go4.org - version: 27882e489dcd7ade28c033b82c6d498661c4dc42 + version: 3b6fde061c9c94928618caa51aff24646db549df subpackages: - errorutil testImports: [] diff --git a/glide.yaml b/glide.yaml index 34b4ac2bc..5f7f99785 100644 --- a/glide.yaml +++ b/glide.yaml @@ -1,10 +1,11 @@ package: github.com/opencontainers/image-spec import: - package: github.com/pkg/errors - version: ">=0.7.0" + version: '>=0.7.0' - package: github.com/xeipuuv/gojsonschema version: d5336c75940ef31c9ceeb0ae64cf92944bccb4ee - package: github.com/russross/blackfriday version: ~v1.4 - package: github.com/shurcooL/sanitized_anchor_name version: 10ef21a441db47d8b13ebcc5fd2310f636973c77 +- package: github.com/opencontainers/go-digest diff --git a/identity/chainid.go b/identity/chainid.go new file mode 100644 index 000000000..0bb285357 --- /dev/null +++ b/identity/chainid.go @@ -0,0 +1,67 @@ +// Copyright 2016 The Linux Foundation +// +// 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 identity provides implementations of subtle calculations pertaining +// to image and layer identity. The primary item present here is the ChainID +// calculation used in identifying the result of subsequent layer applications. +// +// Helpers are also provided here to ease transition to the +// github.com/opencontainers/go-digest package, but that package may be used +// directly. +package identity + +import "github.com/opencontainers/go-digest" + +// ChainID takes a slice of digests and returns the ChainID corresponding to +// the last entry. Typically, these are a list of layer DiffIDs, with the +// result providing the ChainID identifying the result of sequential +// application of the preceding layers. +func ChainID(dgsts []digest.Digest) digest.Digest { + chainIDs := make([]digest.Digest, len(dgsts)) + copy(chainIDs, dgsts) + ChainIDs(chainIDs) + + if len(chainIDs) == 0 { + return "" + } + return chainIDs[len(chainIDs)-1] +} + +// ChainIDs calculates the recursively applied chain id for each identifier in +// the slice. The result is written direcly back into the slice such that the +// ChainID for each item will be in the respective position. +// +// By definition of ChainID, the zeroth element will always be the same before +// and after the call. +// +// As an example, given the chain of ids `[A, B, C]`, the result `[A, +// ChainID(A|B), ChainID(A|B|C)]` will be written back to the slice. +// +// The input is provided as a return value for convenience. +// +// Typically, these are a list of layer DiffIDs, with the +// result providing the ChainID for each the result of each layer application +// sequentially. +func ChainIDs(dgsts []digest.Digest) []digest.Digest { + if len(dgsts) < 2 { + return dgsts + } + + parent := digest.FromBytes([]byte(dgsts[0] + " " + dgsts[1])) + next := dgsts[1:] + next[0] = parent + ChainIDs(next) + + return dgsts +} diff --git a/identity/chainid_test.go b/identity/chainid_test.go new file mode 100644 index 000000000..241dd9113 --- /dev/null +++ b/identity/chainid_test.go @@ -0,0 +1,95 @@ +// Copyright 2016 The Linux Foundation +// +// 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 identity + +import ( + _ "crypto/sha256" // required to install sha256 digest support + "reflect" + "testing" + + "github.com/opencontainers/go-digest" +) + +func TestChainID(t *testing.T) { + // To provide a good testing base, we define the individual links in a + // chain recursively, illustrating the calculations for each chain. + // + // Note that we use invalid digests for the unmodified identifiers here to + // make the computation more readable. + chainDigestAB := digest.FromString("sha256:a" + " " + "sha256:b") // chain for A|B + chainDigestABC := digest.FromString(chainDigestAB.String() + " " + "sha256:c") // chain for A|B|C + + for _, testcase := range []struct { + Name string + Digests []digest.Digest + Expected []digest.Digest + }{ + { + Name: "nil", + }, + { + Name: "empty", + Digests: []digest.Digest{}, + Expected: []digest.Digest{}, + }, + { + Name: "identity", + Digests: []digest.Digest{"sha256:a"}, + Expected: []digest.Digest{"sha256:a"}, + }, + { + Name: "two", + Digests: []digest.Digest{"sha256:a", "sha256:b"}, + Expected: []digest.Digest{"sha256:a", chainDigestAB}, + }, + { + Name: "three", + Digests: []digest.Digest{"sha256:a", "sha256:b", "sha256:c"}, + Expected: []digest.Digest{"sha256:a", chainDigestAB, chainDigestABC}, + }, + } { + t.Run(testcase.Name, func(t *testing.T) { + t.Log("before", testcase.Digests) + + var ids []digest.Digest + + if testcase.Digests != nil { + ids = make([]digest.Digest, len(testcase.Digests)) + copy(ids, testcase.Digests) + } + + ids = ChainIDs(ids) + t.Log("after", ids) + if !reflect.DeepEqual(ids, testcase.Expected) { + t.Errorf("unexpected chain: %v != %v", ids, testcase.Expected) + } + + if len(testcase.Digests) == 0 { + return + } + + // Make sure parent stays stable + if ids[0] != testcase.Digests[0] { + t.Errorf("parent changed: %v != %v", ids[0], testcase.Digests[0]) + } + + // make sure that the ChainID function takes the last element + id := ChainID(testcase.Digests) + if id != ids[len(ids)-1] { + t.Errorf("incorrect chain id returned from ChainID: %v != %v", id, ids[len(ids)-1]) + } + }) + } +} diff --git a/identity/helpers.go b/identity/helpers.go new file mode 100644 index 000000000..9d96eaa98 --- /dev/null +++ b/identity/helpers.go @@ -0,0 +1,40 @@ +// Copyright 2016 The Linux Foundation +// +// 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 identity + +import ( + _ "crypto/sha256" // side-effect to install impls, sha256 + _ "crypto/sha512" // side-effect to install impls, sha384/sh512 + + "io" + + digest "github.com/opencontainers/go-digest" +) + +// FromReader consumes the content of rd until io.EOF, returning canonical +// digest. +func FromReader(rd io.Reader) (digest.Digest, error) { + return digest.Canonical.FromReader(rd) +} + +// FromBytes digests the input and returns a Digest. +func FromBytes(p []byte) digest.Digest { + return digest.Canonical.FromBytes(p) +} + +// FromString digests the input and returns a Digest. +func FromString(s string) digest.Digest { + return digest.Canonical.FromString(s) +} diff --git a/vendor/github.com/opencontainers/go-digest/LICENSE.code b/vendor/github.com/opencontainers/go-digest/LICENSE.code new file mode 100644 index 000000000..0ea3ff81e --- /dev/null +++ b/vendor/github.com/opencontainers/go-digest/LICENSE.code @@ -0,0 +1,191 @@ + + Apache License + Version 2.0, January 2004 + https://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. 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For +the avoidance of doubt, this paragraph does not form part of the public +licenses. + +Creative Commons may be contacted at creativecommons.org. diff --git a/vendor/github.com/opencontainers/go-digest/algorithm.go b/vendor/github.com/opencontainers/go-digest/algorithm.go new file mode 100644 index 000000000..a3c44801d --- /dev/null +++ b/vendor/github.com/opencontainers/go-digest/algorithm.go @@ -0,0 +1,144 @@ +package digest + +import ( + "crypto" + "fmt" + "hash" + "io" +) + +// Algorithm identifies and implementation of a digester by an identifier. +// Note the that this defines both the hash algorithm used and the string +// encoding. +type Algorithm string + +// supported digest types +const ( + SHA256 Algorithm = "sha256" // sha256 with hex encoding + SHA384 Algorithm = "sha384" // sha384 with hex encoding + SHA512 Algorithm = "sha512" // sha512 with hex encoding + + // Canonical is the primary digest algorithm used with the distribution + // project. Other digests may be used but this one is the primary storage + // digest. + Canonical = SHA256 +) + +var ( + // TODO(stevvooe): Follow the pattern of the standard crypto package for + // registration of digests. Effectively, we are a registerable set and + // common symbol access. + + // algorithms maps values to hash.Hash implementations. Other algorithms + // may be available but they cannot be calculated by the digest package. + algorithms = map[Algorithm]crypto.Hash{ + SHA256: crypto.SHA256, + SHA384: crypto.SHA384, + SHA512: crypto.SHA512, + } +) + +// Available returns true if the digest type is available for use. If this +// returns false, Digester and Hash will return nil. +func (a Algorithm) Available() bool { + h, ok := algorithms[a] + if !ok { + return false + } + + // check availability of the hash, as well + return h.Available() +} + +func (a Algorithm) String() string { + return string(a) +} + +// Size returns number of bytes returned by the hash. +func (a Algorithm) Size() int { + h, ok := algorithms[a] + if !ok { + return 0 + } + return h.Size() +} + +// Set implemented to allow use of Algorithm as a command line flag. +func (a *Algorithm) Set(value string) error { + if value == "" { + *a = Canonical + } else { + // just do a type conversion, support is queried with Available. + *a = Algorithm(value) + } + + if !a.Available() { + return ErrDigestUnsupported + } + + return nil +} + +// Digester returns a new digester for the specified algorithm. If the algorithm +// does not have a digester implementation, nil will be returned. This can be +// checked by calling Available before calling Digester. +func (a Algorithm) Digester() Digester { + return &digester{ + alg: a, + hash: a.Hash(), + } +} + +// Hash returns a new hash as used by the algorithm. If not available, the +// method will panic. Check Algorithm.Available() before calling. +func (a Algorithm) Hash() hash.Hash { + if !a.Available() { + // Empty algorithm string is invalid + if a == "" { + panic(fmt.Sprintf("empty digest algorithm, validate before calling Algorithm.Hash()")) + } + + // NOTE(stevvooe): A missing hash is usually a programming error that + // must be resolved at compile time. We don't import in the digest + // package to allow users to choose their hash implementation (such as + // when using stevvooe/resumable or a hardware accelerated package). + // + // Applications that may want to resolve the hash at runtime should + // call Algorithm.Available before call Algorithm.Hash(). + panic(fmt.Sprintf("%v not available (make sure it is imported)", a)) + } + + return algorithms[a].New() +} + +// FromReader returns the digest of the reader using the algorithm. +func (a Algorithm) FromReader(rd io.Reader) (Digest, error) { + digester := a.Digester() + + if _, err := io.Copy(digester.Hash(), rd); err != nil { + return "", err + } + + return digester.Digest(), nil +} + +// FromBytes digests the input and returns a Digest. +func (a Algorithm) FromBytes(p []byte) Digest { + digester := a.Digester() + + if _, err := digester.Hash().Write(p); err != nil { + // Writes to a Hash should never fail. None of the existing + // hash implementations in the stdlib or hashes vendored + // here can return errors from Write. Having a panic in this + // condition instead of having FromBytes return an error value + // avoids unnecessary error handling paths in all callers. + panic("write to hash function returned error: " + err.Error()) + } + + return digester.Digest() +} + +// FromString digests the string input and returns a Digest. +func (a Algorithm) FromString(s string) Digest { + return a.FromBytes([]byte(s)) +} diff --git a/vendor/github.com/opencontainers/go-digest/digest.go b/vendor/github.com/opencontainers/go-digest/digest.go new file mode 100644 index 000000000..7c66c30c0 --- /dev/null +++ b/vendor/github.com/opencontainers/go-digest/digest.go @@ -0,0 +1,140 @@ +package digest + +import ( + "fmt" + "hash" + "io" + "regexp" + "strings" +) + +// Digest allows simple protection of hex formatted digest strings, prefixed +// by their algorithm. Strings of type Digest have some guarantee of being in +// the correct format and it provides quick access to the components of a +// digest string. +// +// The following is an example of the contents of Digest types: +// +// sha256:7173b809ca12ec5dee4506cd86be934c4596dd234ee82c0662eac04a8c2c71dc +// +// This allows to abstract the digest behind this type and work only in those +// terms. +type Digest string + +// NewDigest returns a Digest from alg and a hash.Hash object. +func NewDigest(alg Algorithm, h hash.Hash) Digest { + return NewDigestFromBytes(alg, h.Sum(nil)) +} + +// NewDigestFromBytes returns a new digest from the byte contents of p. +// Typically, this can come from hash.Hash.Sum(...) or xxx.SumXXX(...) +// functions. This is also useful for rebuilding digests from binary +// serializations. +func NewDigestFromBytes(alg Algorithm, p []byte) Digest { + return Digest(fmt.Sprintf("%s:%x", alg, p)) +} + +// NewDigestFromHex returns a Digest from alg and a the hex encoded digest. +func NewDigestFromHex(alg, hex string) Digest { + return Digest(fmt.Sprintf("%s:%s", alg, hex)) +} + +// DigestRegexp matches valid digest types. +var DigestRegexp = regexp.MustCompile(`[a-zA-Z0-9-_+.]+:[a-fA-F0-9]+`) + +// DigestRegexpAnchored matches valid digest types, anchored to the start and end of the match. +var DigestRegexpAnchored = regexp.MustCompile(`^` + DigestRegexp.String() + `$`) + +var ( + // ErrDigestInvalidFormat returned when digest format invalid. + ErrDigestInvalidFormat = fmt.Errorf("invalid checksum digest format") + + // ErrDigestInvalidLength returned when digest has invalid length. + ErrDigestInvalidLength = fmt.Errorf("invalid checksum digest length") + + // ErrDigestUnsupported returned when the digest algorithm is unsupported. + ErrDigestUnsupported = fmt.Errorf("unsupported digest algorithm") +) + +// Parse parses s and returns the validated digest object. An error will +// be returned if the format is invalid. +func Parse(s string) (Digest, error) { + d := Digest(s) + return d, d.Validate() +} + +// FromReader consumes the content of rd until io.EOF, returning canonical digest. +func FromReader(rd io.Reader) (Digest, error) { + return Canonical.FromReader(rd) +} + +// FromBytes digests the input and returns a Digest. +func FromBytes(p []byte) Digest { + return Canonical.FromBytes(p) +} + +// FromString digests the input and returns a Digest. +func FromString(s string) Digest { + return Canonical.FromString(s) +} + +// Validate checks that the contents of d is a valid digest, returning an +// error if not. +func (d Digest) Validate() error { + s := string(d) + + i := strings.Index(s, ":") + + // validate i then run through regexp + if i < 0 || i+1 == len(s) || !DigestRegexpAnchored.MatchString(s) { + return ErrDigestInvalidFormat + } + + algorithm := Algorithm(s[:i]) + if !algorithm.Available() { + return ErrDigestUnsupported + } + + // Digests much always be hex-encoded, ensuring that their hex portion will + // always be size*2 + if algorithm.Size()*2 != len(s[i+1:]) { + return ErrDigestInvalidLength + } + + return nil +} + +// Algorithm returns the algorithm portion of the digest. This will panic if +// the underlying digest is not in a valid format. +func (d Digest) Algorithm() Algorithm { + return Algorithm(d[:d.sepIndex()]) +} + +// Verifier returns a writer object that can be used to verify a stream of +// content against the digest. If the digest is invalid, the method will panic. +func (d Digest) Verifier() Verifier { + return hashVerifier{ + hash: d.Algorithm().Hash(), + digest: d, + } +} + +// Hex returns the hex digest portion of the digest. This will panic if the +// underlying digest is not in a valid format. +func (d Digest) Hex() string { + return string(d[d.sepIndex()+1:]) +} + +func (d Digest) String() string { + return string(d) +} + +func (d Digest) sepIndex() int { + i := strings.Index(string(d), ":") + + if i < 0 { + panic(fmt.Sprintf("no ':' separator in digest %q", d)) + } + + return i +} diff --git a/vendor/github.com/opencontainers/go-digest/digester.go b/vendor/github.com/opencontainers/go-digest/digester.go new file mode 100644 index 000000000..918a3f919 --- /dev/null +++ b/vendor/github.com/opencontainers/go-digest/digester.go @@ -0,0 +1,25 @@ +package digest + +import "hash" + +// Digester calculates the digest of written data. Writes should go directly +// to the return value of Hash, while calling Digest will return the current +// value of the digest. +type Digester interface { + Hash() hash.Hash // provides direct access to underlying hash instance. + Digest() Digest +} + +// digester provides a simple digester definition that embeds a hasher. +type digester struct { + alg Algorithm + hash hash.Hash +} + +func (d *digester) Hash() hash.Hash { + return d.hash +} + +func (d *digester) Digest() Digest { + return NewDigest(d.alg, d.hash) +} diff --git a/vendor/github.com/opencontainers/go-digest/doc.go b/vendor/github.com/opencontainers/go-digest/doc.go new file mode 100644 index 000000000..f64b0db32 --- /dev/null +++ b/vendor/github.com/opencontainers/go-digest/doc.go @@ -0,0 +1,42 @@ +// Package digest provides a generalized type to opaquely represent message +// digests and their operations within the registry. The Digest type is +// designed to serve as a flexible identifier in a content-addressable system. +// More importantly, it provides tools and wrappers to work with +// hash.Hash-based digests with little effort. +// +// Basics +// +// The format of a digest is simply a string with two parts, dubbed the +// "algorithm" and the "digest", separated by a colon: +// +// : +// +// An example of a sha256 digest representation follows: +// +// sha256:7173b809ca12ec5dee4506cd86be934c4596dd234ee82c0662eac04a8c2c71dc +// +// In this case, the string "sha256" is the algorithm and the hex bytes are +// the "digest". +// +// Because the Digest type is simply a string, once a valid Digest is +// obtained, comparisons are cheap, quick and simple to express with the +// standard equality operator. +// +// Verification +// +// The main benefit of using the Digest type is simple verification against a +// given digest. The Verifier interface, modeled after the stdlib hash.Hash +// interface, provides a common write sink for digest verification. After +// writing is complete, calling the Verifier.Verified method will indicate +// whether or not the stream of bytes matches the target digest. +// +// Missing Features +// +// In addition to the above, we intend to add the following features to this +// package: +// +// 1. A Digester type that supports write sink digest calculation. +// +// 2. Suspend and resume of ongoing digest calculations to support efficient digest verification in the registry. +// +package digest diff --git a/vendor/github.com/opencontainers/go-digest/verifiers.go b/vendor/github.com/opencontainers/go-digest/verifiers.go new file mode 100644 index 000000000..f1db6cda8 --- /dev/null +++ b/vendor/github.com/opencontainers/go-digest/verifiers.go @@ -0,0 +1,31 @@ +package digest + +import ( + "hash" + "io" +) + +// Verifier presents a general verification interface to be used with message +// digests and other byte stream verifications. Users instantiate a Verifier +// from one of the various methods, write the data under test to it then check +// the result with the Verified method. +type Verifier interface { + io.Writer + + // Verified will return true if the content written to Verifier matches + // the digest. + Verified() bool +} + +type hashVerifier struct { + digest Digest + hash hash.Hash +} + +func (hv hashVerifier) Write(p []byte) (n int, err error) { + return hv.hash.Write(p) +} + +func (hv hashVerifier) Verified() bool { + return hv.digest == NewDigest(hv.digest.Algorithm(), hv.hash) +} diff --git a/vendor/github.com/pkg/errors/errors.go b/vendor/github.com/pkg/errors/errors.go index 1c9731ac6..842ee8045 100644 --- a/vendor/github.com/pkg/errors/errors.go +++ b/vendor/github.com/pkg/errors/errors.go @@ -14,13 +14,18 @@ // Adding context to an error // // The errors.Wrap function returns a new error that adds context to the -// original error. For example +// original error by recording a stack trace at the point Wrap is called, +// and the supplied message. For example // // _, err := ioutil.ReadAll(r) // if err != nil { // return errors.Wrap(err, "read failed") // } // +// If additional control is required the errors.WithStack and errors.WithMessage +// functions destructure errors.Wrap into its component operations of annotating +// an error with a stack trace and an a message, respectively. +// // Retrieving the cause of an error // // Using errors.Wrap constructs a stack of errors, adding context to the @@ -134,6 +139,18 @@ func (f *fundamental) Format(s fmt.State, verb rune) { } } +// WithStack annotates err with a stack trace at the point WithStack was called. +// If err is nil, WithStack returns nil. +func WithStack(err error) error { + if err == nil { + return nil + } + return &withStack{ + err, + callers(), + } +} + type withStack struct { error *stack @@ -157,7 +174,8 @@ func (w *withStack) Format(s fmt.State, verb rune) { } } -// Wrap returns an error annotating err with message. +// Wrap returns an error annotating err with a stack trace +// at the point Wrap is called, and the supplied message. // If err is nil, Wrap returns nil. func Wrap(err error, message string) error { if err == nil { @@ -173,7 +191,8 @@ func Wrap(err error, message string) error { } } -// Wrapf returns an error annotating err with the format specifier. +// Wrapf returns an error annotating err with a stack trace +// at the point Wrapf is call, and the format specifier. // If err is nil, Wrapf returns nil. func Wrapf(err error, format string, args ...interface{}) error { if err == nil { @@ -189,6 +208,18 @@ func Wrapf(err error, format string, args ...interface{}) error { } } +// WithMessage annotates err with a new message. +// If err is nil, WithMessage returns nil. +func WithMessage(err error, message string) error { + if err == nil { + return nil + } + return &withMessage{ + cause: err, + msg: message, + } +} + type withMessage struct { cause error msg string