5 This directory contains a simple plugin that adds
6 Subversion (http://subversion.tigris.org/) branch support to
7 Bazaar (http://www.bazaar-vcs.org/). This allows ``bzr branch``, ``bzr push``,
8 ``bzr pull``, and ``bzr co`` to work directly against Subversion repositories.
10 The plugin can at the moment be used to commit to, pull from, merge from, push
11 to and view logs of Subversion branches from Bazaar.
17 You will need at least version 0.90 of Bazaar or higher.
19 You also need a fairly recent version of the Python bindings to the
20 Subversion libraries. At the moment, the svn plugin only works with
21 Subversion 1.5 (trunk). The python-subversion package in Ubuntu Feisty and
22 Gutsy and Debian Etch, Lenny and Sid also contain the required changes.
24 If you are running an older version of Python (under 2.5), you will also
25 need to have the pysqlite package installed.
27 In order to be able to use the ``svn-upgrade`` command (for those
28 who used earlier versions of bzr-svn), you will need the bzr-rebase
29 plugin (http://bazaar-vcs.org/BzrSvn).
35 The following features are currently present:
37 - Connecting to remote Subversion repositories over all
38 protocols supported by Subversion itself (at present:
39 svn://, svn+ssh://, http:// (webdav), file://)
40 as well as dump files.
42 Checkouts, lightweight checkouts and branching works.
44 - Track Bazaar merges in Subversion. Merged revisions show up
47 - Subversion working copies. Can be modified, queried
48 ('bzr status' on a vanilla working copied created with
49 'svn co' works) and committed from.
51 - Committing to Subversion from Bazaar.
53 - Push Bazaar revisions to Subversion.
55 - Follow branch copies. Revision history is not
56 truncated when a branch was copied in Subversion.
58 - Efficiently uses network bandwidth.
60 - Recognizes file metadata (executable bits, symlinks).
62 - 'svn-import' command with functionality similar to svn2bzr.
64 - Ability to track merges done with SVK (http://svk.elixus.org/)
67 - Generates consistent file ids and revision ids. Two branches made using
68 this plugin of the same Subversion branch will result in *exactly* the same
71 - Handles complex operations in Subversion: committing to two branches at
72 once, upgrading directories to branches, copies from early revisions, ...
78 In the future, I also hope to support:
80 - Renames. Initial work has been done to support this,
81 but the number of corner cases is wide, so support for this
82 has not been enabled by default yet.
84 - Better performance. Network-wise (both bandwidth and roundtrips), the plugin
85 is in good shape. However, it is currently quite CPU-intensive for no good
86 reason and I hope to make a couple of improvements in that area.
88 - Override implementation of get_revision_delta(). Will speed up 'bzr log -v'
90 - use svn_ra_replay() on systems that have Subversion 1.4. Saves a couple of
91 roundtrips when fetching history.
93 - implement svn_ra_get_dir_revs() in Subversion to fetch the properties set on
94 a specific directory all at once.
96 Some Subversion properties can currently not be represented in Bazaar
97 and are therefore ignored for the time being:
99 - 'svn:ignore' is not imported. There should be a
100 'Repository.get_ignores(revid)' call in Bazaar rather than a magic
103 - 'svn:externals'. Externals should be mapped to Bazaar 'by-reference'
104 nested branches and the other way around. This can't be implemented
105 this until Bazaars nested branch support lands. AaronBentley's work
106 in progress is at http://code.aaronbentley.com/bzr/bzrrepo/nested-trees/.
107 This has been delayed until after 0.9 because of required repository
114 - 'svn:keywords'. Requires keywords support in Bazaar. Spec at
115 https://launchpad.net/products/bzr/+spec/bzr-keyword-expansion
117 Other features currently held back by Bazaars feature set:
119 - Horizon revision history. Most of the existing Subversion repositories
120 are quite large and it would therefore be nice to be able to limit
121 the amount of history that needs to be retrieved during checkouts.
123 Spec at https://launchpad.net/products/bzr/+spec/shallow-checkouts
127 Spec at https://launchpad.net/products/bzr/+spec/filecopies
129 Features held back by Subversion:
131 - Showing SVN merges as merges in Bazaar. This requires full merge tracking
132 information in Subversion, something which the Subversion folks are working
133 on at the moment (see https://svn.collab.net/repos/svn/branches/merge-tracking).
135 Might require cherry-picking support in Bazaar (or at least the ability
136 to know about cherry picks).
138 Spec at https://launchpad.net/products/bzr/+spec/bzr-cpick-data
144 Please file bug reports in launchpad. The product URL for bzr-svn is
145 https://launchpad.net/products/bzr-svn/. The wiki for this
146 plugin is at http://bazaar-vcs.org/BzrSvn.
152 Simply place this directory in ~/.bazaar/plugins and you should be able
153 to check out branches from Subversion using bzr. Make sure the directory
159 bzr-svn can use a lot of memory cloning big branches. The problem appears to be
160 caused both by a memory leak in the python-subversion bindings or Subversion
161 (the svn_ra_get_log() function) and the memory overhead from Bazaar.
163 The easiest way to work around this problem is to Ctrl+C the branch operation
166 More information can be found in the bug report at
167 https://launchpad.net/bugs/54253