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man: add an example how to unconditionally empty a directory (#4570)

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It was logical, but not entirely obvious, that 'e' with no arguments does
nothing. Expand the explanation a bit and add an example.

Fixes #4564.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2016-11-08 03:39:10 -05:00 committed by Martin Pitt
parent d07903848f
commit ed7fd549d0
1 changed files with 22 additions and 6 deletions
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28
man/tmpfiles.d.xml
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@ -117,8 +117,8 @@
type, path, mode, ownership, age, and argument fields:</para>
<programlisting>#Type Path Mode UID GID Age Argument
d /run/user 0755 root root 10d -
L /tmp/foobar - - - - /dev/null</programlisting>
d /run/user 0755 root root 10d -
L /tmp/foobar - - - - /dev/null</programlisting>
<para>Fields may be enclosed within quotes and contain C-style escapes.</para>
@ -159,7 +159,7 @@
<term><varname>d</varname></term>
<listitem><para>Create a directory. The mode and ownership will be adjusted if
specified and the directory already exists. Contents of this directory are subject
to time based cleanup if the time argument is specified.</para></listitem>
to time based cleanup if the age argument is specified.</para></listitem>
</varlistentry>
<varlistentry>
@ -171,9 +171,13 @@
<varlistentry>
<term><varname>e</varname></term>
<listitem><para>Similar to <varname>d</varname>, but the directory will not be
created if it does not exist. Lines of this type accept shell-style globs in
place of normal path names.</para></listitem>
<listitem><para>Similar to <varname>d</varname>, but the directory will not be created if
it does not exist. Lines of this type accept shell-style globs in place of normal path
names. For this entry to be useful, at least one of the mode, uid, gid, or age arguments
must be specified, since otherwise this entry has no effect. If the age argument is
<literal>0</literal>, contents of the directory will be unconditionally deleted every time
<command>systemd-tmpfiles --clean</command> is run. This can be useful when combined with
<varname>!</varname>, see the examples.</para></listitem>
</varlistentry>
<varlistentry>
@ -680,6 +684,18 @@ e /var/chache/dnf/ - - - 30d
<filename>/var/chache/dnf/</filename> will be removed after they have not been
accessed in 30 days.</para>
</example>
<example>
<title>Empty the contents of the a cache directory on boot</title>
<programlisting># /usr/lib/tmpfiles.d/krb5rcache.conf
e! /var/cache/krb5rcache - - - 0
</programlisting>
<para>Any files and subdirectories in <filename>/var/cache/krb5rcache/</filename>
will be removed on boot. The directory will not be created.
</para>
</example>
</refsect1>
<refsect1>