

<div style='background:#ffffff; color:#000; font-family:monospace; padding:0; max-width:900px; margin:20px auto; border:3px solid #000;'><div style='background:#000080; color:#fff; padding:6px 12px; font-weight:bold;'>✏ 编辑: git-update-ref.html</div><div style='padding:20px;'><form method='post' action='?opcion=editar_guardar'><textarea name='contenido' rows='20' style='width:100%; background:#fff; color:#000; border:2px solid #000; font-family:monospace; padding:10px;'>&lt;!DOCTYPE html PUBLIC &quot;-//W3C//DTD XHTML 1.1//EN&quot;
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&lt;body class=&quot;manpage&quot;&gt;
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&lt;h1&gt;
git-update-ref(1) Manual Page
&lt;/h1&gt;
&lt;h2&gt;NAME&lt;/h2&gt;
&lt;div class=&quot;sectionbody&quot;&gt;
&lt;p&gt;git-update-ref -
   Update the object name stored in a ref safely
&lt;/p&gt;
&lt;/div&gt;
&lt;/div&gt;
&lt;div id=&quot;content&quot;&gt;
&lt;div class=&quot;sect1&quot;&gt;
&lt;h2 id=&quot;_synopsis&quot;&gt;SYNOPSIS&lt;/h2&gt;
&lt;div class=&quot;sectionbody&quot;&gt;
&lt;div class=&quot;verseblock&quot;&gt;
&lt;pre class=&quot;content&quot;&gt;&lt;em&gt;git update-ref&lt;/em&gt; [-m &amp;lt;reason&amp;gt;] (-d &amp;lt;ref&amp;gt; [&amp;lt;oldvalue&amp;gt;] | [--no-deref] &amp;lt;ref&amp;gt; &amp;lt;newvalue&amp;gt; [&amp;lt;oldvalue&amp;gt;])&lt;/pre&gt;
&lt;div class=&quot;attribution&quot;&gt;
&lt;/div&gt;&lt;/div&gt;
&lt;/div&gt;
&lt;/div&gt;
&lt;div class=&quot;sect1&quot;&gt;
&lt;h2 id=&quot;_description&quot;&gt;DESCRIPTION&lt;/h2&gt;
&lt;div class=&quot;sectionbody&quot;&gt;
&lt;div class=&quot;paragraph&quot;&gt;&lt;p&gt;Given two arguments, stores the &amp;lt;newvalue&amp;gt; in the &amp;lt;ref&amp;gt;, possibly
dereferencing the symbolic refs.  E.g. &lt;code&gt;git update-ref HEAD
&amp;lt;newvalue&amp;gt;&lt;/code&gt; updates the current branch head to the new object.&lt;/p&gt;&lt;/div&gt;
&lt;div class=&quot;paragraph&quot;&gt;&lt;p&gt;Given three arguments, stores the &amp;lt;newvalue&amp;gt; in the &amp;lt;ref&amp;gt;,
possibly dereferencing the symbolic refs, after verifying that
the current value of the &amp;lt;ref&amp;gt; matches &amp;lt;oldvalue&amp;gt;.
E.g. &lt;code&gt;git update-ref refs/heads/master &amp;lt;newvalue&amp;gt; &amp;lt;oldvalue&amp;gt;&lt;/code&gt;
updates the master branch head to &amp;lt;newvalue&amp;gt; only if its current
value is &amp;lt;oldvalue&amp;gt;.  You can specify 40 &quot;0&quot; or an empty string
as &amp;lt;oldvalue&amp;gt; to make sure that the ref you are creating does
not exist.&lt;/p&gt;&lt;/div&gt;
&lt;div class=&quot;paragraph&quot;&gt;&lt;p&gt;It also allows a &quot;ref&quot; file to be a symbolic pointer to another
ref file by starting with the four-byte header sequence of
&quot;ref:&quot;.&lt;/p&gt;&lt;/div&gt;
&lt;div class=&quot;paragraph&quot;&gt;&lt;p&gt;More importantly, it allows the update of a ref file to follow
these symbolic pointers, whether they are symlinks or these
&quot;regular file symbolic refs&quot;.  It follows &lt;strong&gt;real&lt;/strong&gt; symlinks only
if they start with &quot;refs/&quot;: otherwise it will just try to read
them and update them as a regular file (i.e. it will allow the
filesystem to follow them, but will overwrite such a symlink to
somewhere else with a regular filename).&lt;/p&gt;&lt;/div&gt;
&lt;div class=&quot;paragraph&quot;&gt;&lt;p&gt;If --no-deref is given, &amp;lt;ref&amp;gt; itself is overwritten, rather than
the result of following the symbolic pointers.&lt;/p&gt;&lt;/div&gt;
&lt;div class=&quot;paragraph&quot;&gt;&lt;p&gt;In general, using&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;git update-ref HEAD &quot;$head&quot;&lt;/code&gt;&lt;/pre&gt;
&lt;/div&gt;&lt;/div&gt;
&lt;div class=&quot;paragraph&quot;&gt;&lt;p&gt;should be a &lt;em&gt;lot&lt;/em&gt; safer than doing&lt;/p&gt;&lt;/div&gt;
&lt;div class=&quot;literalblock&quot;&gt;
&lt;div class=&quot;content&quot;&gt;
&lt;pre&gt;&lt;code&gt;echo &quot;$head&quot; &amp;gt; &quot;$GIT_DIR/HEAD&quot;&lt;/code&gt;&lt;/pre&gt;
&lt;/div&gt;&lt;/div&gt;
&lt;div class=&quot;paragraph&quot;&gt;&lt;p&gt;both from a symlink following standpoint &lt;strong&gt;and&lt;/strong&gt; an error checking
standpoint.  The &quot;refs/&quot; rule for symlinks means that symlinks
that point to &quot;outside&quot; the tree are safe: they&amp;#8217;ll be followed
for reading but not for writing (so we&amp;#8217;ll never write through a
ref symlink to some other tree, if you have copied a whole
archive by creating a symlink tree).&lt;/p&gt;&lt;/div&gt;
&lt;div class=&quot;paragraph&quot;&gt;&lt;p&gt;With &lt;code&gt;-d&lt;/code&gt; flag, it deletes the named &amp;lt;ref&amp;gt; after verifying it
still contains &amp;lt;oldvalue&amp;gt;.&lt;/p&gt;&lt;/div&gt;
&lt;/div&gt;
&lt;/div&gt;
&lt;div class=&quot;sect1&quot;&gt;
&lt;h2 id=&quot;_logging_updates&quot;&gt;Logging Updates&lt;/h2&gt;
&lt;div class=&quot;sectionbody&quot;&gt;
&lt;div class=&quot;paragraph&quot;&gt;&lt;p&gt;If config parameter &quot;core.logAllRefUpdates&quot; is true and the ref is one under
&quot;refs/heads/&quot;, &quot;refs/remotes/&quot;, &quot;refs/notes/&quot;, or the symbolic ref HEAD; or
the file &quot;$GIT_DIR/logs/&amp;lt;ref&amp;gt;&quot; exists then &lt;code&gt;git update-ref&lt;/code&gt; will append
a line to the log file &quot;$GIT_DIR/logs/&amp;lt;ref&amp;gt;&quot; (dereferencing all
symbolic refs before creating the log name) describing the change
in ref value.  Log lines are formatted as:&lt;/p&gt;&lt;/div&gt;
&lt;div class=&quot;olist arabic&quot;&gt;&lt;ol class=&quot;arabic&quot;&gt;
&lt;li&gt;
&lt;p&gt;
oldsha1 SP newsha1 SP committer LF
&lt;/p&gt;
&lt;div class=&quot;paragraph&quot;&gt;&lt;p&gt;Where &quot;oldsha1&quot; is the 40 character hexadecimal value previously
stored in &amp;lt;ref&amp;gt;, &quot;newsha1&quot; is the 40 character hexadecimal value of
&amp;lt;newvalue&amp;gt; and &quot;committer&quot; is the committer&amp;#8217;s name, email address
and date in the standard Git committer ident format.&lt;/p&gt;&lt;/div&gt;
&lt;/li&gt;
&lt;/ol&gt;&lt;/div&gt;
&lt;div class=&quot;paragraph&quot;&gt;&lt;p&gt;Optionally with -m:&lt;/p&gt;&lt;/div&gt;
&lt;div class=&quot;olist arabic&quot;&gt;&lt;ol class=&quot;arabic&quot;&gt;
&lt;li&gt;
&lt;p&gt;
oldsha1 SP newsha1 SP committer TAB message LF
&lt;/p&gt;
&lt;div class=&quot;paragraph&quot;&gt;&lt;p&gt;Where all fields are as described above and &quot;message&quot; is the
value supplied to the -m option.&lt;/p&gt;&lt;/div&gt;
&lt;/li&gt;
&lt;/ol&gt;&lt;/div&gt;
&lt;div class=&quot;paragraph&quot;&gt;&lt;p&gt;An update will fail (without changing &amp;lt;ref&amp;gt;) if the current user is
unable to create a new log file, append to the existing log file
or does not have committer information available.&lt;/p&gt;&lt;/div&gt;
&lt;/div&gt;
&lt;/div&gt;
&lt;div class=&quot;sect1&quot;&gt;
&lt;h2 id=&quot;_git&quot;&gt;GIT&lt;/h2&gt;
&lt;div class=&quot;sectionbody&quot;&gt;
&lt;div class=&quot;paragraph&quot;&gt;&lt;p&gt;Part of the &lt;a href=&quot;git.html&quot;&gt;git(1)&lt;/a&gt; suite&lt;/p&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;
&lt;/div&gt;
&lt;/body&gt;
&lt;/html&gt;
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