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<body class="article">
<div id="header">
<h1>ref iteration API</h1>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph"><p>Iteration of refs is done by using an iterate function which will call a
callback function for every ref. The callback function has this
signature:</p></div>
<div class="literalblock">
<div class="content">
<pre><code>int handle_one_ref(const char *refname, const unsigned char *sha1,
                   int flags, void *cb_data);</code></pre>
</div></div>
<div class="paragraph"><p>There are different kinds of iterate functions which all take a
callback of this type. The callback is then called for each found ref
until the callback returns nonzero. The returned value is then also
returned by the iterate function.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_iteration_functions">Iteration functions</h2>
<div class="sectionbody">
<div class="ulist"><ul>
<li>
<p>
<code>head_ref()</code> just iterates the head ref.
</p>
</li>
<li>
<p>
<code>for_each_ref()</code> iterates all refs.
</p>
</li>
<li>
<p>
<code>for_each_ref_in()</code> iterates all refs which have a defined prefix and
  strips that prefix from the passed variable refname.
</p>
</li>
<li>
<p>
<code>for_each_tag_ref()</code>, <code>for_each_branch_ref()</code>, <code>for_each_remote_ref()</code>,
  <code>for_each_replace_ref()</code> iterate refs from the respective area.
</p>
</li>
<li>
<p>
<code>for_each_glob_ref()</code> iterates all refs that match the specified glob
  pattern.
</p>
</li>
<li>
<p>
<code>for_each_glob_ref_in()</code> the previous and <code>for_each_ref_in()</code> combined.
</p>
</li>
<li>
<p>
<code>head_ref_submodule()</code>, <code>for_each_ref_submodule()</code>,
  <code>for_each_ref_in_submodule()</code>, <code>for_each_tag_ref_submodule()</code>,
  <code>for_each_branch_ref_submodule()</code>, <code>for_each_remote_ref_submodule()</code>
  do the same as the functions described above but for a specified
  submodule.
</p>
</li>
<li>
<p>
<code>for_each_rawref()</code> can be used to learn about broken ref and symref.
</p>
</li>
<li>
<p>
<code>for_each_reflog()</code> iterates each reflog file.
</p>
</li>
</ul></div>
</div>
</div>
<div class="sect1">
<h2 id="_submodules">Submodules</h2>
<div class="sectionbody">
<div class="paragraph"><p>If you want to iterate the refs of a submodule you first need to add the
submodules object database. You can do this by a code-snippet like
this:</p></div>
<div class="literalblock">
<div class="content">
<pre><code>const char *path = "path/to/submodule"
if (!add_submodule_odb(path))
        die("Error submodule '%s' not populated.", path);</code></pre>
</div></div>
<div class="paragraph"><p><code>add_submodule_odb()</code> will return an non-zero value on success. If you
do not do this you will get an error for each ref that it does not point
to a valid object.</p></div>
<div class="paragraph"><p>Note: As a side-effect of this you can not safely assume that all
objects you lookup are available in superproject. All submodule objects
will be available the same way as the superprojects objects.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_example">Example:</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre><code>static int handle_remote_ref(const char *refname,
                const unsigned char *sha1, int flags, void *cb_data)
{
        struct strbuf *output = cb_data;
        strbuf_addf(output, "%s\n", refname);
        return 0;
}

...

struct strbuf output = STRBUF_INIT;
        for_each_remote_ref(handle_remote_ref, &amp;output);
        printf("%s", output.buf);</code></pre>
</div></div>
</div>
</div>
</div>
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<div id="footer-text">
Last updated 2013-06-10 20:01:55 UTC
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