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tmpfiles: Add note to man page about guaranteed cleanup for files/directories

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Daan De Meyer 2023-06-20 12:59:24 +02:00
parent 08c25eee34
commit dbc3cc8b83
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8
man/tmpfiles.d.xml
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@ -661,6 +661,14 @@ d /tmp/foo/bar - - - bmA:1h -</programlisting></para>
Applications may use this to temporarily exclude certain directory subtrees from the aging algorithm:
the applications can take a BSD file lock themselves, and as long as they keep it aging of the
directory/file and everything below it is disabled.</para>
<para>This behavior can be used to ensure guaranteed cleanup of files or directories whose lifetime
should be aligned with the process that created them by having that process create them in a location
monitored by <command>systemd-tmpfiles</command> with an age of <literal>0</literal>, and having the
process immediately lock the directory or file before using it. Because the BSD lock is process
specific, the file is guaranteed to be unlocked as soon as the process exits, meaning that even if the
process crashes, those files and directories will be unlocked and cleaned up by
<command>systemd-tmpfiles</command>.</para>
</refsect2>
<refsect2>