Stephen,
On Sep 20, 2007, at 8:18 PM, Stephen Joyce wrote:
> Use 'mount' instead of checking for directory existence to
> determine if the filesystem is mounted and return the corresponding
> exit status? (if backuppc has created the directory structure on
> the main drive instead of a mounted one, it's safe to remove inside
> the script. Use 'rm' on each level working your way up, NOT 'rm -
> rf' on the parent, if you're paranoid or don't fully trust your
> script.)
>
> Or am I misunderstanding the problem?
>
Hey, that's a good idea. You certainly did not misunderstand the
problem, and I believe that will work. I do wish that there was a
way to prevent backuppc from even creating the filesystem in the
first place, but having a script clean it up is ok.
I would get nervous that it would somehow delete my whole backup tree
though - is there a way using a simple shell script to determine the
size of the contents of a directory? Certainly my backups would be
larger than 1 MB, and the default file structure for backuppc is
quite small, so I could just not delete anything if the directory
contains > 1 MB of data, and somehow alert myself about the problem.
Thoughts?
Thanks!
-- Kimball
> Cheers, Stephen
> --
> Stephen Joyce
> Systems Administrator P
> A N I C
> Physics & Astronomy Department Physics &
> Astronomy
> University of North Carolina at Chapel Hill Network
> Infrastructure
> voice: (919) 962-7214 and
> Computing
> fax: (919) 962-0480 http://
> www.panic.unc.edu
>
> Some people make the world turn and others just watch it spin.
> -- Jimmy Buffet
>
> On Thu, 20 Sep 2007, Kimball Larsen wrote:
>
>> Ok, I've done a bunch more research into this, and discovered the
>> problem:
>>
>> backuppc creates the target directories for the backup destination
>> BEFORE it calls BackupPC_dump, so my pre conditions are always
>> returning true, because BackupPC just created the necessary file
>> structure.
>>
>> So, I'm looking for either a) where is the check that decides to
>> create the file structure before doing a dump or b) how to re-
>> arrange my setup so that backupPC just fails if the destination
>> for the backup does not exist.
>>
>> Again, here's my setup:
>>
>> /Volumes/Honker <-- this is an external hard drive that is only
>> mounted periodically. When it is not mounted, /Volumes does NOT
>> have a "Honker" directory.
>>
>>
>> here's with my external drive disconnected:
>> MainEngineering:/Volumes root# pwd
>> /Volumes
>> MainEngineering:/Volumes root# ls -la
>> total 8
>> drwxrwxrwt 3 root admin 102 Sep 20 14:57 .
>> drwxr-xr-x 31 root wheel 1156 Sep 18 12:21 ..
>> lrwxr-xr-x 1 root admin 1 Sep 18 12:21 Guido -> /
>> MainEngineering:/Volumes root#
>>
>>
>> and again with it connected:
>> MainEngineering:/Volumes root# ls -la
>> total 8
>> drwxrwxrwt 4 root admin 136 Sep 20 14:58 .
>> drwxr-xr-x 31 root wheel 1156 Sep 18 12:21 ..
>> lrwxr-xr-x 1 root admin 1 Sep 18 12:21 Guido -> /
>> drwxr-xr-x 8 unknown unknown 374 Sep 20 14:45 Honker
>> MainEngineering:/Volumes root#
>>
>>
>> The problem is that if a Honker directory exists in /Volumes, then
>> when I attach the drive, it mounts as Honker-1, so my backups
>> don't get to the right file system.
>>
>> Help!
>>
>> -- Kimball
>> On Sep 20, 2007, at 1:24 PM, Kimball Larsen wrote:
>>
>>> (Sorry for the re-post - I realized I forgot to put on a subject
>>> last time)
>>> Hokay, I'm stuck. I give. I need help.
>>> The documentation for UserCmdCheckStatus says:
>>>
>>> "Whether the exit status of each PreUserCmd and PostUserCmd is
>>> checked.
>>>
>>> "If set and the Dump/Restore/Archive Pre/Post UserCmd returns
>>> a non-zero exit status then the dump/restore/archive is aborted.
>>> To maintain backward compatibility (where the exit status in
>>> early versions was always ignored), this flag defaults to 0.
>>>
>>> "If this flag is set and the Dump/Restore/Archive PreUserCmd
>>> fails then the matching Dump/Restore/Archive PostUserCmd is not
>>> executed. If DumpPreShareCmd returns a non-exit status, then
>>> DumpPostShareCmd is not executed, but the DumpPostUserCmd is
>>> still run (since DumpPreUserCmd must have previously succeeded).
>>>
>>> "An example of a DumpPreUserCmd that might fail is a script
>>> that snapshots or dumps a database which fails because of some
>>> database error."
>>> Simple enough - so I wrote a script to verify that the location
>>> to which I am about to try to backup actually exists (I'm backing
>>> up to a removable drive that does get removed, from time to time,
>>> and I only want the backups to run when the drive is attached).
>>> Then I set this script to the value for the various Pre conditions:
>>> $Conf{DumpPreUserCmd} = '$sshPath -q -x -l kimball $host /usr/
>>> local/bin/checkHonker';
>>> $Conf{DumpPostUserCmd} = undef;
>>> $Conf{DumpPreShareCmd} = '$sshPath -q -x -l kimball $host /usr/
>>> local/bin/checkHonker';
>>> $Conf{DumpPostShareCmd} = undef;
>>> $Conf{RestorePreUserCmd} = '$sshPath -q -x -l kimball $host /usr/
>>> local/bin/checkHonker';
>>> $Conf{RestorePostUserCmd} = undef;
>>> $Conf{ArchivePreUserCmd} = '$sshPath -q -x -l kimball $host /usr/
>>> local/bin/checkHonker';
>>> $Conf{ArchivePostUserCmd} = undef;
>>> and I set it to check the status of the user commands:
>>> $Conf{UserCmdCheckStatus} = 1;
>>> But it still runs the backup (and writes over my mount point for
>>> my external drive)
>>> I've verified that the script returns a non-zero when the drive
>>> is not present:
>>> sillyHost:~ backuppc$ /usr/bin/ssh -q -x -l kimball 192.168.0.21 /
>>> usr/local/bin/checkHonker
>>> Checking for Honker
>>> Honker NOT mounted
>>> sillyHost:~ backuppc $ echo $?
>>> 1
>>> What am I missing?
>>> -- Kimball
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>>
>>
>>
>> --
>>
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