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add description to manifest spec

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This PR add some description to manifest spec.
It clarifies the relationship between `fsLayers` and `history` fields.

Signed-off-by: xiekeyang <xiekeyang@huawei.com>
This commit is contained in:
xiekeyang 2015-09-19 17:44:23 +08:00
parent f8109a78f9
commit da8ef7585d
1 changed files with 6 additions and 2 deletions
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docs/spec/manifest-v2-1.md
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@ -55,18 +55,22 @@ Manifest provides the base accessible fields for working with V2 image format
- **`history`** *array*
history is a list of unstructured historical data for v1 compatibility.
history is a list of unstructured historical data for v1 compatibility. It
contains ID of the image layer and ID of the layer's parent layers.
history is a struct consisting of the following fields
- **`v1Compatibility`** string
V1Compatibility is the raw V1 compatibility information. This will
V1Compatibility is the raw V1 compatibility information. This will
contain the JSON object describing the V1 of this image.
- **`schemaVersion`** *int*
SchemaVersion is the image manifest schema that this image follows.
>**Note**:the length of `history` must be equal to the length of `fsLayers` and
>entries in each are correlated by index.
## Signed Manifests
Signed manifests provides an envelope for a signed image manifest. A signed