bug#24478: 25.1; Regression in 25.1: .tramp_history files are littered in non-$HOME working directories

[Eli Zaretskii <eliz@gnu.org>]

> From: Michael Albinus <michael.albinus@gmx.de>
> Date: Thu, 22 Sep 2016 20:02:59 +0200
> Cc: Ævar Arnfjörð Bjarmason <avarab@gmail.com>,
>  24478@debbugs.gnu.org
> 
> Ævar Arnfjörð Bjarmason <avar@booking.com> writes:
> 
> Hi,
> 
> > There's a regression in 25.1 introduced by 1e04ea9 (although that seems
> > to also have fixed an issue): Now tramp-histfile-override is set to
> > ".tramp_history", which is good, but I would expect it to be created in
> > $HOME on remote hosts.
> >
> > Instead when I e.g.:
> >
> >  1. C-x C-f //ssh:<hostname>:/usr/local/git_tree/sysadmin/
> >  2. Run e.g. magit to make a commit
> >  3. I end up with:
> >
> >     $ echo $PWD/.tramp_history
> >     /usr/local/git_tree/sysadmin/.tramp_history
> >     $ wc -l !$
> >     wc -l $PWD/.tramp_history
> >     34 /usr/local/git_tree/sysadmin/.tramp_history
> 
> Most of the shells I know off use the home directory, when you specify
> just the relative file name ".tramp_history".
> 
> > From reading https://debbugs.gnu.org/cgi/bugreport.cgi?bug=20446 and
> > https://debbugs.gnu.org/cgi/bugreport.cgi?bug=19731#56 this seems like
> > an unintended bug.
> >
> > Just setting:
> >
> >     (setq tramp-histfile-override "~/.tramp_history")
> >
> > Works for me. Now it's always created in ~.
> 
> I have thought about this, when I was fixing bug#19731. Unfortunately,
> there exist shells which cannot expand "~/". Other shells cannot expand
> "$HOME/". So I really don't know a robust default we could offer.
> 
> Maybe one should give this problem more emphasis in the Tramp
> manual. But who reads manuals?

Michael, does the above mean this bug should be closed as wontfix?  It
currently blocks a release, so I'd like to resolve this some way soon.

Thanks.