From: Juanma Barranquero <lekktu@gmail.com>
To: Ken Brown <kbrown@cornell.edu>
Cc: "emacs-devel@gnu.org" <emacs-devel@gnu.org>
Subject: Re: [Emacs-diffs] emacs-26 7a8f22b: * test/lisp/url/url-file-tests.el (url-file): Use file:///, not file://.
Date: Fri, 28 Jun 2019 00:30:43 +0200 [thread overview]
Message-ID: <CAAeL0SQyUc-M4favEpCprmHjp6rw6dqgdBu6JpXOp03TjJRhuw@mail.gmail.com> (raw)
In-Reply-To: <9c367baa-841d-24e0-1436-1a8f3a3ed081@cornell.edu>
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On Thu, Jun 27, 2019 at 11:57 PM Ken Brown <kbrown@cornell.edu> wrote:
> This change causes the test to fail on Cygwin. I think the original
"file://"
> is the correct prefix. If concatenated with "/some/file", it yields the
URL
> "file:///some/file". Your version with "file:///" as the prefix yields
> "file:////some/file", which would refer to a local file "//some/file".
It's a long-standing issue. The standard says that two slashes are to be
followed by a hostname, Three slashes, if there's no hostname.
So, in fact, Posix apps should strip the initial slash of an absolute
pathname before concatenating it to file:///
https://tools.ietf.org/html/rfc8089
Appendix B. Example URIs
> The syntax in Section 2 is intended to support file URIs that take
> the following forms:
> Local files:
> o A traditional file URI for a local file with an empty authority.
> This is the most common format in use today. For example:
> * "file:///path/to/file"
https://en.wikipedia.org/wiki/File_URI_scheme#How_many_slashes?
* A valid file URI must therefore begin with either file:/path,
> file:///path or file://hostname/path.
> * file://path (i.e. two slashes, without a hostname) is never correct, but
> is often used.
The test, as it is now, works for the native Windows port and fails for the
Cygwin port. So to work on both, some special-casing will have to be done.
Note that file:/// is already used in several places in the sources.
> Posix says that the meaning of a path name starting with exactly two
slashes is
> implementation-defined. On Cygwin, it's interpreted as a UNC path name,
> referring to a file on a network.
This is not about Posix pathnames, but RFC8089 URI schemes.
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next prev parent reply other threads:[~2019-06-27 22:30 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20190615033014.12012.75126@vcs0.savannah.gnu.org>
[not found] ` <20190615033015.46910210EC@vcs0.savannah.gnu.org>
2019-06-27 21:57 ` [Emacs-diffs] emacs-26 7a8f22b: * test/lisp/url/url-file-tests.el (url-file): Use file:///, not file:// Ken Brown
2019-06-27 22:30 ` Juanma Barranquero [this message]
2019-06-27 23:37 ` Ken Brown
2019-06-28 1:22 ` Juanma Barranquero
2019-06-28 3:13 ` Ken Brown
2019-06-28 4:08 ` Juanma Barranquero
2019-06-28 12:55 ` Ken Brown
2019-06-28 13:00 ` Juanma Barranquero
2019-06-28 13:17 ` Ken Brown
2019-06-28 13:23 ` Juanma Barranquero
2019-06-28 17:27 ` Ken Brown
2019-06-27 23:48 ` Stefan Monnier
2019-06-28 1:25 ` Juanma Barranquero
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