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&lt;title&gt;ref iteration API&lt;/title&gt;
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&lt;body class=&quot;article&quot;&gt;
&lt;div id=&quot;header&quot;&gt;
&lt;h1&gt;ref iteration API&lt;/h1&gt;
&lt;/div&gt;
&lt;div id=&quot;content&quot;&gt;
&lt;div id=&quot;preamble&quot;&gt;
&lt;div class=&quot;sectionbody&quot;&gt;
&lt;div class=&quot;paragraph&quot;&gt;&lt;p&gt;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:&lt;/p&gt;&lt;/div&gt;
&lt;div class=&quot;literalblock&quot;&gt;
&lt;div class=&quot;content&quot;&gt;
&lt;pre&gt;&lt;code&gt;int handle_one_ref(const char *refname, const unsigned char *sha1,
                   int flags, void *cb_data);&lt;/code&gt;&lt;/pre&gt;
&lt;/div&gt;&lt;/div&gt;
&lt;div class=&quot;paragraph&quot;&gt;&lt;p&gt;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.&lt;/p&gt;&lt;/div&gt;
&lt;/div&gt;
&lt;/div&gt;
&lt;div class=&quot;sect1&quot;&gt;
&lt;h2 id=&quot;_iteration_functions&quot;&gt;Iteration functions&lt;/h2&gt;
&lt;div class=&quot;sectionbody&quot;&gt;
&lt;div class=&quot;ulist&quot;&gt;&lt;ul&gt;
&lt;li&gt;
&lt;p&gt;
&lt;code&gt;head_ref()&lt;/code&gt; just iterates the head ref.
&lt;/p&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;p&gt;
&lt;code&gt;for_each_ref()&lt;/code&gt; iterates all refs.
&lt;/p&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;p&gt;
&lt;code&gt;for_each_ref_in()&lt;/code&gt; iterates all refs which have a defined prefix and
  strips that prefix from the passed variable refname.
&lt;/p&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;p&gt;
&lt;code&gt;for_each_tag_ref()&lt;/code&gt;, &lt;code&gt;for_each_branch_ref()&lt;/code&gt;, &lt;code&gt;for_each_remote_ref()&lt;/code&gt;,
  &lt;code&gt;for_each_replace_ref()&lt;/code&gt; iterate refs from the respective area.
&lt;/p&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;p&gt;
&lt;code&gt;for_each_glob_ref()&lt;/code&gt; iterates all refs that match the specified glob
  pattern.
&lt;/p&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;p&gt;
&lt;code&gt;for_each_glob_ref_in()&lt;/code&gt; the previous and &lt;code&gt;for_each_ref_in()&lt;/code&gt; combined.
&lt;/p&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;p&gt;
&lt;code&gt;head_ref_submodule()&lt;/code&gt;, &lt;code&gt;for_each_ref_submodule()&lt;/code&gt;,
  &lt;code&gt;for_each_ref_in_submodule()&lt;/code&gt;, &lt;code&gt;for_each_tag_ref_submodule()&lt;/code&gt;,
  &lt;code&gt;for_each_branch_ref_submodule()&lt;/code&gt;, &lt;code&gt;for_each_remote_ref_submodule()&lt;/code&gt;
  do the same as the functions described above but for a specified
  submodule.
&lt;/p&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;p&gt;
&lt;code&gt;for_each_rawref()&lt;/code&gt; can be used to learn about broken ref and symref.
&lt;/p&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;p&gt;
&lt;code&gt;for_each_reflog()&lt;/code&gt; iterates each reflog file.
&lt;/p&gt;
&lt;/li&gt;
&lt;/ul&gt;&lt;/div&gt;
&lt;/div&gt;
&lt;/div&gt;
&lt;div class=&quot;sect1&quot;&gt;
&lt;h2 id=&quot;_submodules&quot;&gt;Submodules&lt;/h2&gt;
&lt;div class=&quot;sectionbody&quot;&gt;
&lt;div class=&quot;paragraph&quot;&gt;&lt;p&gt;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:&lt;/p&gt;&lt;/div&gt;
&lt;div class=&quot;literalblock&quot;&gt;
&lt;div class=&quot;content&quot;&gt;
&lt;pre&gt;&lt;code&gt;const char *path = &quot;path/to/submodule&quot;
if (!add_submodule_odb(path))
        die(&quot;Error submodule '%s' not populated.&quot;, path);&lt;/code&gt;&lt;/pre&gt;
&lt;/div&gt;&lt;/div&gt;
&lt;div class=&quot;paragraph&quot;&gt;&lt;p&gt;&lt;code&gt;add_submodule_odb()&lt;/code&gt; 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.&lt;/p&gt;&lt;/div&gt;
&lt;div class=&quot;paragraph&quot;&gt;&lt;p&gt;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.&lt;/p&gt;&lt;/div&gt;
&lt;/div&gt;
&lt;/div&gt;
&lt;div class=&quot;sect1&quot;&gt;
&lt;h2 id=&quot;_example&quot;&gt;Example:&lt;/h2&gt;
&lt;div class=&quot;sectionbody&quot;&gt;
&lt;div class=&quot;listingblock&quot;&gt;
&lt;div class=&quot;content&quot;&gt;
&lt;pre&gt;&lt;code&gt;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, &quot;%s\n&quot;, refname);
        return 0;
}

...

        struct strbuf output = STRBUF_INIT;
        for_each_remote_ref(handle_remote_ref, &amp;amp;output);
        printf(&quot;%s&quot;, output.buf);&lt;/code&gt;&lt;/pre&gt;
&lt;/div&gt;&lt;/div&gt;
&lt;/div&gt;
&lt;/div&gt;
&lt;/div&gt;
&lt;div id=&quot;footnotes&quot;&gt;&lt;hr /&gt;&lt;/div&gt;
&lt;div id=&quot;footer&quot;&gt;
&lt;div id=&quot;footer-text&quot;&gt;
Last updated 2013-06-10 20:01:55 UTC
&lt;/div&gt;
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