Re: Breaking out of the emulation dir

[David Holland <dholland-tech%netbsd.org@localhost>]

On Mon, May 21, 2012 at 11:01:19PM +0200, Edgar Fu? wrote:
 > > This is not supposed to have changed recently, although I did rework
 > > the code and it's not impossible that some corner cases changed.
 > So what am I doing wrong here? Maybe it's something stupid and I just
 > don't notice:
 > 
 > $ ls -l /usr/pkg/etc/tsm/dsm.opt 
 > -rw-r--r--  1 root  wheel  70 May  9 15:22 /usr/pkg/etc/tsm/dsm.opt
 > $ /emul/linux32/bin/sh -c 'ls -l /usr/pkg/etc/tsm/dsm.opt'
 > -rw-r--r--  1 root wheel 70 May  9 15:22 /usr/pkg/etc/tsm/dsm.opt
 > $ ls -l /emul/linux32/opt/tivoli/tsm/client/ba/bin/dsm.opt
 > lrwxr-xr-x  1 root  wheel  24 May 21 22:48 
 > /emul/linux32/opt/tivoli/tsm/client/ba/bin/dsm.opt -> 
 > /usr/pkg/etc/tsm/dsm.opt
 > $ /emul/linux32/bin/sh -c 'ls -l /opt/tivoli/tsm/client/ba/bin/dsm.opt'
 > lrwxr-xr-x  1 root wheel 24 May 21 22:48 
 > /opt/tivoli/tsm/client/ba/bin/dsm.opt -> /usr/pkg/etc/tsm/dsm.opt
 > $ ls -lL /emul/linux32/opt/tivoli/tsm/client/ba/bin/dsm.opt
 > -rw-r--r--  1 root  wheel  70 May  9 15:22 
 > /emul/linux32/opt/tivoli/tsm/client/ba/bin/dsm.opt
 > $ /emul/linux32/bin/sh -c 'ls -lL /opt/tivoli/tsm/client/ba/bin/dsm.opt'
 > ls: /opt/tivoli/tsm/client/ba/bin/dsm.opt: No such file or directory
 > 
 > Everything is as expected, except for the last command. Are symlinks
 > inside the emulation tree restricted to stay inside the emulation tree?

No. The problem is that thesymlink needs to point to 
/../usr/pkg/etc/tsm/dsm.opt rather than /usr/pkg/etc/tsm/dsm.opt.

The "/../" is magic and leads to the real root. Just "/" leads to the
emulation root.

-- 
David A. Holland
dholland%netbsd.org@localhost