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logging: try to reopen message log on cyclelogs command

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When the cyclelogs command is issued, check if the file specified by the
-l option is still in its place and if not try opening it again. If that
fails (e.g. due to chrony no longer having root privileges), keep the
old file handle to avoid losing log messages.
This commit is contained in:
Miroslav Lichvar
2025-03-20 12:57:37 +01:00
parent 75bbccf518
commit dd8738119b
2 changed files with 47 additions and 6 deletions
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7
doc/chronyc.adoc
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@@ -1467,6 +1467,13 @@ purged. An example of how to do this is shown below.
# chronyc cyclelogs
# rm /var/log/chrony/measurements1.log
----
+
Note that log files enabled by the *log* directive are opened when the first
entry is made. The message log file specified by the *chronyd*'s *-l* option is
opened early on start and closed on the *cyclelogs* command only if opening of
the new file succeeds to avoid losing messages. If *chronyd* is configured to
drop root privileges and the directory containg the log file is not writable
for the specified user, *chronyd* will not be able to open the file again.
[[dump]]*dump*::
The *dump* command causes *chronyd* to write its current history of