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Sep 27, 2016
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layer: clarify that layers are gzipped #316

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3 changes: 2 additions & 1 deletion layer.md
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Expand Up @@ -6,7 +6,7 @@ This document will use a concrete example to illustrate how to create and consum

## Distributable Format

Layer Changesets for the [mediatype](./media-types.md) `application/vnd.oci.image.layer.tar+gzip` MUST be packaged in [tar archive][tar-archive].
Layer Changesets for the [mediatype](./media-types.md) `application/vnd.oci.image.layer.tar+gzip` MUST be packaged in a [tar archive][tar-archive] compressed with [gzip][gzip].
Layer Changesets for the [mediatype](./media-types.md) `application/vnd.oci.image.layer.tar+gzip` MUST NOT include duplicate entries for file paths in the resulting [tar archive][tar-archive].

## Change Types
Expand Down Expand Up @@ -318,3 +318,4 @@ It is implementation-defined whether or not implementations upload layers tagged
[libarchive-tar]: https://github.com/libarchive/libarchive/wiki/ManPageTar5#POSIX_ustar_Archives
[gnu-tar-standard]: http://www.gnu.org/software/tar/manual/html_node/Standard.html
[tar-archive]: https://en.wikipedia.org/wiki/Tar_(computing)
[gzip]: http://www.zlib.org/rfc-gzip.html
2 changes: 1 addition & 1 deletion media-types.md
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Expand Up @@ -7,7 +7,7 @@ The following media types identify the formats described here and their referenc
- `application/vnd.oci.image.manifest.v1+json`: [Image manifest format](manifest.md#image-manifest)
- `application/vnd.oci.image.config.v1+json`: [Container config JSON](config.md)
- `application/vnd.oci.image.layer.tar+gzip`: ["Layer", as a gzipped tar archive](layer.md)
- `application/vnd.oci.image.layer.nondistributable.tar+gzip`: ["Layer", as a gzipped tar that has distribution restrictions](layer.md#non-distributable-layers)
- `application/vnd.oci.image.layer.nondistributable.tar+gzip`: ["Layer", as a gzipped tar archive with distribution restrictions](layer.md#non-distributable-layers)

## Compatibility Matrix

Expand Down