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man: document %triggerin usage

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Lennart Poettering 2010-08-06 11:59:37 +02:00
parent ee6cb28869
commit 6908d3842a
1 changed files with 27 additions and 0 deletions
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man/daemon.xml
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@ -828,6 +828,10 @@ endif</programlisting>
if [ $1 -eq 1 ]; then
# Enable (but don't start) the units by default
/bin/systemctl enable foobar.service foobar.socket >/dev/null 2>&amp;1 || :
# Alternatively, just call /bin/systemctl daemon-reload here,
# if the daemon should not be enabled by default on package
# installation
fi
%preun
@ -853,6 +857,29 @@ fi</programlisting>
<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
for details.</para>
<para>To facilitate upgrades from a package
version that shipped only SysV init scripts to
a package version that ships both a SysV init
script and a native systemd service file, use
a fragment like the following:</para>
<programlisting>%triggerin -- foobar &lt; 0.47.11-1
if /sbin/chkconfig foobar ; then
/bin/systemctl enable foobar.service foobar.socket >/dev/null 2>&amp;1 || :
fi</programlisting>
<para>Where 0.47.11-1 is the first package
version that includes the native unit
file. This fragment will ensure that the first
time the unit file is installed it will be
enabled if and only if the SysV init script is
enabled, thus making sure that the the enable
status is not changed. Note that
<command>chkconfig</command> is a command
specific Fedora which can be used to check
whether a SysV init script is enabled. Other
operating systems will have to use different
commands here.</para>
</refsect2>
</refsect1>