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vendor oci image-spec 

Signed-off-by: Mike Brown <brownwm@us.ibm.com>
master
Mike Brown 2017-07-11 14:20:34 -05:00
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@ -49,3 +49,4 @@ gopkg.in/square/go-jose.v1 40d457b439244b546f023d056628e5184136899b
gopkg.in/yaml.v2 bef53efd0c76e49e6de55ead051f886bea7e9420
rsc.io/letsencrypt e770c10b0f1a64775ae91d240407ce00d1a5bdeb https://github.com/dmcgowan/letsencrypt.git
github.com/opencontainers/go-digest a6d0ee40d4207ea02364bd3b9e8e77b9159ba1eb
github.com/opencontainers/image-spec e0536ae0cb47b8fed6afdaa9ba2589f6bd915caa

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# OCI Image Format Specification
<div>
<a href="https://travis-ci.org/opencontainers/image-spec">
<img src="https://travis-ci.org/opencontainers/image-spec.svg?branch=master"></img>
</a>
</div>
The OCI Image Format project creates and maintains the software shipping container image format spec (OCI Image Format).
**[The specification can be found here](spec.md).**
This repository also provides [Go types](specs-go), [intra-blob validation tooling, and JSON Schema](schema).
The Go types and validation should be compatible with the current Go release; earlier Go releases are not supported.
Additional documentation about how this group operates:
- [Code of Conduct](https://github.com/opencontainers/tob/blob/d2f9d68c1332870e40693fe077d311e0742bc73d/code-of-conduct.md)
- [Roadmap](#roadmap)
- [Releases](RELEASES.md)
- [Project Documentation](project.md)
The _optional_ and _base_ layers of all OCI projects are tracked in the [OCI Scope Table](https://www.opencontainers.org/about/oci-scope-table).
## Running an OCI Image
The OCI Image Format partner project is the [OCI Runtime Spec project](https://github.com/opencontainers/runtime-spec).
The Runtime Specification outlines how to run a "[filesystem bundle](https://github.com/opencontainers/runtime-spec/blob/master/bundle.md)" that is unpacked on disk.
At a high-level an OCI implementation would download an OCI Image then unpack that image into an OCI Runtime filesystem bundle.
At this point the OCI Runtime Bundle would be run by an OCI Runtime.
This entire workflow supports the UX that users have come to expect from container engines like Docker and rkt: primarily, the ability to run an image with no additional arguments:
* docker run example.com/org/app:v1.0.0
* rkt run example.com/org/app,version=v1.0.0
To support this UX the OCI Image Format contains sufficient information to launch the application on the target platform (e.g. command, arguments, environment variables, etc).
## FAQ
**Q: Why doesn't this project mention distribution?**
A: Distribution, for example using HTTP as both Docker v2.2 and AppC do today, is currently out of scope on the [OCI Scope Table](https://www.opencontainers.org/about/oci-scope-table).
There has been [some discussion on the TOB mailing list](https://groups.google.com/a/opencontainers.org/d/msg/tob/A3JnmI-D-6Y/tLuptPDHAgAJ) to make distribution an optional layer, but this topic is a work in progress.
**Q: What happens to AppC or Docker Image Formats?**
A: Existing formats can continue to be a proving ground for technologies, as needed.
The OCI Image Format project strives to provide a dependable open specification that can be shared between different tools and be evolved for years or decades of compatibility; as the deb and rpm format have.
Find more [FAQ on the OCI site](https://www.opencontainers.org/faq).
## Roadmap
The [GitHub milestones](https://github.com/opencontainers/image-spec/milestones) lay out the path to the OCI v1.0.0 release in late 2016.
# Contributing
Development happens on GitHub for the spec.
Issues are used for bugs and actionable items and longer discussions can happen on the [mailing list](#mailing-list).
The specification and code is licensed under the Apache 2.0 license found in the `LICENSE` file of this repository.
## Discuss your design
The project welcomes submissions, but please let everyone know what you are working on.
Before undertaking a nontrivial change to this specification, send mail to the [mailing list](#mailing-list) to discuss what you plan to do.
This gives everyone a chance to validate the design, helps prevent duplication of effort, and ensures that the idea fits.
It also guarantees that the design is sound before code is written; a GitHub pull-request is not the place for high-level discussions.
Typos and grammatical errors can go straight to a pull-request.
When in doubt, start on the [mailing-list](#mailing-list).
## Weekly Call
The contributors and maintainers of all OCI projects have a weekly meeting Wednesdays at 2:00 PM (USA Pacific).
Everyone is welcome to participate via [UberConference web][UberConference] or audio-only: +1-415-968-0849 (no PIN needed).
An initial agenda will be posted to the [mailing list](#mailing-list) earlier in the week, and everyone is welcome to propose additional topics or suggest other agenda alterations there.
Minutes are posted to the [mailing list](#mailing-list) and minutes from past calls are archived [here][minutes].
## Mailing List
You can subscribe and join the mailing list on [Google Groups](https://groups.google.com/a/opencontainers.org/forum/#!forum/dev).
## IRC
OCI discussion happens on #opencontainers on Freenode ([logs][irc-logs]).
## Markdown style
To keep consistency throughout the Markdown files in the Open Container spec all files should be formatted one sentence per line.
This fixes two things: it makes diffing easier with git and it resolves fights about line wrapping length.
For example, this paragraph will span three lines in the Markdown source.
## Git commit
### Sign your work
The sign-off is a simple line at the end of the explanation for the patch, which certifies that you wrote it or otherwise have the right to pass it on as an open-source patch.
The rules are pretty simple: if you can certify the below (from [developercertificate.org](http://developercertificate.org/)):
```
Developer Certificate of Origin
Version 1.1
Copyright (C) 2004, 2006 The Linux Foundation and its contributors.
660 York Street, Suite 102,
San Francisco, CA 94110 USA
Everyone is permitted to copy and distribute verbatim copies of this
license document, but changing it is not allowed.
Developer's Certificate of Origin 1.1
By making a contribution to this project, I certify that:
(a) The contribution was created in whole or in part by me and I
have the right to submit it under the open source license
indicated in the file; or
(b) The contribution is based upon previous work that, to the best
of my knowledge, is covered under an appropriate open source
license and I have the right under that license to submit that
work with modifications, whether created in whole or in part
by me, under the same open source license (unless I am
permitted to submit under a different license), as indicated
in the file; or
(c) The contribution was provided directly to me by some other
person who certified (a), (b) or (c) and I have not modified
it.
(d) I understand and agree that this project and the contribution
are public and that a record of the contribution (including all
personal information I submit with it, including my sign-off) is
maintained indefinitely and may be redistributed consistent with
this project or the open source license(s) involved.
```
then you just add a line to every git commit message:
Signed-off-by: Joe Smith <joe@gmail.com>
using your real name (sorry, no pseudonyms or anonymous contributions.)
You can add the sign off when creating the git commit via `git commit -s`.
### Commit Style
Simple house-keeping for clean git history.
Read more on [How to Write a Git Commit Message](http://chris.beams.io/posts/git-commit/) or the Discussion section of [`git-commit(1)`](http://git-scm.com/docs/git-commit).
1. Separate the subject from body with a blank line
2. Limit the subject line to 50 characters
3. Capitalize the subject line
4. Do not end the subject line with a period
5. Use the imperative mood in the subject line
6. Wrap the body at 72 characters
7. Use the body to explain what and why vs. how
* If there was important/useful/essential conversation or information, copy or include a reference
8. When possible, one keyword to scope the change in the subject (i.e. "README: ...", "runtime: ...")
[UberConference]: https://www.uberconference.com/opencontainers
[irc-logs]: http://ircbot.wl.linuxfoundation.org/eavesdrop/%23opencontainers/
[minutes]: http://ircbot.wl.linuxfoundation.org/meetings/opencontainers/

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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 v1
const (
// AnnotationCreated is the annotation key for the date and time on which the image was built (date-time string as defined by RFC 3339).
AnnotationCreated = "org.opencontainers.image.created"
// AnnotationAuthors is the annotation key for the contact details of the people or organization responsible for the image (freeform string).
AnnotationAuthors = "org.opencontainers.image.authors"
// AnnotationURL is the annotation key for the URL to find more information on the image.
AnnotationURL = "org.opencontainers.image.url"
// AnnotationDocumentation is the annotation key for the URL to get documentation on the image.
AnnotationDocumentation = "org.opencontainers.image.documentation"
// AnnotationSource is the annotation key for the URL to get source code for building the image.
AnnotationSource = "org.opencontainers.image.source"
// AnnotationVersion is the annotation key for the version of the packaged software.
// The version MAY match a label or tag in the source code repository.
// The version MAY be Semantic versioning-compatible.
AnnotationVersion = "org.opencontainers.image.version"
// AnnotationRevision is the annotation key for the source control revision identifier for the packaged software.
AnnotationRevision = "org.opencontainers.image.revision"
// AnnotationVendor is the annotation key for the name of the distributing entity, organization or individual.
AnnotationVendor = "org.opencontainers.image.vendor"
// AnnotationLicenses is the annotation key for the license(s) under which contained software is distributed as an SPDX License Expression.
AnnotationLicenses = "org.opencontainers.image.licenses"
// AnnotationRefName is the annotation key for the name of the reference for a target.
// SHOULD only be considered valid when on descriptors on `index.json` within image layout.
AnnotationRefName = "org.opencontainers.image.ref.name"
// AnnotationTitle is the annotation key for the human-readable title of the image.
AnnotationTitle = "org.opencontainers.image.title"
// AnnotationDescription is the annotation key for the human-readable description of the software packaged in the image.
AnnotationDescription = "org.opencontainers.image.description"
)

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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 v1
import (
"time"
digest "github.com/opencontainers/go-digest"
)
// ImageConfig defines the execution parameters which should be used as a base when running a container using an image.
type ImageConfig struct {
// User defines the username or UID which the process in the container should run as.
User string `json:"User,omitempty"`
// ExposedPorts a set of ports to expose from a container running this image.
ExposedPorts map[string]struct{} `json:"ExposedPorts,omitempty"`
// Env is a list of environment variables to be used in a container.
Env []string `json:"Env,omitempty"`
// Entrypoint defines a list of arguments to use as the command to execute when the container starts.
Entrypoint []string `json:"Entrypoint,omitempty"`
// Cmd defines the default arguments to the entrypoint of the container.
Cmd []string `json:"Cmd,omitempty"`
// Volumes is a set of directories describing where the process is likely write data specific to a container instance.
Volumes map[string]struct{} `json:"Volumes,omitempty"`
// WorkingDir sets the current working directory of the entrypoint process in the container.
WorkingDir string `json:"WorkingDir,omitempty"`
// Labels contains arbitrary metadata for the container.
Labels map[string]string `json:"Labels,omitempty"`
// StopSignal contains the system call signal that will be sent to the container to exit.
StopSignal string `json:"StopSignal,omitempty"`
}
// RootFS describes a layer content addresses
type RootFS struct {
// Type is the type of the rootfs.
Type string `json:"type"`
// DiffIDs is an array of layer content hashes (DiffIDs), in order from bottom-most to top-most.
DiffIDs []digest.Digest `json:"diff_ids"`
}
// History describes the history of a layer.
type History struct {
// Created is the combined date and time at which the layer was created, formatted as defined by RFC 3339, section 5.6.
Created *time.Time `json:"created,omitempty"`
// CreatedBy is the command which created the layer.
CreatedBy string `json:"created_by,omitempty"`
// Author is the author of the build point.
Author string `json:"author,omitempty"`
// Comment is a custom message set when creating the layer.
Comment string `json:"comment,omitempty"`
// EmptyLayer is used to mark if the history item created a filesystem diff.
EmptyLayer bool `json:"empty_layer,omitempty"`
}
// Image is the JSON structure which describes some basic information about the image.
// This provides the `application/vnd.oci.image.config.v1+json` mediatype when marshalled to JSON.
type Image struct {
// Created is the combined date and time at which the image was created, formatted as defined by RFC 3339, section 5.6.
Created *time.Time `json:"created,omitempty"`
// Author defines the name and/or email address of the person or entity which created and is responsible for maintaining the image.
Author string `json:"author,omitempty"`
// Architecture is the CPU architecture which the binaries in this image are built to run on.
Architecture string `json:"architecture"`
// OS is the name of the operating system which the image is built to run on.
OS string `json:"os"`
// Config defines the execution parameters which should be used as a base when running a container using the image.
Config ImageConfig `json:"config,omitempty"`
// RootFS references the layer content addresses used by the image.
RootFS RootFS `json:"rootfs"`
// History describes the history of each layer.
History []History `json:"history,omitempty"`
}

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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 v1
import digest "github.com/opencontainers/go-digest"
// Descriptor describes the disposition of targeted content.
// This structure provides `application/vnd.oci.descriptor.v1+json` mediatype
// when marshalled to JSON.
type Descriptor struct {
// MediaType is the media type of the object this schema refers to.
MediaType string `json:"mediaType,omitempty"`
// Digest is the digest of the targeted content.
Digest digest.Digest `json:"digest"`
// Size specifies the size in bytes of the blob.
Size int64 `json:"size"`
// URLs specifies a list of URLs from which this object MAY be downloaded
URLs []string `json:"urls,omitempty"`
// Annotations contains arbitrary metadata relating to the targeted content.
Annotations map[string]string `json:"annotations,omitempty"`
// Platform describes the platform which the image in the manifest runs on.
//
// This should only be used when referring to a manifest.
Platform *Platform `json:"platform,omitempty"`
}
// Platform describes the platform which the image in the manifest runs on.
type Platform struct {
// Architecture field specifies the CPU architecture, for example
// `amd64` or `ppc64`.
Architecture string `json:"architecture"`
// OS specifies the operating system, for example `linux` or `windows`.
OS string `json:"os"`
// OSVersion is an optional field specifying the operating system
// version, for example on Windows `10.0.14393.1066`.
OSVersion string `json:"os.version,omitempty"`
// OSFeatures is an optional field specifying an array of strings,
// each listing a required OS feature (for example on Windows `win32k`).
OSFeatures []string `json:"os.features,omitempty"`
// Variant is an optional field specifying a variant of the CPU, for
// example `v7` to specify ARMv7 when architecture is `arm`.
Variant string `json:"variant,omitempty"`
}

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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 v1
import "github.com/opencontainers/image-spec/specs-go"
// Index references manifests for various platforms.
// This structure provides `application/vnd.oci.image.index.v1+json` mediatype when marshalled to JSON.
type Index struct {
specs.Versioned
// Manifests references platform specific manifests.
Manifests []Descriptor `json:"manifests"`
// Annotations contains arbitrary metadata for the image index.
Annotations map[string]string `json:"annotations,omitempty"`
}

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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 v1
const (
// ImageLayoutFile is the file name of oci image layout file
ImageLayoutFile = "oci-layout"
// ImageLayoutVersion is the version of ImageLayout
ImageLayoutVersion = "1.0.0"
)
// ImageLayout is the structure in the "oci-layout" file, found in the root
// of an OCI Image-layout directory.
type ImageLayout struct {
Version string `json:"imageLayoutVersion"`
}

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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 v1
import "github.com/opencontainers/image-spec/specs-go"
// Manifest provides `application/vnd.oci.image.manifest.v1+json` mediatype structure when marshalled to JSON.
type Manifest struct {
specs.Versioned
// Config references a configuration object for a container, by digest.
// The referenced configuration object is a JSON blob that the runtime uses to set up the container.
Config Descriptor `json:"config"`
// Layers is an indexed list of layers referenced by the manifest.
Layers []Descriptor `json:"layers"`
// Annotations contains arbitrary metadata for the image manifest.
Annotations map[string]string `json:"annotations,omitempty"`
}

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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 v1
const (
// MediaTypeDescriptor specifies the media type for a content descriptor.
MediaTypeDescriptor = "application/vnd.oci.descriptor.v1+json"
// MediaTypeLayoutHeader specifies the media type for the oci-layout.
MediaTypeLayoutHeader = "application/vnd.oci.layout.header.v1+json"
// MediaTypeImageManifest specifies the media type for an image manifest.
MediaTypeImageManifest = "application/vnd.oci.image.manifest.v1+json"
// MediaTypeImageIndex specifies the media type for an image index.
MediaTypeImageIndex = "application/vnd.oci.image.index.v1+json"
// MediaTypeImageLayer is the media type used for layers referenced by the manifest.
MediaTypeImageLayer = "application/vnd.oci.image.layer.v1.tar"
// MediaTypeImageLayerGzip is the media type used for gzipped layers
// referenced by the manifest.
MediaTypeImageLayerGzip = "application/vnd.oci.image.layer.v1.tar+gzip"
// MediaTypeImageLayerNonDistributable is the media type for layers referenced by
// the manifest but with distribution restrictions.
MediaTypeImageLayerNonDistributable = "application/vnd.oci.image.layer.nondistributable.v1.tar"
// MediaTypeImageLayerNonDistributableGzip is the media type for
// gzipped layers referenced by the manifest but with distribution
// restrictions.
MediaTypeImageLayerNonDistributableGzip = "application/vnd.oci.image.layer.nondistributable.v1.tar+gzip"
// MediaTypeImageConfig specifies the media type for the image configuration.
MediaTypeImageConfig = "application/vnd.oci.image.config.v1+json"
)

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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 specs
import "fmt"
const (
// VersionMajor is for an API incompatible changes
VersionMajor = 1
// VersionMinor is for functionality in a backwards-compatible manner
VersionMinor = 0
// VersionPatch is for backwards-compatible bug fixes
VersionPatch = 0
// VersionDev indicates development branch. Releases will be empty string.
VersionDev = "-rc6-dev"
)
// Version is the specification version that the package types support.
var Version = fmt.Sprintf("%d.%d.%d%s", VersionMajor, VersionMinor, VersionPatch, VersionDev)

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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 specs
// Versioned provides a struct with the manifest schemaVersion and mediaType.
// Incoming content with unknown schema version can be decoded against this
// struct to check the version.
type Versioned struct {
// SchemaVersion is the image manifest schema that this image follows
SchemaVersion int `json:"schemaVersion"`
}