Doubt with apt and dist-upgrade (mariadb involved)

[circus78]

Hi,
I am using Debian 7

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# lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description:    Debian GNU/Linux 7.11 (wheezy)
Release:        7.11
Codename:       wheezy

apt needs to upgrade some packages:

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# apt-get upgrade -s
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages have been kept back:
  libmysqlclient18 python-reportbug reportbug
0 upgraded, 0 newly installed, 0 to remove and 3 not upgraded.

Anyway, if I try apt-get dist-upgrade, I notice this:

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# apt-get dist-upgrade -s
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Done
The following packages will be REMOVED:
  libmariadbclient18 mariadb-client-5.5 mariadb-client-core-5.5 mariadb-galera-server mariadb-galera-server-5.5
The following NEW packages will be installed:
  libevent-2.0-5 libgmp10 python-crypto python-gevent python-greenlet python-oauthlib python-requests python-six
The following packages will be upgraded:
  libmysqlclient18 python-reportbug reportbug
3 upgraded, 8 newly installed, 5 to remove and 0 not upgraded.
Remv mariadb-galera-server [5.5.47+maria-1~wheezy]
Remv mariadb-galera-server-5.5 [5.5.47+maria-1~wheezy]
Remv mariadb-client-5.5 [5.5.47+maria-1~wheezy]
Remv mariadb-client-core-5.5 [5.5.47+maria-1~wheezy]
Remv libmariadbclient18 [5.5.47+maria-1~wheezy] [libmysqlclient18:amd64 ]
Inst libmysqlclient18 [5.5.47+maria-1~wheezy] (5.5.58-0+deb7u1 Debian-Security:7.0/oldoldstable [amd64])
Inst libevent-2.0-5 (2.0.19-stable-3+deb7u2 Debian-Security:7.0/oldoldstable [amd64])
Inst libgmp10 (2:5.0.5+dfsg-2 Debian:7.11/oldoldstable [amd64])
Inst python-six (1.1.0-2 Debian:7.11/oldoldstable [all])
Inst python-requests (0.12.1-1+deb7u1 Debian:7.11/oldoldstable, Debian-Security:7.0/oldoldstable [all])
Inst reportbug [6.4.4+deb7u1] (6.4.4+deb7u2 Debian-Security:7.0/oldoldstable [all]) []
Inst python-reportbug [6.4.4+deb7u1] (6.4.4+deb7u2 Debian-Security:7.0/oldoldstable [all])
Inst python-crypto (2.6-4+deb7u7 Debian-Security:7.0/oldoldstable [amd64])
Inst python-oauthlib (0.1.2-1 Debian:7.11/oldoldstable [all])
Inst python-greenlet (0.3.1-2.5 Debian:7.11/oldoldstable [amd64])
Inst python-gevent (0.13.6-1+nmu3 Debian:7.11/oldoldstable [amd64])
Conf libmysqlclient18 (5.5.58-0+deb7u1 Debian-Security:7.0/oldoldstable [amd64])
Conf libevent-2.0-5 (2.0.19-stable-3+deb7u2 Debian-Security:7.0/oldoldstable [amd64])
Conf libgmp10 (2:5.0.5+dfsg-2 Debian:7.11/oldoldstable [amd64])
Conf python-six (1.1.0-2 Debian:7.11/oldoldstable [all])
Conf python-requests (0.12.1-1+deb7u1 Debian:7.11/oldoldstable, Debian-Security:7.0/oldoldstable [all])
Conf python-reportbug (6.4.4+deb7u2 Debian-Security:7.0/oldoldstable [all])
Conf reportbug (6.4.4+deb7u2 Debian-Security:7.0/oldoldstable [all])
Conf python-crypto (2.6-4+deb7u7 Debian-Security:7.0/oldoldstable [amd64])
Conf python-oauthlib (0.1.2-1 Debian:7.11/oldoldstable [all])
Conf python-greenlet (0.3.1-2.5 Debian:7.11/oldoldstable [amd64])
Conf python-gevent (0.13.6-1+nmu3 Debian:7.11/oldoldstable [amd64])

Is there a way to avoid mariadb uninstall, but let python* updates normally?

Here my repos:

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# grep -v ^$ sources.list |grep -v ^#
deb http://debian.fastweb.it/debian/ wheezy main
deb http://security.debian.org/ wheezy/updates main
deb http://debian.fastweb.it/debian/ wheezy-updates main
deb http://mirror.one.com/debian/ wheezy main
deb http://repo.percona.com/apt wheezy main

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# cat sources.list.d/backports.list 
#deb http://cdn.debian.net/debian wheezy-backports main
deb http://debian.fastweb.it/debian wheezy-backports main

And my preferences:

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# cat 00percona.pref 
Package: *
Pin: origin repo.percona.com
Pin-Priority: 1

Thank you very much

[llivv]

It depends
an easy way? not that I can see.
You have a couple of choices but non of them I know of include using dist-upgrade ....

I'd recommend ( unless you have a specific reason not to do this )
1:BACKUP BACKUP BACKUP
2: TEST the RESTORE FROM Backup to make sure the BACKUP works
3: Get the list of packages that dist-upgrade wants to update install and remove
4: Run apt-get update $PackageName # for each package on the list -- pay close attention to which packages actually uninstalls the packages you want to keep.
4.1: than choose how you want to deal with the upgrade of that package that removed the package you want.


personally: I use aptitude and dpkg almost exclusively.
I know dist-upgrade is almost flawless in most cases
but I have a lot of systems to watch and like to be able to workaround issues similar to the one you mention above in realtime
without always having to follow the dependency chains.