add description to manifest spec
This PR add some description to manifest spec. It clarifies the relationship between `fsLayers` and `history` fields. Signed-off-by: xiekeyang <xiekeyang@huawei.com>
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@ -55,18 +55,22 @@ Manifest provides the base accessible fields for working with V2 image format
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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 list of unstructured historical data for v1 compatibility. It
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contains ID of the image layer and ID of the layer's parent layers.
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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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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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>**Note**:the length of `history` must be equal to the length of `fsLayers` and
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>entries in each are correlated by index.
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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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