From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Federico Tedin <federicotedin@gmail.com>
Cc: 35495@debbugs.gnu.org, Daiki Ueno <ueno@unixuser.org>
Subject: bug#35495: 27.0.50; Untarring an archive with a keyring.gpg inside
Date: Sat, 11 May 2019 08:54:47 -0400 [thread overview]
Message-ID: <jwvmujt88c7.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <87d0kp91fn.fsf@gmail.com> (Federico Tedin's message of "Fri, 10 May 2019 23:20:44 -0300")
>> Instead, you should state the property you want, and then let each
>> file-name-handler decide how to handle that property. E.g.:
>>
>> (let ((write-region-provides-raw-file-contents t))
>> (write-region ...))
>>
>> Of course, the problem here is that by using dynamic scoping, this var
>> will affect all write-regions that will take place during this call,
>> which might lead to more problems.
>
> I see, I hadn't realized that tar-mode still used dynamic scoping (I
> imagine converting it to lexical is a lot of work).
All files use dynamically scoped variables. `lexical-binding` only
determines the scoping to use for those vars that aren't declared as
dynamically scoped. The fact that tar-mode.el hasn't (yet) been
converted to use lexical-binding has no effect on the above example
(because I presume there that write-region-provides-raw-file-contents
would be a variable declared somewhere in files.el as being dynamically
scoped, like file-name-handler-alist).
>> Maybe it would be better to have it as an argument to `write-region`, or
>> to introduce a new function?
>>
>> Or maybe, not use `write-region` but `copy-file` instead (which already
>> provides the expected semantics (i.e. it doesn't (un)compress or
>> (en/de)crypt, IIUC).
>
> It looks like `copy-file` only deals with files and not buffers, so we
> would need to find a way to use it from tar-mode.
I know. Maybe we can extend it to allow the source to be a buffer?
> Looking at the source in fileio.c, it also seems like it uses
> `find-file-name-handler` for `FILE` or `NEWNAME`, so it's possible it
> won't be useful for us.
Not sure why you think that could make it not useful.
> If we added a new argument to `write-region` like you mentioned, say
> `RAW`, could we then use symbol properties to decide whether the found
> file name handler can be used or not?
No, no: we do want the file-name-handler to be called.
We just want it to receive enough info to determine how it will do its
job (e.g. whether it needs to compress/encrypt the data or not).
Stefan
next prev parent reply other threads:[~2019-05-11 12:54 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-29 20:02 bug#35495: 27.0.50; Untarring an archive with a keyring.gpg inside Stefan Monnier
2019-05-08 22:26 ` Federico Tedin
2019-05-09 0:53 ` Stefan Monnier
2019-05-09 23:00 ` Federico Tedin
2019-05-10 0:24 ` Stefan Monnier
2019-05-11 0:26 ` Federico Tedin
2019-05-11 0:37 ` Stefan Monnier
2019-05-11 1:43 ` Federico Tedin
2019-05-11 1:54 ` Stefan Monnier
2019-05-11 2:20 ` Federico Tedin
2019-05-11 12:54 ` Stefan Monnier [this message]
2019-05-11 16:24 ` Federico Tedin
2019-05-11 6:48 ` Eli Zaretskii
2019-05-11 12:55 ` Stefan Monnier
2019-05-11 13:06 ` Eli Zaretskii
2019-05-11 14:10 ` Stefan Monnier
2019-05-11 14:22 ` Eli Zaretskii
2019-05-11 19:55 ` Stefan Monnier
2019-05-12 4:20 ` Eli Zaretskii
2019-05-12 15:23 ` Stefan Monnier
2019-05-12 15:57 ` Eli Zaretskii
2022-04-22 13:13 ` Lars Ingebrigtsen
2022-04-22 13:40 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-04-22 14:18 ` Lars Ingebrigtsen
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