algorithm to set the priorities of the versions of a package. Assign:
<variablelist>
+<varlistentry>
+<term>priority 1</term>
+<listitem><simpara>to the versions coming from archives which in their <filename>Release</filename>
+files are marked as "NotAutomatic: yes" like the debian experimental archive.</simpara></listitem>
+</varlistentry>
+
<varlistentry>
<term>priority 100</term>
<listitem><simpara>to the version that is already installed (if any).</simpara></listitem>
<para>If the target release has not been specified then APT simply assigns
priority 100 to all installed package versions and priority 500 to all
-uninstalled package versions.</para>
+uninstalled package versions, expect versions coming from archives which
+in their <filename>Release</filename> files are marked as "NotAutomatic: yes" -
+these versions get the priority 1.</para>
<para>APT then applies the following rules, listed in order of precedence,
to determine which version of a package to install.
</programlisting>
<simpara>The following record assigns a high priority to all package versions
-belonging to any distribution whose Codename is "<literal>squeeze</literal>".</simpara>
+belonging to any distribution whose Codename is "<literal>&testing-codename;</literal>".</simpara>
<programlisting>
Package: *
-Pin: release n=squeeze
+Pin: release n=&testing-codename;
Pin-Priority: 900
</programlisting>
<para>The <filename>Release</filename> file is normally found in the directory
<filename>.../dists/<replaceable>dist-name</replaceable></filename>:
for example, <filename>.../dists/stable/Release</filename>,
-or <filename>.../dists/woody/Release</filename>.
+or <filename>.../dists/&stable-codename;/Release</filename>.
It consists of a single multi-line record which applies to <emphasis>all</emphasis> of
the packages in the directory tree below its parent. Unlike the
<filename>Packages</filename> file, nearly all of the lines in a <filename>Release</filename>
<term>the <literal>Codename:</literal> line</term>
<listitem><simpara>names the codename to which all the packages
in the directory tree belong. For example, the line
-"Codename: squeeze"
+"Codename: &testing-codename;"
specifies that all of the packages in the directory
tree below the parent of the <filename>Release</filename> file belong to a version named
-<literal>squeeze</literal>. Specifying this value in the APT preferences file
+<literal>&testing-codename;</literal>. Specifying this value in the APT preferences file
would require the line:
</simpara>
<programlisting>
-Pin: release n=squeeze
+Pin: release n=&testing-codename;
</programlisting>
</listitem>
</varlistentry>
<programlisting>
Explanation: Uninstall or do not install any Debian-originated package versions
-Explanation: other than those in the distribution codenamed with squeeze or sid
+Explanation: other than those in the distribution codenamed with &testing-codename; or sid
Package: *
-Pin: release n=squeeze
+Pin: release n=&testing-codename;
Pin-Priority: 900
Explanation: Debian unstable is always codenamed with sid
<para>With a suitable &sources-list; file and the above preferences file,
any of the following commands will cause APT to upgrade to the
-latest version(s) in the release codenamed with <literal>squeeze</literal>.
+latest version(s) in the release codenamed with <literal>&testing-codename;</literal>.
<programlisting>
apt-get install <replaceable>package-name</replaceable>
<para>The following command will cause APT to upgrade the specified
package to the latest version from the <literal>sid</literal> distribution.
Thereafter, <command>apt-get upgrade</command> will upgrade
-the package to the most recent <literal>squeeze</literal> version if that is
+the package to the most recent <literal>&testing-codename;</literal> version if that is
more recent than the installed version, otherwise, to the most recent
<literal>sid</literal> version if that is more recent than the installed
version.