Bazaar Release Notes

bzr 1.10


Bazaar 1.10 has several performance improvements for copying revisions (especially for small updates to large projects). There has also been a significant amount of effort in polishing stacked branches. The commands shelve and unshelve have become core commands, with an improved implementation.

The only changes versus bzr-1.10rc1 are bugfixes for stacked branches.

bug Fixes

  • Don’t set a pack write cache size from RepoFetcher, because the cache is not coherent with reads and causes ShortReadvErrors. This reverses the change that fixed #294479. (Martin Pool, #303856)
  • Properly handle when a revision can be inserted as a delta versus when it needs to be expanded to a fulltext for stacked branches. There was a bug involving merge revisions. As a method to help prevent future difficulties, also make stacked fetches sort topologically. (John Arbash Meinel, #304841)

bzr 1.10rc1


This release of Bazaar focuses on performance improvements when pushing and pulling revisions, both locally and to remote networks. The popular shelve and unshelve commands, used to interactively revert and restore work in progress, have been merged from bzrtools into the bzr core. There are also bug fixes for portability, and for stacked branches.

New Features

  • New commit_message_template hook that is called by the commit code to generate a template commit message. (Jelmer Vernooij)
  • New shelve and unshelve commands allow undoing and redoing changes. (Aaron Bentley)


  • (Remote)Branch.copy_content_into no longer generates the full revision history just to set the last revision info. (Andrew Bennetts, John Arbash Meinel)
  • Fetches between formats with different serializers (such as pack-0.92-subtree and 1.9-rich-root) are faster now. This is due to operating on batches of 100 revisions at time rather than one-by-one. (Andrew Bennetts, John Arbash Meinel)
  • Search index files corresponding to pack files we’ve already used before searching others, because they are more likely to have the keys we’re looking for. This reduces the number of iix and tix files accessed when pushing 1 new revision, for instance. (John Arbash Meinel)
  • Signatures to transfer are calculated more efficiently in item_keys_introduced_by. (Andrew Bennetts, John Arbash Meinel)
  • The generic fetch code can once again copy revisions and signatures without extracting them completely to fulltexts and then serializing them back down into byte strings. This is a significant performance improvement when fetching from a stacked branch. (John Arbash Meinel, #300289)
  • When making a large readv() request over bzr+ssh, break up the request into more manageable chunks. Because the RPC is not yet able to stream, this helps keep us from buffering too much information at once. (John Arbash Meinel)

Bug Fixes

  • Better message when the user needs to set their Launchpad ID. (Martin Pool, #289148)
  • bzr commit --local doesn’t access the master branch anymore. This fixes a regression introduced in 1.9. (Marius Kruger, #299313)
  • Don’t call the system chdir() with an empty path. Sun OS seems to give an error in that case. Also, don’t count on getcwd() being able to allocate a new buffer, which is a gnu extension. (John Arbash Meinel, Martin Pool, Harry Hirsch, #297831)
  • Don’t crash when requesting log –forward <file> for a revision range starting with a dotted revno. (Vincent Ladeuil, #300055)
  • Don’t create text deltas spanning stacked repositories; this could cause “Revision X not present in Y” when later accessing them. (Martin Pool, #288751)
  • Pack repositories are now able to reload the pack listing and retry the current operation if another action causes the data to be repacked. (John Arbash Meinel, #153786)
  • PermissionDenied errors from smart servers no longer cause “PermissionDenied: “None”” on the client. (Andrew Bennetts, #299254)
  • Pushing to a stacked pack repository now batches writes, the same way writes are batched to ordinary pack repository. This makes pushing to a stacked branch over the network much faster. (Andrew Bennetts, #294479)
  • TooManyConcurrentRequests no longer occur when a fetch fails and tries to abort a write group. This allows the root cause (e.g. a network interruption) to be reported. (Andrew Bennetts, #297014)
  • RemoteRepository.get_parent_map now uses fallback repositories. (Aaron Bentley, #297991?, #293679?)

API Changes

  • CommitBuilder now validates the strings it will be committing, to ensure that they do not have characters that will not be properly round-tripped. For now, it just checks for characters that are invalid in the XML form. (John Arbash Meinel, #295161)
  • Constructor parameters for NewPack (internal to pack repositories) have changed incompatibly.
  • Repository.abort_write_group now accepts an optional suppress_errors flag. Repository implementations that override abort_write_group will need to be updated to accept the new argument. Subclasses that only override _abort_write_group don’t need to change.
  • Transport implementations must provide copy_tree_to_transport. A default implementation is provided for Transport subclasses.


  • bzr selftest now fails if no doctests are found in a module that’s expected to have them. (Martin Pool)
  • Doctests now only report the first failure. (Martin Pool)

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