glfs/general/prog/git.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
   "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
  <!ENTITY % general-entities SYSTEM "../../general.ent">
  %general-entities;

  <!ENTITY git-root "&kernel-dl;/software/scm/git" >

  <!ENTITY git-download-http "&git-root;/git-&git-version;.tar.xz">
  <!ENTITY git-download-ftp  " ">
  <!ENTITY git-md5sum        "f2a5667597dc233e210ad66e4ed13906">

  <!ENTITY git-size          "7.1 MB">
  <!-- but people keep forgetting that an install not only needs the net build
       space, it also needs the install space (or DESTDIR) -->
  <!ENTITY git-buildsize     "256 MB (with downloaded documentation; add 18 MB for building doc)">
  <!-- With 2.23.0, there was a large increase in time for tests. Possibly disk related? -->
  <!-- Confirmed that it is disk related.-->
  <!ENTITY git-time          "0.3 SBU (with parallelism=4; add 0.4 SBU for building doc, and up to 13 SBU (disk speed dependent) for tests)">
]>

<sect1 id="git" xreflabel="git-&git-version;">
  <?dbhtml filename="git.html"?>


  <title>Git-&git-version;</title>

  <indexterm zone="git">
    <primary sortas="a-Git">Git</primary>
  </indexterm>

  <sect2 role="package">
    <title>Introduction to Git</title>

    <para>
      <application>Git</application> is a free and open source, distributed
      version control system designed to handle everything from small to very
      large projects with speed and efficiency. Every
      <application>Git</application> clone is a full-fledged repository with
      complete history and full revision tracking capabilities, not dependent
      on network access or a central server. Branching and merging are fast and
      easy to do. <application>Git</application> is used for version control of
      files, much like tools such as <xref linkend="mercurial"/>,
      <application>Bazaar</application>, <xref linkend="subversion"/>,
      <ulink url="https://www.nongnu.org/cvs/">CVS</ulink>,
      <application>Perforce</application>, and
      <application>Team Foundation Server</application>.
    </para>

    &lfs120_checked;

    <bridgehead renderas="sect3">Package Information</bridgehead>
    <itemizedlist spacing="compact">
      <listitem>
        <para>
          Download (HTTP): <ulink url="&git-download-http;"/>
        </para>
      </listitem>
      <listitem>
        <para>
          Download (FTP): <ulink url="&git-download-ftp;"/>
        </para>
      </listitem>
      <listitem>
        <para>
          Download MD5 sum: &git-md5sum;
        </para>
      </listitem>
      <listitem>
        <para>
          Download size: &git-size;
        </para>
      </listitem>
      <listitem>
        <para>
          Estimated disk space required: &git-buildsize;
        </para>
      </listitem>
      <listitem>
        <para>
          Estimated build time: &git-time;
        </para>
      </listitem>
    </itemizedlist>

    <bridgehead renderas="sect3">Additional Downloads</bridgehead>
    <itemizedlist spacing="compact">
      <listitem>
        <para>
          <ulink url="&git-root;/git-manpages-&git-version;.tar.xz">
          &git-root;/git-manpages-&git-version;.tar.xz</ulink>
          (not needed if you've installed <xref linkend="asciidoc"/>,
          <xref linkend="xmlto"/>, and prefer to rebuild them)
        </para>
      </listitem>
      <listitem>
        <para>
          <ulink url="&git-root;/git-htmldocs-&git-version;.tar.xz">
          &git-root;/git-htmldocs-&git-version;.tar.xz</ulink>
          and other docs (not needed if you've installed
          <xref linkend="asciidoc"/> and want to rebuild the documentation).
        </para>
      </listitem>
    </itemizedlist>

    <bridgehead renderas="sect3">Git Dependencies</bridgehead>

    <bridgehead renderas="sect4">Recommended</bridgehead>
    <para role="recommended">
      <xref linkend="curl"/> (needed to use <application>Git</application> over
      http, https, ftp or ftps)
    </para>

    <bridgehead renderas="sect4">Optional</bridgehead>
    <para role="optional">
      <xref linkend="apache"/> (for some tests),
      <xref role='runtime' linkend='fcron'/> (runtime, for scheduling
      <command>git maintenance</command> jobs),
      <xref role="runtime" linkend="gnupg2"/> (runtime, may be used to sign
      <application>Git</application> commits or tags, or verify the signatures
      of them),
      <xref role="runtime" linkend="openssh"/> (runtime, needed to use
      <application>Git</application> over ssh),
      <xref linkend="pcre2"/> (<emphasis>or</emphasis> the deprecated <xref
      role="nodep" linkend="pcre"/>), in either case configured with
      <literal>--enable-jit</literal>,
      <xref role="runtime" linkend="subversion"/> with Perl bindings
         (runtime, for <command>git svn</command>),
      <xref role="runtime" linkend="tk"/>
      (gitk, a simple <application>Git</application>
      repository viewer, uses <application>Tk</application> at runtime),
      <xref linkend="valgrind"/>,
      <ulink url="https://metacpan.org/pod/Authen::SASL">Authen::SASL</ulink> and
      <ulink url="https://metacpan.org/pod/MIME::Base64">MIME::Base64</ulink>
      (both runtime, for <command>git send-email</command>),
      <phrase revision='sysv'>and </phrase><xref
      linkend='perl-io-socket-ssl'/> (runtime, for
      <command>git send-email</command> to connect to a SMTP server with
      SSL encryption)
      <phrase revision='systemd'>,and <xref role='runtime' linkend='systemd'/>
      (runtime, rebuilt with <xref role='nodep' linkend='linux-pam'/>, for
      scheduling <command>git maintenance</command> jobs)</phrase>
    </para>

    <bridgehead renderas="sect4">Optional (to create the man pages, html docs
    and other docs)</bridgehead>
    <para role="optional">
      <xref linkend="xmlto"/> and
      <xref linkend="asciidoc"/>
      <!-- or xref linkend="asciidoctor", doesn't work now because it needs docbook-xsl-ns -->,
      and also
      <ulink url="https://dblatex.sourceforge.net/">dblatex</ulink>
      (for the PDF version of the user manual), and
      <ulink url="https://docbook2x.sourceforge.net/">docbook2x</ulink> to
      create info pages
    </para>

  </sect2>

  <sect2 role="installation">
    <title>Installation of Git</title>

    <para>
      Install <application>Git</application> by running the following
      commands:
    </para>

<screen><userinput>./configure --prefix=/usr \
            --with-gitconfig=/etc/gitconfig \
            --with-python=python3 &amp;&amp;
make</userinput></screen>

    <para>
      You can build the man pages and/or html docs, or
      use downloaded ones. If you choose to build them, use the next two
      instructions.
    </para>

    <para>
      If you have installed <xref linkend="asciidoc"/> you can
      create the html version of the man pages and other docs:
    </para>

<screen remap="doc"><userinput>make html</userinput></screen>

    <para>
      If you have installed <xref linkend="asciidoc"/>  and
      <xref linkend="xmlto"/> you can create the man pages:
    </para>

<screen remap="doc"><userinput>make man</userinput></screen>

    <para>
      The test suite can be run in parallel mode. To run the test suite, issue:
      <command>make test -k |&amp; tee test.log</command>.  If some test
      fails, the list of failed tests can be shown via
      <command>grep '^not ok' test.log | grep -v TODO</command>.
      <!-- It looks like I'd misdiagnosed the issue.  -->
      <!--phrase revision='systemd'>One test named <literal>start and stop
      Linux/systemd maintenance</literal> is known to fail if the current
      login session is not started after rebuilding
      <xref linkend='systemd'/> with <xref linkend='linux-pam'/>
      support, or it's a SSH session but the SSH server is not configured
      with <option>UsePAM</option> enabled.</phrase-->
    </para>

    <para>
      Now, as the <systemitem class="username">root</systemitem>
      user:
    </para>

<screen role="root"><userinput>make perllibdir=/usr/lib/perl5/&lfs-perl-version;/site_perl install</userinput></screen>

<!-- ==== Method 1 for docs ====== -->
    <bridgehead renderas="sect3">If you created the man pages and/or html docs</bridgehead>

    <para>
      Install the man pages as the
      <systemitem class="username">root</systemitem> user:
    </para>

<screen role="root"
        remap="doc"><userinput>make install-man</userinput></screen>

    <para>
      Install the html docs as the
      <systemitem class="username">root</systemitem> user:
    </para>

<screen role="root"
        remap="doc"><userinput>make htmldir=/usr/share/doc/git-&git-version; install-html</userinput></screen>

<!-- ==== Method 2 for docs ====== -->
    <bridgehead renderas="sect3">If you downloaded the man pages and/or html docs</bridgehead>

    <para>
      If you downloaded the man pages untar them as the
      <systemitem class="username">root</systemitem> user:
    </para>

<screen role="root"><userinput>tar -xf ../git-manpages-&git-version;.tar.xz \
    -C /usr/share/man --no-same-owner --no-overwrite-dir</userinput></screen>

    <para>
      If you downloaded the html docs untar them as the
      <systemitem class="username">root</systemitem> user:
    </para>

<screen role="root"><userinput>mkdir -vp   /usr/share/doc/git-&git-version; &amp;&amp;
tar   -xf   ../git-htmldocs-&git-version;.tar.xz \
      -C    /usr/share/doc/git-&git-version; --no-same-owner --no-overwrite-dir &amp;&amp;

find        /usr/share/doc/git-&git-version; -type d -exec chmod 755 {} \; &amp;&amp;
find        /usr/share/doc/git-&git-version; -type f -exec chmod 644 {} \;</userinput></screen>

<!-- ==== Reorganize docs ====== -->
    <bridgehead renderas="sect3">Reorganize text and html in the html-docs (both methods)</bridgehead>

    <para>
      For both methods, the html-docs include a lot of plain text files.
      Reorganize the files as the
      <systemitem class="username">root</systemitem> user:
    </para>

<screen role="root"><userinput>mkdir -vp /usr/share/doc/git-&git-version;/man-pages/{html,text}         &amp;&amp;
mv        /usr/share/doc/git-&git-version;/{git*.txt,man-pages/text}     &amp;&amp;
mv        /usr/share/doc/git-&git-version;/{git*.,index.,man-pages/}html &amp;&amp;

mkdir -vp /usr/share/doc/git-&git-version;/technical/{html,text}         &amp;&amp;
mv        /usr/share/doc/git-&git-version;/technical/{*.txt,text}        &amp;&amp;
mv        /usr/share/doc/git-&git-version;/technical/{*.,}html           &amp;&amp;

mkdir -vp /usr/share/doc/git-&git-version;/howto/{html,text}             &amp;&amp;
mv        /usr/share/doc/git-&git-version;/howto/{*.txt,text}            &amp;&amp;
mv        /usr/share/doc/git-&git-version;/howto/{*.,}html               &amp;&amp;

sed -i '/^&lt;a href=/s|howto/|&amp;html/|' /usr/share/doc/git-&git-version;/howto-index.html &amp;&amp;
sed -i '/^\* link:/s|howto/|&amp;html/|' /usr/share/doc/git-&git-version;/howto-index.txt</userinput></screen>

  </sect2>

  <sect2 role="commands">
    <title>Command Explanations</title>

    <para>
      <parameter>--with-gitconfig=/etc/gitconfig</parameter>: This sets
      <filename>/etc/gitconfig</filename> as the file that stores
      the default, system wide, <application>Git</application>
      settings.
    </para>

    <para>
      <parameter>--with-python=python3</parameter>: Use this switch to use
      <application>Python 3</application>, instead of the EOL'ed
      <application>Python 2</application>. Python is used for the
      <command>git p4</command> interface to Perforce repositories,
      and also used in some tests.
    </para>

    <para>
      <option>--with-libpcre2</option>: Use this switch if
      <application>PCRE2</application> is installed and has been built with
      the non-default JIT enabled.
    </para>

    <para>
      <option>--with-libpcre1</option>: As an alternative to PCRE2, use this
      switch if the deprecated <application>PCRE</application> is installed
      and has been built with the non-default JIT enabled.
    </para>

    <para>
      <command>tar -xf ../git-manpages-&git-version;.tar.gz -C
      /usr/share/man --no-same-owner</command>: This untars
      <filename>git-manpages-&git-version;.tar.gz</filename>. The
      <option>-C</option> option makes tar change directory to
      <filename class="directory">/usr/share/man</filename> before
      it starts to decompress the docs. The <option>--no-same-owner</option>
      option stops tar from preserving the user and group details of the
      files. This is useful as that user or group may not exist on your
      system; this could (potentially) be a security risk.
    </para>

    <para>
      <command>mv /usr/share/doc/git-&git-version; ...</command>: These
      commands move some of the files into subfolders to make it easier to sort
      through the docs and find what you're looking for.
    </para>

    <para>
      <command>find ... chmod ...</command>: These commands correct the
      permissions in the shipped documentation tar file.
    </para>

  </sect2>

  <sect2 role="configuration">
    <title>Configuring Git</title>

    <sect3 id="git-config">
      <title>Config Files</title>
      <para>
        <filename>~/.gitconfig</filename> and
        <filename>/etc/gitconfig</filename>
      </para>

      <indexterm zone="git git-config">
        <primary sortas="e-AA.gitconfig">~/.gitconfig</primary>
      </indexterm>

      <indexterm zone="git git-config">
        <primary sortas="e-etc-gitconfig">/etc/gitconfig</primary>
      </indexterm>

    </sect3>

  </sect2>

  <sect2 role="content">
    <title>Contents</title>

    <segmentedlist>
      <segtitle>Installed Programs</segtitle>
      <segtitle>Installed Libraries</segtitle>
      <segtitle>Installed Directories</segtitle>

      <seglistitem>
        <seg>
          git, git-receive-pack, git-upload-archive, and
          git-upload-pack (hardlinked to each
          other), git-cvsserver, git-shell, gitk, and scalar
        </seg>
        <seg>
          None
        </seg>
        <seg>
          /usr/libexec/git-core,
          /usr/lib/perl5/&lfs-perl-version;/site_perl/Git, and
          /usr/share/{doc/git-&git-version;,git-core,git-gui,gitk,gitweb}
        </seg>
      </seglistitem>
    </segmentedlist>

    <variablelist>
      <bridgehead renderas="sect3">Short Descriptions</bridgehead>
      <?dbfo list-presentation="list"?>
      <?dbhtml list-presentation="table"?>

      <varlistentry id="git-prog">
        <term><command>git</command></term>
        <listitem>
          <para>
            is the stupid content tracker
          </para>
          <indexterm zone="git git-prog">
            <primary sortas="b-git">git</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="git-cvsserver">
        <term><command>git-cvsserver</command></term>
        <listitem>
          <para>
            is a CVS server emulator for <application>Git</application>
          </para>
          <indexterm zone="git git-cvsserver">
            <primary sortas="b-git-cvsserver">git-cvsserver</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="gitk">
        <term><command>gitk</command></term>
        <listitem>
          <para>
            is a graphical <application>Git</application> repository browser
            (needs <xref linkend="tk"/>)
          </para>
          <indexterm zone="git gitk">
            <primary sortas="b-gitk">gitk</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="git-receive-pack">
        <term><command>git-receive-pack</command></term>
        <listitem>
          <para>
            is invoked by <command>git send-pack</command> and updates the
            repository with the information fed from the remote end
          </para>
          <indexterm zone="git git-receive-pack">
            <primary sortas="b-git-receive-pack">git-receive-pack</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="git-shell">
        <term><command>git-shell</command></term>
        <listitem>
          <para>
            is a login shell for SSH accounts to provide restricted Git
            access
          </para>
          <indexterm zone="git git-shell">
            <primary sortas="b-git-shell">git-shell</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="git-upload-archive">
        <term><command>git-upload-archive</command></term>
        <listitem>
          <para>
            is invoked by <command>git archive --remote</command> and sends
            a generated archive to the other end over the git protocol
          </para>
          <indexterm zone="git git-upload-archive">
            <primary sortas="b-git-upload-archive">git-upload-archive</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="git-upload-pack">
        <term><command>git-upload-pack</command></term>
        <listitem>
          <para>
            is invoked by <command>git fetch-pack</command>, it discovers
            what objects the other side is missing, and sends them after
            packing
          </para>
          <indexterm zone="git git-upload-pack">
            <primary sortas="b-git-upload-pack">git-upload-pack</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="scalar">
        <term><command>scalar</command></term>
        <listitem>
          <para>
            is a repository management tool that optimizes Git for use in
            large repositories
          </para>
          <indexterm zone="git scalar">
            <primary sortas="b-scalar">scalar</primary>
          </indexterm>
        </listitem>
      </varlistentry>
    </variablelist>

  </sect2>

</sect1>