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symbolic links & `..' entry
From: |
Ivan Shmakov |
Subject: |
symbolic links & `..' entry |
Date: |
09 Feb 2007 01:32:11 +0600 |
User-agent: |
Gnus/5.09 (Gnus v5.9.0) Emacs/21.2 |
>>>>> "PT" == Pierre THIERRY <nowhere.man@levallois.eu.org> writes:
IS> Yes, shells oftenly do that. Note, however, that almost every
IS> other program isn't so smart:
>> $ mkdir -p a/b c/d
>> $ cd c/d
>> c/d $ ln -s ../../a/b e
>> c/d $ cd e
>> c/d/e $ ls ../
>> b
>> c/d/e $
IS> Would `ls' parse `..' by itself, `e' would have been shown instead.
IS> And again, I'm not about to /deny/ such ``lexical'' interpretation
IS> of `..', but it's not clear to me, which benefits it would bring
IS> (or, which things it would break?)
PT> The benefit seems obvious to me from your example: it would make
PT> symlinks a less leaky abstraction. And I'm curious where the
PT> current behaviour ls exhibits here is needed.
... Yet another example:
$ mkdir -p a/b a/x c/d
$ touch a/x/y
$ cd a/b
a/b $ ln -s ../x z
a/b $ cd ../..
$ ls a/x/
y
$ ls a/b/z/
y
$
Now, let us repeat the steps from the previous example:
$ cd c/d
c/d $ ln -s ../../a/b e
c/d $ cd e
c/d/e $
Now, $ ls z/ will show us `y', just as expected. Would `..' be
interpreted lexically, it would break the things, since
`c/d/e/z', being a symbolic link to `../x', would lead us to
non-existent `c/d/x'.
I guess, there could be some examples related to the use of GNU
Arch, since it depends on ascending directory tree recursively
to get access to its control files, `{arch}/'.
... Doesn't it look like both interpretations could be useful?
- Re: Hurd and Unix/Linux and Plan9 features, (continued)
- Re: Hurd and Unix/Linux and Plan9 features, Ivan Shmakov, 2007/02/03
- Re: Hurd and Unix/Linux and Plan9 features, Shams, 2007/02/03
- Re: Hurd and Unix/Linux and Plan9 features, olafBuddenhagen, 2007/02/03
- Re: Hurd and Unix/Linux and Plan9 features, Ivan Shmakov, 2007/02/04
- Re: Hurd and Unix/Linux and Plan9 features, Shams, 2007/02/04
- Re: Hurd and Unix/Linux and Plan9 features, Pierre THIERRY, 2007/02/06
- Re: Hurd and Unix/Linux and Plan9 features, Ivan Shmakov, 2007/02/07
- Re: Hurd and Unix/Linux and Plan9 features, Pierre THIERRY, 2007/02/07
- symbolic links & `..' entry,
Ivan Shmakov <=
- Re: symbolic links & `..' entry, Pierre THIERRY, 2007/02/08
- Re: symbolic links & `..' entry, Ivan Shmakov, 2007/02/10
- Re: symbolic links & `..' entry, Thomas Bushnell BSG, 2007/02/10
- Re: symbolic links & `..' entry, Pierre THIERRY, 2007/02/11
Re: Hurd and Unix/Linux and Plan9 features, Pierre THIERRY, 2007/02/03
Re: Hurd and Unix/Linux and Plan9 features, olafBuddenhagen, 2007/02/03