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编辑当前文件:/var/lib/dpkg/info/mysql-common.preinst

#!/bin/sh
set -e

if [ "$1" = "install" ] || [ "$1" = "upgrade" ]; then
    if dpkg --compare-versions "$2" lt-nl "5.6.25-3~" ; then

# revert fallback my.cnf symlink setup performed by mariadb-common
        # from 10.0.17-1~exp2 upto 10.0.20-2
        if [ -L /etc/mysql/my.cnf ] && [ -f /etc/mysql/my.cnf.old ]; then
            if [ "$(readlink /etc/mysql/my.cnf)" = "mariadb.cnf" ]; then
                echo "Reverting my.cnf -> mariadb.cnf symlink setup by mariadb-common"
                rm /etc/mysql/my.cnf
                mv /etc/mysql/my.cnf.old /etc/mysql/my.cnf
            fi
        fi

# recover from mysql-common 5.6.25-2 turning this symlinked
        # mariadb.cnf into my.cnf.migrated
        if [ -f /etc/mysql/my.cnf.migrated ]; then
            if [ "$(md5sum /etc/mysql/my.cnf.migrated | awk '{ print $1 }')" = "4720bbc1a03252fbb9eb83b55f0b6e10" ]; then
                # unmodified mariadb.cnf with the migration header prepended
                # by mysql-common.postinst
                echo "Removing incorrect /etc/mysql/my.cnf.migrated that was actually mariadb.cnf"
                rm /etc/mysql/my.cnf.migrated
                if [ -f /etc/mysql/my.cnf.old ]; then
                    echo "Renaming (possibly unmodified) /etc/mysql/my.cnf.old to /etc/mysql/my.cnf.migrated"
                    mv /etc/mysql/my.cnf.old /etc/mysql/my.cnf.migrated
                else
                    update-alternatives --remove my.cnf /etc/mysql/my.cnf.migrated
                fi
            fi
        fi

fi
fi

# Automatically added by dh_installdeb/13.5.2ubuntu1
dpkg-maintscript-helper rm_conffile /etc/mysql/conf.d/.keepme 5.6.22-1\~ mysql-common -- "$@"
dpkg-maintscript-helper rm_conffile /etc/mysql/my.cnf 5.6.22-1\~ mysql-common -- "$@"
# End automatically added section