bin/43404: tab completion oddities in sh

[dholland%eecs.harvard.edu@localhost]

>Number:         43404
>Category:       bin
>Synopsis:       tab completion oddities in sh
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Jun 02 05:00:00 +0000 2010
>Originator:     David A. Holland
>Release:        NetBSD 5.99.22
>Organization:
cloudberry jam
>Environment:
System: NetBSD tanaqui 5.99.22 NetBSD 5.99.22 (TANAQUI) #31: Tue Dec 8 22:53:35 
EST 2009 dholland@tanaqui:/usr/src/sys/arch/i386/compile/TANAQUI i386
Architecture: i386
Machine: i386
>Description:

On (more than one) newly installed amd64 5.0_RC2 machine, when sh is
run as root, tab completion is enabled by default, and works. When sh
is run as non-root, it is disabled by default, and if enabled with set
-o tabcomplete, does not work.

This behavior persisted after updating to 5.99.29 (20100527).

On 5.99.22 i386, as above, tab completion is disabled by default for
both root and non-root users, and in neither case does it work if
enabled with set -o tabcomplete. I also see this behavior on a
4.0_STABLE i386 machine. I don't have other interesting cases
available at the moment.

In all the above failing cases, set -o shows tabcomplete as enabled
after running set -o tabcomplete, but it nonetheless doesn't work.

>How-To-Repeat:

        sh, set -o, set -o tabcomplete. Maybe.

>Fix:

no idea what's causing this but I'm pretty sure it's not anything in
/root on the new machines.