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<h1>Encapsulate git</h1>
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<p>Here is a solution to maintain divergent branches in git. Because it is easy to merge by mistake. I give a script that encapsulate git in order to forbid some merge and warn you some merge should be dangerous.</p>
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<h2 id="how-to-protect-against-your-own-dumb">how to protect against your own dumb</h2>
<p>I work on a project in which some of my git branches should remain divergent. And divergences should grow.</p>
<p>I also use some branch to contain what is common between projects.</p>
<p>Say I have some branches:</p>
<p>master: common to all branches dev: branch devoted to unstable development client: branch with features for all client but not general enough for master clientA: project adapted for client A clientB: project adapted for client B</p>
<p>Here how I want to work:</p>
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<img src="../../../../Scratch/img/blog/2010-03-23-Encapsulate-git/dynamic_branching.png" alt="Dynamic branching" />
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<p>And more precisely the branch hierarchy:</p>
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<img src="../../../../Scratch/img/blog/2010-03-23-Encapsulate-git/branch_hierarchy.png" alt="Branch hierarchy" />
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<p>An arrow from A to B means, you can merge A in B. If there is no arrow from A to B that means it is <em>forbidden</em> to merge A in B. Here is the corresponding rubycode:</p>
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<code class="ruby"> $architecture={ :master =&gt; [ :dev, :client ], :dev =&gt; [ :master ], :client =&gt; [ :clientA, :clientB ] } </code>
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<p>Having a <code>:master =&gt; [ :dev, :client ]</code> means you can merge <code>master</code> branch into <code>dev</code> and <code>client</code>.</p>
<p>If by mistake I make a <code>git checkout master &amp;&amp; git merge clientA</code>, I made a mistake. This is why I made a script which encapsulate the git behaviour to dodge this kind of mistake.</p>
<p>But this script do far more than that. It also merge from top to down. The action <code>allmerges</code> will do:</p>
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<code class="zsh"> git co dev &amp;&amp; git merge master git co client &amp;&amp; git merge master git co clientA &amp;&amp; git merge client git co clientB &amp;&amp; git merge client </code>
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<p>That means, I can update all branches. The algorithm will not make loop even if there is a cycle in the branch hierarchy.</p>
<p>Here it is:</p>
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<p><code class="ruby" file="eng"> #!/usr/bin/env ruby # encoding: utf-8</p>
<h1 id="architecture">architecture</h1>
<h1 id="section"></h1>
<h1 id="master---dev">master &lt;-&gt; dev</h1>
<h1 id="master---client">master -&gt; client</h1>
<h1 id="clien---clienta-clientb">clien -&gt; clientA | clientB</h1>
<h1 id="section-1"></h1>
<h1 id="merge-using-two-of-these-branches-should-be">merge using two of these branches should be</h1>
<h1 id="restricted-to-these-rules">restricted to these rules</h1>
<h1 id="merge-to-one-of-these-branch-and-an-unknown-one-should">merge to one of these branch and an unknown one should</h1>
<h1 id="raise-a-warning-and-may-the-option-to-add-this-new-branch">raise a warning, and may the option to add this new branch</h1>
<h1 id="to-the-hierarchy">to the hierarchy</h1>
<p>$architecture={ :master =&gt; [ :dev, :client ], :dev =&gt; [ :master ], :client =&gt; [ :clientA, :clientB ] }</p>
<p>def get_current_branch() (<code>git branch --no-color | awk '$1 == "*" {print $2}'</code>).chop.intern end</p>
<p>if ARGV.length == 0 puts %{usage: $0:t [git_command or local_command]</p>
<p>local commands: allmerges: merge from top to down} exit 0 end</p>
<p>require ‘set’ $known_branches=Set.new $architecture.each do |k,v| $known_branches.add(k) v.each { |b| $known_branches.add(b) } end</p>
<p>def rec_merge(branch) if $architecture[branch].nil? return end $architecture[branch].each do |b| if $flag.has_key?(b.to_s + branch.to_s) next end flagname=branch.to_s + b.to_s if $flag.has_key?(flagname) next end if system %{eng checkout #{b}} if get_current_branch != b puts “Can’t checkout to #{b}” exit 2 end if system %{eng merge #{branch}} $flag[flagname]=true rec_merge(b) else exit 1 end else exit 1 end end end</p>
<p>def do_all_merges puts ‘Will merge from father to sons’ current_branch=get_current_branch $flag={} rec_merge(:master) system %{git co #{current_branch}} end</p>
<p>def do_merge current_branch=get_current_branch src_branch=ARGV[1].intern puts %{do_merge: #{src_branch} =&gt; #{current_branch}} if $known_branches.include?(current_branch) if $known_branches.include?(src_branch) if $architecture.has_key?(src_branch) and $architecture[src_branch].include?(current_branch) system %{git merge #{src_branch}} else puts %{Forbidden merge: #{src_branch} =&gt; #{current_branch}} end else puts %{Warning! #{src_branch} not mentionned in rb configuration} sleep 2 system %{git merge #{src_branch}} puts %{Warning! #{src_branch} not mentionned in rb configuration} end end end</p>
case ARGV[0] when ‘allmerges’ then do_all_merges when ‘merge’ then do_merge else system %{git #{ARGV.join(’ ’)}} end </code>
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<p>All you need to do to make it work is simply to copy eng in a directory contained in your PATH.</p>
<p>Of course try to use as few as possible <code>cherry-pick</code> and <code>rebase</code>. This script was intended to work with workflow using <code>pull</code> and <code>merge</code>.</p>
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Published on 2010-03-23
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