problem with named directories over the net

problem with named directories over the net

[Dominik Vogt]

I like to shorten my prompt by using '~' instead of the full path
to my home directory.  For example:

  / $ cd ~/bin
  ~/bin $

Now the problem occurs when I fire up mc.  Upon leaving mc, a
script from the mc documentation cds into the current path and I
get something like

  /net/server/share/home/luthien/bin $

as the prompt because this is where my home directory comes from.
/home is a symbolic link to /net/server/share/home.  Any idea how
I can prevent this?

The function I start mc with looks like this:

------------------------ snip --------------------
# midnight commander (change dir after exit)
mc ()
{
  local MC
  MC=/tmp/mc$$-"$RANDOM"
  if [ "$TERM" = xterm -o "$TERM" = rxvt ] ; then
    /usr/bin/mc -a -c -d -u -x -P "$@" > "$MC"
  else
    /usr/bin/mc -a -c -d -u -P "$@" > "$MC"
  fi
  cd `cat "$MC"`
  rm "$MC"
  unset MC;
}
------------------------ snip --------------------

Bye

Dominik ^_^  ^_^

-- 
Dominik Vogt, email: d.vogt@lifebits.de
LifeBits Aktiengesellschaft, Albrechtstr. 9, D-72072 Tuebingen
fon: ++49 (0) 7071/7965-0, fax: ++49 (0) 7071/7965-20

RE: problem with named directories over the net

[Borsenkow Andrej]

> 
> I like to shorten my prompt by using '~' instead of the full path
> to my home directory.  For example:
> 
>   / $ cd ~/bin
>   ~/bin $
> 
> Now the problem occurs when I fire up mc.  Upon leaving mc, a
> script from the mc documentation cds into the current path and I
> get something like
> 
>   /net/server/share/home/luthien/bin $
> 
> as the prompt because this is where my home directory comes from.
> /home is a symbolic link to /net/server/share/home.  Any idea how
> I can prevent this?
> 

PS1="%~ %# "

Is it what you want?

-andrej

Re: problem with named directories over the net

[Dominik Vogt]

On Fri, Jan 11, 2002 at 03:55:48PM +0300, Borsenkow Andrej wrote:
> 
> > 
> > I like to shorten my prompt by using '~' instead of the full path
> > to my home directory.  For example:
> > 
> >   / $ cd ~/bin
> >   ~/bin $
> > 
> > Now the problem occurs when I fire up mc.  Upon leaving mc, a
> > script from the mc documentation cds into the current path and I
> > get something like
> > 
> >   /net/server/share/home/luthien/bin $
> > 
> > as the prompt because this is where my home directory comes from.
> > /home is a symbolic link to /net/server/share/home.  Any idea how
> > I can prevent this?
> > 
> 
> PS1="%~ %# "
> 
> Is it what you want?

No, I already have that im my prompt.  The problem is that only
"/home/luthien" is written as "~",
not "/net/server/share/home/luthien".

Bye

Dominik ^_^  ^_^

-- 
Dominik Vogt, email: d.vogt@lifebits.de
LifeBits Aktiengesellschaft, Albrechtstr. 9, D-72072 Tuebingen
fon: ++49 (0) 7071/7965-0, fax: ++49 (0) 7071/7965-20

RE: problem with named directories over the net

[Borsenkow Andrej]

> >
> > PS1="%~ %# "
> >
> > Is it what you want?
> 
> No, I already have that im my prompt.  The problem is that only
> "/home/luthien" is written as "~",
> not "/net/server/share/home/luthien".
> 

Yes, I already realized I misunderstood the problem.

I wonder if zsh should resolve links when comparing paths. Is there
cases when somebody would like to treat link and its target differently?

-andrej

Re: problem with named directories over the net

[Dominik Vogt]

On Fri, Jan 11, 2002 at 05:35:27PM +0300, Borsenkow Andrej wrote:
> > >
> > > PS1="%~ %# "
> > >
> > > Is it what you want?
> > 
> > No, I already have that im my prompt.  The problem is that only
> > "/home/luthien" is written as "~",
> > not "/net/server/share/home/luthien".
> > 
> 
> Yes, I already realized I misunderstood the problem.
> 
> I wonder if zsh should resolve links when comparing paths. Is there
> cases when somebody would like to treat link and its target differently?

I think zsh can't even know that there is a link from /home to
/net ...  I'd have to specify a list of directories that are shown
with the same name in the prompt.

Bye

Dominik ^_^  ^_^

-- 
Dominik Vogt, email: d.vogt@lifebits.de
LifeBits Aktiengesellschaft, Albrechtstr. 9, D-72072 Tuebingen
fon: ++49 (0) 7071/7965-0, fax: ++49 (0) 7071/7965-20

Re: problem with named directories over the net

[Zefram]

Dominik Vogt wrote:
>"/home/luthien" is written as "~",
>not "/net/server/share/home/luthien".

What difference does the option CHASE_LINKS make for you?  It should
give you a consistent resolution of the directory name, which should
be helpful.

-zefram

Re: problem with named directories over the net

[Bart Schaefer]

On Jan 11,  2:41pm, Zefram wrote:
} Subject: Re: problem with named directories over the net
}
} Dominik Vogt wrote:
} >"/home/luthien" is written as "~",
} >not "/net/server/share/home/luthien".
} 
} What difference does the option CHASE_LINKS make for you?

I just tried that, and it makes neither one be written as tilde, unless
you also reassign HOME to refer to the chased path, in which case it
makes both be rewritten as tilde.

So something like

    setopt CHASE_LINKS
    cd $HOME
    export HOME=$PWD

should produce the desired effect, although CHASE_LINKS might have some
other side effects you don't like.

I seem to recall that some flavors of automounter don't work right when
you refer to a file by its real automount path and not via the automount
directory.

-- 
Bart Schaefer                                 Brass Lantern Enterprises
http://www.well.com/user/barts              http://www.brasslantern.com

Zsh: http://www.zsh.org | PHPerl Project: http://phperl.sourceforge.net   

Re: problem with named directories over the net

[Bart Schaefer]

On Jan 11,  3:28pm, Dominik Vogt wrote:
} Subject: Re: problem with named directories over the net
}
} > PS1="%~ %# "
} 
} No, I already have that im my prompt.  The problem is that only
} "/home/luthien" is written as "~",
} not "/net/server/share/home/luthien".

My "stupid zsh tricks" entry for the month:

    hash -d /=/net/server/share/home/luthien

This causes zsh to write /net/server/share/home/luthien as tilde-slash,
which is pretty nearly indistinguishable from tilde.  It means that
sub-directories of your home directory will sometimes be displayed as
~//subdir, but maybe you can live with that.

-- 
Bart Schaefer                                 Brass Lantern Enterprises
http://www.well.com/user/barts              http://www.brasslantern.com

Zsh: http://www.zsh.org | PHPerl Project: http://phperl.sourceforge.net   

Re: problem with named directories over the net

[Dominik Vogt]

On Fri, Jan 11, 2002 at 03:50:07PM +0000, Bart Schaefer wrote:
> On Jan 11,  3:28pm, Dominik Vogt wrote:
> } Subject: Re: problem with named directories over the net
> }
> } > PS1="%~ %# "
> } 
> } No, I already have that im my prompt.  The problem is that only
> } "/home/luthien" is written as "~",
> } not "/net/server/share/home/luthien".
> 
> My "stupid zsh tricks" entry for the month:
> 
>     hash -d /=/net/server/share/home/luthien
> 
> This causes zsh to write /net/server/share/home/luthien as tilde-slash,
> which is pretty nearly indistinguishable from tilde.

> It means that
> sub-directories of your home directory will sometimes be displayed as
> ~//subdir, but maybe you can live with that.

Easily.  Thanks a lot!

Bye

Dominik ^_^  ^_^

-- 
Dominik Vogt, email: d.vogt@lifebits.de
LifeBits Aktiengesellschaft, Albrechtstr. 9, D-72072 Tuebingen
fon: ++49 (0) 7071/7965-0, fax: ++49 (0) 7071/7965-20

Re: problem with named directories over the net

[Peter Stephenson]

Dominik Vogt wrote:
> I like to shorten my prompt by using '~' instead of the full path
> to my home directory.  For example:
> 
>   / $ cd ~/bin
>   ~/bin $
> 
> Now the problem occurs when I fire up mc.  Upon leaving mc, a
> script from the mc documentation cds into the current path and I
> get something like
> 
>   /net/server/share/home/luthien/bin $
> 
> as the prompt because this is where my home directory comes from.
> /home is a symbolic link to /net/server/share/home.  Any idea how
> I can prevent this?

You can generically prevent anything like this by altering HOME to the
resolved path in your .zshrc:

if [[ $PWD = $HOME(|/*) ]]; then
  newdir=${PWD##$HOME}
  HOME=$(cd $HOME && pwd -r || print $HOME)
  cd $HOME${newdir}
  unset newdir
else
  HOME=$(cd $HOME && pwd -r || print $HOME)
fi

This produces HOME=/net/server/share/home/luthien in your case.
That's a general case --- you can shorten the code if you assume a
particular form for $HOME before and after resolution.

If you want to keep inside the symbolic link, since it's mc that's
resolving the link and presenting zsh with it, and zsh can't tell if
there's a symbolic link pointing to the current directory, it looks like
you need to handle this case specially in mc somehow.  Obviously you can
replace /net/server/share/home with /home in the directory before changing
to it.

cd ${$(<"$MC")##/net/server/share}

What more are you looking for?

-- 
Peter Stephenson <pws@csr.com>                  Software Engineer
CSR Ltd., Science Park, Milton Road,
Cambridge, CB4 0WH, UK                          Tel: +44 (0)1223 392070


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Re: problem with named directories over the net

[Duncan Sinclair]

Hi,

Dominik writes:
>I like to shorten my prompt by using '~' instead of the full path
>to my home directory.  For example:

>  / $ cd ~/bin
>  ~/bin $

>Now the problem occurs when I fire up mc.  Upon leaving mc, a
>script from the mc documentation cds into the current path and I
>get something like

>  /net/server/share/home/luthien/bin $

>as the prompt because this is where my home directory comes from.
>/home is a symbolic link to /net/server/share/home.  Any idea how
>I can prevent this?


In my .zshenv I have this code....

# Going for hack of the year award...
case "$PWD" in
    /tmp_mnt/*) cd '/tmp_mnt' '' ;;
    /export/*)  cd '/export'  '' ;;
    *) ;;
  esac

It was put there to get around older Sun automounter difficulties...
(It is no-longer necessary, but it does no harm...)

If you want to be really pro-active, you could try something like
this in your precmd function...

  precmd() {
    case "$PWD" in
      /net/server/share/*) cd '/net/server/share' '' ;;
      *) ;;
    esac
  }

No idea if it works...

Good luck!



Duncan.

PS> Solutions involving CHASE_LINKS are _evil_!!!

Re: problem with named directories over the net

[Dominik Vogt]

On Mon, Jan 14, 2002 at 01:27:29PM +0000, Duncan Sinclair wrote:
> Hi,
> 
> Dominik writes:
> >I like to shorten my prompt by using '~' instead of the full path
> >to my home directory.  For example:
> 
> >  / $ cd ~/bin
> >  ~/bin $
> 
> >Now the problem occurs when I fire up mc.  Upon leaving mc, a
> >script from the mc documentation cds into the current path and I
> >get something like
> 
> >  /net/server/share/home/luthien/bin $
> 
> >as the prompt because this is where my home directory comes from.
> >/home is a symbolic link to /net/server/share/home.  Any idea how
> >I can prevent this?
> 
> 
> In my .zshenv I have this code....
> 
> # Going for hack of the year award...
> case "$PWD" in
>     /tmp_mnt/*) cd '/tmp_mnt' '' ;;
>     /export/*)  cd '/export'  '' ;;
>     *) ;;
>   esac
> 
> It was put there to get around older Sun automounter difficulties...
> (It is no-longer necessary, but it does no harm...)
> 
> If you want to be really pro-active, you could try something like
> this in your precmd function...
> 
>   precmd() {
>     case "$PWD" in
>       /net/server/share/*) cd '/net/server/share' '' ;;
>       *) ;;
>     esac
>   }

Works like a charm - with a few minor modifications.  First, you
can put that in the chpwd function to have the code executed only
when the working directory changes.  Second, the slash before the
asterisk in the case value prevents that it works on the top
directory itself since PWD does not have the trailing slash for
directories.  I now use this script:

  chpwd ()
  {
    case "$PWD" in
      /net/server/share/home*)
        cd '/net/server/share' ''
        ;;
      /net/server/share/common*)
        cd '/net/server/share' ''
        ;;
      *)
        ;;
    esac
  }

Where "common" is a named directory pointing to
/net/server/share/common and /home is a symbolic link.


Bye

Dominik ^_^  ^_^

-- 
Dominik Vogt, email: d.vogt@lifebits.de
LifeBits Aktiengesellschaft, Albrechtstr. 9, D-72072 Tuebingen
fon: ++49 (0) 7071/7965-0, fax: ++49 (0) 7071/7965-20

Re: problem with named directories over the net

[Bart Schaefer]

On Jan 14,  5:40pm, Dominik Vogt wrote:
} Subject: Re: problem with named directories over the net
}
} Works like a charm - with a few minor modifications.  First, you
} can put that in the chpwd function to have the code executed only
} when the working directory changes.

I had been about to suggest that myself, but if you ever happen to
'setopt chaselinks' you could end up with an infinite loop on your
hands, so I didn't.  Also, if it's in chpwd it won't get executed
the first time a new shell starts up, which might make a difference
in a few rare cases.

Of course you can insert a call to chpwd at the end of your .zshrc, and if
you use the zsh/parameter module you could prevent the infinite loop with:

    chpwd ()
    {
	[[ $funcstack == chpwd*chpwd* ]] && return
	# ... etc. ...
    }

} Second, the slash before the
} asterisk in the case value prevents that it works on the top
} directory itself since PWD does not have the trailing slash for
} directories.  I now use this script:
} 
}   chpwd ()
}   {
}     case "$PWD" in
}       /net/server/share/home*)
}         cd '/net/server/share' ''
}         ;;
}       /net/server/share/common*)
}         cd '/net/server/share' ''
}         ;;
}       *)
}         ;;
}     esac
}   }

Is it really the case that only `home' and `common' are automounted?
Anyway, having an empty *) fallthrough is redundant.  Why not just:

    chpwd ()
    {
	[[ $PWD == /net/server/share/* ]] && cd /net/server/share ''
    }

(plus possible loop protection per above)?

-- 
Bart Schaefer                                 Brass Lantern Enterprises
http://www.well.com/user/barts              http://www.brasslantern.com

Zsh: http://www.zsh.org | PHPerl Project: http://phperl.sourceforge.net   

Re: problem with named directories over the net

[Dominik Vogt]

On Mon, Jan 14, 2002 at 06:11:32PM +0000, Bart Schaefer wrote:
> On Jan 14,  5:40pm, Dominik Vogt wrote:
> } Subject: Re: problem with named directories over the net
> }
> } Works like a charm - with a few minor modifications.  First, you
> } can put that in the chpwd function to have the code executed only
> } when the working directory changes.
> 
> I had been about to suggest that myself, but if you ever happen to
> 'setopt chaselinks' you could end up with an infinite loop on your
> hands, so I didn't.

In fact I got that loop at some point when writing the function
and switched to precmd so that I don't have to think about it.

>  Also, if it's in chpwd it won't get executed
> the first time a new shell starts up, which might make a difference
> in a few rare cases.
>
> Of course you can insert a call to chpwd at the end of your .zshrc,

That's how I've been doing it for ages to set the xterm title.

> and if
> you use the zsh/parameter module you could prevent the infinite loop with:

Nope, I'm still using the zsh that came with SuSE 7.1 at work (3.1.9).

> 
>     chpwd ()
>     {
> 	[[ $funcstack == chpwd*chpwd* ]] && return
> 	# ... etc. ...
>     }
> 
> } Second, the slash before the
> } asterisk in the case value prevents that it works on the top
> } directory itself since PWD does not have the trailing slash for
> } directories.  I now use this script:
> } 
> }   chpwd ()
> }   {
> }     case "$PWD" in
> }       /net/server/share/home*)
> }         cd '/net/server/share' ''
> }         ;;
> }       /net/server/share/common*)
> }         cd '/net/server/share' ''
> }         ;;
> }       *)
> }         ;;
> }     esac
> }   }
> 
> Is it really the case that only `home' and `common' are automounted?
> Anyway, having an empty *) fallthrough is redundant.  Why not just:
> 
>     chpwd ()
>     {
> 	[[ $PWD == /net/server/share/* ]] && cd /net/server/share ''
>     }
> 
> (plus possible loop protection per above)?

I can't use this approach because there are some directories on
the share that are not remapped to /.  Some are mapped to named
directories that not necessarily have the same name (obviously, I
can't give the tmp directory on the share the name 'tmp').

Bye

Dominik ^_^  ^_^

-- 
Dominik Vogt, email: d.vogt@lifebits.de
LifeBits Aktiengesellschaft, Albrechtstr. 9, D-72072 Tuebingen
fon: ++49 (0) 7071/7965-0, fax: ++49 (0) 7071/7965-20

Re: problem with named directories over the net

[Bart Schaefer]

On Jan 15, 11:53am, Dominik Vogt wrote:
} Subject: Re: problem with named directories over the net
}
} > and if
} > you use the zsh/parameter module you could prevent the infinite loop with:
} 
} Nope, I'm still using the zsh that came with SuSE 7.1 at work (3.1.9).

3.1.9 has the zsh/parameter module and the funcstack parameter therein.

-- 
Bart Schaefer                                 Brass Lantern Enterprises
http://www.well.com/user/barts              http://www.brasslantern.com

Zsh: http://www.zsh.org | PHPerl Project: http://phperl.sourceforge.net