On Mon, Oct 23, 2006 at 21:28:51 +0000, Samuel Bronson wrote:
> darcs get --partial --tag=2006-10-05 \
>     http://darcs.haskell.org/ghc ghc.breakitnow
> # darcs says: darcs: Couldn't read tag

I can reproduce this on my end.  For what it's worth, the error
comes from Depends.get_patches_in_tag, in the function calls

Get.go_to_chosen_version
->   Match.get_one_patchset
-> * Depends.get_patches_in_tag

If I understand correctly, to retrieve the tag 2006-10-05, darcs does a
regular darcs get and then obliterates all patches that come after that
tag. Because of that of the couldn't read tag failure, darcs does not
obliterate any patches, leaving the user with a repository that is too
far in the future.

This might be caused by some interaction between this behaviour and the
checkpoints stuff, or it might be completely unrelated.  Any ideas on
how to test this further?

Anyway, I'm not in a position to do anything about it, but thought this
bug could use a little triage/probing.