[Pkg-emacsen-addons] Bug#850630: elpa-company: Fails to upgrade from 0.8.12-4 when xemacs21 installed

[Sean Whitton]

Package: elpa-company
Version: 0.8.12-5
Severity: important
Tags: patch

Dear maintainer,

If xemacs21 is installed, apt cannot upgrade from elpa-company 0.8.12-4
to 0.8.12-5.

Steps to reproduce in a minimal sid chroot:

    apt-get install xemacs21
    apt-get install elpa-company=0.8.12-4
    apt-get install elpa-company=0.8.12-5

Sample output:

    Preparing to unpack .../elpa-company_0.8.12-5_all.deb ...
    Remove elpa-company for xemacs21
    remove/company-0.8.12: Skipping unsupported emacs
    dh-elpa: purging flavor specific files for xemacs21
    find: '/usr/share/xemacs21/site-lisp/elpa/company-0.8.12': No such file or directory
    ERROR: remove script from elpa-company package failed
    dpkg: warning: subprocess old pre-removal script returned error exit status 1
    dpkg: trying script from the new package instead ...
    Remove elpa-company for xemacs21
    remove/company-0.8.12: Skipping unsupported emacs
    dh-elpa: purging flavor specific files for xemacs21
    find: '/usr/share/xemacs21/site-lisp/elpa/company-0.8.12': No such file or directory
    ERROR: remove script from elpa-company package failed
    dpkg: error processing archive /var/cache/apt/archives/elpa-company_0.8.12-5_all.deb (--unpack):
     subprocess new pre-removal script returned error exit status 1

The attached patch fixes the problem (also available as a branch
'upgrade-fix' in the team git repository).  Please consider uploading it
before 0.8.12-5 migrates to stretch.

Thanks to 'cruncher' on #debian-next for help with this fix.

-- System Information:
Debian Release: stretch/sid
  APT prefers testing
  APT policy: (900, 'testing')
Architecture: i386 (i686)

Kernel: Linux 4.8.0-1-686-pae (SMP w/2 CPU cores)
Locale: LANG=en_GB.utf8, LC_CTYPE=en_GB.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages elpa-company depends on:
ii  emacs              46.1
ii  emacs24 [emacsen]  24.5+1-7.1
ii  emacs25 [emacsen]  25.1+1-3
ii  emacsen-common     2.0.8

elpa-company recommends no packages.

elpa-company suggests no packages.

-- no debconf information

-- 
Sean Whitton
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