"cd .." when WD unlinked gives wrong behaviour

[Tim Waugh]

Configuration Information [Automatically generated, do not change]:
Machine: i386
OS: linux-gnu
Compiler: i386-redhat-linux-gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='i386' 
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i386-redhat-linux-gnu' 
-DCONF_VENDOR='redhat' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL 
-DHAVE_CONFIG_H  -I.  -I. -I./include -I./lib  -D_GNU_SOURCE 
-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -O2 -g -pipe -Wp,-D_FORTIFY_SOURCE=2 
-m32 -march=i386 -mtune=pentium4
uname output: Linux gene.surrey.redhat.com 2.6.9-1.667 #1 Tue Nov 2 14:41:25 
EST 2004 i686 i686 i386 GNU/Linux
Machine Type: i386-redhat-linux-gnu

Bash Version: 3.0
Patch Level: 16
Release Status: release

Description:
        https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=149079

        When the working directory has been unlinked, "cd .." should
        give an error exit status, but instead exits with code 0.
        Additionally, "pwd" (the built-in) appends "/.." to the
        previous working directory, rather than giving an error as it
        previously did.

Repeat-By:
        $ mkdir -p /tmp/foo/bar
        $ cd /tmp/foo/bar
        $ rm -rf /tmp/foo
        $ cd ..
        cd: error retrieving current directory: getcwd: cannot access
        parent directories: No such file or directory
        $ echo $?
        0
        $ pwd
        /tmp/foo/bar/..
        $ echo $?
        0
        $ pwd -P
        pwd: error retrieving current directory: getcwd: cannot access
        parent directories: No such file or directory
        $ pwd
        pwd: error retrieving current directory: getcwd: cannot access
        parent directories: No such file or directory

Tim.
*/

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