lfs-book/chapter05/expect.xml

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<sect1 id="ch-tools-expect" role="wrap">
  <?dbhtml filename="expect.html"?>

  <sect1info condition="script">
    <productname>expect</productname>
    <productnumber>&expect-version;</productnumber>
    <address>&expect-url;</address>
  </sect1info>

  <title>Expect-&expect-version;</title>

  <indexterm zone="ch-tools-expect">
    <primary sortas="a-Expect">Expect</primary>
  </indexterm>

  <sect2 role="package">
    <title/>

    <para>The <application>Expect</application> package contains tools for
    automating, via scripted dialogues, interactive applications such as
    <command>telnet</command>, <command>ftp</command>,
    <command>passwd</command>, <command>fsck</command>,
    <command>rlogin</command>, and <command>tip</command>.
    <application>Expect</application> is also useful for testing these same
    applications as well as easing all sorts of tasks that are prohibitively
    difficult with anything else. The <application>DejaGnu</application>
    framework is written in <application>Expect</application>.</para>

    <segmentedlist>
      <segtitle>&buildtime;</segtitle>
      <segtitle>&diskspace;</segtitle>

      <seglistitem>
        <seg>&expect-ch5-sbu;</seg>
        <seg>&expect-ch5-du;</seg>
      </seglistitem>
    </segmentedlist>

  </sect2>

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

    <para>First, force Expect's configure script to use <filename>/bin/stty</filename>
    instead of a <filename>/usr/local/bin/stty</filename> it may find on the host system.
    This will ensure that our test suite tools remain sane for the final builds of our
    toolchain:</para>

<screen><userinput remap="pre">cp -v configure{,.orig}
sed 's:/usr/local/bin:/bin:' configure.orig &gt; configure</userinput></screen>

    <para>Now prepare Expect for compilation:</para>

<screen><userinput remap="configure">./configure --prefix=/tools       \
            --with-tcl=/tools/lib \
            --with-tclinclude=/tools/include</userinput></screen>

    <variablelist>
      <title>The meaning of the configure options:</title>

      <varlistentry>
        <term><parameter>--with-tcl=/tools/lib</parameter></term>
        <listitem>
          <para>This ensures that the configure script finds the Tcl
          installation in the temporary tools location instead of possibly
          locating an existing one on the host system.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><parameter>--with-tclinclude=/tools/include</parameter></term>
        <listitem>
          <para>This explicitly tells Expect where to find Tcl's internal
          headers. Using this option avoids conditions where
          <command>configure</command> fails because it cannot automatically
          discover the location of Tcl's headers.</para>
        </listitem>
      </varlistentry>

    </variablelist>

    <para>Build the package:</para>

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

    <para>Compilation is now complete. As discussed earlier, running the test
    suite is not mandatory for the temporary tools here in this chapter. To run
    the Expect test suite anyway, issue the following command:</para>

<screen><userinput remap="test">make test</userinput></screen>

    <para>Note that the Expect test suite is known to experience failures under
    certain host conditions that are not within our control. Therefore,
    test suite failures here are not surprising and are not considered
    critical.</para>

    <para>Install the package:</para>

<screen><userinput remap="install">make SCRIPTS="" install</userinput></screen>

    <variablelist>
      <title>The meaning of the make parameter:</title>

      <varlistentry>
        <term><parameter>SCRIPTS=""</parameter></term>
        <listitem>
          <para>This prevents installation of the supplementary Expect
          scripts, which are not needed.</para>
        </listitem>
      </varlistentry>

    </variablelist>

  </sect2>

  <sect2 id="contents-expect" role="content">
    <title>Contents of Expect</title>

    <segmentedlist>
      <segtitle>Installed program</segtitle>
      <segtitle>Installed library</segtitle>

      <seglistitem>
        <seg>expect</seg>
        <seg>libexpect-&expect-lib-version;.so</seg>
      </seglistitem>
    </segmentedlist>

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

      <varlistentry id="expect">
        <term><command>expect</command></term>
        <listitem>
          <para>Communicates with other interactive programs according
          to a script</para>
          <indexterm zone="ch-tools-expect expect">
            <primary sortas="b-expect">expect</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="libexpect">
        <term><filename class="libraryfile">libexpect-&expect-lib-version;.so</filename></term>
        <listitem>
          <para>Contains functions that allow Expect to be used as a Tcl
          extension or to be used directly from C or C++ (without Tcl)</para>
          <indexterm zone="ch-tools-expect libexpect">
            <primary sortas="c-libexpect-&expect-lib-version;">libexpect-&expect-lib-version;</primary>
          </indexterm>
        </listitem>
      </varlistentry>

    </variablelist>

  </sect2>

</sect1>