[Box Backup-dev] Access Denied common exception

[Chris Wilson]

Hi all,

I'd like to add a new common exception type to Box Backup. When file 
permissions stop a file or directory from being opened, the Common 
OSFileOpenError exception is thrown. In my opinion, this is not detailed 
enough to help the user to diagnose the problem.

I applied this patch to Boxi's copy of Box Backup:

svn diff -r 379:383 
https://svn.sourceforge.net/svnroot/boxi/trunk/boxi/boxbackup/lib/common

and also a separate patch to do the same thing for opendir() in 
bin/bbackupd/BackupClientDirectoryRecord.cpp, but I have not yet split 
that patch out from the other changes I've made to my copy of 
BackupClientDirectoryRecord.

Are there any objections to doing this? Could it be merged into the trunk? 
If so, I'll split out the opendir() changes as well and put everything 
into the merge branch for review.

Cheers, Chris.
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