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: Support encrypted redo and undo logs PXB-1626
This patch adds support for encrypted redo and undo logs.
Since redo and undo logs are just a special case of InnoDB
tablespaces, changes needed to support them are minimal:
- xtrabackup now recognises `--innodb_redo_log_encrypt' and
`innodb_undo_log_encrypt' server variables. Values of these
variables are saved to `backup-my.cnf' and used for prepare.
- instead of using a keyring plugin for the case when
`--transition-key' is specified, xtrabackup will look for
encryption key in the `xtrabackup_keys' file.
- since encrypted redo log is decrypted by `recv_read_log_seg',
xtrabackup will encrypt it before writing to `xtrabackup_logfile'.