57 lines
1.9 KiB
Bash
Executable File
57 lines
1.9 KiB
Bash
Executable File
#!/bin/bash
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#
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# Scripts to run by MySQL systemd service
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#
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# Needed argument: pre
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#
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# pre mode : try to perform sanity check for configuration, log, data
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# Read a config option from mysql. Note that this will only work if a config
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# file actually specifies the option, so it's important to specify a default
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# $1 is application (e.g. mysqld for server)
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# $2 is option
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# $3 is default value used if no config value is found
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get_mysql_option() {
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result=$(my_print_defaults "$1" | sed -n "s/^--$2=//p" | tail -n 1)
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if [ -z "$result" ];
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then
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result="$3"
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fi
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echo "$result"
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}
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sanity () {
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if [ ! -r /etc/mysql/my.cnf ]; then
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echo "MySQL configuration not found at /etc/mysql/my.cnf. Please create one."
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exit 1
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fi
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datadir=$(get_mysql_option mysqld datadir "/var/lib/mysql")
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if [ ! -d "${datadir}" ] && [ ! -L "${datadir}" ]; then
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echo "MySQL data dir not found at ${datadir}. Please create one."
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exit 1
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fi
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if [ ! -d "${datadir}/mysql" ] && [ ! -L "${datadir}/mysql" ]; then
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echo "MySQL system database not found in ${datadir}. Please run mysqld --initialize."
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exit 1
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fi
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# Do a test start to make sure there are no configuration issues or similar
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# mysqld --verbose --help will output a full listing of settings and plugins.
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# To do so it needs to initialize the database, so it can be used as a test
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# for whether or not the server can start. We redirect stdout to /dev/null so
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# only the error messages are left.
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result=0
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output=$(mysqld --verbose --help --innodb-read-only 2>&1 > /dev/null) || result=$?
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if [ ! "$result" = "0" ]; then
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echo "ERROR: Unable to start MySQL server:" >&2
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echo "$output" >&2
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echo "Please take a look at https://wiki.debian.org/Teams/MySQL/FAQ for tips on fixing common upgrade issues." >&2
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echo "Once the problem is resolved, restart the service." >&2
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exit 1
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fi
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}
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case $1 in
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"pre") sanity ;;
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esac
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