Add OpenRC agent script

Signed-off-by: Darko Draskovic <darko.draskovic@gmail.com>

Makefile

@@ -22,11 +22,16 @@ $(SERVICES):
 
 
 QCOW2_PATH = ~/go/src/github.com/ultravioletrs/manager/cmd/manager/img/boot.img
+
 HOST_AGENT_PATH = ~/ultravioletrs/agent/build/cocos-agent
 GUEST_AGENT_PATH = /root/agent
+
 HOST_AGENT_SH_PATH = ~/go/src/github.com/ultravioletrs/agent/alpine/agent.sh
 GUEST_AGENT_SH_PATH = /root/agent/
 
+HOST_AGENT_RC_SH_PATH = ~/go/src/github.com/ultravioletrs/agent/alpine/agent
+GUEST_AGENT_RC_SH_PATH=/etc/init.d/
+
 # Copy the agent binary to the guest VM
 copy-agent:
 	sudo virt-copy-in -a $(QCOW2_PATH) $(HOST_AGENT_PATH) $(GUEST_AGENT_PATH)
@@ -35,6 +40,11 @@ copy-agent:
 copy-agent-sh:
 	sudo virt-copy-in -a $(QCOW2_PATH) $(HOST_AGENT_SH_PATH) $(GUEST_AGENT_SH_PATH)
 
+# Copy the agent-rc init sh script to the guest VM
+copy-agent-rc-sh:
+	chmod +x $(HOST_AGENT_RC_SH_PATH)
+	sudo virt-copy-in -a $(QCOW2_PATH) $(HOST_AGENT_RC_SH_PATH) $(GUEST_AGENT_RC_SH_PATH)
+
 # docker_mfxkit:
 # 	docker build --no-cache --tag=mainflux/mfxkit -f docker/Dockerfile .
 

README.md

@@ -47,7 +47,9 @@ To see the change in action, run
 curl -i -X POST -H "Content-Type: application/json" localhost:9022/mfxkit -d '{"secret":"secret2"}'
 ```
 
-## Alpine linux
+## Alpine
+
+### cron
 
 To schedula a task _via_ `cron`
 
@@ -64,3 +66,21 @@ To check whether the program is executing, run
 ```sh
 cat /var/log/messages
 ```
+
+### OpenRC
+
+OpenRC is an Alpine's service manager.
+
+Once the `agent` script is copied in `/etc/init.d/` on the guest system, log into the guest system and run
+
+```sh
+rc-update add agent default
+```
+
+and reboot.
+
+### curl
+
+```sh
+curl -i -X POST -H "Content-Type: application/json" 192.168.122.251:9021/agent -d '{"secret":"secret"}'
+```

alpine/agent

@@ -0,0 +1,20 @@
+#!/sbin/openrc-run
+
+command="/root/agent/cocos-agent"
+command_args=""
+
+depend() {
+    need net
+}
+
+start() {
+    ebegin "Starting cocos-agent"
+    start-stop-daemon -S -q -b -m -p /run/cocos-agent.pid -x $command -- $command_args
+    eend $?
+}
+
+stop() {
+    ebegin "Stopping cocos-agent"
+    start-stop-daemon -K -q -p /run/cocos-agent.pid
+    eend $?
+}

alpine/agent.sh

@@ -3,14 +3,20 @@
 AGENT_NAME="cocos-agent"
 AGENT_PATH="$HOME/agent/$AGENT_NAME"
 
-# find the process IDs of running processes based on their name
-if pgrep -x "$AGENT_NAME" >/dev/null; then
-    echo "Executable $AGENT_NAME is already running."
-else
-    if [ -x "$AGENT_PATH" ]; then
-        echo "Executing $AGENT_NAME..."
-        "$AGENT_PATH"
+while true
+do
+    # find the process IDs of running processes based on their name
+    if pgrep -x "$AGENT_NAME" >/dev/null; then
+        echo "Executable $AGENT_NAME is already running."
     else
-        echo "Executable $AGENT_NAME not found at path $AGENT_PATH."
+        if [ -x "$AGENT_PATH" ]; then
+            echo "Executing $AGENT_NAME..."
+            "$AGENT_PATH"
+        else
+            echo "Executable $AGENT_NAME not found at path $AGENT_PATH."
+        fi
     fi
-fi
+    
+    # wait for 15 seconds before running the loop again
+    sleep 15
+done