nixpkgs/nixos/modules/services/web-apps/moodle.nix
2019-08-25 08:12:28 -04:00

301 lines
9.1 KiB
Nix

{ config, lib, pkgs, ... }:
let
inherit (lib) mkDefault mkEnableOption mkForce mkIf mkMerge mkOption types;
inherit (lib) concatStringsSep literalExample mapAttrsToList optional optionalString;
cfg = config.services.moodle;
fpm = config.services.phpfpm.pools.moodle;
user = "moodle";
group = config.services.httpd.group;
stateDir = "/var/lib/moodle";
moodleConfig = pkgs.writeText "config.php" ''
<?php // Moodle configuration file
unset($CFG);
global $CFG;
$CFG = new stdClass();
$CFG->dbtype = '${ { "mysql" = "mariadb"; "pgsql" = "pgsql"; }.${cfg.database.type} }';
$CFG->dblibrary = 'native';
$CFG->dbhost = '${cfg.database.host}';
$CFG->dbname = '${cfg.database.name}';
$CFG->dbuser = '${cfg.database.user}';
${optionalString (cfg.database.passwordFile != null) "$CFG->dbpass = file_get_contents('${cfg.database.passwordFile}');"}
$CFG->prefix = 'mdl_';
$CFG->dboptions = array (
'dbpersist' => 0,
'dbport' => '${toString cfg.database.port}',
${optionalString (cfg.database.socket != null) "'dbsocket' => '${cfg.database.socket}',"}
'dbcollation' => 'utf8mb4_unicode_ci',
);
$CFG->wwwroot = '${if cfg.virtualHost.enableSSL then "https" else "http"}://${cfg.virtualHost.hostName}';
$CFG->dataroot = '${stateDir}';
$CFG->admin = 'admin';
$CFG->directorypermissions = 02777;
$CFG->disableupdateautodeploy = true;
$CFG->pathtogs = '${pkgs.ghostscript}/bin/gs';
$CFG->pathtophp = '${pkgs.php}/bin/php';
$CFG->pathtodu = '${pkgs.coreutils}/bin/du';
$CFG->aspellpath = '${pkgs.aspell}/bin/aspell';
$CFG->pathtodot = '${pkgs.graphviz}/bin/dot';
require_once('${cfg.package}/share/moodle/lib/setup.php');
// There is no php closing tag in this file,
// it is intentional because it prevents trailing whitespace problems!
'';
mysqlLocal = cfg.database.createLocally && cfg.database.type == "mysql";
pgsqlLocal = cfg.database.createLocally && cfg.database.type == "pgsql";
in
{
# interface
options.services.moodle = {
enable = mkEnableOption "Moodle web application";
package = mkOption {
type = types.package;
default = pkgs.moodle;
defaultText = "pkgs.moodle";
description = "The Moodle package to use.";
};
initialPassword = mkOption {
type = types.str;
example = "correcthorsebatterystaple";
description = ''
Specifies the initial password for the admin, i.e. the password assigned if the user does not already exist.
The password specified here is world-readable in the Nix store, so it should be changed promptly.
'';
};
database = {
type = mkOption {
type = types.enum [ "mysql" "pgsql" ];
default = "mysql";
description = ''Database engine to use.'';
};
host = mkOption {
type = types.str;
default = "localhost";
description = "Database host address.";
};
port = mkOption {
type = types.int;
description = "Database host port.";
default = {
"mysql" = 3306;
"pgsql" = 5432;
}.${cfg.database.type};
defaultText = "3306";
};
name = mkOption {
type = types.str;
default = "moodle";
description = "Database name.";
};
user = mkOption {
type = types.str;
default = "moodle";
description = "Database user.";
};
passwordFile = mkOption {
type = types.nullOr types.path;
default = null;
example = "/run/keys/moodle-dbpassword";
description = ''
A file containing the password corresponding to
<option>database.user</option>.
'';
};
socket = mkOption {
type = types.nullOr types.path;
default =
if mysqlLocal then "/run/mysqld/mysqld.sock"
else if pgsqlLocal then "/run/postgresql"
else null;
defaultText = "/run/mysqld/mysqld.sock";
description = "Path to the unix socket file to use for authentication.";
};
createLocally = mkOption {
type = types.bool;
default = true;
description = "Create the database and database user locally.";
};
};
virtualHost = mkOption {
type = types.submodule ({
options = import ../web-servers/apache-httpd/per-server-options.nix {
inherit lib;
forMainServer = false;
};
});
example = {
hostName = "moodle.example.org";
enableSSL = true;
adminAddr = "webmaster@example.org";
sslServerCert = "/var/lib/acme/moodle.example.org/full.pem";
sslServerKey = "/var/lib/acme/moodle.example.org/key.pem";
};
description = ''
Apache configuration can be done by adapting <option>services.httpd.virtualHosts</option>.
See <xref linkend="opt-services.httpd.virtualHosts"/> for further information.
'';
};
poolConfig = mkOption {
type = with types; attrsOf (oneOf [ str int bool ]);
default = {
"pm" = "dynamic";
"pm.max_children" = 32;
"pm.start_servers" = 2;
"pm.min_spare_servers" = 2;
"pm.max_spare_servers" = 4;
"pm.max_requests" = 500;
};
description = ''
Options for the Moodle PHP pool. See the documentation on <literal>php-fpm.conf</literal>
for details on configuration directives.
'';
};
};
# implementation
config = mkIf cfg.enable {
assertions = [
{ assertion = cfg.database.createLocally -> cfg.database.user == user;
message = "services.moodle.database.user must be set to ${user} if services.moodle.database.createLocally is set true";
}
{ assertion = cfg.database.createLocally -> cfg.database.passwordFile == null;
message = "a password cannot be specified if services.moodle.database.createLocally is set to true";
}
];
services.mysql = mkIf mysqlLocal {
enable = true;
package = mkDefault pkgs.mariadb;
ensureDatabases = [ cfg.database.name ];
ensureUsers = [
{ name = cfg.database.user;
ensurePermissions = {
"${cfg.database.name}.*" = "SELECT, INSERT, UPDATE, DELETE, CREATE, CREATE TEMPORARY TABLES, DROP, INDEX, ALTER";
};
}
];
};
services.postgresql = mkIf pgsqlLocal {
enable = true;
ensureDatabases = [ cfg.database.name ];
ensureUsers = [
{ name = cfg.database.user;
ensurePermissions = { "DATABASE ${cfg.database.name}" = "ALL PRIVILEGES"; };
}
];
};
services.phpfpm.pools.moodle = {
inherit user group;
phpEnv.MOODLE_CONFIG = "${moodleConfig}";
phpOptions = ''
zend_extension = opcache.so
opcache.enable = 1
'';
settings = {
"listen.owner" = config.services.httpd.user;
"listen.group" = config.services.httpd.group;
} // cfg.poolConfig;
};
services.httpd = {
enable = true;
adminAddr = mkDefault cfg.virtualHost.adminAddr;
extraModules = [ "proxy_fcgi" ];
virtualHosts = [ (mkMerge [
cfg.virtualHost {
documentRoot = mkForce "${cfg.package}/share/moodle";
extraConfig = ''
<Directory "${cfg.package}/share/moodle">
<FilesMatch "\.php$">
<If "-f %{REQUEST_FILENAME}">
SetHandler "proxy:unix:${fpm.socket}|fcgi://localhost/"
</If>
</FilesMatch>
Options -Indexes
DirectoryIndex index.php
</Directory>
'';
}
]) ];
};
systemd.tmpfiles.rules = [
"d '${stateDir}' 0750 ${user} ${group} - -"
];
systemd.services.moodle-init = {
wantedBy = [ "multi-user.target" ];
before = [ "phpfpm-moodle.service" ];
after = optional mysqlLocal "mysql.service" ++ optional pgsqlLocal "postgresql.service";
environment.MOODLE_CONFIG = moodleConfig;
script = ''
${pkgs.php}/bin/php ${cfg.package}/share/moodle/admin/cli/check_database_schema.php && rc=$? || rc=$?
[ "$rc" == 1 ] && ${pkgs.php}/bin/php ${cfg.package}/share/moodle/admin/cli/upgrade.php \
--non-interactive \
--allow-unstable
[ "$rc" == 2 ] && ${pkgs.php}/bin/php ${cfg.package}/share/moodle/admin/cli/install_database.php \
--agree-license \
--adminpass=${cfg.initialPassword}
true
'';
serviceConfig = {
User = user;
Group = group;
Type = "oneshot";
};
};
systemd.services.moodle-cron = {
description = "Moodle cron service";
after = [ "moodle-init.service" ];
environment.MOODLE_CONFIG = moodleConfig;
serviceConfig = {
User = user;
Group = group;
ExecStart = "${pkgs.php}/bin/php ${cfg.package}/share/moodle/admin/cli/cron.php";
};
};
systemd.timers.moodle-cron = {
description = "Moodle cron timer";
wantedBy = [ "timers.target" ];
timerConfig = {
OnCalendar = "minutely";
};
};
systemd.services.httpd.after = optional mysqlLocal "mysql.service" ++ optional pgsqlLocal "postgresql.service";
users.users."${user}".group = group;
};
}