Bug#539425: On upgrade of existing system, dash becomes system default if debconf non-interactive

Package: dash
Version: 0.5.5.1-2.3
Severity: serious

During the upgrade of a pbuilder environment I noticed that if
DEBIAN_FRONTEND=noninteractive, and possibly also if debconf is
not available at all, dash - when not previously installed - can
not ask its question and will thus become the default system
shell, which is not what we want.

This use case should IMO be recognized in the maintainer scripts
and handled appropriately so that the default system shell
remains unchanged for *all* existing systems.

-- System Information:
Debian Release: squeeze/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.31-rc4-agp-pat (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages dash depends on:
ii  debianutils                   3.2        Miscellaneous utilities specific t
ii  dpkg                          1.15.3.1   Debian package management system
ii  libc6                         2.9-23     GNU C Library: Shared libraries

dash recommends no packages.

dash suggests no packages.

-- debconf information excluded



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