[Bug 1075108] Re: bzr branch fails on a ssh mount of remote ext4 fs with Error 95 Operation Not Supported

[Launchpad Bug Tracker]

** Branch linked: lp:~jameinel/bzr/2.4-fdatasync-ENOTSUP-1075108

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Title:
  bzr branch fails on a ssh mount of remote ext4 fs with Error 95
  Operation Not Supported

Status in Bazaar Version Control System:
  Confirmed
Status in Bazaar 2.5 series:
  Confirmed
Status in Bazaar 2.6 series:
  Confirmed
Status in “bzr” package in Ubuntu:
  Confirmed

Bug description:
  I'm using a VM, running 12.10, upgraded from 12.04.1 (server). Using a
  bzr checkout dir on the VM and mounting that locally on the host with
  SSH from /home/USER/.gvfs/home/VMUSER/work/maas, symlinked to
  /home/USER/work/maas, then running bzr branch --switch on the host,
  while in the symlink dir. I get an Error 95 Operation not supported.
  And looking at the traceback in the log, it seems the fs reports
  erroneously supporting fdatasync, but actually fails later when bzr
  tries to do it.

  Running the same command on the VM locally works.

  Traceback (most recent call last):
    File ".../bzrlib/commands.py", line 920, in exception_to_return_code
      return the_callable(*args, **kwargs)
    File ".../bzrlib/commands.py", line 1131, in run_bzr
      ret = run(*run_argv)
    File ".../bzrlib/commands.py", line 673, in run_argv_aliases
      return self.run(**all_cmd_args)
    File ".../bzrlib/commands.py", line 695, in run
      return self._operation.run_simple(*args, **kwargs)
    File ".../bzrlib/cleanup.py", line 136, in run_simple
      self.cleanups, self.func, *args, **kwargs)
    File ".../bzrlib/cleanup.py", line 166, in _do_with_cleanups
      result = func(*args, **kwargs)
    File ".../bzrlib/builtins.py", line 1493, in run
      source_branch=br_from)
    File ".../bzrlib/bzrdir.py", line 366, in sprout
      create_tree_if_local=create_tree_if_local)
    File ".../bzrlib/cleanup.py", line 132, in run
      self.cleanups, self.func, self, *args, **kwargs)
    File ".../bzrlib/cleanup.py", line 166, in _do_with_cleanups
      result = func(*args, **kwargs)
    File ".../bzrlib/bzrdir.py", line 416, in _sprout
      result_repo.fetch(source_repository, fetch_spec=fetch_spec)
    File ".../bzrlib/vf_repository.py", line 1267, in fetch
      find_ghosts=find_ghosts, fetch_spec=fetch_spec)
    File ".../bzrlib/decorators.py", line 218, in write_locked
      result = unbound(self, *args, **kwargs)
    File ".../bzrlib/vf_repository.py", line 2584, in fetch
      find_ghosts=find_ghosts)
    File ".../bzrlib/fetch.py", line 77, in __init__
      self.__fetch()
    File ".../bzrlib/fetch.py", line 104, in __fetch
      self._fetch_everything_for_search(search_result)
    File ".../bzrlib/fetch.py", line 132, in _fetch_everything_for_search
      stream, from_format, [])
    File ".../bzrlib/vf_repository.py", line 2050, in insert_stream
      hint = self.target_repo.commit_write_group()
    File ".../bzrlib/repository.py", line 633, in commit_write_group
      result = self._commit_write_group()
    File ".../bzrlib/repofmt/pack_repo.py", line 1727, in _commit_write_group
      hint = self._pack_collection._commit_write_group()
    File ".../bzrlib/repofmt/pack_repo.py", line 1612, in _commit_write_group
      self._new_pack.finish()
    File ".../bzrlib/repofmt/pack_repo.py", line 496, in finish
      want_fdatasync=self._pack_collection.config_stack.get('repository.fdatasync'))
    File ".../bzrlib/transport/__init__.py", line 237, in close
      self.fdatasync()
    File ".../bzrlib/transport/__init__.py", line 268, in fdatasync
      self.file_handle.flush()
  IOError: [Errno 95] Operation not supported

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: bzr 2.5.1-0ubuntu2
  ProcVersionSignature: Ubuntu 3.2.0-32.51-generic 3.2.30
  Uname: Linux 3.2.0-32-generic x86_64
  NonfreeKernelModules: fglrx
  ApportVersion: 2.0.1-0ubuntu14
  Architecture: amd64
  Date: Mon Nov  5 11:16:01 2012
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  PackageArchitecture: all
  SourcePackage: bzr
  UpgradeStatus: Upgraded to precise on 2012-05-03 (186 days ago)

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