Package: dash
Version: 0.5.8-2.10

If /bin/sh points to dash (the default for some nine years now), dash
fails to crossgrade, say from i386 to amd64.  This is a regression from
Stretch where that worked flawlessly.

,----
| # export LC_ALL=C
| # dpkg --print-architecture
| amd64
| # dpkg --print-foreign-architectures
| i386
| # dpkg-query -W dash
| dash:i386       0.5.8-2.10
| # readlink -f /bin/sh
| /bin/dash
| # dpkg -i /var/cache/apt/archives/dash_0.5.8-2.10_amd64.deb 
| (Reading database ... 10104 files and directories currently installed.)
| Preparing to unpack .../dash_0.5.8-2.10_amd64.deb ...
| Ignoring request to remove shared diversion 'diversion of /bin/sh to 
/bin/sh.distrib by dash'.
| dpkg-divert: error: 'diversion of /bin/sh to /bin/sh.distrib by bash' clashes 
with 'diversion of /bin/sh to /bin/sh.distrib by dash'
| dash.preinst: dpkg-divert exited with status 2
| dpkg: error processing archive 
/var/cache/apt/archives/dash_0.5.8-2.10_amd64.deb (--install):
|  new dash:i386 package pre-installation script subprocess returned error exit 
status 1
| Errors were encountered while processing:
|  /var/cache/apt/archives/dash_0.5.8-2.10_amd64.deb
`----

A workaround is to dpkg-reconfigure dash to not provide /bin/sh, then
installing dash:amd64 over dash:i386 works.

,----
| # dpkg-reconfigure dash
| Removing 'diversion of /bin/sh to /bin/sh.distrib by dash'
| Adding 'diversion of /bin/sh to /bin/sh.distrib by bash'
| Removing 'diversion of /usr/share/man/man1/sh.1.gz to 
/usr/share/man/man1/sh.distrib.1.gz by dash'
| Adding 'diversion of /usr/share/man/man1/sh.1.gz to 
/usr/share/man/man1/sh.distrib.1.gz by bash'
| # readlink -f /bin/sh
| /bin/bash
| # dpkg -i /var/cache/apt/archives/dash_0.5.8-2.10_amd64.deb 
| (Reading database ... 10104 files and directories currently installed.)
| Preparing to unpack .../dash_0.5.8-2.10_amd64.deb ...
| Unpacking dash (0.5.8-2.10) over (0.5.8-2.10) ...
| Setting up dash (0.5.8-2.10) ...
`----

I haven't looked in great detail, but I suspect it is related to #890073.


-- System Information:
Debian Release: buster/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (101, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.18.4-nouveau (SMP w/2 CPU cores)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8), 
LANGUAGE=de_DE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages dash depends on:
ii  debianutils  4.8.6
ii  dpkg         1.19.0.5+b1
ii  libc6        2.27-5

dash recommends no packages.

dash suggests no packages.

-- debconf information:
* dash/sh: true

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