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integration: add upstream validator to OCI roundtrip tests

Browse Source 
In order to make sure that we don't create invalid OCI images that are
consistently invalid, add additional checks to ensure that both of the
generated OCI images in the round-trip test are valid according to the
upstream validator.

This commit vendors the following packages (deep breath):
* oci/image-tools@7575a09363, which requires
* oci/image-spec@v1.0.0-rc4 [revendor, but is technically an update
  because I couldn't figure out what version was vendored last time]
* oci/runtime-spec@v1.0.0-rc4
* xeipuuv/gojsonschema@6b67b3fab7
* xeipuuv/gojsonreference@e02fc20de9
* xeipuuv/gojsonpointer@e0fe6f6830
* camlistore/go4@7ce08ca145

Signed-off-by: Aleksa Sarai <asarai@suse.de>
This commit is contained in:
Aleksa Sarai
2017-02-16 21:27:12 +11:00
parent 76f5c6d4c5
commit eea384cdf7
42 changed files with 7150 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

201
vendor/github.com/opencontainers/image-tools/LICENSE generated vendored Normal file
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vendor/github.com/opencontainers/image-tools/image/autodetect.go generated vendored Normal file
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// 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 image
import (
"encoding/json"
"io"
"io/ioutil"
"net/http"
"os"
"github.com/opencontainers/image-spec/schema"
"github.com/pkg/errors"
)
// supported autodetection types
const (
TypeImageLayout = "imageLayout"
TypeImage = "image"
TypeManifest = "manifest"
TypeManifestList = "manifestList"
TypeConfig = "config"
)
// Autodetect detects the validation type for the given path
// or an error if the validation type could not be resolved.
func Autodetect(path string) (string, error) {
fi, err := os.Stat(path)
if err != nil {
return "", errors.Wrapf(err, "unable to access path") // err from os.Stat includes path name
}
if fi.IsDir() {
return TypeImageLayout, nil
}
f, err := os.Open(path)
if err != nil {
return "", errors.Wrap(err, "unable to open file") // os.Open includes the filename
}
defer f.Close()
buf, err := ioutil.ReadAll(io.LimitReader(f, 512)) // read some initial bytes to detect content
if err != nil {
return "", errors.Wrap(err, "unable to read")
}
mimeType := http.DetectContentType(buf)
switch mimeType {
case "application/x-gzip", "application/octet-stream":
return TypeImage, nil
case "text/plain; charset=utf-8":
// might be a JSON file, will be handled below
default:
return "", errors.New("unknown file type")
}
if _, err := f.Seek(0, os.SEEK_SET); err != nil {
return "", errors.Wrap(err, "unable to seek")
}
header := struct {
SchemaVersion int `json:"schemaVersion"`
MediaType string `json:"mediaType"`
Config interface{} `json:"config"`
}{}
if err := json.NewDecoder(f).Decode(&header); err != nil {
if _, errSeek := f.Seek(0, os.SEEK_SET); errSeek != nil {
return "", errors.Wrap(err, "unable to seek")
}
e := errors.Wrap(
schema.WrapSyntaxError(f, err),
"unable to parse JSON",
)
return "", e
}
switch {
case header.MediaType == string(schema.MediaTypeManifest):
return TypeManifest, nil
case header.MediaType == string(schema.MediaTypeManifestList):
return TypeManifestList, nil
case header.MediaType == "" && header.SchemaVersion == 0 && header.Config != nil:
// config files don't have mediaType/schemaVersion header
return TypeConfig, nil
}
return "", errors.New("unknown media type")
}

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vendor/github.com/opencontainers/image-tools/image/config.go generated vendored Normal file
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// 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 image
import (
"bytes"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
"strconv"
"strings"
"github.com/opencontainers/image-spec/schema"
"github.com/opencontainers/image-spec/specs-go/v1"
"github.com/opencontainers/runtime-spec/specs-go"
"github.com/pkg/errors"
)
type config v1.Image
func findConfig(w walker, d *descriptor) (*config, error) {
var c config
cpath := filepath.Join("blobs", d.algo(), d.hash())
switch err := w.walk(func(path string, info os.FileInfo, r io.Reader) error {
if info.IsDir() || filepath.Clean(path) != cpath {
return nil
}
buf, err := ioutil.ReadAll(r)
if err != nil {
return errors.Wrapf(err, "%s: error reading config", path)
}
if err := schema.MediaTypeImageConfig.Validate(bytes.NewReader(buf)); err != nil {
return errors.Wrapf(err, "%s: config validation failed", path)
}
if err := json.Unmarshal(buf, &c); err != nil {
return err
}
return errEOW
}); err {
case nil:
return nil, fmt.Errorf("%s: config not found", cpath)
case errEOW:
return &c, nil
default:
return nil, err
}
}
func (c *config) runtimeSpec(rootfs string) (*specs.Spec, error) {
if c.OS != "linux" {
return nil, fmt.Errorf("%s: unsupported OS", c.OS)
}
var s specs.Spec
s.Version = specs.Version
// we should at least apply the default spec, otherwise this is totally useless
s.Process.Terminal = true
s.Root.Path = rootfs
s.Process.Cwd = "/"
if c.Config.WorkingDir != "" {
s.Process.Cwd = c.Config.WorkingDir
}
s.Process.Env = append(s.Process.Env, c.Config.Env...)
s.Process.Args = append(s.Process.Args, c.Config.Entrypoint...)
s.Process.Args = append(s.Process.Args, c.Config.Cmd...)
if len(s.Process.Args) == 0 {
s.Process.Args = append(s.Process.Args, "sh")
}
if uid, err := strconv.Atoi(c.Config.User); err == nil {
s.Process.User.UID = uint32(uid)
} else if ug := strings.Split(c.Config.User, ":"); len(ug) == 2 {
uid, err := strconv.Atoi(ug[0])
if err != nil {
return nil, errors.New("config.User: unsupported uid format")
}
gid, err := strconv.Atoi(ug[1])
if err != nil {
return nil, errors.New("config.User: unsupported gid format")
}
s.Process.User.UID = uint32(uid)
s.Process.User.GID = uint32(gid)
} else if c.Config.User != "" {
return nil, errors.New("config.User: unsupported format")
}
s.Platform.OS = c.OS
s.Platform.Arch = c.Architecture
s.Linux = &specs.Linux{}
for vol := range c.Config.Volumes {
s.Mounts = append(
s.Mounts,
specs.Mount{
Destination: vol,
Type: "bind",
Options: []string{"rbind"},
},
)
}
return &s, nil
}

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vendor/github.com/opencontainers/image-tools/image/descriptor.go generated vendored Normal file
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// 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 image
import (
"encoding/json"
"fmt"
"io"
"os"
"path/filepath"
"strings"
"github.com/opencontainers/go-digest"
"github.com/pkg/errors"
)
type descriptor struct {
MediaType string `json:"mediaType"`
Digest string `json:"digest"`
Size int64 `json:"size"`
}
func (d *descriptor) algo() string {
pts := strings.SplitN(d.Digest, ":", 2)
if len(pts) != 2 {
return ""
}
return pts[0]
}
func (d *descriptor) hash() string {
pts := strings.SplitN(d.Digest, ":", 2)
if len(pts) != 2 {
return ""
}
return pts[1]
}
func listReferences(w walker) (map[string]*descriptor, error) {
refs := make(map[string]*descriptor)
if err := w.walk(func(path string, info os.FileInfo, r io.Reader) error {
if info.IsDir() || !strings.HasPrefix(path, "refs") {
return nil
}
var d descriptor
if err := json.NewDecoder(r).Decode(&d); err != nil {
return err
}
refs[info.Name()] = &d
return nil
}); err != nil {
return nil, err
}
return refs, nil
}
func findDescriptor(w walker, name string) (*descriptor, error) {
var d descriptor
dpath := filepath.Join("refs", name)
switch err := w.walk(func(path string, info os.FileInfo, r io.Reader) error {
if info.IsDir() || filepath.Clean(path) != dpath {
return nil
}
if err := json.NewDecoder(r).Decode(&d); err != nil {
return err
}
return errEOW
}); err {
case nil:
return nil, fmt.Errorf("%s: descriptor not found", dpath)
case errEOW:
return &d, nil
default:
return nil, err
}
}
func (d *descriptor) validate(w walker, mts []string) error {
var found bool
for _, mt := range mts {
if d.MediaType == mt {
found = true
break
}
}
if !found {
return fmt.Errorf("invalid descriptor MediaType %q", d.MediaType)
}
rc, err := w.Get(*d)
if err != nil {
return err
}
defer rc.Close()
return d.validateContent(rc)
}
func (d *descriptor) validateContent(r io.Reader) error {
parsed, err := digest.Parse(d.Digest)
if err != nil {
return err
}
verifier := parsed.Verifier()
n, err := io.Copy(verifier, r)
if err != nil {
return errors.Wrap(err, "error generating hash")
}
if n != d.Size {
return errors.New("size mismatch")
}
if !verifier.Verified() {
return errors.New("digest mismatch")
}
return nil
}

16
vendor/github.com/opencontainers/image-tools/image/doc.go generated vendored Normal file
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// 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 image defines methods for validating, and unpacking OCI images.
package image

210
vendor/github.com/opencontainers/image-tools/image/image.go generated vendored Normal file
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// 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 image
import (
"encoding/json"
"fmt"
"log"
"os"
"path/filepath"
"github.com/opencontainers/image-spec/specs-go/v1"
"github.com/pkg/errors"
)
// ValidateLayout walks through the given file tree and validates the manifest
// pointed to by the given refs or returns an error if the validation failed.
func ValidateLayout(src string, refs []string, out *log.Logger) error {
return validate(newPathWalker(src), refs, out)
}
// Validate walks through the given .tar file and validates the manifest
// pointed to by the given refs or returns an error if the validation failed.
func Validate(tarFile string, refs []string, out *log.Logger) error {
f, err := os.Open(tarFile)
if err != nil {
return errors.Wrap(err, "unable to open file")
}
defer f.Close()
return validate(newTarWalker(tarFile, f), refs, out)
}
var validRefMediaTypes = []string{
v1.MediaTypeImageManifest,
v1.MediaTypeImageManifestList,
}
func validate(w walker, refs []string, out *log.Logger) error {
ds, err := listReferences(w)
if err != nil {
return err
}
if len(refs) == 0 && len(ds) == 0 {
// TODO(runcom): ugly, we'll need a better way and library
// to express log levels.
// see https://github.com/opencontainers/image-spec/issues/288
out.Print("WARNING: no descriptors found")
}
if len(refs) == 0 {
for ref := range ds {
refs = append(refs, ref)
}
}
for _, ref := range refs {
d, ok := ds[ref]
if !ok {
// TODO(runcom):
// soften this error to a warning if the user didn't ask for any specific reference
// with --ref but she's just validating the whole image.
return fmt.Errorf("reference %s not found", ref)
}
if err = d.validate(w, validRefMediaTypes); err != nil {
return err
}
m, err := findManifest(w, d)
if err != nil {
return err
}
if err := m.validate(w); err != nil {
return err
}
if out != nil {
out.Printf("reference %q: OK", ref)
}
}
return nil
}
// UnpackLayout walks through the file tree given by src and, using the layers
// specified in the manifest pointed to by the given ref, unpacks all layers in
// the given destination directory or returns an error if the unpacking failed.
func UnpackLayout(src, dest, ref string) error {
return unpack(newPathWalker(src), dest, ref)
}
// Unpack walks through the given .tar file and, using the layers specified in
// the manifest pointed to by the given ref, unpacks all layers in the given
// destination directory or returns an error if the unpacking failed.
func Unpack(tarFile, dest, ref string) error {
f, err := os.Open(tarFile)
if err != nil {
return errors.Wrap(err, "unable to open file")
}
defer f.Close()
return unpack(newTarWalker(tarFile, f), dest, ref)
}
func unpack(w walker, dest, refName string) error {
ref, err := findDescriptor(w, refName)
if err != nil {
return err
}
if err = ref.validate(w, validRefMediaTypes); err != nil {
return err
}
m, err := findManifest(w, ref)
if err != nil {
return err
}
if err = m.validate(w); err != nil {
return err
}
return m.unpack(w, dest)
}
// CreateRuntimeBundleLayout walks through the file tree given by src and
// creates an OCI runtime bundle in the given destination dest
// or returns an error if the unpacking failed.
func CreateRuntimeBundleLayout(src, dest, ref, root string) error {
return createRuntimeBundle(newPathWalker(src), dest, ref, root)
}
// CreateRuntimeBundle walks through the given .tar file and
// creates an OCI runtime bundle in the given destination dest
// or returns an error if the unpacking failed.
func CreateRuntimeBundle(tarFile, dest, ref, root string) error {
f, err := os.Open(tarFile)
if err != nil {
return errors.Wrap(err, "unable to open file")
}
defer f.Close()
return createRuntimeBundle(newTarWalker(tarFile, f), dest, ref, root)
}
func createRuntimeBundle(w walker, dest, refName, rootfs string) error {
ref, err := findDescriptor(w, refName)
if err != nil {
return err
}
if err = ref.validate(w, validRefMediaTypes); err != nil {
return err
}
m, err := findManifest(w, ref)
if err != nil {
return err
}
if err = m.validate(w); err != nil {
return err
}
c, err := findConfig(w, &m.Config)
if err != nil {
return err
}
if _, err = os.Stat(dest); err != nil {
if os.IsNotExist(err) {
if err2 := os.MkdirAll(dest, 0755); err2 != nil {
return err2
}
} else {
return err
}
}
err = m.unpack(w, filepath.Join(dest, rootfs))
if err != nil {
return err
}
spec, err := c.runtimeSpec(rootfs)
if err != nil {
return err
}
f, err := os.Create(filepath.Join(dest, "config.json"))
if err != nil {
return err
}
defer f.Close()
return json.NewEncoder(f).Encode(spec)
}

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vendor/github.com/opencontainers/image-tools/image/manifest.go generated vendored Normal file
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// 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 image
import (
"archive/tar"
"bytes"
"compress/gzip"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
"strings"
"time"
"github.com/opencontainers/image-spec/schema"
"github.com/opencontainers/image-spec/specs-go/v1"
"github.com/pkg/errors"
)
type manifest struct {
Config descriptor `json:"config"`
Layers []descriptor `json:"layers"`
}
func findManifest(w walker, d *descriptor) (*manifest, error) {
var m manifest
mpath := filepath.Join("blobs", d.algo(), d.hash())
switch err := w.walk(func(path string, info os.FileInfo, r io.Reader) error {
if info.IsDir() || filepath.Clean(path) != mpath {
return nil
}
buf, err := ioutil.ReadAll(r)
if err != nil {
return errors.Wrapf(err, "%s: error reading manifest", path)
}
if err := schema.MediaTypeManifest.Validate(bytes.NewReader(buf)); err != nil {
return errors.Wrapf(err, "%s: manifest validation failed", path)
}
if err := json.Unmarshal(buf, &m); err != nil {
return err
}
return errEOW
}); err {
case nil:
return nil, fmt.Errorf("%s: manifest not found", mpath)
case errEOW:
return &m, nil
default:
return nil, err
}
}
func (m *manifest) validate(w walker) error {
if err := m.Config.validate(w, []string{v1.MediaTypeImageConfig}); err != nil {
return errors.Wrap(err, "config validation failed")
}
validLayerMediaTypes := []string{
v1.MediaTypeImageLayer,
v1.MediaTypeImageLayerGzip,
v1.MediaTypeImageLayerNonDistributable,
v1.MediaTypeImageLayerNonDistributableGzip,
}
for _, d := range m.Layers {
if err := d.validate(w, validLayerMediaTypes); err != nil {
return errors.Wrap(err, "layer validation failed")
}
}
return nil
}
func (m *manifest) unpack(w walker, dest string) (retErr error) {
// error out if the dest directory is not empty
s, err := ioutil.ReadDir(dest)
if err != nil && !os.IsNotExist(err) {
return errors.Wrap(err, "unable to open file") // err contains dest
}
if len(s) > 0 {
return fmt.Errorf("%s is not empty", dest)
}
defer func() {
// if we encounter error during unpacking
// clean up the partially-unpacked destination
if retErr != nil {
if err := os.RemoveAll(dest); err != nil {
fmt.Printf("Error: failed to remove partially-unpacked destination %v", err)
}
}
}()
for _, d := range m.Layers {
switch err := w.walk(func(path string, info os.FileInfo, r io.Reader) error {
if info.IsDir() {
return nil
}
dd, err := filepath.Rel(filepath.Join("blobs", d.algo()), filepath.Clean(path))
if err != nil || d.hash() != dd {
return nil
}
if err := unpackLayer(dest, r); err != nil {
return errors.Wrap(err, "error extracting layer")
}
return errEOW
}); err {
case nil:
return fmt.Errorf("%s: layer not found", dest)
case errEOW:
default:
return err
}
}
return nil
}
func unpackLayer(dest string, r io.Reader) error {
entries := make(map[string]bool)
gz, err := gzip.NewReader(r)
if err != nil {
return errors.Wrap(err, "error creating gzip reader")
}
defer gz.Close()
var dirs []*tar.Header
tr := tar.NewReader(gz)
loop:
for {
hdr, err := tr.Next()
switch err {
case io.EOF:
break loop
case nil:
// success, continue below
default:
return errors.Wrapf(err, "error advancing tar stream")
}
hdr.Name = filepath.Clean(hdr.Name)
if !strings.HasSuffix(hdr.Name, string(os.PathSeparator)) {
// Not the root directory, ensure that the parent directory exists
parent := filepath.Dir(hdr.Name)
parentPath := filepath.Join(dest, parent)
if _, err2 := os.Lstat(parentPath); err2 != nil && os.IsNotExist(err2) {
if err3 := os.MkdirAll(parentPath, 0755); err3 != nil {
return err3
}
}
}
path := filepath.Join(dest, hdr.Name)
if entries[path] {
return fmt.Errorf("duplicate entry for %s", path)
}
entries[path] = true
rel, err := filepath.Rel(dest, path)
if err != nil {
return err
}
info := hdr.FileInfo()
if strings.HasPrefix(rel, ".."+string(os.PathSeparator)) {
return fmt.Errorf("%q is outside of %q", hdr.Name, dest)
}
if strings.HasPrefix(info.Name(), ".wh.") {
path = strings.Replace(path, ".wh.", "", 1)
if err := os.RemoveAll(path); err != nil {
return errors.Wrap(err, "unable to delete whiteout path")
}
continue loop
}
switch hdr.Typeflag {
case tar.TypeDir:
if fi, err := os.Lstat(path); !(err == nil && fi.IsDir()) {
if err2 := os.MkdirAll(path, info.Mode()); err2 != nil {
return errors.Wrap(err2, "error creating directory")
}
}
case tar.TypeReg, tar.TypeRegA:
f, err := os.OpenFile(path, os.O_CREATE|os.O_WRONLY, info.Mode())
if err != nil {
return errors.Wrap(err, "unable to open file")
}
if _, err := io.Copy(f, tr); err != nil {
f.Close()
return errors.Wrap(err, "unable to copy")
}
f.Close()
case tar.TypeLink:
target := filepath.Join(dest, hdr.Linkname)
if !strings.HasPrefix(target, dest) {
return fmt.Errorf("invalid hardlink %q -> %q", target, hdr.Linkname)
}
if err := os.Link(target, path); err != nil {
return err
}
case tar.TypeSymlink:
target := filepath.Join(filepath.Dir(path), hdr.Linkname)
if !strings.HasPrefix(target, dest) {
return fmt.Errorf("invalid symlink %q -> %q", path, hdr.Linkname)
}
if err := os.Symlink(hdr.Linkname, path); err != nil {
return err
}
case tar.TypeXGlobalHeader:
return nil
}
// Directory mtimes must be handled at the end to avoid further
// file creation in them to modify the directory mtime
if hdr.Typeflag == tar.TypeDir {
dirs = append(dirs, hdr)
}
}
for _, hdr := range dirs {
path := filepath.Join(dest, hdr.Name)
finfo := hdr.FileInfo()
// I believe the old version was using time.Now().UTC() to overcome an
// invalid error from chtimes.....but here we lose hdr.AccessTime like this...
if err := os.Chtimes(path, time.Now().UTC(), finfo.ModTime()); err != nil {
return errors.Wrap(err, "error changing time")
}
}
return nil
}

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vendor/github.com/opencontainers/image-tools/image/project.go generated vendored Normal file
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// 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 image
// SpecURL is the URL for the image-spec repository
var SpecURL = "https://github.com/opencontainers/image-spec"
// IssuesURL is the URL for the issues of image-tools
var IssuesURL = "https://github.com/opencontainers/image-tools/issues"

84
vendor/github.com/opencontainers/image-tools/image/reader.go generated vendored Normal file
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// 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 image
import (
"archive/tar"
"bytes"
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
)
type reader interface {
Get(desc descriptor) (io.ReadCloser, error)
}
type tarReader struct {
name string
}
func (r *tarReader) Get(desc descriptor) (io.ReadCloser, error) {
f, err := os.Open(r.name)
if err != nil {
return nil, err
}
defer f.Close()
tr := tar.NewReader(f)
loop:
for {
hdr, err := tr.Next()
switch err {
case io.EOF:
break loop
case nil:
// success, continue below
default:
return nil, err
}
if hdr.Name == filepath.Join("blobs", desc.algo(), desc.hash()) &&
!hdr.FileInfo().IsDir() {
buf, err := ioutil.ReadAll(tr)
if err != nil {
return nil, err
}
return ioutil.NopCloser(bytes.NewReader(buf)), nil
}
}
return nil, fmt.Errorf("object not found")
}
type layoutReader struct {
root string
}
func (r *layoutReader) Get(desc descriptor) (io.ReadCloser, error) {
name := filepath.Join(r.root, "blobs", desc.algo(), desc.hash())
info, err := os.Stat(name)
if err != nil {
return nil, err
}
if info.IsDir() {
return nil, fmt.Errorf("object is dir")
}
return os.Open(name)
}

121
vendor/github.com/opencontainers/image-tools/image/walker.go generated vendored Normal file
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// 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 image
import (
"archive/tar"
"fmt"
"io"
"os"
"path/filepath"
"github.com/pkg/errors"
)
var (
errEOW = fmt.Errorf("end of walk") // error to signal stop walking
)
// walkFunc is a function type that gets called for each file or directory visited by the Walker.
type walkFunc func(path string, _ os.FileInfo, _ io.Reader) error
// walker is the interface that walks through a file tree,
// calling walk for each file or directory in the tree.
type walker interface {
walk(walkFunc) error
reader
}
type tarWalker struct {
r io.ReadSeeker
tarReader
}
// newTarWalker returns a Walker that walks through .tar files.
func newTarWalker(tarFile string, r io.ReadSeeker) walker {
return &tarWalker{r, tarReader{name: tarFile}}
}
func (w *tarWalker) walk(f walkFunc) error {
if _, err := w.r.Seek(0, os.SEEK_SET); err != nil {
return errors.Wrapf(err, "unable to reset")
}
tr := tar.NewReader(w.r)
loop:
for {
hdr, err := tr.Next()
switch err {
case io.EOF:
break loop
case nil:
// success, continue below
default:
return errors.Wrapf(err, "error advancing tar stream")
}
info := hdr.FileInfo()
if err := f(hdr.Name, info, tr); err != nil {
return err
}
}
return nil
}
type eofReader struct{}
func (eofReader) Read(_ []byte) (int, error) {
return 0, io.EOF
}
type pathWalker struct {
root string
layoutReader
}
// newPathWalker returns a Walker that walks through directories
// starting at the given root path. It does not follow symlinks.
func newPathWalker(root string) walker {
return &pathWalker{root, layoutReader{root: root}}
}
func (w *pathWalker) walk(f walkFunc) error {
return filepath.Walk(w.root, func(path string, info os.FileInfo, err error) error {
// MUST check error value, to make sure the `os.FileInfo` is available.
// Otherwise panic risk will exist.
if err != nil {
return errors.Wrap(err, "error walking path")
}
rel, err := filepath.Rel(w.root, path)
if err != nil {
return errors.Wrap(err, "error walking path") // err from filepath.Walk includes path name
}
if info.IsDir() { // behave like a tar reader for directories
return f(rel, info, eofReader{})
}
file, err := os.Open(path)
if err != nil {
return errors.Wrap(err, "unable to open file") // os.Open includes the path
}
defer file.Close()
return f(rel, info, file)
})
}