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Date: Thu, 20 Dec 2018 23:22:41 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: [ANNOUNCEMENT] attr 2.4.48-2
Message-ID: <20181220222241.GA3310@calimero.vinschen.de>
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References: <announce DOT 20181220110408 DOT 24226-1-corinna-cygwin AT cygwin DOT com> <792facca-bc23-d5c0-76af-336a95e455c1 AT SystematicSw DOT ab DOT ca>
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On Dec 20 09:03, Brian Inglis wrote:
> On 2018-12-20 03:04, Corinna Vinschen wrote:
> > The following packages have been uploaded to the Cygwin distribution:
> >=20
> > * attr-2.4.48-2
> > * libattr-devel-2.4.48-2
> > * libattr1-2.4.48-2
>=20
> Does this release support listing Windows Alternate Data Streams, as the =
Linux
> release does with Tuxera NTFS-3G?

libattr only supports reading and writing EAs, it has no capabilities to
read or write ADS.  Ntfs-3g supports the streams_interface=3Dwindows
option which allows to read ADS.  This also adds the ntfs.streams.list
EA to a file with named ADS.  So attr/getfattr can only inspect the
ntfs.streams.list EA because the NTFS-3G driver creates them on the fly
when inspecting the file EAs.

tl;dr: No, sorry.  This could only work if Cygwin fakes the
ntfs.streams.list EA per file just like the NTFS-3G driver.

Patches welcome.  Looks like a nice little project if you want to get
your hands dirty.  The functions to handle EAs are pretty
self-sufficiently implemented in ntea.cc.  A little loop about
NtQueryInformationFile(FileStreamInformation) should do it.


Corinna

--=20
Corinna Vinschen
Cygwin Maintainer

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