Adding upstream version 13.4.upstream/13.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+<!-- doc/src/sgml/sourcerepo.sgml -->
+
+<appendix id="sourcerepo">
+ <title>The Source Code Repository</title>
+
+ <para>
+  The <productname>PostgreSQL</productname> source code is stored and managed
+  using the <productname>Git</productname> version control system. A public
+  mirror of the master repository is available; it is updated within a minute
+  of any change to the master repository.
+ </para>
+
+ <para>
+  Our wiki, <ulink
+  url="https://wiki.postgresql.org/wiki/Working_with_Git"></ulink>,
+  has some discussion on working with Git.
+ </para>
+
+  <para>
+   Note that building <productname>PostgreSQL</productname> from the source
+   repository requires reasonably up-to-date versions of <application>bison</application>,
+   <application>flex</application>, and <application>Perl</application>. These tools are not needed
+   to build from a distribution tarball, because the files that these tools
+   are used to build are included in the tarball.  Other tool requirements
+   are the same as shown in <xref linkend="install-requirements"/>.
+  </para>
+
+ <sect1 id="git">
+  <title>Getting the Source via <productname>Git</productname></title>
+
+  <para>
+   With <productname>Git</productname> you will make a copy of the entire code repository
+   on your local machine, so you will have access to all history and branches
+   offline. This is the fastest and most flexible way to develop or test
+   patches.
+  </para>
+
+  <procedure>
+   <title>Git</title>
+
+   <step>
+    <para>
+     You will need an installed version of <productname>Git</productname>, which you can
+     get from <ulink url="https://git-scm.com"></ulink>. Many systems already
+     have a recent version of <application>Git</application> installed by default, or
+     available in their package distribution system.
+    </para>
+   </step>
+
+   <step>
+    <para>
+     To begin using the Git repository, make a clone of the official mirror:
+
+<programlisting>
+git clone https://git.postgresql.org/git/postgresql.git
+</programlisting>
+
+     This will copy the full repository to your local machine, so it may take
+     a while to complete, especially if you have a slow Internet connection.
+     The files will be placed in a new subdirectory <filename>postgresql</filename> of
+     your current directory.
+    </para>
+
+    <para>
+     The Git mirror can also be reached via the Git protocol. Just change the URL
+     prefix to <literal>git</literal>, as in:
+
+<programlisting>
+git clone git://git.postgresql.org/git/postgresql.git
+</programlisting>
+
+    </para>
+   </step>
+
+   <step>
+    <para>
+     Whenever you want to get the latest updates in the system, <command>cd</command>
+     into the repository, and run:
+
+<programlisting>
+git fetch
+</programlisting>
+    </para>
+   </step>
+  </procedure>
+
+  <para>
+   <productname>Git</productname> can do a lot more things than just fetch the source. For
+   more information, consult the <productname>Git</productname> man pages, or see the
+   website at <ulink url="https://git-scm.com"></ulink>.
+  </para>
+ </sect1>
+
+</appendix>