[service dependent] describe non-warm-reboot dependency outside systemd (sonic-net#3311)

* [service dependent] describe non-warm-reboot dependency outside systemctl

When dependency was described with systemctl, it will kick in all the time,
including under warm reboot/restart scenarios. This is not what we always
want. For components that are capable of warm reboot/start, they need to
describe dependency in service files.

Signed-off-by: Ying Xie <ying.xie@microsoft.com>

* [service] teamd service should not require swss service

Adding require swss will cause teamd to be killed by systemctl when swss
stops. This is not what we want in warm reboot.

Signed-off-by: Ying Xie <ying.xie@microsoft.com>

* refactoring code

* rename functions to match other functions in the file

Author: yxieca

files/build_templates/teamd.service.j2

@@ -1,6 +1,6 @@
 [Unit]
 Description=TEAMD container
-Requires=updategraph.service swss.service
+Requires=updategraph.service
 After=updategraph.service swss.service
 Before=ntp-config.service
 
@@ -11,4 +11,4 @@ ExecStart=/usr/bin/{{docker_container_name}}.sh wait
 ExecStop=/usr/bin/{{docker_container_name}}.sh stop
 
 [Install]
-WantedBy=multi-user.target swss.service
+WantedBy=multi-user.target

files/scripts/swss.sh

@@ -2,6 +2,7 @@
 
 SERVICE="swss"
 PEER="syncd"
+DEPENDENT="teamd"
 DEBUGLOG="/tmp/swss-syncd-debug.log"
 LOCKFILE="/tmp/swss-syncd-lock"
 
@@ -78,11 +79,24 @@ function clean_up_tables()
     end" 0
 }
 
-startPeerService() {
+start_peer_and_dependent_services() {
     check_warm_boot
 
     if [[ x"$WARM_BOOT" != x"true" ]]; then
         /bin/systemctl start ${PEER}
+        for dep in ${DEPENDENT}; do
+            /bin/systemctl start ${dep}
+        done
+    fi
+}
+
+stop_peer_and_dependent_services() {
+    # if warm start enabled or peer lock exists, don't stop peer service docker
+    if [[ x"$WARM_BOOT" != x"true" ]]; then
+        /bin/systemctl stop ${PEER}
+        for dep in ${DEPENDENT}; do
+            /bin/systemctl stop ${dep}
+        done
     fi
 }
 
@@ -116,7 +130,7 @@ start() {
 }
 
 wait() {
-    startPeerService
+    start_peer_and_dependent_services
     /usr/bin/${SERVICE}.sh wait
 }
 
@@ -135,10 +149,7 @@ stop() {
     # Unlock has to happen before reaching out to peer service
     unlock_service_state_change
 
-    # if warm start enabled or peer lock exists, don't stop peer service docker
-    if [[ x"$WARM_BOOT" != x"true" ]]; then
-        /bin/systemctl stop ${PEER}
-    fi
+    stop_peer_and_dependent_services
 }
 
 case "$1" in