Bazaar Release Notes

bzr 1.17


Bazaar continues to blaze a straight and shining path to the 2.0 release and the elevation of the 2a beta format to the full glory of “supported and stable”.

Highlights in this release include greatly reduced memory consumption during commits, faster ls, faster annotate, faster network operations if you’re specifying a revision number and the final destruction of those annoying progress bar artifacts.

Changes from 1.17rc1 to 1.17final

  • Change an extension to call the python frozenset() rather than the C api PyFrozenSet_New. It turns out that python2.4 did not expose the C api. (John Arbash Meinel, #399366)
  • Fixes for the Makefile and the rename of to tools/ to allow everything to be built on Windows. (John Arbash Meinel, #399356)
  • bzr serve once again applies a ChrootServer to the given directory before serving it. (Andrew Bennetts, #400535)

Compatibility Breaks

  • bzr register-branch from the Launchpad plugin now refers to “project” instead of “product” which is the correct Launchpad terminology. The –product option is deprecated and users should switch to using –project. (Neil Martinsen-Burrell, #238764)

New Features

  • bzr push now aborts if uncommitted changes (including pending merges) are present in the working tree (if one is present) and no revision is specified. The configuration option push_strict can be used to set the default for this behavior. (Vincent Ladeuil, #284038, #322808, #65286)
  • bzr revno and bzr revision-info now have a --tree option to show revision info for the working tree instead of the branch. (Matthew Fuller, John Arbash Meinel)
  • bzr send now aborts if uncommitted changes (including pending merges) are present in the working tree and no revision is specified. The configuration option send_strict can be used to set the default for this behavior. (Vincent Ladeuil, #206577)
  • bzr switch --create-branch/-b can now be used to create and switch to a new branch. Supplying a name without a / will create the branch relative to the existing branch. (similar to how bzr switch name works when the branch already exists.) (John Arbash Meinel)

Bug Fixes

  • Accept uppercase “Y/N” to prompts such as from break lock. (#335182, Tim Powell, Martin Pool)
  • Add documentation about diverged branches and how to fix them in the centralized workflow with local commits. Mention bzr help diverged-branches when a push fails because the branches have diverged. (Neil Martinsen-Burrell, #269477)
  • Annotate would sometimes ‘latch on’ to trivial lines, causing important lines to be incorrectly annotated. (John Arbash Meinel, #387952)
  • Automatic format upgrades triggered by default stacking policies on a 1.16rc1 (or later) smart server work again. (Andrew Bennetts, #388675)
  • Avoid progress bar artifacts being left behind on the screen. (Martin Pool, #321935)
  • Better message in bzr split error suggesting a rich root format. (Neil Martinsen-Burrell, #220067)
  • Branch.set_append_revisions_only now works with branches on a smart server. (Andrew Bennetts, #365865)
  • By default, bzr branch will fail if the target directory exists, but does not already have a control directory. The flag --use-existing-dir will allow operation to proceed. (Alexander Belchenko, #307554)
  • bzr ls DIR --from-root now shows only things in DIR, not everything. (Ian Clatworthy)
  • Fetch between repositories does not error if they have inconsistent data that should be irrelevant to the fetch operation. (Aaron Bentley)
  • Fix AttributeError exception when reconfiguring lightweight checkout of a remote repository. (Jelmer Vernooij, #332194)
  • Fix bug in decoding v3 smart server messages when receiving multiple lots of excess bytes after an end-of-message. (Andrew Bennetts)
  • Force deletion of readonly files during merge, update and other tree transforms. (Craig Hewetson, Martin Pool, #218206)
  • Force socket shutdown in threaded HTTP test servers to avoid client hangs (pycurl). (Vincent Ladeuil, #383920).
  • LRUCache will maintain the linked list pointers even if a nodes cleanup function raises an exception. (John Arbash Meinel, #396838)
  • Progress bars are now suppressed again when the environment variable BZR_PROGRESS_BAR is set to none. (Martin Pool, #339385)
  • Reduced memory consumption during bzr commit of large files. For pre 2a formats, should be down to ~3x the size of a file. For --2a format repositories, it is down to the size of the file content plus the size of the compressed text. Related to bug #109114. (John Arbash Meinel)
  • Set hidden attribute on .bzr directory below unicode path should never fail with error. The operation should succeed even if bzr unable to set the attribute. (Alexander Belchenko, related to bug #335362).
  • Stacking will no longer accept requests to stack on the same branch/repository. Existing branches that incorrectly reference the same repository in a stacking configuration will now raise UnstackableLocationError when the branch is opened. This can be fixed by removing the stacking location inside .bzr/branch. (Robert Collins, #376243)
  • The log+ decorator, useful in debugging or profiling, could cause “AttributeError: ‘list’ object has no attribute ‘next’”. This is now fixed. The log decorator no longer shows the elapsed time or transfer rate because they’re available in the log prefixes and the transport activity display respectively. (Martin Pool, #340347)
  • Unshelve works correctly when multiple zero-length files are present on the shelf. (Aaron Bentley, #363444)
  • Progress bars no longer show the network transport scheme or direction. (Martin Pool)
  • launchpad-login now respects the ‘verbose’ option. (Jonathan Lange, #217031)


  • bzrlib.user_encoding is now officially deprecated. It is not possible to write a deprecation wrapper, but the variable will be removed in the near future. Use bzrlib.osutils.get_user_encoding() instead. (Alexander Belchenko)
  • Command lookup has had hooks added. bzrlib.Command.hooks has three new hook points: get_command, get_missing_command and list_commands, which allow just-in-time command name provision rather than requiring all command names be known a-priori. (Robert Collins)
  • get_app_path from now supports REG_EXPAND_SZ data type and can read path to wordpad.exe. (Alexander Belchenko, #392046)
  • graph.KnownGraph has been added. This is a class that can give answers to heads() very quickly. However, it has the assumption that the whole graph has already been loaded. This is true during annotate so it is used there with good success (as much as 2x faster for files with long ancestry and ‘cherrypicked’ changes.) (John Arbash Meinel, Vincent Ladeuil)
  • OS file locks are now taken out using CreateFile rather than LockFileEx on Windows. The locking remains exclusive with LockFileEx but now it also works on older versions of Windows (such as Win98). (Martin <gzlist>)
  • pack <=> pack fetching is now done via a PackStreamSource rather than the Packer code. The user visible change is that we now properly fetch the minimum number of texts for non-smart fetching. (John Arbash Meinel)
  • VersionedFiles._add_text is a new api that lets us insert text into the repository as a single string, rather than a list of lines. This can improve memory overhead and performance of committing large files. (Currently a private api, used only by commit). (John Arbash Meinel)


  • bzr annotate can now be significantly faster. The time for bzr annotate NEWS is down to 7s from 22s in 1.16. Files with long histories and lots of ‘duplicate insertions’ will be improved more than others. (John Arbash Meinel, Vincent Ladeuil)
  • bzr ls is now faster. On, the time drops from 2.4 to 1.1 seconds. The improvement for bzr ls -r-1 is more substantial dropping from 54.3 to 1.1 seconds. (Ian Clatworthy)
  • Improve “Path(s) are not versioned” error reporting for some commands. (Benoît PIERRE)
  • Initial commit performance in --2a repositories has been improved by making it cheaper to build the initial CHKMap. (John Arbash Meinel)
  • Resolving a revno to a revision id on a branch accessed via bzr:// or bzr+ssh:// is now much faster and involves no VFS operations. This speeds up commands like bzr pull -r 123. (Andrew Bennetts)
  • revision-info now properly aligns the revnos/revids in the output and doesn’t traceback when given revisions not in the current branch. Performance is also significantly improved when requesting multiple revs at once. (Matthew Fuller, John Arbash Meinel)
  • Tildes are no longer escaped by Transports. (Andy Kilner)


  • Avoid bad text wrapping in generated documentation. Slightly better formatting in the user reference. (Martin Pool, #249908)
  • Minor clarifications to the help for End-Of-Line conversions. (Ian Clatworthy)

API Changes

  • Removed overspecific error class InvalidProgressBarType. (Martin Pool)
  • The method ProgressView._show_transport_activity is now show_transport_activity because it’s part of the contract between this class and the UI. (Martin Pool)

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