Description:
Create a symbolic link for backup directory in itself. This will form infinite loop.
Now execute MEB where backup directory location is pointing to symbolic link.
MEB will fail such when backup-dir is pointed to more than 21 sub directories or symbolic links pointing to itself.
How to repeat:
[hs221732@fimafeng10]/export/home2/tmp: mkdir bkpdir
[hs221732@fimafeng10]/export/home2/tmp: ln -s /export/home2/tmp/bkpdir bkpdir/
This will form infinite loop of bkpdir
Now execute MEB
./mysqlbackup --datadir=/export/home2/tmp/mysql-5.1-meb-testing/mysql-test/var/mysqld.1/data/ --innodb_log_file_size=5M --innodb_log_files_in_group=4 --backup_innodb_log_files_in_group=4 --backup_innodb_log_file_size=5M --innodb_data_home_dir=/export/home2/tmp/mysql-5.1-meb-testing/mysql-test/var/mysqld.1/data/ --backup-dir=/export/home2/tmp/bkpdir/bkpdir/bkpdir/bkpdir/bkpdir/bkpdir/bkpdir/bkpdir/bkpdir/bkpdir/bkpdir/bkpdir/bkpdir/bkpdir/bkpdir/bkpdir/bkpdir/bkpdir/bkpdir/bkpdir/bkpdir/bkpdir/ --socket=/export/home2/tmp/mysql-5.1-meb-testing/mysql-test/var/tmp/mysqld.1.sock --user=root --port=13000 --protocol=tcp backup
Note that there are up to 21 sub directories of "bkpdir" for which backup passes but fails for 22nd onwards and gives the following error
Error: Failed to do configuration check of directories.
Possible failure from my_realpath() call.
The same failure can happen if the backup directory is made as chain of sub directories. MEB can handle only up to certain limit for sub directories and same rule applies for symbolic links also.
We need to document this max limit that MEB can handle for backup directories.
Description: Create a symbolic link for backup directory in itself. This will form infinite loop. Now execute MEB where backup directory location is pointing to symbolic link. MEB will fail such when backup-dir is pointed to more than 21 sub directories or symbolic links pointing to itself. How to repeat: [hs221732@fimafeng10]/export/home2/tmp: mkdir bkpdir [hs221732@fimafeng10]/export/home2/tmp: ln -s /export/home2/tmp/bkpdir bkpdir/ This will form infinite loop of bkpdir Now execute MEB ./mysqlbackup --datadir=/export/home2/tmp/mysql-5.1-meb-testing/mysql-test/var/mysqld.1/data/ --innodb_log_file_size=5M --innodb_log_files_in_group=4 --backup_innodb_log_files_in_group=4 --backup_innodb_log_file_size=5M --innodb_data_home_dir=/export/home2/tmp/mysql-5.1-meb-testing/mysql-test/var/mysqld.1/data/ --backup-dir=/export/home2/tmp/bkpdir/bkpdir/bkpdir/bkpdir/bkpdir/bkpdir/bkpdir/bkpdir/bkpdir/bkpdir/bkpdir/bkpdir/bkpdir/bkpdir/bkpdir/bkpdir/bkpdir/bkpdir/bkpdir/bkpdir/bkpdir/bkpdir/ --socket=/export/home2/tmp/mysql-5.1-meb-testing/mysql-test/var/tmp/mysqld.1.sock --user=root --port=13000 --protocol=tcp backup Note that there are up to 21 sub directories of "bkpdir" for which backup passes but fails for 22nd onwards and gives the following error Error: Failed to do configuration check of directories. Possible failure from my_realpath() call. The same failure can happen if the backup directory is made as chain of sub directories. MEB can handle only up to certain limit for sub directories and same rule applies for symbolic links also. We need to document this max limit that MEB can handle for backup directories.