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config: forbid snapshotting of data volumes #504

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3 changes: 2 additions & 1 deletion config.md
Original file line number Diff line number Diff line change
Expand Up @@ -149,7 +149,8 @@ Note: Any OPTIONAL field MAY also be set to null, which is equivalent to being a
- **Volumes** *object*, OPTIONAL

A set of directories which SHOULD be created as data volumes in a container running this image.
If a file or folder exists within the image with the same path as a data volume, that file or folder will be replaced by the data volume and never be merged.
If a file or folder exists within the image with the same path as a data volume, that file or folder MUST be replaced by the data volume and never be merged.
When a new layer is created from a container that has data volumes, any data within the data volume SHOULD NOT be included in the changeset layer.
**NOTE:** This JSON structure value is unusual because it is a direct JSON serialization of the Go type `map[string]struct{}` and is represented in JSON as an object mapping its keys to an empty object.

- **WorkingDir** *string*, OPTIONAL
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