Add loopback check. (#24357)

Add loopback check.

Author: dypet

dockers/docker-dash-ha/supervisord.conf

@@ -30,21 +30,34 @@ stderr_logfile=NONE
 stderr_syslog=true
 dependent_startup=true
 
+[program:wait-for-loopback]
+command=/usr/bin/python3 /usr/bin/wait_for_loopback.py
+priority=2
+autostart=false
+autorestart=false
+startsecs=0
+stdout_logfile=NONE
+stdout_syslog=true
+stderr_logfile=NONE
+stderr_syslog=true
+dependent_startup=true
+dependent_startup_wait_for=rsyslogd:running
+
 [program:swbusd]
 command=/bin/bash -c 'SLOT=${DEV: -1}; exec /usr/bin/swbusd -s "$SLOT"'
-priority=2
+priority=3
 autostart=false
 autorestart=true
 stdout_logfile=NONE
 stdout_syslog=true
 stderr_logfile=NONE
 stderr_syslog=true
 dependent_startup=true
-dependent_startup_wait_for=rsyslogd:running
+dependent_startup_wait_for=wait-for-loopback:exited
 
 [program:hamgrd]
 command=/bin/bash -c 'SLOT=${DEV: -1}; exec /usr/bin/hamgrd -s "$SLOT"'
-priority=3
+priority=4
 autostart=false
 autorestart=false
 stdout_logfile=NONE