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Subject: svlogd, when rotating, sets the log files as executable. Why?
From: Jamie Heilman <jamie@audible.transient.net>
Date: Mon, 8 Feb 2016 06:12:27 +0000
This is all based off daemontools' multilog ...
https://cr.yp.to/daemontools/multilog.html
... which states:
While multilog is running, current has mode 644. If multilog sees
the end of stdin, it writes current safely to disk, and sets the
mode of current to 744. When it restarts, it sets the mode of
current back to 644 and continues writing new lines.
When multilog decides that current is big enough, it writes current
safely to disk, sets the mode of current to 744, and renames current
as an old log file.
Thus it's effectively using the mode bits as flag to communicate the
state of the application, which while unusual, is harmless.
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