[tahoe-dev] A tahoe user's Wish List

Jody Harris imhavoc at gmail.com
Sun Jan 17 23:33:01 UTC 2010

I like that wishlist.
- Think carefully.
- Contra mundum - "Against the world" (St. Athanasius)
- Credo ut intelliga - "I believe that I may know" (St. Augustin of Hippo)

On Sun, Jan 17, 2010 at 12:23 PM, Kyle Markley <kyle at arbyte.us> wrote:

> Hello,
> Having used tahoe for a little while now, I've come up with a wish list of
> things that that would improve my user experience.  Many of these may
> already be tickets; I haven't browsed through the open tickets to look for
> things like these.  This looks like a top-ten list, but they're in no
> particular order.
> 1) I wish tahoe would save symlinks as symlinks.  Sometimes I create a
> directory full of symlinks pointing to other files, in order not to waste
> disk space on copies of the files.  If I tahoe backup such a directory and
> my hard drive crashes, I can't restore my pile of symlinks as a pile of
> symlinks.  I'll get extra copies of the files instead.
> 2) tahoe backup dies on broken symlinks.  I would prefer if it happily
> saved the broken symlink (as a symlink).
> 3) In general, tahoe stops when it encounters a serious error.  Often it
> could and should keep going.  For example:
>  - tahoe backup stops on a locked file or a broken symlink.  Don't stop!
> Just skip the one file, and tell me.
>  - tahoe deep-check --repair stops when it can't repair a file.  Don't
> stop!  Skip only what's necessary, and tell me.
>   (There's no practical way for me to resume a repair operation
> immediately "after" the bad file.)
>  - tahoe backup gives a fatal BackupProcessingError if it sees a file, but
> the file is deleted before tahoe backs it up.
> 4) Error messages should always identify what file was being worked on
> when the problem occurred.  Sometimes they do, but often they don't.
> 5) I am nervous about synchronization between backupdb.sqlite and the
> grid.  As happened recently, if a large chunk of the grid goes down, some
> files may go below their minimum number of shares.  I could repair those
> files by re-uploading them, but the backupdb assumes those files are fine.
> So those files won't be reuploaded and they'll stay broken on the grid --
> possibly forever.  I'll think they're backed up, but they aren't!  I'd like
> to have some way for a deep-check to inject a dose of reality into my
> backupdb.
> 6) For extra credit, I'd like behavior that's a hybrid between backup and
> deep-check.  Run a backup operation, but check every file as we go along,
> and repair or re-upload the file if the grid doesn't have enough shares.
> 7) I'd like to be able to pass verify caps to deep-check on the command
> line.  (I heard that this is implemented, but not for the command line.)
> 8) I'd like to have better lease control.  For example, I'd like to have
> my Latest backup live "forever" but to assign garbage collection dates to
> the earlier backups.  This would allow me to keep, say, weekly backups for
> the past month, and quarterly backups for the rest of the year.  I would
> expect to do my own scripting to make this happen.  I realize I could
> mostly get this with careful use of tahoe rm, but then my files are
> inaccessible immediately, whereas I'd rather the older backups be allowed
> to stick around until a garbage collection is run.  "You may delete these
> files at your convenience, but please keep them until you need the space."
> 9) I wish the prodgrid helper was working.  I've never been able to use it
> (not even once) since I started using tahoe.
> 10) I wish tahoe backup --exclude could accept a pathname, not just a
> filename.  (I would like to --exclude $HOME/foo/bar as a named directory,
> instead of excluding files named 'bar' wherever they may exist.)
> --
> Kyle Markley
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> tahoe-dev at allmydata.org
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