The backupdir warn/error discussion. Was:RE: bzr commit into mysql-6.0-backup branch (cbell:2648) Bug#35230

[Chuck Bell]

Svoj, Rafal,

Our discussion today on IRC was about whether the server should warn or
error is user specifies an invalid path for --backupdir on startup.

There are several options:
a) leave code as is: throw error and stop
b) print a warning and use default value for backupdir
c) print a warning and use the patch specified for backupdir

In the effort to try and get this work into the next build, I have decided
to implement option c). I think this concurs with both of your opinions on
that matter.

I have also added code to validate backupdir prior backup or restore. An
error message like the following is printed if backupdir is invalid:

mysql> backup database test to 'b1.bak';
ERROR 1723 (HY000): The path specified for the variable backupdir cannot be
accessed or is invalid. ref: something\invalid/goes/here

Peter: Do you disagree with this decision? 

Chuck