nixpkgs/modules/services/databases/mysql.nix

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{ config, pkgs, ... }:
with pkgs.lib;
let
cfg = config.services.mysql;
mysql = cfg.mysql;
pidFile = "${cfg.pidDir}/mysqld.pid";
mysqldOptions =
"--user=${cfg.user} --datadir=${cfg.dataDir} " +
"--log-error=${cfg.logError} --pid-file=${pidFile}";
in
{
###### interface
options = {
services.mysql = {
enable = mkOption {
default = false;
description = "
Whether to enable the MySQL server.
";
};
mysql = mkOption {
default = pkgs.mysql;
description = "
Which MySQL derivation to use.
";
};
port = mkOption {
default = "3306";
description = "Port of MySQL";
};
user = mkOption {
default = "mysql";
description = "User account under which MySQL runs";
};
dataDir = mkOption {
default = "/var/mysql"; # !!! should be /var/db/mysql
description = "Location where MySQL stores its table files";
};
logError = mkOption {
default = "/var/log/mysql_err.log";
description = "Location of the MySQL error logfile";
};
pidDir = mkOption {
default = "/var/run/mysql";
description = "Location of the file which stores the PID of the MySQL server";
};
initialDatabases = mkOption {
default = [];
description = "List of database names and their initial schemas that should be used to create databases on the first startup of MySQL";
example = [
{ name = "foodatabase"; schema = ./foodatabase.sql; }
{ name = "bardatabase"; schema = ./bardatabase.sql; }
];
};
};
};
###### implementation
config = mkIf config.services.mysql.enable {
users.extraUsers = singleton
{ name = "mysql";
description = "MySQL server user";
};
environment.systemPackages = [mysql];
jobs.mysql =
{ description = "MySQL server";
startOn = "started network-interfaces";
preStart =
''
if ! test -e ${cfg.dataDir}/mysql; then
mkdir -m 0700 -p ${cfg.dataDir}
chown -R ${cfg.user} ${cfg.dataDir}
${mysql}/bin/mysql_install_db ${mysqldOptions}
fi
mkdir -m 0700 -p ${cfg.pidDir}
chown -R ${cfg.user} ${cfg.pidDir}
'';
exec = "${mysql}/libexec/mysqld ${mysqldOptions}";
postStart =
''
# Wait until the MySQL server is available for use
count=0
while [ ! -e /tmp/mysql.sock ]
do
if [ $count -eq 30 ]
then
echo "Tried 30 times, giving up..."
exit 1
fi
echo "MySQL daemon not yet started. Waiting for 1 second..."
count=$((count++))
sleep 1
done
# Create initial databases
${concatMapStrings (database:
''
if ! test -e "${cfg.dataDir}/${database.name}"; then
echo "Creating initial database: ${database.name}"
( echo "create database ${database.name};"
echo "use ${database.name};"
if [ -f "${database.schema}" ]
then
cat ${database.schema}
elif [ -d "${database.schema}" ]
then
cat ${database.schema}/mysql-databases/*.sql
fi
) | ${mysql}/bin/mysql -u root -N
fi
'') cfg.initialDatabases}
'';
# !!! Need a postStart script to wait until mysqld is ready to
# accept connections.
extraConfig = "kill timeout 60";
};
};
}