On Tue, Jun 02, 2009 at 04:17:18PM -0400, Jeffrey J. Kosowsky wrote:
> Pieter Wuille wrote at about 21:40:46 +0200 on Tuesday, June 2, 2009:
> > On Tue, Jun 02, 2009 at 12:31:54PM -0400, Jeffrey J. Kosowsky wrote:
> > > Pieter Wuille wrote at about 17:57:06 +0200 on Tuesday, June 2, 2009:
> > <cut>
> > > > If anyone's interested at trying/looking at it:
> > > > https://svn.ulyssis.org/repos/sipa/backuppc-fuse/backuppcfs.pl
> > > >
> > <cut>
> > > > It is only tested on one 3.1 backuppc pool on a Ubuntu 8.04 system,
> and not
> > > > very extensively. It only opens files/directories in read-only mode,
> thus
> > > > shouldn't be able to damage a working backuppc pool if something goes
> wrong.
> > > >
> > > > I'd like to get some feedback; ideas, bugreports, ... are very
> welcome.
> > >
> > > Just took a quick spin on it -- looks AWESOME!
> > > In my mind this is the way to go and *much* more useful and infinitely
> > > faster than trying to navigate the web interface. This gives me
> > > *exactly* what I want which is rapid access to all my backup files in
> > > a CLI format that allows me to apply common *nix utilities like 'cp',
> 'less'
> > > 'grep', 'diff' etc. to examine and manipulate different backup
> > > versions.
> > Thanks :)
> >
> > > Couple of questions/comments:
> > > 1. Is there anyway to get the root share directory to mount as '/'
> > > rather than as '_/"? Having root mount differently detracts a
> > > little from the naturalness of it all.
> >
> > It shouldn't be too hard to change that. The only problem is what to do
> when
> > you have a '/' share and a '/etc' share, and he '/' share contains a 'etc'
> > dir/file/.... probably won't occur, and i agree it's a more natural way.
>
> You could always add a flag that would add an (arbitrary) base name to
> the root share if needed.
Updated version online - it tries to merge virtual share-directories with the
backup content of the parent directory if possible (recursively - eg. if
you have a / and a /usr/local in separate shares it should still work, adding
a merged /usr in the process). Otherwise it will try adding _ or _<num> to
create unique filenames.
> > > 2. What happens when a new backup is run while the fusefs is mounted?
> > > Is there an easy way to get the new backup to appear automagically
> > > or do you need to unmount/remount?
> > Refreshing of nodes in the directory cache occurs when:
> > - an expire happens (depending on where in the filesystem, the TTL is
> > either 80000s, 40000s or 1000000s (see the source code))
> > - there's a request for something inexisting. eg. if a new backup #35
> > is created while the cache only has backups up to #34, and you'd do a
> > "cd 35" even though "ls" does not show a dir '35', it should work
> > (and the 35 should exist afterwards in the listing too) - untested though
> Would a refresh of the parent node catch a newly created backup before
> the timeout?
Yes. A refresh is a refresh - whether it is caused by a cache that expired or
by requesting something non-existing. So if you do a "cd 35" in the above
example case while the cache is not yet expired, the host-dir-node will be
refreshed on the fly, the cd will succeed, and the '35' directory will show
up in listings afterwards.
> > > 3. What happens when a backup is expired or deleted while the fusefs
> > > is mounted?
> > Completely untested... i assume a lot of errors might occur when you try to
> > read files - maybe empty files, crashes, ...
> > Errors don't propagate upwards in the tree, so only a refresh of the parent
> > node in the tree would fix it - so either an expire or the request of
> something
> > inexisting.
>
> Probably should be tested at some point... and then behaviors adjusted
> to minimize the nastiness of and maximize the recovery from any
> resulting errors.
I did some marginal testing and fixed a couple of bugs. You may temporarily
get strange results in such a case (eg. files that show up in listings but
give a "no such file or directory" when trying to view them), but no crash.
--
Pieter
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