[Pkg-pdns-maintainers] Bug#793593: pdns-backend-mysql: fails to remove if mysql-client is not (no longer) installed

[Andreas Beckmann]

Package: pdns-backend-mysql
Version: 3.4.5-1
Severity: serious
User: debian-qa at lists.debian.org
Usertags: piuparts

Hi,

during a test with piuparts I noticed your package fails to remove.

I took special care s.t. a local mysql server was running for the
installation of the package, but apt chose an unfortunate (but
completely valid) order to remove the packages: it removed
mysql-server+mysql-client before pdns-backend-mysql.
Either pdns-backend-mysql needs to depend on mysql-client or it must not
fail on removal (and accept that it cannot perform some cleanup
operations).

>From the attached log (scroll to the bottom...):

1m46.7s DEBUG: Starting command: ['chroot', '/tmp/piupartss/tmpLM4McT', 'apt-get', 'remove', 'mysql-client-core-5.6', 'mysql-server-5.6', 'libdbi-perl', 'mysql-common', 'libgdbm3:amd64', 'libsqlite3-0:amd64', 'libgmp10:amd64', 'perl-modules', 'libboost-serialization1.55.0:amd64', 'libssl1.0.0:amd64', 'mysql-server', 'perl', 'pdns-server', 'libterm-readkey-perl', 'libbsd0:amd64', 'liblua5.1-0:amd64', 'mysql-client-5.6', 'libboost-program-options1.55.0:amd64', 'libmysqlclient18:amd64', 'mysql-server-core-5.6', 'libwrap0:amd64', 'libaio1:amd64', 'libdbd-mysql-perl', 'libedit2:amd64', 'libbotan-1.10-0', 'libpolarssl7', 'psmisc', 'libcrypto++9', 'pdns-backend-mysql']
1m50.4s DUMP: 
  Reading package lists...
  Building dependency tree...
  Reading state information...
  The following packages will be REMOVED:
    libaio1 libboost-program-options1.55.0 libboost-serialization1.55.0
    libbotan-1.10-0 libbsd0 libcrypto++9 libdbd-mysql-perl libdbi-perl libedit2
    libgdbm3 libgmp10 liblua5.1-0 libmysqlclient18 libpolarssl7 libsqlite3-0
    libssl1.0.0 libterm-readkey-perl libwrap0 mysql-client-5.6
    mysql-client-core-5.6 mysql-common mysql-server mysql-server-5.6
    mysql-server-core-5.6 pdns-backend-mysql pdns-server perl perl-modules
    psmisc
  0 upgraded, 0 newly installed, 29 to remove and 0 not upgraded.
  After this operation, 211 MB disk space will be freed.
  (Reading database ... 
(Reading database ... 9645 files and directories currently installed.)
  Removing mysql-server (5.6.25-3) ...
  Removing mysql-server-5.6 (5.6.25-3) ...
  Stopping MySQL database server: mysqld.
  update-alternatives: using /etc/mysql/my.cnf.fallback to provide /etc/mysql/my.cnf (my.cnf) in auto mode
  Removing mysql-server-core-5.6 (5.6.25-3) ...
  Removing mysql-client-5.6 (5.6.25-3) ...
  Removing mysql-client-core-5.6 (5.6.25-3) ...
  Removing libaio1:amd64 (0.3.110-1) ...
  Removing pdns-backend-mysql (3.4.5-1) ...
  dbconfig-common: dumping mysql database pdnsbackendmysql to /var/tmp/pdns-backend-mysql.pdnsbackendmysql.2015-07-24-15.13.mysql.CZHFmT.
  sanity check failed for mysql.
  error encountered dumping database:
  No mysql client to execute. (have you installed the mysql-client package?)
  dbconfig-common: pdns-backend-mysql remove: aborted.
  dbconfig-common: flushing administrative password
  dpkg: error processing package pdns-backend-mysql (--remove):
   subprocess installed pre-removal script returned error exit status 1
  dbconfig-common: flushing administrative password
  Removing libedit2:amd64 (3.1-20150325-1) ...
[...]

cheers,

Andreas
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