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add a paragraph for "downgrading issue" in package management page

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Xi Ruoyao 2021-04-23 01:38:47 +08:00
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chapter08/pkgmgt.xml
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@ -71,7 +71,27 @@
against <filename class='libraryfile'>libfoo.so.2</filename> in order to against <filename class='libraryfile'>libfoo.so.2</filename> in order to
use the new library version. You should not remove the previous use the new library version. You should not remove the previous
libraries unless all the dependent packages are recompiled.</para> libraries unless all the dependent packages are recompiled.</para>
</listitem> </itemizedlist> </listitem>
<listitem> <para>If a package containing a shared library is updated,
and the name of library doesn't change, but the version number of the
library <emphasis role="bold">file</emphasis> decreases (for example,
the name of the library is kept named
<filename class='libraryfile'>libfoo.so.1</filename>,
but the name of library file is changed from
<filename class='libraryfile'>libfoo.so.1.25</filename> to
<filename class='libraryfile'>libfoo.so.1.24</filename>),
you should remove the library file from the previously installed version
(<filename class='libraryfile'>libfoo.so.1.25</filename> in the case).
Or, a <command>ldconfig</command> run (by yourself using a command
line, or by the installation of some package) will reset the symlink
<filename class='libraryfile'>libfoo.so.1</filename> to point to
the old library file because it seems having a <quote>newer</quote>
version, as its version number is larger. This situation may happen if
you have to downgrade a package, or the package changes the versioning
scheme of library files suddenly.</para> </listitem>
</itemizedlist>
</sect2> </sect2>