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Subject: |
Incorrect path canonicalisation |
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Date: |
Sat, 1 Dec 2018 21:04:50 +0100 |
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User-agent: |
Claws Mail |
Emacs 26.1 removes ..'s incorrectly from file names.
Emacs removes the directory in front the .. rather than
getting its parent directory.
Example:
cd
mkdir -p 1/2
cd 1/2
echo 3 > ../../3
ln -s ~ 4
echo 5 > 5
emacs 4/../5 # works, but shouldn't
emacs 4/../$USER/3 # does not works, should
On Linux, the proper way to get the canonical path
for a file with the file descriptor $fd:
stat(3) /dev/fd/$fd
p := readlink(3) /dev/fd/$fd
if (st_nlinks != 0) {
stat(3) /dev/fd/$fd
if (st_nlinks == 0) {
p := readlink(3) /dev/fd/$fd
remove " (deleted)" from the end of p
}
} else {
remove " (deleted)" from the end of p
}
canonical path is p
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--- Begin Message ---
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Subject: |
Re: bug#33564: Incorrect path canonicalisation |
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Date: |
Wed, 21 Aug 2019 04:26:51 +0200 |
Eli Zaretskii <address@hidden> writes:
> tags 33564 notabug
> thanks
>
>> Date: Sat, 1 Dec 2018 21:04:50 +0100
>> From: Mattias Andrée <address@hidden>
>>
>> cd
>> mkdir -p 1/2
>> cd 1/2
>> echo 3 > ../../3
>> ln -s ~ 4
>> echo 5 > 5
>> emacs 4/../5 # works, but shouldn't
>> emacs 4/../$USER/3 # does not works, should
>
> This is by design: expand-file-name doesn't follow symlinks. It's
> documented not to do that: see the doc string and the ELisp manual.
>
>> On Linux, the proper way to get the canonical path
>> for a file with the file descriptor $fd:
>
> expand-file-name doesn't aim at yielding the canonical file name in
> that sense.
This was tagged notabug in December 2018; I'm now also closing this bug report.
Thanks,
Stefan Kangas
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