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<a name="Quality-Assurance"></a>
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<p>
Next: <a href="Vars.html#Vars" accesskey="n" rel="next">Vars</a>, Previous: <a href="Workspace-Collisions.html#Workspace-Collisions" accesskey="p" rel="prev">Workspace Collisions</a>, Up: <a href="Advanced-Uses.html#Advanced-Uses" accesskey="u" rel="up">Advanced Uses</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="General-Index.html#General-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
<a name="Quality-Assurance-1"></a>
<h3 class="section">3.8 Quality Assurance</h3>

<p>Monotone was constructed to serve both as a version control tool and
as a quality assurance tool. The quality assurance features permit
users to ignore, or &ldquo;filter out&rdquo;, versions which do not meet their
criteria for quality. This section describes the way monotone
represents and reasons about quality information.
</p>
<p>Monotone often views the collection of revisions as a directed graph,
in which revisions are the nodes and changes between revisions are the
edges. We call this the <em>revision graph</em>. The revision graph has a
number of important subgraphs, many of which overlap. For example,
each branch is a subgraph of the revision graph, containing only the
nodes carrying a particular <code>branch</code> cert.
</p>
<p>Many of monotone&rsquo;s operations involve searching the revision graph for
the ancestors or descendants of a particular revision, or extracting
the &ldquo;heads&rdquo; of a subgraph, which is the subgraph&rsquo;s set of nodes with
no descendants. For example, when you run the <code>update</code> command,
monotone searches the subgraph consisting of descendants of the base
revision of the current workspace, trying to locate a unique head to
update the base revision to.
</p>
<p>Monotone&rsquo;s quality assurance mechanisms are mostly based on
restricting the subgraph each command operates on. There are two
methods used to restrict the subgraph:
</p>
<ul>
<li> By restricting the set of trusted <code>branch</code> certificates, you
can require that specific code reviewers have approved of each edge in
the subgraph you focus on.
</li><li> By restricting the set of trusted <code>testresult</code> certificates, you
can require that the <em>endpoints</em> of an update operation have a
certificate asserting that the revision in question passed a certain
test, or testsuite.
</li></ul>

<p>The evaluation of trust is done on a cert-by-cert basis by calling the
Lua hook <a href="Trust-Evaluation-Hooks.html#get_005frevision_005fcert_005ftrust">get_revision_cert_trust</a>.  This hook is only called
when a cert has at least one good signature from a known key, and are
passed <em>all</em> the keys which have signed the cert, as well as the
cert&rsquo;s ID, name and value. The hook can then evaluate the set of
signers, as a group, and decide whether to grant or deny trust to the
assertion made by the cert.
</p>
<p>The evaluation of testresults is controlled by the
<code>accept_testresult_change</code> hook (see <a href="Trust-Evaluation-Hooks.html#accept_005ftestresult_005fchange">accept_testresult_change</a>).
This hook is called when
selecting update candidates, and is passed a pair of tables describing
the <code>testresult</code> certs present on the source and proposed
destination of an update. Only if the change in test results are
deemed &ldquo;acceptable&rdquo; does monotone actually select an update target
to merge into your workspace.
</p>
<hr>
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<p>
Next: <a href="Vars.html#Vars" accesskey="n" rel="next">Vars</a>, Previous: <a href="Workspace-Collisions.html#Workspace-Collisions" accesskey="p" rel="prev">Workspace Collisions</a>, Up: <a href="Advanced-Uses.html#Advanced-Uses" accesskey="u" rel="up">Advanced Uses</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="General-Index.html#General-Index" title="Index" rel="index">Index</a>]</p>
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