galera-4 a Recommends instead of Depends in Debian packaging

Currently MariaDB has hard dependency of galera-4 which should not be like that. Galera should be in recommends but then there is several scripts:

PR #1829 suggests to start recommend galera-4 and also tools that are assioisated with Galera scripts like:

• gawk
• iproute2
• libdbi-perl
• rsync
• socat
• lsof

Several of these tools are used in tree and required by other tools to work:

lsof command

package mariadb-server

• debian/mariadb-server.postinst
• scripts/wsrep_sst_common.sh
• scripts/wsrep_sst_backup.sh
• scripts/wsrep_sst_rsync.sh

package mariadb-test

• mysql-test/suite/galera_3nodes/suite.pm
• mysql-test/suite/galera/suite.pm
• mysql-test/suite/innodb/t/alter_inplace_perfschema.test

package not-installed

• support-files/policy/apparmor/usr.sbin.mysqld

awk command

package mariadb-server

• scripts/wsrep_sst_mysqldump.sh
• debian/mariadb-server.mariadb.init
• debian/mariadb-server.preinst
• debian/autobake-deb.sh
• support-files/mini-benchmark

package mariadb-server-core

• scripts/mysql_install_db.sh

package not-installed

• scripts/mysql_config
• support-files/policy/apparmor/usr.sbin.mysqld

Not installed at all

• scripts/sys_schema/generate_sql_file.sh

rsync command

package mariadb-server

• scripts/wsrep_sst_rsync.sh
• sql/wsrep_sst.h
• sql/wsrep_mysqld.cc

package mariadb-backup

• extra/mariabackup/innobackupex.cc
• extra/mariabackup/backup_copy.cc
• extra/mariabackup/xtrabackup.cc
• extra/mariabackup/xtrabackup.h

package mariadb-test

• mysql-test/suite/galera/*
• mysql-test/suite/sys_vars/*
• mysql-test/suite/wsrep/common.pm

package not-installed

• support-files/policy/apparmor/usr.sbin.mysqld
• support-files/policy/selinux/mariadb-server.te
• support-files/wsrep.cnf.sh

socat command

package mariadb-test

• mysql-test/include/have_mariabackup.inc
• scripts/wsrep_sst_mariabackup.sh

package mariadb-server

• mysql-test/suite/wsrep/common.pm
• mysql-test/suite/galera/*

package not-installed

• support-files/policy/apparmor/usr.sbin.mysqld

iproute2 commands

package mariadb-server

• scripts/wsrep_sst_common.sh

Every recommend should be tested as removing Galera would make wsrep_sst_* scripts non-functional without adding that package in Debian or any other distro.

Debian bug for this is: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=988089