bug#49283: [PATCH] 27.2; `(call-process "program" null-device ...)' fails over TRAMP from local MS Windows

[Jim Porter]

On Thu, Jul 1, 2021 at 11:37 PM Eli Zaretskii <eliz@gnu.org> wrote:
>
> > From: Jim Porter <jporterbugs@gmail.com>
> > Date: Thu, 1 Jul 2021 12:45:42 -0700
> > Cc: Michael Albinus <michael.albinus@gmx.de>, Lars Ingebrigtsen 
> > <larsi@gnus.org>, 49283@debbugs.gnu.org
> >
> > I'd considered that when writing my initial patch to `call-process',
> > but I wasn't sure what the most-correct way to avoid that would be. It
> > seems we want an encoded path before returning from
> > `encode_current_directory' in order to check that our result is
> > actually accessible. But then that encoded dir gets passed in to
> > `expand-file-name'. If INFILE is an un-encoded absolute path, wouldn't
> > `expand-file-name' be un-encoded as well?
>
> expand-file-name is not a problem, it can deal with encoded file
> names.  The problem is the calls to remove_slash_colon and
> report_file_error: they should receive file names in their internal
> representation.

Right, I was just worried that if I relied on
`encode_current_directory' returning an encoded path,
`expand-file-name' might sometimes return an encoded path (e.g. if
INFILE is a simple relative path like "foo") and sometimes an
unencoded path (e.g. if INFILE is an absolute path). I might be wrong
though, since I didn't look closely at the implementation...

> How about adding a 'bool' argument to encode_current_directory, so
> that the caller could control whether or not it encodes the directory
> file name?  Then you could in this case tell encode_current_directory
> not to encode the directory file name.

Ok, I did that (and renamed it to `get_current_directory' since it
doesn't always encode anymore). How does the attached patch look?

0001-Ensure-call-process-interprets-infile-as-a-local-pat.patch
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