Re: [bu-users] trivial restore test failing

[Vincent S. <bu...@hi...>]

On Mon, Jan 19, 2009 at 11:29:36AM -0800, jack byers wrote:
> I havent used bu now for more than a year or two
> I want to test backing up a single dir with a single file to  /backupbu
> 
> and then to test restoring that backed up copy  to  /restorebu
> 
> the backup part goes as expected,
> but the restore part  fails-- "No new or changed files to back up"
> 
> I am probably misusing the bu tool, or doing something really stupid.
> 
> [root@bootp byers]# mkdir /backupbu
> [root@bootp byers]# mkdir /restorebu
> [root@bootp byers]# bu -d /backupbu drhmail09
> 
> Incremental:      on
> Backup directory: /backupbu
> 
> /home/byers/drhmail09 -> /backupbu/home/byers/drhmail09
> /home/byers/drhmail09/rhjan09 -> /backupbu/home/byers/drhmail09/rhjan09
> 
> 
> 
> ok for the backup
> 
> now try to restore from this /backupbu    to /restorebu  also using bu:
> 
> [root@bootp byers]# pwd
> /backupbu/home/byers
> [root@bootp byers]# bu -d /restorebu drhmail09
> 
> Incremental:      on
> Backup directory: /restorebu
> 
> No new or changed files to back up
> 
> [root@bootp byers]#
> 
> same response if try from  the top:
> root@bootp restorebu]# cd ..
> [root@bootp /]# bu -d /restorebu /backupbu
> 
> Incremental:      on
> Backup directory: /restorebu
> 
> No new or changed files to back up
> 
> [root@bootp /]#
> 
> 
> 
> I must be missing something really obvious
> any help  much appreciated
> Jack

Hi Jack.

Two things.  First, what version of bu are you running?  I just tried it
with "3.4 beta" and it worked.  I reproduced the same scenario you gave
me, even with the same file names.

Second, I suspect you are going to get the results you are expecting,
when trying to restore in this way.  If you are expecting to restore the
files back to their original locations under /restorebu where the
directory tree matches /backupbu, doing it with bu will not work.
Remember, bu reproduces the entire source path to each file underneath
the destination directory.

So going the opposite direction, you get:

$ pwd
/backupbu/u1/home/vince
$ bu -d /restorebu drhmail09

Incremental:      on 
Backup directory: /restorebu

/backupbu/u1/home/vince/drhmail09 -> /restorebu/backupbu/u1/home/vince/drhmail09
/backupbu/u1/home/vince/drhmail09/rhjan09 -> /restorebu/backupbu/u1/home/vince/drhmail09/rhjan09

So the backup directory, /backupbu, gets prepended to the file paths
inside /restorebu, since that is where the files are being backed up
from, rather than going in /restorebu/u1/home/vince/.

If that is OK for you then this should work, but I usually just use
cp, tar, cpio, or pax to restore files from the backup directory since
I have never added actual restore features to bu yet.