mysql 8 migration - handle script as command

This allows the container to finish once the dump as been made
to allow the next migration to start.

With this, we've used the root user to allow changing of ownership
of the mysqldump volume.

Because of MDEV-20912 being resolved we don't need to manually change
collations.

Author: grooverdan

examples/migration-8.0/compose-mysql8.0.yml

@@ -52,6 +52,7 @@ services:
      mysql:
        condition: service_healthy
     restart: "no"
+    user: root
     command: /docker-entrypoint-initdb.d/dump-mysql.sh
     volumes:
       - mysqldump:/etc/dump/
@@ -69,13 +70,7 @@ services:
 
 volumes:
   dbdata: {}
-  # sudo chown -R 999:999 ${PWD}/dump-data # on host before running this file
   mysqldump:
-    driver: local
-    driver_opts:
-      type: none
-      device: "${PWD}/dump-data"
-      o: bind
 
 networks:
   backend:

examples/migration-8.0/dump-mysql.sh

@@ -3,7 +3,9 @@
 echo 'MariaDB service started.'
 # Run your commands and exit container
 whoami # mysql
-# sh -c "chown -R mysql:mysql /etc/dump" # Operation permitted
+if [ "$(whoami)" = root ]; then
+    chown -R mysql:mysql /etc/dump
+fi
 echo 'Remove files if exist'
 files=("mysql-dump-data.sql.zst" "mysql-dump-users.sql.zst" "mysql-dump-stats.sql.zst" "mysql-dump-tzs.sql.zst")
 for fileName in "${files[@]}"; do
@@ -14,15 +16,15 @@ for fileName in "${files[@]}"; do
 done
 echo 'Dump and compress MySQL data with changed collation ...'
 fileName="mysql-dump-data.sql.zst"
-sh -c "mariadb-dump -h${MYSQL_CONT_NAME} -uroot -p${MARIADB_ROOT_PASSWORD} ${MARIADB_DB} | sed 's/utf8mb4_0900/uca1400/g' | zstd > /etc/dump/${fileName}"
+gosu mysql sh -c "mariadb-dump --ssl-verify-server-cert=OFF -h${MYSQL_CONT_NAME} -uroot -p${MARIADB_ROOT_PASSWORD} ${MARIADB_DB} | zstd > /etc/dump/${fileName}"
 echo 'Dump and compress MySQL users ...'
 fileName="mysql-dump-users.sql.zst"
-sh -c "mariadb-dump -h${MYSQL_CONT_NAME} -uroot -p${MARIADB_ROOT_PASSWORD} --system=users | zstd > /etc/dump/${fileName}"
+gosu mysql sh -c "mariadb-dump --ssl-verify-server-cert=OFF -h${MYSQL_CONT_NAME} -uroot -p${MARIADB_ROOT_PASSWORD} --system=users | zstd > /etc/dump/${fileName}"
 echo 'Dump and compress MySQL stats ...'
 fileName="mysql-dump-stats.sql.zst"
-sh -c "mariadb-dump -h${MYSQL_CONT_NAME} -uroot -p${MARIADB_ROOT_PASSWORD} --system=stats | zstd > /etc/dump/${fileName}"
+gosu mysql sh -c "mariadb-dump --ssl-verify-server-cert=OFF -h${MYSQL_CONT_NAME} -uroot -p${MARIADB_ROOT_PASSWORD} --system=stats | zstd > /etc/dump/${fileName}"
 echo 'Dump and compress MySQL timezones ...'
 fileName="mysql-dump-tzs.sql.zst"
-sh -c "mariadb-dump -h${MYSQL_CONT_NAME} -uroot -p${MARIADB_ROOT_PASSWORD} --system=timezones | zstd > /etc/dump/${fileName}"
-echo 'Show MySQL 8.0 create user'
-sh -c "mariadb -h${MYSQL_CONT_NAME} -uroot -p${MARIADB_ROOT_PASSWORD} -e 'SELECT @@print_identified_with_as_hex; show create user current_user();'"
+gosu mysql sh -c "mariadb-dump --ssl-verify-server-cert=OFF -h${MYSQL_CONT_NAME} -uroot -p${MARIADB_ROOT_PASSWORD} --system=timezones | zstd > /etc/dump/${fileName}"
+echo 'Show MySQL 8.x create user'
+gosu mysql sh -c "mariadb --ssl-verify-server-cert=OFF -h${MYSQL_CONT_NAME} -uroot -p${MARIADB_ROOT_PASSWORD} -e 'SELECT @@print_identified_with_as_hex; show create user current_user();'"