Crash when entrypoint inits database and passing init-connect argument with whitespace

[Alex1s]

Use this docker-compose.yaml

services:
  sql:
    image: docker.io/mariadb:10.11.7
    ports:
    - "3306:3306"
    environment:
      - MYSQL_USER=${MYSQL_USER:?}
      - MYSQL_DATABASE=${MYSQL_DATABASE:?}
      - MYSQL_PASSWORD=${MYSQL_PASSWORD:?}
      - MYSQL_ROOT_PASSWORD=${MYSQL_ROOT_PASSWORD:?}
    command:
      - "--default-time-zone=Europe/Berlin"
      - "--character-set-server=utf8mb4"
      - "--collation-server=utf8mb4_unicode_520_ci"
      - "--init-connect=SET NAMES utf8mb4 COLLATE utf8mb4_unicode_520_ci"
    volumes:
      - "database:/var/lib/mysql"
      - sql-backup-load-vol:/docker-entrypoint-initdb.d

and make sure the database volume is empty while the sql-backup-load-vol volume contains a backup.sql.xz file.

Then following error will be produced:

sql-1  | 2024-05-05T16:48:40+02:00 2024-05-05 14:48:40+00:00 [Note] [Entrypoint]: Entrypoint script for MariaDB Server 1:10.11.7+maria~ubu2204 started.
sql-1  | 2024-05-05T16:48:42+02:00 2024-05-05 14:48:42+00:00 [Warn] [Entrypoint]: /sys/fs/cgroup///memory.pressure not writable, functionality unavailable to MariaDB
sql-1  | 2024-05-05T16:48:42+02:00 2024-05-05 14:48:42+00:00 [Note] [Entrypoint]: Switching to dedicated user 'mysql'
sql-1  | 2024-05-05T16:48:43+02:00 2024-05-05 14:48:43+00:00 [Note] [Entrypoint]: Entrypoint script for MariaDB Server 1:10.11.7+maria~ubu2204 started.
sql-1  | 2024-05-05T16:48:48+02:00 2024-05-05 14:48:48+00:00 [Note] [Entrypoint]: Initializing database files
sql-1  | 2024-05-05T16:48:50+02:00 2024-05-05 14:48:50 0 [Warning] mariadbd: io_uring_queue_init() failed with ENOSYS: check seccomp filters, and the kernel version (newer than 5.1 required)
sql-1  | 2024-05-05T16:48:50+02:00 2024-05-05 14:48:50 0 [Warning] InnoDB: liburing disabled: falling back to innodb_use_native_aio=OFF
sql-1  | 2024-05-05T16:48:51+02:00 /usr/sbin/mariadbd: Too many arguments (first extra is 'NAMES').
sql-1  | 2024-05-05T16:48:51+02:00 2024-05-05 14:48:51 0 [ERROR] Aborting
sql-1  | 2024-05-05T16:48:54+02:00
sql-1  | 2024-05-05T16:48:54+02:00 Installation of system tables failed!  Examine the logs in
sql-1  | 2024-05-05T16:48:54+02:00 /var/lib/mysql/ for more information.
sql-1  | 2024-05-05T16:48:54+02:00
sql-1  | 2024-05-05T16:48:54+02:00 The problem could be conflicting information in an external
sql-1  | 2024-05-05T16:48:54+02:00 my.cnf files. You can ignore these by doing:
sql-1  | 2024-05-05T16:48:54+02:00
sql-1  | 2024-05-05T16:48:54+02:00     shell> /usr/bin/mariadb-install-db --defaults-file=~/.my.cnf
sql-1  | 2024-05-05T16:48:54+02:00
sql-1  | 2024-05-05T16:48:54+02:00 You can also try to start the mariadbd daemon with:
sql-1  | 2024-05-05T16:48:54+02:00
sql-1  | 2024-05-05T16:48:54+02:00     shell> /usr/sbin/mariadbd --skip-grant-tables --general-log &
sql-1  | 2024-05-05T16:48:54+02:00
sql-1  | 2024-05-05T16:48:54+02:00 and use the command line tool /usr/bin/mariadb
sql-1  | 2024-05-05T16:48:54+02:00 to connect to the mysql database and look at the grant tables:
sql-1  | 2024-05-05T16:48:54+02:00
sql-1  | 2024-05-05T16:48:54+02:00     shell> /usr/bin/mariadb -u root mysql
sql-1  | 2024-05-05T16:48:54+02:00     MariaDB> show tables;
sql-1  | 2024-05-05T16:48:54+02:00
sql-1  | 2024-05-05T16:48:54+02:00 Try '/usr/sbin/mariadbd --help' if you have problems with paths.  Using
sql-1  | 2024-05-05T16:48:54+02:00 --general-log gives you a log in /var/lib/mysql/ that may be helpful.
sql-1  | 2024-05-05T16:48:54+02:00
sql-1  | 2024-05-05T16:48:54+02:00 The latest information about mysql_install_db is available at
sql-1  | 2024-05-05T16:48:54+02:00 https://mariadb.com/kb/en/installing-system-tables-mysql_install_db
sql-1  | 2024-05-05T16:48:54+02:00 You can find the latest source at https://downloads.mariadb.org and
sql-1  | 2024-05-05T16:48:54+02:00 the maria-discuss email list at https://launchpad.net/~maria-discuss
sql-1  | 2024-05-05T16:48:54+02:00
sql-1  | 2024-05-05T16:48:54+02:00 Please check all of the above before submitting a bug report
sql-1  | 2024-05-05T16:48:54+02:00 at https://mariadb.org/jira
sql-1  | 2024-05-05T16:48:54+02:00

When the database is already init, this error does not occur. I think it is a problem with the entrypoint script, at the point where it tries to init the database and properly handling the whitespace of the init-connect argument.

[Alex1s]

So it seems that the docker-entrypoint.sh properly passes the arguments, to mariadb-install-db (source code here). But mariadb-install-db does some processing of the arguments which expands the argument with whitespace to multiple arguments before passing them to mariadbd (see here).
As mariadb-install-db is written in sh I don't know how to prevent the whitespace argument from expanding without changing to bash or something else ...

Another option would be to not pass the --init-connect argument to mariadb-install-db in the docker-entrypoint.sh.

[grooverdan]

Yep, you got it right. The only real POSIX array is '$@' that can be manipulated with set -- $newargs ref. Looking again, this might be fixable upstream.

I'm still considering your workaround.