X-Recipient:	archive-cygwin AT delorie DOT com
DomainKey-Signature:	a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:message-id:date:from:mime-version:to:subject
	:references:in-reply-to:content-type; q=dns; s=default; b=CB86+X
	t66NDD/FyXE3purzGolujHD/S+xCNwwA0fsNRj3ccgTkcRbq5JPn4lL7WKnIkYL4
	+ZHgdfvrn+TXpZfPtQSXPG48y6dHn/KuY9sj65XhEUpJF86t5Euo8Qg6XImc7J24
	AKwVqNwpchoo4Z6ykaFB9H+OxD8L04xKvyrPQ=
DKIM-Signature:	v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:message-id:date:from:mime-version:to:subject
	:references:in-reply-to:content-type; s=default; bh=eMbh990u8Ios
	tZUXrtdo+bZCcFA=; b=WsW1FzsKaOh7BWzPpTFw6OvHeyXS7KeBuoyu97kLefH0
	dIY6+RpsWK3Q2H4O1h6lwWzGR7Z1ma4O59qNzKIsJwcBZpKibuvxtqvWMYjku/dN
	jSYzZDI712P4qake/QbinRlN8oHQ5NB7+WgrrTuvqCV8+08+nH9xpzfpEo68NqU=
Mailing-List:	contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Id:	<cygwin.cygwin.com>
List-Subscribe:	<mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive:	<http://sourceware.org/ml/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender:	cygwin-owner AT cygwin DOT com
Mail-Followup-To:	cygwin AT cygwin DOT com
Delivered-To:	mailing list cygwin AT cygwin DOT com
Authentication-Results:	sourceware.org; auth=none
X-Virus-Found:	No
X-Spam-SWARE-Status:	No, score=-5.6 required=5.0 tests=AWL,BAYES_20,KHOP_PGP_SIGNED,KHOP_THREADED,RP_MATCHES_RCVD autolearn=ham version=3.3.2
X-HELO:	mx1.redhat.com
Message-ID:	<5239C62F.6030602@redhat.com>
Date:	Wed, 18 Sep 2013 09:26:39 -0600
From:	Eric Blake <eblake AT redhat DOT com>
User-Agent:	Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130805 Thunderbird/17.0.8
MIME-Version:	1.0
To:	cygwin AT cygwin DOT com
Subject:	Re: cygpath -m behaviour change
References:	<CAF+hkWpba76MxiLzbcfUD=bHs=N=Xbti7vN4qLw7H2BWtWYQYw AT mail DOT gmail DOT com>
In-Reply-To:	<CAF+hkWpba76MxiLzbcfUD=bHs=N=Xbti7vN4qLw7H2BWtWYQYw@mail.gmail.com>
OpenPGP:	url=http://people.redhat.com/eblake/eblake.gpg
X-IsSubscribed:	yes

--IC8gXT352fhAP60nHanlrSprlNaLvc0pt
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

On 09/18/2013 08:34 AM, David Griffiths wrote:
> Hi, the script is attempting to determine the directory in which it
> exists, so CURRENT_DIR is a bit misleading. This is so that it can
> access other files in the same package relative to it (quite a common
> technique I think).
>=20
> Might be helpful to have some examples:
>=20
> /home/dgriff> mkdir test
> /home/dgriff> cd test
> /home/dgriff/test> cygpath -m "file\.."
> ./

Using \ means you are asking Windows to do the resolution, and Windows
has a known issue that it is intentionally NOT posix-compliant unless
you tweak a registry option.  But the fact that you can tweak a registry
option means that you CAN encounter machines where file\.. will fail to
resolve instead of (incorrectly optimizing) to . without first checking
whether "file/" is a directory.

> /home/dgriff/test> cygpath -m "file/.."
> cygpath: error converting "file/.." - No such file or directory

This is POSIX-mandated behavior, and since you used /, you asked for
POSIX semantics.  This is not a bug.

>=20
> Note that the backslash variant always works and all of these used to
> work under previous levels of cygwin.

The backslash variants "work" only so far as the windows registry
setting has not been tweaked to allow windows to use its non-posix
"optimization".

But why are you even using cygpath to try and determine the containing
directory?  'dirname' does that task, in a much more portable manner,
and without having to worry about whether 'file/..' can be abused in
spite of POSIX semantics.

--=20
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


--IC8gXT352fhAP60nHanlrSprlNaLvc0pt
Content-Type: application/pgp-signature; name="signature.asc"
Content-Description: OpenPGP digital signature
Content-Disposition: attachment; filename="signature.asc"

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.14 (GNU/Linux)
Comment: Public key at http://people.redhat.com/eblake/eblake.gpg
Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/

iQEcBAEBCAAGBQJSOcYvAAoJEKeha0olJ0NqM74H/12sUn8gVAP3TqqpdpQVI/Ws
f7ereSBz2cy6Dl+pNNhNzRWxYVSMS2T4gVFLuqoFxYhtsHrqlSx+lsZ1LFYepb/b
Q5mlZUXedO8FnTBRwx4Npe/Wd+LXmtPHhOo8d8yE9DbhaXaSQWSrESZ4lb7M3J+y
Oy4LW2vrNaXRqNghWZIyR9v9R8ShUQTLbL6d2FutEzecwlWUi/+D8G3uG61ReJK5
IEbuds9l0f16MqPHf9dIIqWa5NlI/blWMfeGW9lNzGVeJW5zB/D4StUzbUe+vK63
4nxDbhaK/EgD4rlisea1HJejQ8C40dS6gbthcvQCCT63XOKaplxUyI28ZzXyAU4=
=w5rS
-----END PGP SIGNATURE-----

--IC8gXT352fhAP60nHanlrSprlNaLvc0pt--

- Raw text -