Cannot connect via Unix socket

[allenap]

I'm having problems connecting to MySQL 5.7 on macOS, using version 0.1.6 (from LTS Haskell 12.26). I get:

ConnectionError {
    errFunction = "connect",
    errNumber = 2002,
    errMessage = "Can't connect to MySQL server on 'localhost' (22)"
}

I have a mysqld running in a temporary folder, to which I can connect manually with mysql and ping it with mysqladmin. The parameters I'm using to connect:

ConnectInfo {
    connectHost = "localhost",
    connectPort = 0,
    connectUser = "gavin",
    connectPassword = "",
    connectDatabase = "test",
    connectOptions = [CharsetName "utf8", Protocol Socket],
    connectPath = "/some/temp/dir/mysqld.sock",
    connectSSL = Nothing
}

I've tried variations of connectHost and connectPort without success. The mysql_real_connect docs suggest that "localhost" is appropriate for host when trying to connect via a Unix socket.

I'm using a binary distribution of MySQL 5.7 from Oracle. mysqld was launched with:

        System.Process.spawnProcess "/path/to/mysql/bin/mysqld"
          [ "--no-defaults",
            "--skip-networking",
            "--datadir=/some/temp/dir/data",
            "--lc-messages-dir=/path/to/mysql/share",
            "--explicit_defaults_for_timestamp",
            "--skip-ssl",
            "--pid-file=/some/temp/dir/mysqld.pid",
            "--socket=/some/temp/dir/mysqld.sock",
            "--tmpdir=/some/temp/dir/tmp",
            "--user=gavin"
            ]

Any ideas? Thanks!

[paul-rouse]

I can't see an obvious problem there. I can run an application which uses "localhost" to connect via a Unix socket on Ubuntu, so I think it must be a configuration or permission issue.

[allenap]

Thank you for checking. I'll keep trying things, and I'll update here if I figure something out.