#!/bin/bash
#
# This file is included by /etc/mysql/debian-start
#

## Check all unclosed tables.
# - Requires the server to be up.
# - Is supposed to run silently in background.
function check_for_crashed_tables() {
set -e
set -u

# But do it in the background to not stall the boot process.
logger -p daemon.info -i -t$0 "Triggering myisam-recover for all MyISAM tables"

# Checking for $? is unreliable so the size of the output is checked.
# Some table handlers like HEAP do not support CHECK TABLE.
tempfile=`tempfile`
# We have to use xargs in this case, because a for loop barfs on the
# spaces in the thing to be looped over.
LC_ALL=C $MYSQL --skip-column-names --batch -e '
select concat('\''select count(*) into @discard from `'\'',
TABLE_SCHEMA, '\''`.`'\'', TABLE_NAME, '\''`'\'')
from information_schema.TABLES where ENGINE='\''MyISAM'\' | \
xargs -i $MYSQL --skip-column-names --silent --batch \
--force -e "{}" >$tempfile
if [ -s $tempfile ]; then
(
/bin/echo -e "\n" \
"Improperly closed tables are also reported if clients are accessing\n" \
"the tables *now*. A list of current connections is below.\n";
$MYADMIN processlist status
) >> $tempfile
# Check for presence as a dependency on mailx would require an MTA.
if [ -x /usr/bin/mailx ]; then
mailx -e -s"$MYCHECK_SUBJECT" $MYCHECK_RCPT < $tempfile
fi
(echo "$MYCHECK_SUBJECT"; cat $tempfile) | logger -p daemon.warn -i -t$0
fi
rm $tempfile
}

## Check for tables needing an upgrade.
# - Requires the server to be up.
# - Is supposed to run silently in background.
function upgrade_system_tables_if_necessary() {
set -e
set -u

logger -p daemon.info -i -t$0 "Upgrading MySQL tables if necessary."

# Filter all "duplicate column", "duplicate key" and "unknown column"
# errors as the script is designed to be idempotent.
LC_ALL=C $MYUPGRADE \
2>&1 \
| egrep -v '^(1|@had|ERROR (1054|1060|1061))' \
| logger -p daemon.warn -i -t$0
}

## Check for the presence of both, root accounts with and without password.
# This might have been caused by a bug related to mysql_install_db (#418672).
function check_root_accounts() {
set -e
set -u

logger -p daemon.info -i -t$0 "Checking for insecure root accounts."

ret=$( echo "SELECT count(*) FROM mysql.user WHERE user='root' and password='';" | $MYSQL --skip-column-names )
if [ "$ret" -ne "0" ]; then
logger -p daemon.warn -i -t$0 "WARNING: mysql.user contains $ret root accounts without password!"
fi
}