[ -w ... ] should use access(2)

[Tim Waugh]

Configuration Information [Automatically generated, do not change]:
Machine: i686
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='i686' 
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i686-pc-linux-gnu' 
-DCONF_VENDOR='pc' -DSHELL -DHAVE_CONFIG_H  -I.  -I. -I./include -I./lib 
-D_FILE_OFFSET_BITS=64 -g
uname output: Linux gene.surrey.redhat.com 2.4.22-1.2115.nptl #1 Wed Oct 29 
15:42:51 EST 2003 i686 i686 i386 GNU/Linux
Machine Type: i686-pc-linux-gnu

Bash Version: 2.05b
Patch Level: 0
Release Status: release

Description:
        Built-in test should use access(2) for -w

Repeat-By:
        touch immutable; chattr +i immutable
        [ -w immutable ] && echo writable
        /usr/bin/test -w writable && echo writable

        The [ (built-in) -w test claims the file is writable when it is
        not; the /usr/bin/test from coreutils-5.0 correctly reports that
        the file is not writable.
Fix:
        Using access(2) for this check would fix the problem, so long as
        you used the approach taken in coreutils of setting the effective
        user/group IDs before the call and restoring them afterwards.

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