[docker-syncd-vs]: use service dependency in supervisord to start services

platform/vs/docker-syncd-vs/start.sh

@@ -1,30 +1,7 @@
 #!/usr/bin/env bash
 
-PLATFORM_DIR=/usr/share/sonic/platform
 HWSKU_DIR=/usr/share/sonic/hwsku
 
-SYNCD_SOCKET_FILE=/var/run/sswsyncd/sswsyncd.socket
-
-# Function: wait until syncd has created the socket for bcmcmd to connect to
-wait_syncd() {
-    while true; do
-        if [ -e ${SYNCD_SOCKET_FILE} ]; then
-            break
-        fi
-        sleep 1
-    done
-
-    # wait until bcm sdk is ready to get a request
-    sleep 3
-}
-
-
-# Remove stale files if they exist
-rm -f /var/run/rsyslogd.pid
-rm -f ${SYNCD_SOCKET_FILE}
-
-supervisorctl start rsyslogd
-
 mkdir -p /etc/sai.d/
 
 # Create/Copy the sai.profile to /etc/sai.d/sai.profile
@@ -35,11 +12,3 @@ else
         cp $HWSKU_DIR/sai.profile /etc/sai.d/sai.profile
     fi
 fi
-
-supervisorctl start syncd
-
-# If this platform has an initialization file for the Broadcom LED microprocessor, load it
-if [ -r ${PLATFORM_DIR}/led_proc_init.soc ]; then
-    wait_syncd
-    supervisorctl start ledinit
-fi

platform/vs/docker-syncd-vs/supervisord.conf

@@ -3,27 +3,39 @@ logfile_maxbytes=1MB
 logfile_backups=2
 nodaemon=true
 
+[eventlistener:dependent-startup]
+command=python -m supervisord_dependent_startup
+autostart=true
+autorestart=unexpected
+startretries=0
+exitcodes=0,3
+events=PROCESS_STATE
+
 [eventlistener:supervisor-proc-exit-listener]
 command=/usr/bin/supervisor-proc-exit-listener --container-name syncd
 events=PROCESS_STATE_EXITED
 autostart=true
 autorestart=unexpected
 
-[program:start.sh]
-command=/usr/bin/start.sh
-priority=1
-autostart=true
-autorestart=false
-stdout_logfile=syslog
-stderr_logfile=syslog
-
 [program:rsyslogd]
-command=/usr/sbin/rsyslogd -n
-priority=2
+command=/usr/sbin/rsyslogd -n -iNONE
+priority=1
 autostart=false
 autorestart=unexpected
 stdout_logfile=syslog
 stderr_logfile=syslog
+dependent_startup=true
+
+[program:start]
+command=/usr/bin/start.sh
+priority=2
+autostart=false
+autorestart=false
+startsecs=0
+stdout_logfile=syslog
+stderr_logfile=syslog
+dependent_startup=true
+dependent_startup_wait_for=rsyslogd:running
 
 [program:syncd]
 command=/usr/bin/syncd_start.sh
@@ -32,3 +44,5 @@ autostart=false
 autorestart=false
 stdout_logfile=syslog
 stderr_logfile=syslog
+dependent_startup=true
+dependent_startup_wait_for=start:exited