diff options
Diffstat (limited to 'doc/apt_preferences.5.xml')
| -rw-r--r-- | doc/apt_preferences.5.xml | 31 |
1 files changed, 23 insertions, 8 deletions
diff --git a/doc/apt_preferences.5.xml b/doc/apt_preferences.5.xml index 16e6a7aa0..79132e007 100644 --- a/doc/apt_preferences.5.xml +++ b/doc/apt_preferences.5.xml @@ -115,14 +115,17 @@ from archives which in their <filename>Release</filename> files are marked as "N <varlistentry> <term>priority 500</term> -<listitem><simpara>to the versions that are not installed and do not belong to the target release.</simpara></listitem> +<listitem><simpara>to the versions that do not belong to the target release.</simpara></listitem> </varlistentry> <varlistentry> <term>priority 990</term> -<listitem><simpara>to the versions that are not installed and belong to the target release.</simpara></listitem> +<listitem><simpara>to the versions that belong to the target release.</simpara></listitem> </varlistentry> </variablelist> + +The highest of those priorities whose description matches the version is assigned to the +version. </para> <para>If the target release has not been specified then APT simply assigns @@ -251,6 +254,11 @@ Pin-Priority: 500 </programlisting> </listitem> </itemizedlist> + +The effect of the comma operator is similar to an "and" in logic: All +conditions must be satisfied for the pin to match. There is one exception: +For any type of condition (such as two "a" conditions), only the last such +condition is checked. </para> </refsect2> @@ -267,7 +275,7 @@ expression surrounded by slashes). <programlisting> Package: gnome* /kde/ -Pin: release n=experimental +Pin: release a=experimental Pin-Priority: 500 </programlisting> @@ -339,14 +347,21 @@ only if there is no installed version of the package</simpara></listitem> <term>P < 0</term> <listitem><simpara>prevents the version from being installed</simpara></listitem> </varlistentry> +<varlistentry> +<term>P = 0</term> +<listitem><simpara>has undefined behaviour, do not use it.</simpara></listitem> +</varlistentry> </variablelist> </para> -<para>If any specific-form records match an available package version then the -first such record determines the priority of the package version. -Failing that, -if any general-form records match an available package version then the -first such record determines the priority of the package version.</para> +<para> +The first specific-form record matching an available package version determines +the priority of the package version. +Failing that, the priority of the package is defined as the maximum of all +priorities defined by generic-form records matching the version. +Records defined using patterns in the Pin field other than "*" are treated like +specific-form records. +</para> <para>For example, suppose the APT preferences file contains the three records presented earlier:</para> |