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bug#33255: 27.0.50; expand-file-name: default directory expanded twice i
From: |
Glenn Morris |
Subject: |
bug#33255: 27.0.50; expand-file-name: default directory expanded twice if relative |
Date: |
Tue, 27 Nov 2018 00:42:16 -0500 |
User-agent: |
Gnus (www.gnus.org), GNU Emacs (www.gnu.org/software/emacs/) |
Paul Eggert wrote:
> By not saying anything POSIX gives permission to the application to
> set HOME to a relative name. When POSIX intends the requirement that
> an environment variable's value must be absolute (e.g., PWD), it says
> so. When it doesn't intend such a requirement (e.g., HOME, PATH,
> SHELL, TMPDIR) it says nothing.
So the justification for implementing this is indeed "it's not
explicitly forbidden".
Here's an example of how this can be confusing:
cd /tmp
mkdir foo
echo hi > foo/bar
HOME=foo emacs
C-x C-f ~/bar ; works
M-: (shell-command "ls ~/bar") ; fails
So, Emacs and external processes it spawns interpret ~ differently;
ie external processes are likely to fail in odd ways. All this would be
avoided if the user had just said HOME=$PWD/foo to start with.
>> I am at this point looking for any documentation (not even from POSIX,
>> any shell or frankly any Unix utility will do) that says "HOME need
>> not be absolute, if not, here's how that is handled".
AFAICS Emacs is the only thing documenting this scenario.
- bug#33255: 27.0.50; expand-file-name: default directory expanded twice if relative, (continued)
- bug#33255: 27.0.50; expand-file-name: default directory expanded twice if relative, Glenn Morris, 2018/11/20
- bug#33255: 27.0.50; expand-file-name: default directory expanded twice if relative, Paul Eggert, 2018/11/20
- bug#33255: 27.0.50; expand-file-name: default directory expanded twice if relative, Glenn Morris, 2018/11/22
- bug#33255: 27.0.50; expand-file-name: default directory expanded twice if relative, Paul Eggert, 2018/11/23
- bug#33255: 27.0.50; expand-file-name: default directory expanded twice if relative,
Glenn Morris <=
- bug#33255: 27.0.50; expand-file-name: default directory expanded twice if relative, Paul Eggert, 2018/11/27