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api/services/images: define images metadata service

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This is a first pass at the metadata required for supporting an image
store. We use a shallow approach to the problem, allowing this
component to centralize the naming. Resources for this image can then be
"snowballed" in for actual implementations. This is better understood
through example.

Let's take pull. One could register the name "docker.io/stevvooe/foo" as
pointing at a particular digest. When instructed to pull or fetch, the
system will notice that no components of that image are present locally.
It can then recursively resolve the resources for that image and fetch
them into the content store. Next time the instruction is issued, the
content will be present so no action will be taken.

Another example is preparing the rootfs. The requirements for a rootfs
can be resolved from a name. These "diff ids" will then be compared with
what is available in the snapshot manager. Any parts of the rootfs, such
as a layer, that isn't available in the snapshotter can be unpacked.
Once this process is satisified, the image will be runnable as a
container.

Signed-off-by: Stephen J Day <stephen.day@docker.com>
This commit is contained in:
Stephen J Day 2017-03-30 16:56:06 -07:00
parent e119f1dc03
commit a5c9d6d41b
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GPG key ID: 67B3DED84EDC823F
6 changed files with 1478 additions and 13 deletions
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24
api/types/descriptor/descriptor.pb.go
View file

@ -42,7 +42,7 @@ const _ = proto.GoGoProtoPackageIsVersion2 // please upgrade the proto package
// oci descriptor found in a manifest.
// See https://godoc.org/github.com/opencontainers/image-spec/specs-go/v1#Descriptor
type Descriptor struct {
MediaType string `protobuf:"bytes,1,opt,name=mediaType,proto3" json:"mediaType,omitempty"`
MediaType string `protobuf:"bytes,1,opt,name=media_type,json=mediaType,proto3" json:"media_type,omitempty"`
Digest github_com_opencontainers_go_digest.Digest `protobuf:"bytes,2,opt,name=digest,proto3,customtype=github.com/opencontainers/go-digest.Digest" json:"digest"`
Size_ int64 `protobuf:"varint,3,opt,name=size,proto3" json:"size,omitempty"`
}
@ -403,20 +403,20 @@ func init() {
}
var fileDescriptorDescriptor = []byte{
// 225 bytes of a gzipped FileDescriptorProto
// 229 bytes of a gzipped FileDescriptorProto
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0x5b, 0x23, 0x01, 0x00, 0x00,
}

2
api/types/descriptor/descriptor.proto
View file

@ -10,7 +10,7 @@ import "gogoproto/gogo.proto";
// oci descriptor found in a manifest.
// See https://godoc.org/github.com/opencontainers/image-spec/specs-go/v1#Descriptor
message Descriptor {
string mediaType = 1;
string media_type = 1;
string digest = 2 [(gogoproto.customtype) = "github.com/opencontainers/go-digest.Digest", (gogoproto.nullable) = false];
int64 size = 3;
}