Revisions disappeared on branch

[Benjamin Jansen]

Hello all,

We have a bzr branch that has about 350 revisions. Yesterday, we  
noticed "bzr log" on our trunk branch now reports that it has only  
three revisions: revnos 354, 355, 356. (r354 is the cutoff, previous  
revisions don't show up.)

As far as I know, the new "first revision" was created by a user that  
used "bzr checkout" of trunk, did some work, then used "bzr commit" to  
check in. We have some people using this centralized workflow and  
others using a distributed workflow, with their own branches, merging,  
etc. I don't think this should matter, but I'm mentioning it just in  
case it does; I'm at a loss as to what happened here, so I am  
including all the details I have at this point.

Today, I created a new branch off trunk and ran "bzr check". Its  
output is below. My questions are: How can I resurrect the branch  
history? What actually caused the whole branch history to be replaced,  
and how can I prevent it from happening again?

aogail at misaki> bzr branch http://vcs.scm.tripwire.com/bzr/space/trunk/  
trunk.borked
aogail at misaki> cd trunk.borked/
aogail at misaki> bzr check
Checking working tree at 'file:///localhome/aogail/development/space/trunk.borked/' 
.
Checking repository at 'file:///localhome/aogail/development/space/'.
checked repository <bzrlib.transport.local.LocalTransport url=file:///localhome/aogail/development/space/ 
 > format <RepositoryFormatKnitPack6RichRoot>
    487 revisions
  23456 file-ids
  25753 unique file texts
9576655 repeated file texts
      0 unreferenced text versions
Checking branch at 'file:///localhome/aogail/development/space/trunk.borked/' 
.
bzr: ERROR: bzrlib.errors.BzrCheckError: Internal check failed: revno  
does not match len(mainline) 3 != 356

Traceback (most recent call last):
   File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line  
893, in run_bzr_catch_errors
     return run_bzr(argv)
   File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line  
839, in run_bzr
     ret = run(*run_argv)
   File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line  
539, in run_argv_aliases
     return self.run(**all_cmd_args)
   File "/usr/lib/python2.5/site-packages/bzrlib/builtins.py", line  
2513, in run
     check_dwim(path, verbose, do_branch=branch, do_repo=repo,  
do_tree=tree)
   File "/usr/lib/python2.5/site-packages/bzrlib/check.py", line 311,  
in check_dwim
     check_branch(branch, verbose)
   File "/usr/lib/python2.5/site-packages/bzrlib/check.py", line 266,  
in check_branch
     branch_result = branch.check()
   File "/usr/lib/python2.5/site-packages/bzrlib/decorators.py", line  
138, in read_locked
     result = unbound(self, *args, **kwargs)
   File "/usr/lib/python2.5/site-packages/bzrlib/branch.py", line 774,  
in check
     ' %s != %s' % (last_revno, len(real_rev_history)))
BzrCheckError: Internal check failed: revno does not match  
len(mainline) 3 != 356

bzr 1.10 on python 2.5.2 (linux2)
arguments: ['/usr/bin/bzr', 'check']
encoding: 'UTF-8', fsenc: 'UTF-8', lang: 'en_US.UTF-8'
plugins:
   avahi                /usr/lib/python2.5/site-packages/bzrlib/ 
plugins/avahi [0.3dev]
   bzrtools             /usr/lib/python2.5/site-packages/bzrlib/ 
plugins/bzrtools [1.10]
   dbus                 /usr/lib/python2.5/site-packages/bzrlib/ 
plugins/dbus [unknown]
   gtk                  /usr/lib/python2.5/site-packages/bzrlib/ 
plugins/gtk [0.95.0.final.1]
   launchpad            /usr/lib/python2.5/site-packages/bzrlib/ 
plugins/launchpad [unknown]
   xmloutput            /localhome/aogail/.bazaar/plugins/xmloutput  
[0.8.1]
*** Bazaar has encountered an internal error.
     Please report a bug at https://bugs.launchpad.net/bzr/+filebug
     including this traceback, and a description of what you
     were doing when the error occurred.
[4] aogail at misaki>

Thanks,
Ben Jansen
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