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<div class="section" id="migration">
<h1>Migration<a class="headerlink" href="#migration" title="Permalink to this headline">¶</a></h1>
<p>Migrating between version control systems can be a complicated process, and
Bazaar has extensive documentation on the process at
<a class="reference external" href="http://doc.bazaar.canonical.com/migration/en">http://doc.bazaar.canonical.com/migration/en</a> and we won’t attempt to repeat that
here. We will try to give a few motivating examples for conversion from
Mercurial and Subversion.</p>
<div class="section" id="fast-import">
<h2>Fast Import<a class="headerlink" href="#fast-import" title="Permalink to this headline">¶</a></h2>
<p>In many projects wishing to use Bazaar, there is pre-existing history for the
codebase that should be taken into consideration. Bazaar leverages an
interchange format originally developed for Git called <cite>fast-import</cite> to
provide migration strategies for many other version control systems. To
work with fast-import files, Bazaar needs the <a class="reference external" href="http://launchpad.net/bzr-fastimport">fastimport</a> plugin. This can
be installed as with any Bazaar plugin.</p>
<p>The way that fast-import can be used for migration is to export the existing
history into a fast-import file, then use the <tt class="docutils literal"><span class="pre">bzr</span> <span class="pre">fast-import</span></tt> command.
The <cite>fastimport</cite> plugin includes exporters for Subversion, CVS, Git, Mercurial
and darcs, accessible as the <tt class="docutils literal"><span class="pre">fast-export-from-XXX</span></tt> commands. Note that
<tt class="docutils literal"><span class="pre">fast-import</span></tt> should not be used in a branch with existing history.</p>
<p>Assuming that ProjectX was first developed in Mercurial before switching to
Bazaar, and that the Mercurial repository is in <tt class="docutils literal"><span class="pre">/srv/hg/projectx</span></tt>, the
following commands will import that history into a newly created <tt class="docutils literal"><span class="pre">trunk</span></tt>
branch. (Recall that in <a class="reference external" href="simple-setups.html#further-configuration">Further Configuration</a> we created the
<tt class="docutils literal"><span class="pre">/srv/bzr/projectx</span></tt> directory as a shared repository.)</p>
<div class="highlight-python"><div class="highlight"><pre>$ cd /srv/bzr/projectx
$ bzr fast-export-from-hg ../../hg/projectx projectx.fi
$ bzr init trunk
$ bzr fast-import projectx.fi trunk
</pre></div>
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<div class="section" id="subversion-conversion">
<h2>Subversion Conversion<a class="headerlink" href="#subversion-conversion" title="Permalink to this headline">¶</a></h2>
<p>As the most common centralized version control system, migration from
Subversion is particularly important for any <em>new</em> version control system.
Bazaar’s <a class="reference external" href="http://launchpad.net/bzr-svn">svn</a> plugin provides tools for interaction with Subversion
projects. In fact, Bazaar can be used transparently with projects stored in
Subversion, but that is beyond the scope of this document. (See
<a class="reference external" href="http://doc.bazaar.canonical.com/migration/en/foreign/bzr-on-svn-projects.html">http://doc.bazaar.canonical.com/migration/en/foreign/bzr-on-svn-projects.html</a> for
more on that subject.) What is relevant here is the <tt class="docutils literal"><span class="pre">svn-import</span></tt> command
provided by that plugin. This can import an entire subversion repository
including tags and branches, particularly if they are stored in Subversion’s
recommended directory structure: <tt class="docutils literal"><span class="pre">/tags/</span></tt>, <tt class="docutils literal"><span class="pre">/branches/</span></tt> and <tt class="docutils literal"><span class="pre">/trunk/</span></tt>.</p>
<p>This command has flexible ways to specify what paths within the Subversion
repository contain branches and which contain tags. For example, the
recommended layout for Subversion projects (called <tt class="docutils literal"><span class="pre">trunk</span></tt> by the svn
plugin) could be specified in <tt class="docutils literal"><span class="pre">~/.bazaar/subversion.conf</span></tt> as</p>
<div class="highlight-python"><div class="highlight"><pre>[203ae883-c723-44c9-aabd-cb56e4f81c9a]
branches = branches/*
tags = tags/*
</pre></div>
</div>
<p>This allows substantially complicated Subversion repositories to be converted
into a set of separate Bazaar branches. After installing the svn plugin, see
<tt class="docutils literal"><span class="pre">bzr</span> <span class="pre">help</span> <span class="pre">svn-import</span></tt> and <tt class="docutils literal"><span class="pre">bzr</span> <span class="pre">help</span> <span class="pre">svn-layout</span></tt>.</p>
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<h3><a href="../index.html">Table Of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#">Migration</a><ul>
<li><a class="reference internal" href="#fast-import">Fast Import</a></li>
<li><a class="reference internal" href="#subversion-conversion">Subversion Conversion</a></li>
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