Set explicit ExitTimeOut for MacOS agent launchd plist (#594)

* Set explicit ExitTimeOut for MacOS agent launchd plist

(cherry picked from commit c876ac4)

internal/pkg/agent/install/svc.go

@@ -6,6 +6,7 @@ package install
 
 import (
 	"path/filepath"
+	"runtime"
 
 	"github.com/kardianos/service"
 
@@ -18,6 +19,12 @@ const (
 
 	// ServiceDescription is the description for the service.
 	ServiceDescription = "Elastic Agent is a unified agent to observe, monitor and protect your system."
+
+	// Set the launch daemon ExitTimeOut to 60 seconds in order to allow the agent to shutdown gracefully
+	// At the moment the version 8.3 & 8.4 of the agent are taking about 11 secs to shutdown
+	// and the launchd sends SIGKILL after 5 secs which causes the beats processes to be left running orphaned
+	// depending on the shutdown timing.
+	darwinServiceExitTimeout = 60
 )
 
 // ExecutablePath returns the path for the installed Agents executable.
@@ -30,7 +37,7 @@ func ExecutablePath() string {
 }
 
 func newService() (service.Service, error) {
-	return service.New(nil, &service.Config{
+	cfg := &service.Config{
 		Name:             paths.ServiceName,
 		DisplayName:      ServiceDisplayName,
 		Description:      ServiceDescription,
@@ -45,5 +52,57 @@ func newService() (service.Service, error) {
 			"OnFailureDelayDuration": "1s",
 			"OnFailureResetPeriod":   10,
 		},
-	})
+	}
+
+	if runtime.GOOS == "darwin" {
+		// The github.com/kardianos/service library doesn't support ExitTimeOut in their prebuilt template.
+		// This option allows to pass our own template for the launch daemon plist, which is a copy
+		// of the prebuilt template with added ExitTimeOut option
+		cfg.Option["LaunchdConfig"] = darwinLaunchdConfig
+		cfg.Option["ExitTimeOut"] = darwinServiceExitTimeout
+	}
+
+	return service.New(nil, cfg)
 }
+
+// A copy of the launchd plist template from github.com/kardianos/service
+// with added .Config.Option.ExitTimeOut option
+const darwinLaunchdConfig = `<?xml version='1.0' encoding='UTF-8'?>
+<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN"
+"http://www.apple.com/DTDs/PropertyList-1.0.dtd" >
+<plist version='1.0'>
+  <dict>
+    <key>Label</key>
+    <string>{{html .Name}}</string>
+    <key>ProgramArguments</key>
+    <array>
+      <string>{{html .Path}}</string>
+    {{range .Config.Arguments}}
+      <string>{{html .}}</string>
+    {{end}}
+    </array>
+    {{if .UserName}}<key>UserName</key>
+    <string>{{html .UserName}}</string>{{end}}
+    {{if .ChRoot}}<key>RootDirectory</key>
+    <string>{{html .ChRoot}}</string>{{end}}
+    {{if .Config.Option.ExitTimeOut}}<key>ExitTimeOut</key>
+    <integer>{{html .Config.Option.ExitTimeOut}}</integer>{{end}}
+    {{if .WorkingDirectory}}<key>WorkingDirectory</key>
+    <string>{{html .WorkingDirectory}}</string>{{end}}
+    <key>SessionCreate</key>
+    <{{bool .SessionCreate}}/>
+    <key>KeepAlive</key>
+    <{{bool .KeepAlive}}/>
+    <key>RunAtLoad</key>
+    <{{bool .RunAtLoad}}/>
+    <key>Disabled</key>
+    <false/>
+
+    <key>StandardOutPath</key>
+    <string>/usr/local/var/log/{{html .Name}}.out.log</string>
+    <key>StandardErrorPath</key>
+    <string>/usr/local/var/log/{{html .Name}}.err.log</string>
+
+  </dict>
+</plist>
+`