newsyslog can't execute command?

[Oliver Fromme]

Ferdinand Goldmann wrote:
 > Have I overlooked something, or is it not possible with newsyslog to run a
 > certain command after log rotation? :-(

That's correct.

A simple workaround is to write a small shell script that
stores its PID in a file, then runs in the background and
waits for a signal.  It's a hack, but it works.

Basically, something like this will do:

 #!/bin/sh -
 echo $$ > /var/run/loghandler-foo.pid
 while :; do
 	kill -STOP $$
 	...
 	do whatever you want with the log file
 	...
 done

Make sure that shell script is run in the background
during system boot.

The newsyslog.conf entry should look like this:

/var/log/foo.log     644  3  100  *  B  /var/run/loghandler-foo.pid 19

The important thing is the number "19" at the end, which
will cause newsyslog to send SIGCONT to the shell script
after it has rotated the log file.

Alternatively you can also use the shell's built-in "trap"
command to use different signals.

Best regards
   Oliver

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