#!/bin/bash

# This function returns all config files that daemon uses and their path
# includes /opt. It is used to get correct path to the config file.
mysql_get_config_files_scl() {
    scl enable ${ENABLED_COLLECTIONS} -- my_print_defaults --help --verbose | \
        grep --after=1 '^Default options' | \
        tail -n 1 | \
        grep -o '[^ ]*opt[^ ]*my.cnf'
}

# This function picks the main config file that deamon uses and we ship in rpm
mysql_get_correct_config() {
    # we use the same config in non-SCL packages, not necessary to guess
    [ -z "${ENABLED_COLLECTIONS}" ] && echo -n "/etc/my.cnf" && return

    # from all config files read by daemon, pick the first that exists
    for f in `mysql_get_config_files_scl` ; do
        [ -f "$f" ] && echo "$f"
    done | head -n 1
}

export MYSQL_CONFIG_FILE=$(mysql_get_correct_config)

[ -z "$MYSQL_CONFIG_FILE" ] && echo "MYSQL_CONFIG_FILE is empty" && exit 1

unset -f mysql_get_correct_config mysql_get_config_files_scl

# we provide own config files for the container, so clean what rpm ships here
mkdir -p ${MYSQL_CONFIG_FILE}.d
rm -f ${MYSQL_CONFIG_FILE}.d/*

# we may add options during service init, so we need to have this dir writable by daemon user
chown -R mysql:0 ${MYSQL_CONFIG_FILE}.d ${MYSQL_CONFIG_FILE}
restorecon -R ${MYSQL_CONFIG_FILE}.d ${MYSQL_CONFIG_FILE}

# API of the container are standard paths /etc/my.cnf and /etc/my.cnf.d
# we already include own /etc/my.cnf for container, but for cases the
# actually used config file is not on standard path /etc/my.cnf, we
# need to move it to the location daemon expects it and create symlinks
if [ "$MYSQL_CONFIG_FILE" != "/etc/my.cnf" ] ; then
    rm -rf /etc/my.cnf.d
    mv /etc/my.cnf ${MYSQL_CONFIG_FILE}
    ln -s ${MYSQL_CONFIG_FILE} /etc/my.cnf
    ln -s ${MYSQL_CONFIG_FILE}.d /etc/my.cnf.d
fi

# setup directory for data
mkdir -p /var/lib/mysql/data
chown -R mysql:0 /var/lib/mysql
restorecon -R /var/lib/mysql

# Loosen permission bits for group to avoid problems running container with
# arbitrary UID
# When only specifying user, group is 0, that's why /var/lib/mysql must have
# owner mysql.0; that allows to avoid a+rwx for this dir
chmod g+w -R /var/lib/mysql ${MYSQL_CONFIG_FILE}.d