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Add some helper text for magical ADD 

Closes: #15777

Signed-off-by: Doug Davis <dug@us.ibm.com>
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Doug Davis 2016-01-22 08:52:36 -08:00 committed by Tibor Vass
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commit fc57c3a419
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docs/reference/builder.md
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@ -643,6 +643,14 @@ guide](../articles/dockerfile_best-practices.md#build-cache) for more informatio
2. The contents of the source tree, with conflicts resolved in favor 2. The contents of the source tree, with conflicts resolved in favor
of "2." on a file-by-file basis. of "2." on a file-by-file basis.
> **Note**:
> Whether a file is identified as a recognized compression format or not
> is done soley based on the contents of the file, not the name of the file.
> For example, if an empty file happens to end with `.tar.gz` this will not
> be recognized as a compressed file and **will not** generate any kind of
> decompression error message, rather the file will simply be copied to the
> destination.
- If `<src>` is any other kind of file, it is copied individually along with - If `<src>` is any other kind of file, it is copied individually along with
its metadata. In this case, if `<dest>` ends with a trailing slash `/`, it its metadata. In this case, if `<dest>` ends with a trailing slash `/`, it
will be considered a directory and the contents of `<src>` will be written will be considered a directory and the contents of `<src>` will be written