Poll Agent status when starting on Debian

packaging/datadog-agent-base-deb/datadog-agent.init

@@ -111,12 +111,21 @@ case "$1" in
             su $AGENTUSER -c "env LANG=POSIX $DOGSTATSDPATH start > /dev/null 2>&1"
         fi
 
-        sleep 4 # wait for the services to start up
-        if check_status > /dev/null; then
-            log_end_msg 0
-        else
-            log_end_msg 1
-        fi
+        # check if the agent is running once per second for 10 seconds
+        retries=10
+        while [ $retries -gt 1 ]; do
+          if check_status > /dev/null; then
+              # We've started up successfully. Exit cleanly
+              log_end_msg 0
+              exit 0
+          else
+              retries=$(($retries - 1))
+              sleep 1
+          fi
+        done
+        # After 10 tries the agent didn't start. Report an error
+        log_end_msg 1
+        exit 1
         ;;
     stop)
         if [ -f $USE_SUPERVISOR ]; then