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This virtual service provides a facility to make runscripts that depends on a
syslog daemon portable across different systems, for instance when
the logger daemon name is not known in advance.
This service is not a logger daemon itself, and does not provide runscripts
for syslog daemons.
Usage:
* make sure this service is enabled in your rundirectory
# update-service --add /etc/sv/default-syslog
* to make sure that a syslog daemon is avaliable before your service is up
add the following line in the run file of your service
'sv start default-syslog && sv check default-syslog || exit 170'
Given that the trick is done in the check file, the sleep time in the default-syslog
service can be raised at will.
In the majority of cases this service will check if some process is listening to /dev/log; as
a fallback for when programs used to check /dev/log are not available, the check file loops
throught a hardcoded list of syslog daemons and discover if they are up.
To avoid the fallback make sure that at least one package between socklog, ucspi-unix
and psmisc is installed.
Limits/bugs:
* when fuser (psmisc) is used this service fails to catch a logger running in a different
namespace; also fuser is not available in Hurd.
* when the fallback is used the default-syslog works only if:
1. at least one native runit service exists for a syslog daemon
2. the name of the native runit service match the one in the check file
3. the syslog daemon is enabled in the current rundirectory
the fallback does not work if the logger is started with a sysvinit script or with
a systemd service.
Note that when runit is init, sysvscripts are always started before runsvdir, so
as long as no native runscript is available for the syslog daemon, it is possible
to skip the check for syslog in any runscript.
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