Inconsistent behaviour of cd and AUTO_CD

Inconsistent behaviour of cd and AUTO_CD

[Vincent Lefevre]

With zsh 4.0.4 and AUTO_CD, under Linux and ext3 filesystem type:

ay:~> mkdir blah
ay:~> cd blah
ay:~/blah> ..
ay:~> cd blah
ay:~/blah> rmdir ../blah
ay:~/blah> ..
zsh: permission denied: ..
zsh: exit 1     ..
ay:~/blah[Failed 1]> cd ..
ay:~>

The problem is that after the rmdir, "ls -a" no longer lists . and ..
(though doing something like "cat > .." gives the following error:
"zsh: is a directory: .."). When using ".." only, the directory can't
be found, but when using "cd ..", zsh assumes that the directory ..
still exists.

-- 
Vincent Lefèvre <vincent@vinc17.org> - Web: <http://www.vinc17.org/> - 100%
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Work: CR INRIA - computer arithmetic / SPACES project at LORIA

Re: Inconsistent behaviour of cd and AUTO_CD

[Oliver Kiddle]

Vincent Lefevre wrote:

> With zsh 4.0.4 and AUTO_CD, under Linux and ext3 filesystem type:
> 
> ay:~> mkdir blah
> ay:~> cd blah
> ay:~/blah> ..
> ay:~> cd blah
> ay:~/blah> rmdir ../blah
> ay:~/blah> ..
> zsh: permission denied: ..
> zsh: exit 1     ..
> ay:~/blah[Failed 1]> cd ..
> ay:~>

Yes, clearly this is inconsistent. If you set either of the chase_links
or chase_dots options, the .. implicit cd will work like the explicit
one. Note that I don't think the filesystem type, operating system or
zsh version makes any difference to this (except IRIX doesn't let me
remove the directory). In fact, even tcsh has this exact same
inconsistency.

The problem is in the cancd2() function in exec.c. It only tries an
implicit cd after establishing that the target is an accessible
directory. With chase_dots, it first resolves the target to $PWD:h so
it works. And for the cd command it doesn't have to decide what it is
doing so it just does the cd.

So cancd2() somehow needs to do a better job of resolving what the
target directory is before determining if it is accessible. I don't
fully understand the semantics of no_chase_dots to know how it should
do this. Any ideas?

Oliver

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