Merge pull request #336 from RichardScothern/docs
doc/spec: documentation for the Image Manifest V2 formatpull/351/merge
Stephen Day
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# Image Manifest Version 2, Schema 1
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This document outlines the format of of the V2 image manifest. Image manifests
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describe the various constituents of a docker image. Image manifests can be
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serialized to JSON format with the following media types:
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Manifest Type | Media Type
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------------- | -------------
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manifest | "application/vnd.docker.distribution.manifest.v1+json"
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signed manifest | "application/vnd.docker.distribution.manifest.v1+prettyjws"
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*Note that "application/json" will also be accepted for schema 1.*
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References:
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- [Proposal: JSON Registry API V2.1](https://github.com/docker/docker/issues/9015)
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- [Proposal: Provenance step 1 - Transform images for validation and verification](https://github.com/docker/docker/issues/8093)
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## *Manifest* Field Descriptions
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Manifest provides the base accessible fields for working with V2 image format
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in the registry.
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- **`name`** *string*
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name is the name of the image's repository
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- **`tag`** *string*
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tag is the tag of the image
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- **`architecture`** *string*
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architecture is the host architecture on which this image is intended to
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run. This is for information purposes and not currently used by the engine
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- **`fsLayers`** *array*
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fsLayers is a list of filesystem layer blob sums contained in this image.
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An fsLayer is a struct consisting of the following fields
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- **`blobSum`** *digest.Digest*
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blobSum is the digest of the referenced filesystem image layer. A
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digest can be a tarsum or sha256 hash.
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- **`history`** *array*
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history is a list of unstructured historical data for v1 compatibility.
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history is a struct consisting of the following fields
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- **`v1Compatibility`** string
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V1Compatibility is the raw V1 compatibility information. This will
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contain the JSON object describing the V1 of this image.
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- **`schemaVersion`** *int*
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SchemaVersion is the image manifest schema that this image follows.
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## Signed Manifests
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Signed manifests provides an envelope for a signed image manifest. A signed
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manifest consists of an image manifest along with an additional field
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containing the signature of the manifest.
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The docker client can verify signed manifests and displays a message to the user.
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### Signing Manifests
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Image manifests can be signed in two different ways: with a *libtrust* private
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key or an x509 certificate chain. When signing with an x509 certificate chain,
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the public key of the first element in the chain must be the public key
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corresponding with the sign key.
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### Signed Manifest Field Description
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Signed manifests include an image manifest and and a list of signatures generated
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by *libtrust*. A signature consists of the following fields:
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- **`header`** *[JOSE](http://tools.ietf.org/html/draft-ietf-jose-json-web-signature-31#section-2)*
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A [JSON Web Signature](http://self-issued.info/docs/draft-ietf-jose-json-web-signature.html)
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- **`signature`** *string*
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A signature for the image manifest, signed by a *libtrust* private key
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- **`protected`** *string*
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The signed protected header
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## Example Manifest
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*Example showing the official 'hello-world' image manifest.*
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```
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{
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"name": "hello-world",
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"tag": "latest",
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"architecture": "amd64",
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"fsLayers": [
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{
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"blobSum": "sha256:5f70bf18a086007016e948b04aed3b82103a36bea41755b6cddfaf10ace3c6ef"
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},
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{
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"blobSum": "sha256:5f70bf18a086007016e948b04aed3b82103a36bea41755b6cddfaf10ace3c6ef"
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},
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{
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"blobSum": "sha256:cc8567d70002e957612902a8e985ea129d831ebe04057d88fb644857caa45d11"
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},
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{
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"blobSum": "sha256:5f70bf18a086007016e948b04aed3b82103a36bea41755b6cddfaf10ace3c6ef"
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}
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],
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"history": [
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{
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"v1Compatibility": "{\"id\":\"e45a5af57b00862e5ef5782a9925979a02ba2b12dff832fd0991335f4a11e5c5\",\"parent\":\"31cbccb51277105ba3ae35ce33c22b69c9e3f1002e76e4c736a2e8ebff9d7b5d\",\"created\":\"2014-12-31T22:57:59.178729048Z\",\"container\":\"27b45f8fb11795b52e9605b686159729b0d9ca92f76d40fb4f05a62e19c46b4f\",\"container_config\":{\"Hostname\":\"8ce6509d66e2\",\"Domainname\":\"\",\"User\":\"\",\"Memory\":0,\"MemorySwap\":0,\"CpuShares\":0,\"Cpuset\":\"\",\"AttachStdin\":false,\"AttachStdout\":false,\"AttachStderr\":false,\"PortSpecs\":null,\"ExposedPorts\":null,\"Tty\":false,\"OpenStdin\":false,\"StdinOnce\":false,\"Env\":[\"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin\"],\"Cmd\":[\"/bin/sh\",\"-c\",\"#(nop) CMD [/hello]\"],\"Image\":\"31cbccb51277105ba3ae35ce33c22b69c9e3f1002e76e4c736a2e8ebff9d7b5d\",\"Volumes\":null,\"WorkingDir\":\"\",\"Entrypoint\":null,\"NetworkDisabled\":false,\"MacAddress\":\"\",\"OnBuild\":[],\"SecurityOpt\":null,\"Labels\":null},\"docker_version\":\"1.4.1\",\"config\":{\"Hostname\":\"8ce6509d66e2\",\"Domainname\":\"\",\"User\":\"\",\"Memory\":0,\"MemorySwap\":0,\"CpuShares\":0,\"Cpuset\":\"\",\"AttachStdin\":false,\"AttachStdout\":false,\"AttachStderr\":false,\"PortSpecs\":null,\"ExposedPorts\":null,\"Tty\":false,\"OpenStdin\":false,\"StdinOnce\":false,\"Env\":[\"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin\"],\"Cmd\":[\"/hello\"],\"Image\":\"31cbccb51277105ba3ae35ce33c22b69c9e3f1002e76e4c736a2e8ebff9d7b5d\",\"Volumes\":null,\"WorkingDir\":\"\",\"Entrypoint\":null,\"NetworkDisabled\":false,\"MacAddress\":\"\",\"OnBuild\":[],\"SecurityOpt\":null,\"Labels\":null},\"architecture\":\"amd64\",\"os\":\"linux\",\"Size\":0}\n"
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},
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{
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"v1Compatibility": "{\"id\":\"e45a5af57b00862e5ef5782a9925979a02ba2b12dff832fd0991335f4a11e5c5\",\"parent\":\"31cbccb51277105ba3ae35ce33c22b69c9e3f1002e76e4c736a2e8ebff9d7b5d\",\"created\":\"2014-12-31T22:57:59.178729048Z\",\"container\":\"27b45f8fb11795b52e9605b686159729b0d9ca92f76d40fb4f05a62e19c46b4f\",\"container_config\":{\"Hostname\":\"8ce6509d66e2\",\"Domainname\":\"\",\"User\":\"\",\"Memory\":0,\"MemorySwap\":0,\"CpuShares\":0,\"Cpuset\":\"\",\"AttachStdin\":false,\"AttachStdout\":false,\"AttachStderr\":false,\"PortSpecs\":null,\"ExposedPorts\":null,\"Tty\":false,\"OpenStdin\":false,\"StdinOnce\":false,\"Env\":[\"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin\"],\"Cmd\":[\"/bin/sh\",\"-c\",\"#(nop) CMD [/hello]\"],\"Image\":\"31cbccb51277105ba3ae35ce33c22b69c9e3f1002e76e4c736a2e8ebff9d7b5d\",\"Volumes\":null,\"WorkingDir\":\"\",\"Entrypoint\":null,\"NetworkDisabled\":false,\"MacAddress\":\"\",\"OnBuild\":[],\"SecurityOpt\":null,\"Labels\":null},\"docker_version\":\"1.4.1\",\"config\":{\"Hostname\":\"8ce6509d66e2\",\"Domainname\":\"\",\"User\":\"\",\"Memory\":0,\"MemorySwap\":0,\"CpuShares\":0,\"Cpuset\":\"\",\"AttachStdin\":false,\"AttachStdout\":false,\"AttachStderr\":false,\"PortSpecs\":null,\"ExposedPorts\":null,\"Tty\":false,\"OpenStdin\":false,\"StdinOnce\":false,\"Env\":[\"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin\"],\"Cmd\":[\"/hello\"],\"Image\":\"31cbccb51277105ba3ae35ce33c22b69c9e3f1002e76e4c736a2e8ebff9d7b5d\",\"Volumes\":null,\"WorkingDir\":\"\",\"Entrypoint\":null,\"NetworkDisabled\":false,\"MacAddress\":\"\",\"OnBuild\":[],\"SecurityOpt\":null,\"Labels\":null},\"architecture\":\"amd64\",\"os\":\"linux\",\"Size\":0}\n"
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},
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],
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"schemaVersion": 1,
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"signatures": [
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{
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"header": {
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"jwk": {
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"crv": "P-256",
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"kid": "OD6I:6DRK:JXEJ:KBM4:255X:NSAA:MUSF:E4VM:ZI6W:CUN2:L4Z6:LSF4",
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"kty": "EC",
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"x": "3gAwX48IQ5oaYQAYSxor6rYYc_6yjuLCjtQ9LUakg4A",
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"y": "t72ge6kIA1XOjqjVoEOiPPAURltJFBMGDSQvEGVB010"
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},
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"alg": "ES256"
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},
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"signature": "XREm0L8WNn27Ga_iE_vRnTxVMhhYY0Zst_FfkKopg6gWSoTOZTuW4rK0fg_IqnKkEKlbD83tD46LKEGi5aIVFg",
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"protected": "eyJmb3JtYXRMZW5ndGgiOjY2MjgsImZvcm1hdFRhaWwiOiJDbjAiLCJ0aW1lIjoiMjAxNS0wNC0wOFQxODo1Mjo1OVoifQ"
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}
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]
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}
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```
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