/migrations: Can't connect to database server without a password

[Al2Klimov]

To Reproduce

1. Setup a module, in my case https://github.com/RISE-GmbH/icingaweb2-module-oidc v0.6.7, which meets the following criteria:
   • Provides DbMigration hook
   • Has released a newer version than yours, in my case v0.6.9, which actually uses its DbMigration hook for a schema upgrade
   • Also in my case, it should be enough to just import the schema and select a new DB resource
   • Do not use a password for DB access! (*nix socket required, example below.)
2. Upgrade that module to a newer version containing a schema upgrade
3. Visit /migrations

[oidc]
charset=utf8
db=mysql
dbname=oidc
host=localhost
type=db
username=icingaweb2

Describe the bug

/migrations throws an exception.

Screenshots

Can't connect to database server without a password

Expected behavior

Err.. yes, you can! If you can connect without a password during setup, you can also during migration.

My workaround even proves it:

--- a/modules/setup/library/Setup/Utils/DbTool.php
+++ b/modules/setup/library/Setup/Utils/DbTool.php
@@ -184,2 +183,0 @@
-        } elseif (! isset($this->config['password'])) {
-            throw new ConfigurationError('Can\'t connect to database server without a password');

It re-enabled /migrations and I successfully applied the schema upgrade.

I can make a PR if you wish, but I guess you'd prefer a more fine check instead on whether the resource points to a *nix socket. E.g "localhost" in case of MySQL.

Your Environment

• Icinga Web 2 version and modules (System - About): d658c73
• Web browser used: Safari
• Icinga 2 version used (icinga2 --version): -
• PHP version used (php --version): 8.3.25
• Server operating system and version: NixOS 25.05

Additional context

This is the whole system, for reference: https://github.com/Al2Klimov/iw2.aklimov.net-dump.de