#!/bin/bash
set -e

# shellcheck source=/dev/null
. /usr/share/debconf/confmodule

if [ -n "$DEBIAN_SCRIPT_DEBUG" ]
then
  set -v -x
  DEBIAN_SCRIPT_TRACE=1
fi

${DEBIAN_SCRIPT_TRACE:+ echo "#42#DEBUG# RUNNING $0 $*" 1>&2 }

mariadb_datadir=/var/lib/mariadb
legacy_mariadb_datadir=/var/lib/mysql

# Check if the version file mariadb_upgrade_info or mysql_upgrade_info is
# included with the provided data directory. If it is a MariaDB version, then
# return the major version number only (XX.XX). Return empty if this directory
# does not belong to MariaDB.
get_mariadb_upgrade_info_major_version() {
  datadir="$1"

  # Check both mariadb_upgrade_info (higher priority) and mysql_upgrade_info.
  if [ -f "$datadir/mysql_upgrade_info" ]
  then
    read -r full_version < "$datadir/mysql_upgrade_info"
  fi

  if [ -f "$datadir/mariadb_upgrade_info" ]
  then
    read -r full_version < "$datadir/mariadb_upgrade_info"
  fi

  # If version is not empty and contains 'MariaDB', get the version number.
  if [ -n "$full_version" ] && echo "$full_version" | grep -q "MariaDB"
  then
    # The major version number should the first two components of the version
    # string (e.g. 11.8 from 11.8.6).
    echo "$full_version" | awk -F'.' '{print $1"."$2}'
  fi
}

#
# - Purge logs and data only if they are ours (#307473)
# - Remove the mysql user only after all his owned files are purged.
# - Cleanup the initscripts only if this was the last provider of them
#
if [ "$1" = "purge" ]
then
  rm -f /etc/mysql/mariadb.conf.d/99-legacy-datadir.cnf

  # Mark data directories for removal if they match the current MariaDB version.
  remove_mariadb_datadir="false"
  remove_legacy_mariadb_datadir="false"

  mariadb_datadir_version=$(get_mariadb_upgrade_info_major_version "$mariadb_datadir")

  if [ "$mariadb_datadir_version" = "11.8" ]
  then
    remove_mariadb_datadir="true"
  fi

  legacy_mariadb_datadir_version=$(get_mariadb_upgrade_info_major_version "$legacy_mariadb_datadir")

  if [ "$legacy_mariadb_datadir_version" = "11.8" ]
  then
    remove_legacy_mariadb_datadir="true"
  fi

  # Remove logs in /var/log/mysql only if they are ours.
  # These must be removed before mysql user is removed.
  if [ "$remove_mariadb_datadir" = "true" ] || [ "$remove_legacy_mariadb_datadir" = "true" ]
  then
    rm -f /var/log/mysql.{log,err}{,.0,.[1234567].gz}
    rm -rf /var/log/mysql
  fi

  db_input high "mariadb-server/postrm_remove_databases" || true
  db_go || true
  db_get "mariadb-server/postrm_remove_databases" || true
  if [ "$RET" = "true" ]
  then
    # never remove the debian.cnf when the databases are still existing
    # else we ran into big trouble on the next install!
    if [ "$remove_mariadb_datadir" = "true" ] || [ "$remove_legacy_mariadb_datadir" = "true" ]
    then
      rm -f /etc/mysql/debian.cnf
    fi
    # Remove all contents from /var/lib/mariadb except if it's a
    # directory with file system data. See #829491 for details and
    # #608938 for potential mysql-server leftovers which erroneously
    # had been renamed.
    # Attempt removal only if the directory hasn't already been removed
    # by dpkg to avoid failing on "No such file or directory" errors.
    if [ "$remove_mariadb_datadir" = "true" ]
    then
      find "$mariadb_datadir" -mindepth 1 \
        -not -path '*/lost+found/*'     -not -name 'lost+found' \
        -not -path '*/lost@002bfound/*' -not -name 'lost@002bfound' \
        -delete

      # "|| true" still needed as rmdir still exits with non-zero if
      # /var/lib/mariadb is a mount point
      rmdir --ignore-fail-on-non-empty "$mariadb_datadir" || true
    fi
    # Remove all contents from /var/lib/mysql if it's owned by us, with same
    # checks as /var/lib/mariadb.
    if [ "$remove_legacy_mariadb_datadir" = "true" ]
    then
      find "$legacy_mariadb_datadir" -mindepth 1 \
        -not -path '*/lost+found/*'     -not -name 'lost+found' \
        -not -path '*/lost@002bfound/*' -not -name 'lost@002bfound' \
        -delete

      # "|| true" still needed as rmdir still exits with non-zero if
      # /var/lib/mysql is a mount point
      rmdir --ignore-fail-on-non-empty "$legacy_mariadb_datadir" || true
    fi

    # Remove /run/mysqld and mysql user if owned by us.
    if [ "$remove_mariadb_datadir" = "true" ] || [ "$remove_legacy_mariadb_datadir" = "true" ]
    then
      rm -rf /run/mysqld # this directory is created by the init script, don't leave behind
      userdel mysql || true
    fi
  fi

fi

# Automatically added by dh_installinit/13.31
if [ "$1" = "remove" ] && [ -x "/etc/init.d/mariadb" ] ; then
	chmod -x "/etc/init.d/mariadb" >/dev/null || true
fi
if [ -z "$DPKG_ROOT" ] && [ "$1" = "purge" ] ; then
	update-rc.d mariadb remove >/dev/null
fi
# End automatically added section
# Automatically added by dh_installsystemd/13.31
if [ "$1" = remove ] && [ -d /run/systemd/system ] ; then
	systemctl --system daemon-reload >/dev/null || true
fi
# End automatically added section
# Automatically added by dh_installsystemd/13.31
if [ "$1" = "purge" ]; then
	if [ -x "/usr/bin/deb-systemd-helper" ]; then
		deb-systemd-helper purge 'mariadb.service' >/dev/null || true
	fi
fi
# End automatically added section
# Automatically added by dh_installdebconf/13.31
if [ "$1" = purge ] && [ -e /usr/share/debconf/confmodule ]; then
	. /usr/share/debconf/confmodule
	db_purge
fi
# End automatically added section
# Automatically added by dh_apparmor/4.1.7-1
if [ "$1" = "purge" ] && ! [ -e "/etc/apparmor.d/mariadbd" ] ; then
    rm -f "/etc/apparmor.d/disable/mariadbd" || true
    rm -f "/etc/apparmor.d/force-complain/mariadbd" || true
    rm -f "/etc/apparmor.d/local/mariadbd" || true
    rm -f /var/cache/apparmor/*/"mariadbd" || true
    rmdir /etc/apparmor.d/disable 2>/dev/null || true
    rmdir /etc/apparmor.d/local   2>/dev/null || true
    rmdir /etc/apparmor.d         2>/dev/null || true
fi
# End automatically added section