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Date:	Mon, 17 Dec 2018 10:41:22 +0100
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Cc:	Simon Liesenfeld <surgeonde AT yahoo DOT de>
Subject:	Re: symbolic links on Paragon Linux File systems
Message-ID:	<20181217094122.GR28727@calimero.vinschen.de>
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Mail-Followup-To:	cygwin AT cygwin DOT com, Simon Liesenfeld <surgeonde AT yahoo DOT de>
References:	<1823593702 DOT 5343751 DOT 1545034298027 DOT ref AT mail DOT yahoo DOT com> <1823593702 DOT 5343751 DOT 1545034298027 AT mail DOT yahoo DOT com> <20181217093428 DOT GQ28727 AT calimero DOT vinschen DOT de>
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On Dec 17 10:34, Corinna Vinschen wrote:
> On Dec 17 08:11, Simon Liesenfeld via cygwin wrote:
> > Hi all
> >=20
> > There is a commercial ext3-4 file system driver for windowsLinux File
> > Systems f=C3=BCr Windows | Paragon Softwarewhich enable Windows to read=
 an
> > write on native ext3-4 volumes.In General cygwin works perfectly on
> > such volumes,even named pipes work,
> > but Cygwin programs do not interprete those links correctly,which are
> > created on such volumes.whilst symbolic links on native NTFS drives
> > referring files on such volumeswork perfectly.
> > $pwd/cygdrive/e
> >=20
> > $ echo hallo > source
> >=20
> > $ ln -s source sl
> >=20
> > $ cat sl
> > !<symlink>=E2=96=92=E2=96=92source
>=20
> Yes, we can't do that without special knowledge of the FS.  The default
> symlinks on Cygwin are only evaluated correctly if the DOS SYSTEM
> attribute is set.  The ext4 driver can't do that, obviously.
>=20
> Are the native symlinks on an ext4 FS converted to NTFS symlinks
> on the fly by the driver?  Are they visible as symlinks in Windows
> or Cygwin?
>=20
> If so, you could try setting the environment variable CYGWIN to contain
> "winsymlinks:native".  This creates native Windows symlinks rather than
> the special Cygwin POSIX symlinks.  If the driver is handling this
> correctly, it should transparently convert them to ext4 symlinks and
> they should just work.
>=20
>=20
> HTH,
> Corinna

Btw., we might be able to do more.  Can you do me a favor and call

  /lib/csih/getVolInfo <path to any file on the ext4 FS>
=20=20
and paste the result in your reply to the maling list?  Just for
comparison, it should look roughly like this (example native NTFS):

Device Type        : 7
Characteristics    : 20020
Volume Name        : <>
Serial Number      : 3327928886
Max Filenamelength : 255
Filesystemname     : <NTFS>
Flags              : 3e706ff
  FILE_CASE_SENSITIVE_SEARCH  : TRUE
  FILE_CASE_PRESERVED_NAMES   : TRUE
  FILE_UNICODE_ON_DISK        : TRUE
  FILE_PERSISTENT_ACLS        : TRUE
  FILE_FILE_COMPRESSION       : TRUE
  FILE_VOLUME_QUOTAS          : TRUE
  FILE_SUPPORTS_SPARSE_FILES  : TRUE
  FILE_SUPPORTS_REPARSE_POINTS: TRUE
  FILE_SUPPORTS_REMOTE_STORAGE: FALSE
  FILE_VOLUME_IS_COMPRESSED   : FALSE
  FILE_SUPPORTS_OBJECT_IDS    : TRUE
  FILE_SUPPORTS_ENCRYPTION    : TRUE
  FILE_NAMED_STREAMS          : TRUE
  FILE_READ_ONLY_VOLUME       : FALSE
  FILE_SEQUENTIAL_WRITE_ONCE  : FALSE
  FILE_SUPPORTS_TRANSACTIONS  : TRUE

Maybe we can tweak Cygwin to handle the Paragon ext4 driver out of
the box.


Thanks,
Corinna

--=20
Corinna Vinschen
Cygwin Maintainer

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