Re: [rdiff-backup-users] Re: rdiff-backup restore from read-only file system

[J. Norment]

Didn't send this out correctly the first time.  (Sorry, Kurt.)


J. Norment wrote:
> UnionFS looks great.  Unfortunately, I'm on an RPM based distro, so I 
> can't install .tgz w/o risking a dependency nightmare (as far as I 
> know) ...
>
> Andrew:
>
> I've done some testing with the restore command and it seems (as the 
> link you posted states) that it is possible to do the restores, it 
> just complains about not being able to write the log file.  I was able 
> to restore both a directory and a single file (as root).  I had what 
> seemed like permissions issues when I tried to restore as a user.  (It 
> errored and died.)  When restoring as root, however, it just 
> complained, but did not die.
>
> For the time being, at least, this is good enough for me.
>
> Out of curiosity, what are you using to write to CD?


> Kurt Yoder wrote:
> > That's what it'd designed for. Check
> >
> > http://en.wikipedia.org/wiki/UnionFS
> >
> > or google for "unionfs".
> >
> > On Aug 30, 2006, at 3:17 PM, J. Norment wrote:
> >
> > > I am currently backing up to DVD.  Can a UFS be used with a DVD?
> > >
> > > -- J.
> > >
> > >
> > > Kurt Yoder wrote:
> > > > On Aug 17, 2006, at 7:52 PM, Andrew Price wrote:
> > > >
> > > > > I've recently become the maintainer of a backup tool package which 
> > > > > uses
> > > > > rdiff-backup. In acquainting myself with the package I've noticed 
> > > > > that
> > > > > this read-only filesystem bug is pretty much a brick wall when it 
> > > > > comes
> > > > > to backing up to CD-ROMs.
> > > > >
> > > > > I appreciate that this problem hasn't been solved in rdiff-backup yet
> > > > > but I was wondering if there are any safe workarounds for it. To be
> > > > > honest I was surprised there isn't a switch to turn off the 
> > > > > logging to
> > > > > restore.log like --restore-read-only. But from reading this thread I
> > > > > guess the problem is more complicated to solve than that. Any 
> > > > > pointers
> > > > > to workarounds would be most appreciated.
> > > >
> > > > How about something like a "union file system". You mount the 
> > > > read-only version to a UFS. Any changes including restore.log would 
> > > > get logged to the writable branch of the UFS. When you're done, 
> > > > remove the UFS without writing the changes.
> > > >
> > > > -Kurt