openrc-run: default supervisor stdout and stderr to logger

Currently we redirect any stdout and stderr output to /dev/null. This is
making debugging, or helping others debug, unnecessarily harder, so
let's just assign a sane default that should work on most systems.

etc/rc.conf

@@ -54,6 +54,13 @@
 # The default value is: /var/log/rc.log
 #rc_log_path="/var/log/rc.log"
 
+# rc_output_logger and rc_error_logger specify the default commands
+# used to log the stdout and stderr of services.
+# Scripts can override those by setting output_logger and error_logger,
+# respectively, to a value, or disable logging by setting to null.
+#rc_output_logger="logger -t 'openrc[$RC_SVCNAME]' -p daemon.notice"
+#rc_error_logger="logger -t 'openrc[$RC_SVCNAME]' -p daemon.err"
+
 # If you want verbose output for OpenRC, set this to yes. If you want
 # verbose output for service foo only, set it to yes in /etc/conf.d/foo.
 #rc_verbose=no

sh/openrc-run.sh.in

@@ -164,6 +164,10 @@ _status()
 default_start()
 {
 	local func=ssd_start
+
+	: ${output_logger=${rc_output_logger-"logger -t 'openrc[$RC_SVCNAME]' -p daemon.notice"}}
+	: ${error_logger=${rc_error_logger-"logger -t 'openrc[$RC_SVCNAME]' -p daemon.err"}}
+
 	case "$supervisor" in
 		runit) func=runit_start ;;
 		s6) func=s6_start ;;