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layer is compressed tar format #518

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2 changes: 1 addition & 1 deletion config.md
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Expand Up @@ -12,7 +12,7 @@ This specification uses the following terms:
### [Layer](layer.md)

Image filesystems are composed of *layers*.
Each layer represents a set of filesystem changes in a tar-based [layer format](layer.md), recording files to be added, changed, or deleted relative to its parent layer.
Each layer represents a set of filesystem changes in a compressed tar-based [layer format](layer.md), recording files to be added, changed, or deleted relative to its parent layer.
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This is currently covered here, and will no longer be true if/when #388 lands. In any event, compression seems like a property of the later media type, and not a fundamental property of “being a layer”.

Layers do not have configuration metadata such as environment variables or default arguments - these are properties of the image as a whole rather than any particular layer.
Using a layer-based or union filesystem such as AUFS, or by computing the diff from filesystem snapshots, the filesystem changeset can be used to present a series of image layers as if they were one cohesive filesystem.

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