* VC and select-safe-coding-system
@ 2002-09-08 12:03 Andre Spiegel
2002-09-09 0:22 ` Richard Stallman
2002-09-09 14:08 ` Stefan Monnier
0 siblings, 2 replies; 5+ messages in thread
From: Andre Spiegel @ 2002-09-08 12:03 UTC (permalink / raw)
I've been told that on a file under VC control, a user abort in
select-safe-coding-system can lose data. A few days ago, I asked on
this list whether anyone could tell me the precise circumstances when
this happens. I got no reply. So I've tried to create such a situation
myself, but couldn't spot any such problem. I also inspected the code
carefully, but couldn't see any potential difficulties.
If anyone has any more information on this matter, please let me know.
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: VC and select-safe-coding-system
2002-09-08 12:03 VC and select-safe-coding-system Andre Spiegel
@ 2002-09-09 0:22 ` Richard Stallman
2002-09-09 14:08 ` Stefan Monnier
1 sibling, 0 replies; 5+ messages in thread
From: Richard Stallman @ 2002-09-09 0:22 UTC (permalink / raw)
Cc: emacs-devel
I've been told that on a file under VC control, a user abort in
select-safe-coding-system can lose data. A few days ago, I asked on
this list whether anyone could tell me the precise circumstances when
this happens. I got no reply.
I have seen this happen, too. What happened, I think,
is that the file had already been renamed to a backup file.
So there was no longer any file with the visited name.
To see this problem, I think you need to set vc-make-backup-files to t.
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: VC and select-safe-coding-system
2002-09-08 12:03 VC and select-safe-coding-system Andre Spiegel
2002-09-09 0:22 ` Richard Stallman
@ 2002-09-09 14:08 ` Stefan Monnier
2002-09-09 23:34 ` Richard Stallman
1 sibling, 1 reply; 5+ messages in thread
From: Stefan Monnier @ 2002-09-09 14:08 UTC (permalink / raw)
Cc: emacs-devel
> I've been told that on a file under VC control, a user abort in
> select-safe-coding-system can lose data. A few days ago, I asked on
> this list whether anyone could tell me the precise circumstances when
> this happens. I got no reply. So I've tried to create such a situation
> myself, but couldn't spot any such problem. I also inspected the code
> carefully, but couldn't see any potential difficulties.
The only think I remember related to this is a problem that's
independent from VC:
If select-safe-coding-system prompts the user and the user
aborts with C-g, the file might end up "lost".
IIRC, the problem was that when `write-region' is called, the pre-existing
file has already been renamed to its backup name, so when write-region
calls select-safe-coding-system, the file is temporarily absent.
Maybe this bug was "fixed" since my original report by renaming the backup
file back to its non-backup name in case of an abort by the user.
But I think the problem of having a "temporarily missing file" should
be fixed as well (there will always be such a time-window anyway, but
we should make it shorter by making sure we don't prompt the user during
this time).
Stefan
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: VC and select-safe-coding-system
2002-09-09 14:08 ` Stefan Monnier
@ 2002-09-09 23:34 ` Richard Stallman
2002-09-10 19:53 ` Andre Spiegel
0 siblings, 1 reply; 5+ messages in thread
From: Richard Stallman @ 2002-09-09 23:34 UTC (permalink / raw)
Cc: spiegel, emacs-devel
Maybe this bug was "fixed" since my original report by renaming the backup
file back to its non-backup name in case of an abort by the user.
I had forgotten making that change.
That might indeed have fixed it.
But I think the problem of having a "temporarily missing file" should
be fixed as well (there will always be such a time-window anyway, but
we should make it shorter by making sure we don't prompt the user during
this time).
That may require substantial rearrangement. Anyone want to see how much?
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2002-09-10 19:53 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2002-09-08 12:03 VC and select-safe-coding-system Andre Spiegel
2002-09-09 0:22 ` Richard Stallman
2002-09-09 14:08 ` Stefan Monnier
2002-09-09 23:34 ` Richard Stallman
2002-09-10 19:53 ` Andre Spiegel
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