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WIP: validate: Stub in callback-based validation
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,69 @@ | ||
| // 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 validate provides a framework for validating OCI images. | ||
| package validate | ||
|
|
||
| import ( | ||
| "archive/tar" | ||
| "compress/gzip" | ||
| "fmt" | ||
| "io" | ||
|
|
||
| "github.com/mndrix/tap.go" | ||
| "github.com/opencontainers/image-tools/image/cas" | ||
| "golang.org/x/net/context" | ||
| ) | ||
|
|
||
| func ValidateGzippedLayer(ctx context.Context, harness *tap.T, engine cas.Engine, digest string, strict bool) { | ||
| reader, err := engine.Get(ctx, digest) | ||
| harness.Ok(err == nil, fmt.Sprintf("retrieve %s from CAS", digest)) | ||
| if err != nil { | ||
| return | ||
| } | ||
|
|
||
| gzipReader, err := gzip.NewReader(reader) | ||
| harness.Ok(err == nil, fmt.Sprintf("gzip reader for %s", digest)) | ||
| if err != nil { | ||
| return | ||
| } | ||
|
|
||
| tarReader := tar.NewReader(gzipReader) | ||
| for { | ||
| select { | ||
| case <-ctx.Done(): | ||
| harness.Ok(false, ctx.Err().Error()) | ||
| return | ||
| default: | ||
| } | ||
|
|
||
| header, err := tarReader.Next() | ||
| if err == io.EOF { | ||
| return | ||
| } | ||
| harness.Ok(err == nil, fmt.Sprintf("read tar header from %s", digest)) | ||
| if err != nil { | ||
| return | ||
| } | ||
|
|
||
| message := fmt.Sprintf("ustar typeflag in %s (%q)", digest, header.Typeflag) | ||
| if header.Typeflag < tar.TypeReg || header.Typeflag > tar.TypeFifo { | ||
| harness.Ok(!strict, message) | ||
| } else { | ||
| harness.Ok(true, message) | ||
| } | ||
| } | ||
|
|
||
| return | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,44 @@ | ||
| // 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 validate provides a framework for validating OCI images. | ||
| package validate | ||
|
|
||
| import ( | ||
| "fmt" | ||
|
|
||
| "github.com/mndrix/tap.go" | ||
| "github.com/opencontainers/image-spec/specs-go" | ||
| "github.com/opencontainers/image-tools/image/cas" | ||
| "golang.org/x/net/context" | ||
| ) | ||
|
|
||
| // Validate is a template for validating a CAS object. | ||
| type Validator func(ctx context.Context, harness *tap.T, engine cas.Engine, digest string, strict bool) | ||
|
|
||
| // Validators is a map from media types to an appropriate Validator function. | ||
| var Validators = map[string]Validator{ | ||
| "application/vnd.oci.image.layer.tar+gzip": ValidateGzippedLayer, | ||
| "application/vnd.oci.image.layer.nondistributable.tar+gzip": ValidateGzippedLayer, | ||
| // TODO: fill in other types | ||
| } | ||
|
|
||
| func Validate(ctx context.Context, harness *tap.T, engine cas.Engine, descriptor *specs.Descriptor, strict bool) { | ||
| validator, ok := Validators[descriptor.MediaType] | ||
| harness.Ok(ok, fmt.Sprintf("recognized media type %q", descriptor.MediaType)) | ||
| if !ok { | ||
| return | ||
| } | ||
| validator(ctx, harness, engine, descriptor.Digest, strict) | ||
| } |