[Bug 863368] Re: bzr crashed with ValueError in set_root_id(): WorkingTree.set_root_id with fileid=None

[Martin Pool]

*** This bug is a duplicate of bug 242175 ***
    https://bugs.launchpad.net/bugs/242175

** This bug is no longer a duplicate of bug 733789
   bzr crashed with ValueError in set_root_id()
** This bug has been marked a duplicate of bug 242175
   ValueError: WorkingTree.set_root_id with fileid=None when merging into empty branch

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https://bugs.launchpad.net/bugs/863368

Title:
  bzr crashed with ValueError in set_root_id(): WorkingTree.set_root_id
  with fileid=None

Status in “bzr” package in Ubuntu:
  New

Bug description:
  I was playing with bzr, to know how it works... performing some testing...
  Sequence of commands:

  # Make a branch of the trunk of remote location (the repo is empty)
  bzr branch bzr+ssh://myremotelocation/trunk

  # Make a local branch to perform my fist commit
  bzr branch trunk myfirstcommit

  # Do a commit on my local branch
  cd myfirstcommit
  touch MYFIRSTFILE.txt
  bzr add MYFISTFILE.txt
  bzr commit -m "This is my first commit on"

  #Merge the first commit on the trunk
  cd ../trunk
  bzr merge ../myfirstcommit

  #Until here everything OK. Now I wanted to know the status 
  bzr status and I got:

  "working tree is out of date, run 'bzr update'"
  "renamed:"
   "  README => README"

  #so, I ran bzr update and I got the exception.

  ProblemType: Crash
  DistroRelease: Ubuntu 11.04
  Package: bzr 2.3.4-0ubuntu1
  ProcVersionSignature: Ubuntu 2.6.38-11.50-generic 2.6.38.8
  Uname: Linux 2.6.38-11-generic x86_64
  NonfreeKernelModules: nvidia wl
  Architecture: amd64
  BzrDebugFlags: set()
  BzrVersion: 2.3.4
  CommandLine: ['/usr/bin/bzr', 'update']
  CrashDb: bzr
  Date: Fri Sep 30 10:55:14 2011
  ExecutablePath: /usr/bin/bzr
  FileSystemEncoding: UTF-8
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64 (20110302)
  InterpreterPath: /usr/bin/python2.7
  Locale: en_US.UTF-8
  PackageArchitecture: all
  Platform: Linux-2.6.38-11-generic-x86_64-with-Ubuntu-11.04-natty
  ProcCmdline: /usr/bin/python /usr/bin/bzr update
  ProcEnviron:
   SHELL=/bin/bash
   PATH=(custom, user)
   LANG=en_US.UTF-8
   LANGUAGE=en_US:en
  PythonVersion: 2.7.1
  SourcePackage: bzr
  Title: bzr crashed with ValueError in set_root_id(): WorkingTree.set_root_id with fileid=None
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserEncoding: UTF-8
  UserGroups: adm admin audio cdrom dialout dip fax floppy fuse lpadmin netdev nopasswdlogin plugdev sambashare tape vboxusers video

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