Bazaar Release Notes

bzr 1.7.1


No changes from 1.7.1rc1.

bzr 1.7.1rc1


This release just includes an update to how the merge algorithm handles file paths when we encounter complex history.


  • If we encounter a criss-cross in history, use information from direct Least Common Ancestors to resolve inventory shape (locations of files, adds, deletes, etc). This is similar in concept to using --lca for merging file texts, only applied to paths. (John Arbash Meinel)

bzr 1.7


This release includes many bug fixes and a few performance and feature improvements. bzr rm will now scan for missing files and remove them, like how bzr add scans for unknown files and adds them. A bit more polish has been applied to the stacking code. The b-tree indexing code has been brought in, with an eye on using it in a future repository format. There are only minor installer changes since bzr-1.7rc2.


  • Some small updates to the win32 installer. Include localization files found in plugins, and include the builtin distutils as part of packaging qbzr. (Mark Hammond)

bzr 1.7rc2


A few bug fixes from 1.7rc1. The biggest change is a new RemoteBranch.get_stacked_on_url RPC. This allows clients that are trying to access a Stacked branch over the smart protocol, to properly connect to the stacked-on location.

Bug Fixes

  • Branching from a shared repository on a smart server into a new repository now preserves the repository format. (Andrew Bennetts, #269214)
  • Branching from a stacked branch via bzr+ssh can properly connect to the stacked-on branch. (Martin Pool, #261315)
  • bzr init no longer re-opens the BzrDir multiple times. (Vincent Ladeuil)
  • Fix ‘_in_buffer’ AttributeError when using the -Dhpss debug flag. (Andrew Bennetts)

bzr 1.7rc1


This release candidate for bzr 1.7 has several bug fixes and a few performance and feature improvements. bzr rm will now scan for missing files and remove them, like how bzr add scans for unknown files and adds them. A bit more polish has been applied to the stacking code. The b-tree indexing code has been brought in, with an eye on using it in a future repository format.


  • bzr export can now export a subdirectory of a project. (Robert Collins)
  • bzr remove-tree will now refuse to remove a tree with uncommitted changes, unless the --force option is specified. (Lukáš Lalinský, #74101)
  • bzr rm will now scan for files that are missing and remove just them automatically, much as bzr add scans for new files that are not ignored and adds them automatically. (Robert Collins)


  • Support for GSSAPI authentication when using FTP as documented in RFC2228. (Jelmer Vernooij, #49623)
  • Add support for IPv6 in the smart server. (Jelmer Vernooij, #165014)


  • A URL like log+file:///tmp will log all access to that Transport to .bzr.log, which may help in debugging or profiling. (Martin Pool)
  • bzr branch and bzr push use the default stacking policy if the branch format supports it. (Aaron Bentley)
  • bzr init and bzr init-repo will now print out the same as bzr info if it completed successfully. (Marius Kruger)
  • bzr uncommit logs the old tip revision id, and displays how to restore the branch to that tip using bzr pull. This allows you to recover if you realize you uncommitted the wrong thing. (John Arbash Meinel)
  • Fix problems in accessing stacked repositories over bzr://. (Martin Pool, #261315)
  • SFTPTransport.readv() was accidentally using list += string, which ‘works’, but adds each character separately to the list, rather than using list.append(string). Fixing this makes the SFTP transport a little bit faster (~20%) and use a bit less memory. (John Arbash Meinel)
  • When reading index files, if we happen to read the whole file in a single request treat it as a _buffer_all request. This happens most often on small indexes over remote transports, where we default to reading 64kB. It saves a round trip for each small index during fetch operations. Also, if we have read more than 50% of an index file, trigger a _buffer_all on the next request. This works around some inefficiencies because reads don’t fall neatly on page boundaries, so we would ignore those bytes, but request them again later. This could trigger a total read size of more than the whole file. (John Arbash Meinel)

Bug Fixes

  • bzr rm is now aliased to bzr del for the convenience of svn users. (Robert Collins, #205416)
  • Catch the infamous “select/poll returned error” which occurs when pycurl try to send a body request to an HTTP/1.0 server which has already refused to handle the request. (Vincent Ladeuil, #225020)
  • Fix ObjectNotLocked errors when using various commands (including bzr cat and bzr annotate) in combination with a smart server URL. (Andrew Bennetts, #237067)
  • FTPTransport.stat() would return 0000 as the permission bits for the containing .bzr/ directory (it does not implement permissions). This would cause us to set all subdirectories to 0700 and files to 0600 rather than leaving them unmodified. Now we ignore 0000 as the permissions and assume they are invalid. (John Arbash Meinel, #259855)
  • Merging from a previously joined branch will no longer cause a traceback. (Jelmer Vernooij, #203376)
  • Pack operations on windows network shares will work even with large files. (Robert Collins, #255656)
  • Running bzr st PATH_TO_TREE will no longer suppress merge status. Status is also about 7% faster on mozilla sized trees when the path to the root of the tree has been given. Users of the internal show_tree_status function should be aware that the show_pending flag is now authoritative for showing pending merges, as it was originally. (Robert Collins, #255204)
  • Set valid default _param_name for Option so that ListOption can embed ‘-‘ in names. (Vincent Ladeuil, #263249)
  • Show proper error rather than traceback when an unknown revision id is specified to bzr cat-revision. (Jelmer Vernooij, #175569)
  • Trailing text in the dirstate file could cause the C dirstate parser to try to allocate an invalid amount of memory. We now properly check and test for parsing a dirstate with invalid trailing data. (John Arbash Meinel, #186014)
  • Unexpected error responses from a smart server no longer cause the client to traceback. (Andrew Bennetts, #263527)
  • Use a Windows api function to get a Unicode host name, rather than assuming the host name is ascii. (Mark Hammond, John Arbash Meinel, #256550)
  • WorkingTree4 trees will now correctly report missing-and-new paths in the output of iter_changes. (Robert Collins)


  • Updated developer documentation. (Martin Pool)

API Changes

  • Exporters now take 4 parameters. (Robert Collins)
  • Tree.iter_changes will now return False for the content change field when a file is missing in the basis tree and not present in the target tree. Previously it returned True unconditionally. (Robert Collins)
  • The deprecated Branch.abspath and unimplemented Branch.rename_one and Branch.move were removed. (Jelmer Vernooij)
  • BzrDir.clone_on_transport implementations must now accept a stacked_on parameter. (Aaron Bentley)
  • BzrDir.cloning_metadir implementations must now take a require_stacking parameter. (Aaron Bentley)


  • addCleanup now takes *arguments and **keyword_arguments which are then passed to the cleanup callable as it is run. In addition, addCleanup no longer requires that the callables passed to it be unique. (Jonathan Lange)
  • Fix some tests that fail on Windows because files are deleted while still in use. (Mark Hammond)
  • selftest‘s --starting-with option can now use predefined prefixes so that one can say bzr selftest -s bp.loom instead of bzr selftest -s bzrlib.plugins.loom. (Vincent Ladeuil)
  • selftest‘s --starting-with option now accepts multiple values. (Vincent Ladeuil)


  • A new plugin interface, bzrlib.log.log_adapters, has been added. This allows dynamic log output filtering by plugins. (Robert Collins)
  • bzrlib.btree_index is now available, providing a b-tree index layer. The design is memory conservative (limited memory cache), faster to seek (approx 100 nodes per page, gives 100-way fan out), and stores compressed pages allowing more keys per page. (Robert Collins, John Arbash Meinel)
  • bzrlib.diff.DiffTree.show_diff now skips changes where the kind is unknown in both source and target. (Robert Collins, Aaron Bentley)
  • GraphIndexBuilder.add_node and BTreeBuilder have been streamlined a bit. This should make creating large indexes faster. (In benchmarking, it now takes less time to create a BTree index than it takes to read the GraphIndex one.) (John Arbash Meinel)
  • Mail clients for bzr send are now listed in a registry. This allows plugins to add new clients by registering them with bzrlib.mail_client.mail_client_registry. All of the built-in clients now use this mechanism. (Neil Martinsen-Burrell)