Holger Parplies wrote at about 19:56:26 +0100 on Wednesday, March 20, 2013:
> Hi,
>
> Phil Kennedy wrote on 2013-03-20 12:37:10 -0400 [[BackupPC-users] Stop
> TrachClean / Return directories backup list]:
> > Hi,
> > I recently had a somewhat odd system failure (poorly configured software
> > RAID) that lead to a *very* old set of BackupPC config files being
> > loaded. On one windows machine (possibly more), the default SMB share
> > was reset to C$ instead of E$. The full count keep, plus the min keep
> > values were also set lower than we wanted them. BackupPC naturally
> > marked all the old E$ directories as trash, and has removed them from
> > the browse backup list.
> >
> > The good news (besides the fact that the previous admin of this box is
> > several states away and out of arms reach....) is that the backup
> > directories and their data still exist under the
> > /var/lib/backuppc/pool/hostname/backup number/ directory.
>
> You probably mean "pc", not "pool".
>
> > They just don't show up when you browse the backups.
>
> First of all, let's imagine what happens in the case you described.
> 2.) The history settings (FullKeepCnt, IncrKeepCnt, etc.) are changed.
> => On the next invocation of BackupPC_dump (with the correct options) for
> the host, normally on the next backup *attempt*, backups will be
> expired
> as defined by the new settings. This means that all backups no longer
> to be kept will be moved to $TopDir/trash. As I read the code, they
> will get a name consisting of time, process id, and counter. That
> means
> you will have a hard time identifying where they came from (because
> neither host name nor backup number will be visible any longer). The
> modification date of the subdirectories might give you a hint
> concerning the order they belong in.
You should be able to completely recreate the numbering plus the info
in the 'backups' file using the backupInfo file. Indeed, I believe the
plaintext hash that it represents includes all the necessary fields:
'noFill'
'nFilesNew'
'num'
'size"
'endTime'
'fillFromNum'
'xferErrs'
'xferMethod'
'startTime'
'sizeNewComp'
'mangle'
'version'
'nFilesExist'
'charset'
'tarErrs'
'xferBadShare'
'sizeExist'
'level'
'nFiles
'compress'
'sizeExistComp'
'type'
'xferBadFile'
'sizeNew'
> Note, though, that BackupPC_trashClean will become active by
> default every 5 minutes and delete everything in
> $TopDir/trash. You can increase the interval by setting
> $Conf {TrashCleanSleepSec}, but you should note that upon
> startup trashClean will empty the trash once before
> sleeping. You should be able to protect items already in
> the trash by setting permissions accordingly. trashClean
> just tries to unlink/rmdir the items, so if you 'chmod a=
> ...' a non-empty directory, it will simply fail and leave
> the directory where it is (for a file, this would obviously
> not work). Revoking write permission on $Topdir/trash itself
> should also stop trashClean, but I believe the code moving
> things there in the first place would then resort to
> deleting the trees instead.
Yes - anything not moved will be deleted directly by RmTreeDefer
> > 2. How can I tell TrashClean to take a couple days vacation while I sort
> > out the consistency of other 130 machines?
>
> Well, as I said, you could set $Conf {TrashCleanSleepSec} to a high value,
> but
> the point really is that you want to avoid the backups being trashed in the
> first place. What I'd probably do is stop BackupPC completely while I sort
> things out. Presuming that is not possible, I'd set $Conf {BackupsDisable} =
> 2
> in the main config.pl to disable all backups by default, and then re-enable
> them one by one for each host I have checked and corrected in the host.pl
> file.
> Note that I have not tested this. Perhaps someone could confirm that backups
> are not expired for hosts with BackupsDisable'd ...
Note that BackupPC_dump code has the following
usage comment:
# -e Just do an dump expiry check for the client. Don't do anything
# else. This is used periodically by BackupPC to make sure that
# dhcp hosts have correctly expired old backups. Without this,
# dhcp hosts that are no longer on the network will not expire
# old backups.
So, expiry is still called even if Backups are disabled... however,
the code for BackupPC_dump seems to exit before expiry if
BackupsDisable == 2 so you should be ok... but I would check/test as
Holger suggests...
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