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man: document meaning of age in tmpfiles.d (#8092)

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This documents how the age of a file is determined, which previously was
only alluded to in other parts of the documentation. Fixes #8091.

The phrasings of “last modification timestamp” etc. are taken from
man:inode(7) (as of man-pages 4.14). The debug messages in tmpfiles.c
use different messages (“modify time”), which according to a code
comment follow man:stat(1); however, my copy of that manpage (from GNU
coreutils 8.29) documents %y as “time of last data modification”
instead.
This commit is contained in:
Lucas Werkmeister 2018-02-05 08:19:09 +01:00 committed by Zbigniew Jędrzejewski-Szmek
parent 974fdd2626
commit 662b3e5861
1 changed files with 7 additions and 0 deletions
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7
man/tmpfiles.d.xml
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@ -579,6 +579,13 @@ r! /tmp/.X[0-9]*-lock</programlisting>
<literal>~</literal>, the clean-up is only applied to files and
directories one level inside the directory specified, but not
the files and directories immediately inside it.</para>
<para>The age of a file system entry is determined from its last
modification timestamp (mtime), its last access timestamp (atime),
and (except for directories) its last status change timestamp
(ctime). Any of these three (or two) values will prevent cleanup
if it is more recent than the current time minus the age
field.</para>
</refsect2>
<refsect2>