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From:	NightStrike <nightstrike AT gmail DOT com>
Date:	Sat, 8 Jan 2022 04:14:35 -0500
Message-ID:	<CAF1jjLvKD5DXzgev3-JbtZ-wG5XWipRkJjEmhyTupnCcxWyp7g@mail.gmail.com>
Subject:	Re: Support for ADS (Alternate Data Streams)
To:	cygwin AT cygwin DOT com
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On Wed, Jan 5, 2022, 05:08 Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
wrote:

> On Jan  3 22:40, NightStrike wrote:
> > On Sun, Jan 2, 2022, 15:51 <cygwin AT kosowsky DOT org> wrote:
> >
> > > While I recognize that ADS is not supported by POSIX, I was wondering
> > > what if any support for ADS might exist within Cygwin.
> > >
> > > The last time I looked into this was probably more than a decade ago
> > > but I am seeing (unfortunately) more usage of ADS in the Windows
> > > world, so I was wondering if there has been any effort to support in
> > > Cygwin?
> > >
> > > --
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> >
> >
> > FWIW, ntfs-3g under Linux maps these to extended attributes
>
> Using the EA API as ntfs-3g with the streams_interface=xattr option
> seems like a nice way to allow reading and writing ADS on Cygwin as
> well.
>
> Do you know how ntfs-3g performs the mapping?  For instance, I guess
> that ADS are stored in the user.* namespace?  Does listxattr list ADS or
> does it skip them?  Stuff like that.
>

The ntfs.streams.list attribute contains the stream names, and there's a
shortcut to access them by name with a colon. So if you have a stream named
str and a file named f.txt, you could do 'cat f.txt:str'.

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