fix: systemd ExecStartPre with - prefix, remove symlink dependency

- ExecStartPre=- allows nginx start failure without blocking service
- Removed shell constructs (|| true) incompatible with systemd
- Removed env.list background goroutine (setup.sh no longer used)
- Multi-instance needs per-instance ELF patching (WIP)

internal/native/native.go

@@ -6,7 +6,6 @@ import (
 	"os/exec"
 	"path/filepath"
 	"strings"
-	"time"
 
 	"git.sechpoint.app/customer-engineering/wallarm/internal/state"
 )
@@ -44,7 +43,6 @@ func InstallNode(node state.Node, apiToken, apiHost, labels string) error {
 	}
 	killPort(port)
 	copyNginx(DeployTo)
-	startNginx(DeployTo, node, port)
 
 	// 3. Download AIO once
 	if _, err := os.Stat(installerPath); os.IsNotExist(err) {
@@ -63,27 +61,15 @@ func InstallNode(node state.Node, apiToken, apiHost, labels string) error {
 		return fmt.Errorf("extract: %w\n%s", err, string(out))
 	}
 
-	// 5. Fix: recreate env.list in background while setup.sh runs
-	done := make(chan struct{})
-	go func() {
-		defer close(done)
-		for {
-			select {
-			case <-done:
-				return
-			default:
-				os.WriteFile(filepath.Join(DeployTo, "env.list"),
-					[]byte("# wallarm env\n"), 0644)
-				time.Sleep(500 * time.Millisecond)
-			}
-		}
-	}()
+	// 5. Start NGINX (modules now available after extraction)
+	startNginx(DeployTo, node, port)
 
 	// 6. Load Wallarm NGINX module + register node
 	fmt.Printf("[%s] Configuring NGINX module...\n", node.Name)
 	exec.Command("bash", filepath.Join(DeployTo, "pick-module.sh")).Run()
 
-	// 6. Register node
+	// 7. Kill stale wcli lock (from other instances) then register
+	exec.Command("rm", "-f", "/tmp/.wallarm.wcli.lock").Run()
 	fmt.Printf("[%s] Registering node (this may take 30-60s)...\n", node.Name)
 	registerCmd := exec.Command(filepath.Join(DeployTo, "register-node"),
 		"job:register",
@@ -182,11 +168,11 @@ After=network.target
 Type=simple
 WorkingDirectory=%s/%%i/wallarm
 EnvironmentFile=-%s/%%i/wallarm/env.list
-ExecStartPre=%s/%%i/wallarm/nginx/sbin/nginx -c %s/%%i/wallarm/nginx/conf/nginx.conf -p %s/%%i/wallarm/nginx/ 2>/dev/null || true
+ExecStartPre=-%s/%%i/wallarm/nginx/sbin/nginx -c %s/%%i/wallarm/nginx/conf/nginx.conf -p %s/%%i/wallarm/nginx/
 ExecStartPre=/bin/sleep 2
 ExecStart=%s/%%i/wallarm/usr/bin/python3.10 %s/%%i/wallarm/usr/bin/supervisord -c %s/%%i/wallarm/etc/supervisord.conf
 ExecStop=%s/%%i/wallarm/usr/bin/python3.10 %s/%%i/wallarm/usr/bin/supervisord -c %s/%%i/wallarm/etc/supervisord.conf shutdown
-ExecStopPost=%s/%%i/wallarm/nginx/sbin/nginx -s quit -p %s/%%i/wallarm/nginx/ 2>/dev/null || true
+ExecStopPost=-%s/%%i/wallarm/nginx/sbin/nginx -s quit -p %s/%%i/wallarm/nginx/
 Restart=on-failure
 RestartSec=5
 User=root