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layer: document Windows-specific file attributes #703

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10 changes: 10 additions & 0 deletions layer.md
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With this approach, the link map and links names of a directory could be compared against that of another directory to derive additions and changes to hardlinks.

#### Platform-specific attributes

Implementations on Windows MUST support these additional attributes, encoded in [PAX vendor
extensions](https://github.com/libarchive/libarchive/wiki/ManPageTar5#pax-interchange-format) as follows:

* [Windows file attributes](https://msdn.microsoft.com/en-us/library/windows/desktop/gg258117(v=vs.85).aspx) (`MSWINDOWS.fileattr`)
* [Security descriptor](https://msdn.microsoft.com/en-us/library/cc230366.aspx) (`MSWINDOWS.rawsd`): base64-encoded self-relative binary security descriptor
* Mount points (`MSWINDOWS.mountpoint`): if present on a directory symbolic link, then the link should be created as a [directory junction](https://en.wikipedia.org/wiki/NTFS_junction_point)
* Creation time (`LIBARCHIVE.creationtime`)

## Creating

### Initial Root Filesystem
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